2008-05-12 12:20:42 -07:00
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#ifndef _LINUX_KERNEL_TRACE_H
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#define _LINUX_KERNEL_TRACE_H
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#include <linux/fs.h>
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#include <asm/atomic.h>
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#include <linux/sched.h>
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#include <linux/clocksource.h>
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2008-09-29 20:02:41 -07:00
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#include <linux/ring_buffer.h>
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ftrace: mmiotrace, updates
here is a patch that makes mmiotrace work almost well within the tracing
framework. The patch applies on top of my previous patch. I have my own
output formatting in place now.
Summary of changes:
- fix the NULL dereference that was due to not calling tracing_reset()
- add print_line() callback into struct tracer
- implement print_line() for mmiotrace, producing up-to-spec text
- add my output header, but that is not really called in the right place
- rewrote the main structs in mmiotrace
- added two new trace entry types: TRACE_MMIO_RW and TRACE_MMIO_MAP
- made some functions in trace.c non-static
- check current==NULL in tracing_generic_entry_update()
- fix(?) comparison in trace_seq_printf()
Things seem to work fine except a few issues. Markers (text lines injected
into mmiotrace log) are missing, I did not feel hacking them in before we
have variable length entries. My output header is printed only for 'trace'
file, but not 'trace_pipe'. For some reason, despite my quick fix,
iter->trace is NULL in print_trace_line() when called from 'trace_pipe'
file, which means I don't get proper output formatting.
I only tried by loading nouveau.ko, which just detects the card, and that
is traced fine. I didn't try further. Map, two reads and unmap. Works
perfectly.
I am missing the information about overflows, I'd prefer to have a
counter for lost events. I didn't try, but I guess currently there is no
way of knowning when it overflows?
So, not too far from being fully operational, it seems :-)
And looking at the diffstat, there also is some 700-900 lines of user space
code that just became obsolete.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-05-12 12:20:57 -07:00
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#include <linux/mmiotrace.h>
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2008-09-23 03:32:08 -07:00
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#include <linux/ftrace.h>
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2008-11-11 15:21:31 -07:00
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#include <trace/boot.h>
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2009-04-09 23:26:18 -07:00
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#include <linux/kmemtrace.h>
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2009-02-07 14:16:12 -07:00
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#include <trace/power.h>
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2008-05-12 12:20:42 -07:00
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tracing: make trace_seq operations available for core kernel
In the process to make TRACE_EVENT macro work for modules, the trace_seq
operations must be available for core kernel code.
These operations are quite useful and can be used for other implementations.
The main idea is that we create a trace_seq handle that acts very much
like the seq_file handle.
struct trace_seq *s = kmalloc(sizeof(*s, GFP_KERNEL);
trace_seq_init(s);
trace_seq_printf(s, "some data %d\n", variable);
printk("%s", s->buffer);
The main use is to allow a top level function call several other functions
that may store printf like data into the buffer. Then at the end, the top
level function can process all the data with any method it would like to.
It could be passed to userspace, output via printk or even use seq_file:
trace_seq_to_user(s, ubuf, cnt);
seq_puts(m, s->buffer);
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2009-04-11 09:59:57 -07:00
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#include <linux/trace_seq.h>
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2009-04-13 08:20:49 -07:00
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#include <linux/ftrace_event.h>
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tracing: make trace_seq operations available for core kernel
In the process to make TRACE_EVENT macro work for modules, the trace_seq
operations must be available for core kernel code.
These operations are quite useful and can be used for other implementations.
The main idea is that we create a trace_seq handle that acts very much
like the seq_file handle.
struct trace_seq *s = kmalloc(sizeof(*s, GFP_KERNEL);
trace_seq_init(s);
trace_seq_printf(s, "some data %d\n", variable);
printk("%s", s->buffer);
The main use is to allow a top level function call several other functions
that may store printf like data into the buffer. Then at the end, the top
level function can process all the data with any method it would like to.
It could be passed to userspace, output via printk or even use seq_file:
trace_seq_to_user(s, ubuf, cnt);
seq_puts(m, s->buffer);
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2009-04-11 09:59:57 -07:00
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2008-05-23 12:37:28 -07:00
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enum trace_type {
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__TRACE_FIRST_TYPE = 0,
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TRACE_FN,
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TRACE_CTX,
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TRACE_WAKE,
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TRACE_STACK,
|
2008-08-01 09:26:41 -07:00
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TRACE_PRINT,
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2009-03-12 10:24:49 -07:00
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TRACE_BPRINT,
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2008-05-23 12:37:28 -07:00
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TRACE_SPECIAL,
|
ftrace: mmiotrace, updates
here is a patch that makes mmiotrace work almost well within the tracing
framework. The patch applies on top of my previous patch. I have my own
output formatting in place now.
Summary of changes:
- fix the NULL dereference that was due to not calling tracing_reset()
- add print_line() callback into struct tracer
- implement print_line() for mmiotrace, producing up-to-spec text
- add my output header, but that is not really called in the right place
- rewrote the main structs in mmiotrace
- added two new trace entry types: TRACE_MMIO_RW and TRACE_MMIO_MAP
- made some functions in trace.c non-static
- check current==NULL in tracing_generic_entry_update()
- fix(?) comparison in trace_seq_printf()
Things seem to work fine except a few issues. Markers (text lines injected
into mmiotrace log) are missing, I did not feel hacking them in before we
have variable length entries. My output header is printed only for 'trace'
file, but not 'trace_pipe'. For some reason, despite my quick fix,
iter->trace is NULL in print_trace_line() when called from 'trace_pipe'
file, which means I don't get proper output formatting.
I only tried by loading nouveau.ko, which just detects the card, and that
is traced fine. I didn't try further. Map, two reads and unmap. Works
perfectly.
I am missing the information about overflows, I'd prefer to have a
counter for lost events. I didn't try, but I guess currently there is no
way of knowning when it overflows?
So, not too far from being fully operational, it seems :-)
And looking at the diffstat, there also is some 700-900 lines of user space
code that just became obsolete.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-05-12 12:20:57 -07:00
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TRACE_MMIO_RW,
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TRACE_MMIO_MAP,
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2008-11-12 13:24:24 -07:00
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TRACE_BRANCH,
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2008-11-11 15:24:42 -07:00
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TRACE_BOOT_CALL,
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TRACE_BOOT_RET,
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2008-11-25 16:57:25 -07:00
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TRACE_GRAPH_RET,
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TRACE_GRAPH_ENT,
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2008-11-22 04:28:47 -07:00
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TRACE_USER_STACK,
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2008-12-11 05:53:26 -07:00
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TRACE_HW_BRANCHES,
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2008-12-29 14:42:23 -07:00
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TRACE_KMEM_ALLOC,
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TRACE_KMEM_FREE,
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2008-11-23 17:49:58 -07:00
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TRACE_POWER,
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blktrace: add ftrace plugin
Impact: New way of using the blktrace infrastructure
This drops the requirement of userspace utilities to use the blktrace
facility.
Configuration is done thru sysfs, adding a "trace" directory to the
partition directory where blktrace can be enabled for the associated
request_queue.
The same filters present in the IOCTL interface are present as sysfs
device attributes.
The /sys/block/sdX/sdXN/trace/enable file allows tracing without any
filters.
The other files in this directory: pid, act_mask, start_lba and end_lba
can be used with the same meaning as with the IOCTL interface.
Using the sysfs interface will only setup the request_queue->blk_trace
fields, tracing will only take place when the "blk" tracer is selected
via the ftrace interface, as in the following example:
To see the trace, one can use the /d/tracing/trace file or the
/d/tracign/trace_pipe file, with semantics defined in the ftrace
documentation in Documentation/ftrace.txt.
[root@f10-1 ~]# cat /t/trace
kjournald-305 [000] 3046.491224: 8,1 A WBS 6367 + 8 <- (8,1) 6304
kjournald-305 [000] 3046.491227: 8,1 Q R 6367 + 8 [kjournald]
kjournald-305 [000] 3046.491236: 8,1 G RB 6367 + 8 [kjournald]
kjournald-305 [000] 3046.491239: 8,1 P NS [kjournald]
kjournald-305 [000] 3046.491242: 8,1 I RBS 6367 + 8 [kjournald]
kjournald-305 [000] 3046.491251: 8,1 D WB 6367 + 8 [kjournald]
kjournald-305 [000] 3046.491610: 8,1 U WS [kjournald] 1
<idle>-0 [000] 3046.511914: 8,1 C RS 6367 + 8 [6367]
[root@f10-1 ~]#
The default line context (prefix) format is the one described in the ftrace
documentation, with the blktrace specific bits using its existing format,
described in blkparse(8).
If one wants to have the classic blktrace formatting, this is possible by
using:
[root@f10-1 ~]# echo blk_classic > /t/trace_options
[root@f10-1 ~]# cat /t/trace
8,1 0 3046.491224 305 A WBS 6367 + 8 <- (8,1) 6304
8,1 0 3046.491227 305 Q R 6367 + 8 [kjournald]
8,1 0 3046.491236 305 G RB 6367 + 8 [kjournald]
8,1 0 3046.491239 305 P NS [kjournald]
8,1 0 3046.491242 305 I RBS 6367 + 8 [kjournald]
8,1 0 3046.491251 305 D WB 6367 + 8 [kjournald]
8,1 0 3046.491610 305 U WS [kjournald] 1
8,1 0 3046.511914 0 C RS 6367 + 8 [6367]
[root@f10-1 ~]#
Using the ftrace standard format allows more flexibility, such
as the ability of asking for backtraces via trace_options:
[root@f10-1 ~]# echo noblk_classic > /t/trace_options
[root@f10-1 ~]# echo stacktrace > /t/trace_options
[root@f10-1 ~]# cat /t/trace
kjournald-305 [000] 3318.826779: 8,1 A WBS 6375 + 8 <- (8,1) 6312
kjournald-305 [000] 3318.826782:
<= submit_bio
<= submit_bh
<= sync_dirty_buffer
<= journal_commit_transaction
<= kjournald
<= kthread
<= child_rip
kjournald-305 [000] 3318.826836: 8,1 Q R 6375 + 8 [kjournald]
kjournald-305 [000] 3318.826837:
<= generic_make_request
<= submit_bio
<= submit_bh
<= sync_dirty_buffer
<= journal_commit_transaction
<= kjournald
<= kthread
Please read the ftrace documentation to use aditional, standardized
tracing filters such as /d/tracing/trace_cpumask, etc.
See also /d/tracing/trace_mark to add comments in the trace stream,
that is equivalent to the /d/block/sdaN/msg interface.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-01-23 07:06:27 -07:00
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TRACE_BLK,
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2008-05-23 12:37:28 -07:00
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2008-12-23 21:24:12 -07:00
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__TRACE_LAST_TYPE,
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2008-05-23 12:37:28 -07:00
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};
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2009-09-12 16:17:15 -07:00
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enum kmemtrace_type_id {
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KMEMTRACE_TYPE_KMALLOC = 0, /* kmalloc() or kfree(). */
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KMEMTRACE_TYPE_CACHE, /* kmem_cache_*(). */
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KMEMTRACE_TYPE_PAGES, /* __get_free_pages() and friends. */
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2008-11-25 16:57:25 -07:00
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};
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2008-09-23 03:32:08 -07:00
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extern struct tracer boot_tracer;
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2008-05-12 12:20:42 -07:00
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2009-09-12 16:17:15 -07:00
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#undef __field
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#define __field(type, item) type item;
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2009-03-12 10:24:49 -07:00
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2009-09-12 16:17:15 -07:00
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#undef __array
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#define __array(type, item, size) type item[size];
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2008-09-29 20:02:42 -07:00
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2009-09-12 16:17:15 -07:00
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#undef __dynamic_array
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#define __dynamic_array(type, item) type item[];
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2008-09-29 20:02:42 -07:00
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2009-09-12 16:17:15 -07:00
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#undef F_STRUCT
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#define F_STRUCT(args...) args
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2008-11-11 15:24:42 -07:00
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2009-09-12 16:17:15 -07:00
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#undef FTRACE_ENTRY
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#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
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struct struct_name { \
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struct trace_entry ent; \
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tstruct \
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}
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2008-09-29 20:02:42 -07:00
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2009-09-12 16:17:15 -07:00
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#undef TP_ARGS
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#define TP_ARGS(args...) args
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2008-11-11 22:14:40 -07:00
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2009-09-12 16:17:15 -07:00
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#undef FTRACE_ENTRY_DUP
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#define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
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2008-11-25 01:24:15 -07:00
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2009-09-12 16:17:15 -07:00
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#include "trace_entries.h"
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2008-12-29 14:42:23 -07:00
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2009-09-12 16:17:15 -07:00
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/*
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* syscalls are special, and need special handling, this is why
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* they are not included in trace_entries.h
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*/
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2009-03-13 07:42:11 -07:00
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struct syscall_trace_enter {
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struct trace_entry ent;
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int nr;
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unsigned long args[];
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};
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struct syscall_trace_exit {
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struct trace_entry ent;
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int nr;
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unsigned long ret;
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};
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2008-09-16 12:02:27 -07:00
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/*
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* trace_flag_type is an enumeration that holds different
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* states when a trace occurs. These are:
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2008-10-24 06:42:59 -07:00
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* IRQS_OFF - interrupts were disabled
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2009-03-06 09:52:03 -07:00
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* IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
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2009-09-09 18:34:19 -07:00
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* NEED_RESCHED - reschedule is requested
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2008-10-24 06:42:59 -07:00
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* HARDIRQ - inside an interrupt handler
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* SOFTIRQ - inside a softirq handler
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2008-09-16 12:02:27 -07:00
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*/
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enum trace_flag_type {
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TRACE_FLAG_IRQS_OFF = 0x01,
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2008-10-24 06:42:59 -07:00
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TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
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TRACE_FLAG_NEED_RESCHED = 0x04,
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TRACE_FLAG_HARDIRQ = 0x08,
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TRACE_FLAG_SOFTIRQ = 0x10,
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2008-09-16 12:02:27 -07:00
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};
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2008-09-16 12:06:42 -07:00
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#define TRACE_BUF_SIZE 1024
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2008-05-12 12:20:42 -07:00
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/*
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* The CPU trace array - it consists of thousands of trace entries
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* plus some other descriptor data: (for example which task started
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* the trace, etc.)
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*/
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struct trace_array_cpu {
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atomic_t disabled;
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2008-12-01 20:20:19 -07:00
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void *buffer_page; /* ring buffer spare */
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2008-05-12 12:20:45 -07:00
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2008-05-12 12:20:42 -07:00
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unsigned long saved_latency;
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unsigned long critical_start;
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unsigned long critical_end;
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unsigned long critical_sequence;
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unsigned long nice;
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unsigned long policy;
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unsigned long rt_priority;
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2009-09-01 08:06:29 -07:00
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unsigned long skipped_entries;
|
2008-05-12 12:20:42 -07:00
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cycle_t preempt_timestamp;
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pid_t pid;
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uid_t uid;
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char comm[TASK_COMM_LEN];
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};
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/*
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* The trace array - an array of per-CPU trace arrays. This is the
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* highest level data structure that individual tracers deal with.
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* They have on/off state as well:
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*/
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struct trace_array {
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2008-09-29 20:02:41 -07:00
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struct ring_buffer *buffer;
|
2008-05-12 12:20:42 -07:00
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unsigned long entries;
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int cpu;
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cycle_t time_start;
|
2008-05-12 12:20:46 -07:00
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struct task_struct *waiter;
|
2008-05-12 12:20:42 -07:00
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struct trace_array_cpu *data[NR_CPUS];
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};
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2008-10-01 07:52:51 -07:00
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#define FTRACE_CMP_TYPE(var, type) \
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__builtin_types_compatible_p(typeof(var), type *)
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#undef IF_ASSIGN
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#define IF_ASSIGN(var, entry, etype, id) \
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if (FTRACE_CMP_TYPE(var, etype)) { \
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var = (typeof(var))(entry); \
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WARN_ON(id && (entry)->type != id); \
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break; \
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}
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/* Will cause compile errors if type is not found. */
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extern void __ftrace_bad_type(void);
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/*
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* The trace_assign_type is a verifier that the entry type is
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* the same as the type being assigned. To add new types simply
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* add a line with the following format:
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*
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* IF_ASSIGN(var, ent, type, id);
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*
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* Where "type" is the trace type that includes the trace_entry
|
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* as the "ent" item. And "id" is the trace identifier that is
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* used in the trace_type enum.
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*
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* If the type can have more than one id, then use zero.
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*/
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#define trace_assign_type(var, ent) \
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do { \
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IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
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IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
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IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
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2008-11-22 04:28:47 -07:00
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IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
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2008-10-01 07:52:51 -07:00
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IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
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2009-03-12 10:24:49 -07:00
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IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
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2008-10-01 07:52:51 -07:00
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IF_ASSIGN(var, ent, struct special_entry, 0); \
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IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
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TRACE_MMIO_RW); \
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|
IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
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|
|
TRACE_MMIO_MAP); \
|
2008-11-11 15:24:42 -07:00
|
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|
IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\
|
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|
IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\
|
2008-11-12 13:24:24 -07:00
|
|
|
IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
|
2008-11-25 16:57:25 -07:00
|
|
|
IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
|
|
|
|
TRACE_GRAPH_ENT); \
|
|
|
|
IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
|
|
|
|
TRACE_GRAPH_RET); \
|
2008-12-11 05:53:26 -07:00
|
|
|
IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\
|
2009-03-06 09:52:03 -07:00
|
|
|
IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \
|
2008-12-29 14:42:23 -07:00
|
|
|
IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry, \
|
|
|
|
TRACE_KMEM_ALLOC); \
|
|
|
|
IF_ASSIGN(var, ent, struct kmemtrace_free_entry, \
|
|
|
|
TRACE_KMEM_FREE); \
|
2008-10-01 07:52:51 -07:00
|
|
|
__ftrace_bad_type(); \
|
|
|
|
} while (0)
|
2008-09-29 11:18:34 -07:00
|
|
|
|
2008-11-17 11:23:42 -07:00
|
|
|
/*
|
|
|
|
* An option specific to a tracer. This is a boolean value.
|
|
|
|
* The bit is the bit index that sets its value on the
|
|
|
|
* flags value in struct tracer_flags.
|
|
|
|
*/
|
|
|
|
struct tracer_opt {
|
2009-03-06 09:52:03 -07:00
|
|
|
const char *name; /* Will appear on the trace_options file */
|
|
|
|
u32 bit; /* Mask assigned in val field in tracer_flags */
|
2008-11-17 11:23:42 -07:00
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The set of specific options for a tracer. Your tracer
|
|
|
|
* have to set the initial value of the flags val.
|
|
|
|
*/
|
|
|
|
struct tracer_flags {
|
|
|
|
u32 val;
|
2009-03-06 09:52:03 -07:00
|
|
|
struct tracer_opt *opts;
|
2008-11-17 11:23:42 -07:00
|
|
|
};
|
|
|
|
|
|
|
|
/* Makes more easy to define a tracer opt */
|
|
|
|
#define TRACER_OPT(s, b) .name = #s, .bit = b
|
|
|
|
|
2009-01-08 11:03:56 -07:00
|
|
|
|
2009-02-10 18:25:00 -07:00
|
|
|
/**
|
|
|
|
* struct tracer - a specific tracer and its callbacks to interact with debugfs
|
|
|
|
* @name: the name chosen to select it on the available_tracers file
|
|
|
|
* @init: called when one switches to this tracer (echo name > current_tracer)
|
|
|
|
* @reset: called when one switches to another tracer
|
|
|
|
* @start: called when tracing is unpaused (echo 1 > tracing_enabled)
|
|
|
|
* @stop: called when tracing is paused (echo 0 > tracing_enabled)
|
|
|
|
* @open: called when the trace file is opened
|
|
|
|
* @pipe_open: called when the trace_pipe file is opened
|
|
|
|
* @wait_pipe: override how the user waits for traces on trace_pipe
|
|
|
|
* @close: called when the trace file is released
|
|
|
|
* @read: override the default read callback on trace_pipe
|
|
|
|
* @splice_read: override the default splice_read callback on trace_pipe
|
|
|
|
* @selftest: selftest to run on boot (see trace_selftest.c)
|
|
|
|
* @print_headers: override the first lines that describe your columns
|
|
|
|
* @print_line: callback that prints a trace
|
|
|
|
* @set_flag: signals one of your private flags changed (trace_options file)
|
|
|
|
* @flags: your private flags
|
2008-05-12 12:20:42 -07:00
|
|
|
*/
|
|
|
|
struct tracer {
|
|
|
|
const char *name;
|
2008-11-15 21:57:26 -07:00
|
|
|
int (*init)(struct trace_array *tr);
|
2008-05-12 12:20:42 -07:00
|
|
|
void (*reset)(struct trace_array *tr);
|
ftrace: restructure tracing start/stop infrastructure
Impact: change where tracing is started up and stopped
Currently, when a new tracer is selected via echo'ing a tracer name into
the current_tracer file, the startup is only done if tracing_enabled is
set to one. If tracing_enabled is changed to zero (by echo'ing 0 into
the tracing_enabled file) a full shutdown is performed.
The full startup and shutdown of a tracer can be expensive and the
user can lose out traces when echo'ing in 0 to the tracing_enabled file,
because the process takes too long. There can also be places that
the user would like to start and stop the tracer several times and
doing the full startup and shutdown of a tracer might be too expensive.
This patch performs the full startup and shutdown when a tracer is
selected. It also adds a way to do a quick start or stop of a tracer.
The quick version is just a flag that prevents the tracing from
taking place, but the overhead of the code is still there.
For example, the startup of a tracer may enable tracepoints, or enable
the function tracer. The stop and start will just set a flag to
have the tracer ignore the calls when the tracepoint or function trace
is called. The overhead of the tracer may still be present when
the tracer is stopped, but no tracing will occur. Setting the tracer
to the 'nop' tracer (or any other tracer) will perform the shutdown
of the tracer which will disable the tracepoint or disable the
function tracer.
The tracing_enabled file will simply start or stop tracing.
This change is all internal. The end result for the user should be the same
as before. If tracing_enabled is not set, no trace will happen.
If tracing_enabled is set, then the trace will happen. The tracing_enabled
variable is static between tracers. Enabling tracing_enabled and
going to another tracer will keep tracing_enabled enabled. Same
is true with disabling tracing_enabled.
This patch will now provide a fast start/stop method to the users
for enabling or disabling tracing.
Note: There were two methods to the struct tracer that were never
used: The methods start and stop. These were to be used as a hook
to the reading of the trace output, but ended up not being
necessary. These two methods are now used to enable the start
and stop of each tracer, in case the tracer needs to do more than
just not write into the buffer. For example, the irqsoff tracer
must stop recording max latencies when tracing is stopped.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-11-05 14:05:44 -07:00
|
|
|
void (*start)(struct trace_array *tr);
|
|
|
|
void (*stop)(struct trace_array *tr);
|
2008-05-12 12:20:42 -07:00
|
|
|
void (*open)(struct trace_iterator *iter);
|
2008-05-12 12:21:01 -07:00
|
|
|
void (*pipe_open)(struct trace_iterator *iter);
|
2009-02-10 18:25:00 -07:00
|
|
|
void (*wait_pipe)(struct trace_iterator *iter);
|
2008-05-12 12:20:42 -07:00
|
|
|
void (*close)(struct trace_iterator *iter);
|
2008-05-12 12:21:01 -07:00
|
|
|
ssize_t (*read)(struct trace_iterator *iter,
|
|
|
|
struct file *filp, char __user *ubuf,
|
|
|
|
size_t cnt, loff_t *ppos);
|
2009-02-08 23:15:56 -07:00
|
|
|
ssize_t (*splice_read)(struct trace_iterator *iter,
|
|
|
|
struct file *filp,
|
|
|
|
loff_t *ppos,
|
|
|
|
struct pipe_inode_info *pipe,
|
|
|
|
size_t len,
|
|
|
|
unsigned int flags);
|
2008-05-12 12:20:44 -07:00
|
|
|
#ifdef CONFIG_FTRACE_STARTUP_TEST
|
|
|
|
int (*selftest)(struct tracer *trace,
|
|
|
|
struct trace_array *tr);
|
|
|
|
#endif
|
2008-11-25 01:12:31 -07:00
|
|
|
void (*print_header)(struct seq_file *m);
|
2008-09-29 11:18:34 -07:00
|
|
|
enum print_line_t (*print_line)(struct trace_iterator *iter);
|
2008-11-17 11:23:42 -07:00
|
|
|
/* If you handled the flag setting, return 0 */
|
|
|
|
int (*set_flag)(u32 old_flags, u32 bit, int set);
|
2008-05-12 12:20:42 -07:00
|
|
|
struct tracer *next;
|
|
|
|
int print_max;
|
2009-03-06 09:52:03 -07:00
|
|
|
struct tracer_flags *flags;
|
2008-05-12 12:20:42 -07:00
|
|
|
};
|
|
|
|
|
2009-03-02 12:04:40 -07:00
|
|
|
|
tracing/core: introduce per cpu tracing files
Impact: split up tracing output per cpu
Currently, on the tracing debugfs directory, three files are
available to the user to let him extracting the trace output:
- trace is an iterator through the ring-buffer. It's a reader
but not a consumer It doesn't block when no more traces are
available.
- trace pretty similar to the former, except that it adds more
informations such as prempt count, irq flag, ...
- trace_pipe is a reader and a consumer, it will also block
waiting for traces if necessary (heh, yes it's a pipe).
The traces coming from different cpus are curretly mixed up
inside these files. Sometimes it messes up the informations,
sometimes it's useful, depending on what does the tracer
capture.
The tracing_cpumask file is useful to filter the output and
select only the traces captured a custom defined set of cpus.
But still it is not enough powerful to extract at the same time
one trace buffer per cpu.
So this patch creates a new directory: /debug/tracing/per_cpu/.
Inside this directory, you will now find one trace_pipe file and
one trace file per cpu.
Which means if you have two cpus, you will have:
trace0
trace1
trace_pipe0
trace_pipe1
And of course, reading these files will have the same effect
than with the usual tracing files, except that you will only see
the traces from the given cpu.
The original all-in-one cpu trace file are still available on
their original place.
Until now, only one consumer was allowed on trace_pipe to avoid
racy consuming on the ring-buffer. Now the approach changed a
bit, you can have only one consumer per cpu.
Which means you are allowed to read concurrently trace_pipe0 and
trace_pipe1 But you can't have two readers on trace_pipe0 or
trace_pipe1.
Following the same logic, if there is one reader on the common
trace_pipe, you can not have at the same time another reader on
trace_pipe0 or in trace_pipe1. Because in trace_pipe is already
a consumer in all cpu buffers in essence.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-24 19:22:28 -07:00
|
|
|
#define TRACE_PIPE_ALL_CPU -1
|
|
|
|
|
2009-02-05 13:02:00 -07:00
|
|
|
int tracer_init(struct tracer *t, struct trace_array *tr);
|
ftrace: restructure tracing start/stop infrastructure
Impact: change where tracing is started up and stopped
Currently, when a new tracer is selected via echo'ing a tracer name into
the current_tracer file, the startup is only done if tracing_enabled is
set to one. If tracing_enabled is changed to zero (by echo'ing 0 into
the tracing_enabled file) a full shutdown is performed.
The full startup and shutdown of a tracer can be expensive and the
user can lose out traces when echo'ing in 0 to the tracing_enabled file,
because the process takes too long. There can also be places that
the user would like to start and stop the tracer several times and
doing the full startup and shutdown of a tracer might be too expensive.
This patch performs the full startup and shutdown when a tracer is
selected. It also adds a way to do a quick start or stop of a tracer.
The quick version is just a flag that prevents the tracing from
taking place, but the overhead of the code is still there.
For example, the startup of a tracer may enable tracepoints, or enable
the function tracer. The stop and start will just set a flag to
have the tracer ignore the calls when the tracepoint or function trace
is called. The overhead of the tracer may still be present when
the tracer is stopped, but no tracing will occur. Setting the tracer
to the 'nop' tracer (or any other tracer) will perform the shutdown
of the tracer which will disable the tracepoint or disable the
function tracer.
The tracing_enabled file will simply start or stop tracing.
This change is all internal. The end result for the user should be the same
as before. If tracing_enabled is not set, no trace will happen.
If tracing_enabled is set, then the trace will happen. The tracing_enabled
variable is static between tracers. Enabling tracing_enabled and
going to another tracer will keep tracing_enabled enabled. Same
is true with disabling tracing_enabled.
This patch will now provide a fast start/stop method to the users
for enabling or disabling tracing.
Note: There were two methods to the struct tracer that were never
used: The methods start and stop. These were to be used as a hook
to the reading of the trace output, but ended up not being
necessary. These two methods are now used to enable the start
and stop of each tracer, in case the tracer needs to do more than
just not write into the buffer. For example, the irqsoff tracer
must stop recording max latencies when tracing is stopped.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-11-05 14:05:44 -07:00
|
|
|
int tracing_is_enabled(void);
|
2008-09-16 11:56:41 -07:00
|
|
|
void trace_wake_up(void);
|
2008-09-29 20:02:41 -07:00
|
|
|
void tracing_reset(struct trace_array *tr, int cpu);
|
2008-12-19 03:08:39 -07:00
|
|
|
void tracing_reset_online_cpus(struct trace_array *tr);
|
2009-05-06 18:54:09 -07:00
|
|
|
void tracing_reset_current(int cpu);
|
|
|
|
void tracing_reset_current_online_cpus(void);
|
2008-05-12 12:20:42 -07:00
|
|
|
int tracing_open_generic(struct inode *inode, struct file *filp);
|
2009-03-26 16:25:38 -07:00
|
|
|
struct dentry *trace_create_file(const char *name,
|
|
|
|
mode_t mode,
|
|
|
|
struct dentry *parent,
|
|
|
|
void *data,
|
|
|
|
const struct file_operations *fops);
|
|
|
|
|
2008-05-12 12:20:42 -07:00
|
|
|
struct dentry *tracing_init_dentry(void);
|
2008-05-12 12:20:49 -07:00
|
|
|
void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
|
|
|
|
|
tracing: Introduce trace_buffer_{lock_reserve,unlock_commit}
Impact: new API
These new functions do what previously was being open coded, reducing
the number of details ftrace plugin writers have to worry about.
It also standardizes the handling of stacktrace, userstacktrace and
other trace options we may introduce in the future.
With this patch, for instance, the blk tracer (and some others already
in the tree) can use the "userstacktrace" /d/tracing/trace_options
facility.
$ codiff /tmp/vmlinux.before /tmp/vmlinux.after
linux-2.6-tip/kernel/trace/trace.c:
trace_vprintk | -5
trace_graph_return | -22
trace_graph_entry | -26
trace_function | -45
__ftrace_trace_stack | -27
ftrace_trace_userstack | -29
tracing_sched_switch_trace | -66
tracing_stop | +1
trace_seq_to_user | -1
ftrace_trace_special | -63
ftrace_special | +1
tracing_sched_wakeup_trace | -70
tracing_reset_online_cpus | -1
13 functions changed, 2 bytes added, 355 bytes removed, diff: -353
linux-2.6-tip/block/blktrace.c:
__blk_add_trace | -58
1 function changed, 58 bytes removed, diff: -58
linux-2.6-tip/kernel/trace/trace.c:
trace_buffer_lock_reserve | +88
trace_buffer_unlock_commit | +86
2 functions changed, 174 bytes added, diff: +174
/tmp/vmlinux.after:
16 functions changed, 176 bytes added, 413 bytes removed, diff: -237
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Frédéric Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-05 11:14:13 -07:00
|
|
|
struct ring_buffer_event;
|
|
|
|
|
2009-09-02 11:17:06 -07:00
|
|
|
struct ring_buffer_event *
|
|
|
|
trace_buffer_lock_reserve(struct ring_buffer *buffer,
|
|
|
|
int type,
|
|
|
|
unsigned long len,
|
|
|
|
unsigned long flags,
|
|
|
|
int pc);
|
|
|
|
void trace_buffer_unlock_commit(struct ring_buffer *buffer,
|
tracing: Introduce trace_buffer_{lock_reserve,unlock_commit}
Impact: new API
These new functions do what previously was being open coded, reducing
the number of details ftrace plugin writers have to worry about.
It also standardizes the handling of stacktrace, userstacktrace and
other trace options we may introduce in the future.
With this patch, for instance, the blk tracer (and some others already
in the tree) can use the "userstacktrace" /d/tracing/trace_options
facility.
$ codiff /tmp/vmlinux.before /tmp/vmlinux.after
linux-2.6-tip/kernel/trace/trace.c:
trace_vprintk | -5
trace_graph_return | -22
trace_graph_entry | -26
trace_function | -45
__ftrace_trace_stack | -27
ftrace_trace_userstack | -29
tracing_sched_switch_trace | -66
tracing_stop | +1
trace_seq_to_user | -1
ftrace_trace_special | -63
ftrace_special | +1
tracing_sched_wakeup_trace | -70
tracing_reset_online_cpus | -1
13 functions changed, 2 bytes added, 355 bytes removed, diff: -353
linux-2.6-tip/block/blktrace.c:
__blk_add_trace | -58
1 function changed, 58 bytes removed, diff: -58
linux-2.6-tip/kernel/trace/trace.c:
trace_buffer_lock_reserve | +88
trace_buffer_unlock_commit | +86
2 functions changed, 174 bytes added, diff: +174
/tmp/vmlinux.after:
16 functions changed, 176 bytes added, 413 bytes removed, diff: -237
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Frédéric Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-05 11:14:13 -07:00
|
|
|
struct ring_buffer_event *event,
|
|
|
|
unsigned long flags, int pc);
|
|
|
|
|
2008-09-16 11:56:41 -07:00
|
|
|
struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
|
|
|
|
struct trace_array_cpu *data);
|
2009-02-02 15:29:21 -07:00
|
|
|
|
|
|
|
struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
|
|
|
|
int *ent_cpu, u64 *ent_ts);
|
|
|
|
|
2009-02-10 18:25:00 -07:00
|
|
|
void default_wait_pipe(struct trace_iterator *iter);
|
|
|
|
void poll_wait_pipe(struct trace_iterator *iter);
|
|
|
|
|
2008-05-12 12:20:42 -07:00
|
|
|
void ftrace(struct trace_array *tr,
|
|
|
|
struct trace_array_cpu *data,
|
|
|
|
unsigned long ip,
|
|
|
|
unsigned long parent_ip,
|
2008-10-01 10:14:09 -07:00
|
|
|
unsigned long flags, int pc);
|
2008-05-12 12:20:42 -07:00
|
|
|
void tracing_sched_switch_trace(struct trace_array *tr,
|
|
|
|
struct task_struct *prev,
|
|
|
|
struct task_struct *next,
|
2008-10-01 10:14:09 -07:00
|
|
|
unsigned long flags, int pc);
|
2008-05-12 12:20:51 -07:00
|
|
|
|
|
|
|
void tracing_sched_wakeup_trace(struct trace_array *tr,
|
|
|
|
struct task_struct *wakee,
|
|
|
|
struct task_struct *cur,
|
2008-10-01 10:14:09 -07:00
|
|
|
unsigned long flags, int pc);
|
2008-05-12 12:20:47 -07:00
|
|
|
void trace_special(struct trace_array *tr,
|
|
|
|
struct trace_array_cpu *data,
|
|
|
|
unsigned long arg1,
|
|
|
|
unsigned long arg2,
|
2008-10-01 10:14:09 -07:00
|
|
|
unsigned long arg3, int pc);
|
2008-05-12 12:20:49 -07:00
|
|
|
void trace_function(struct trace_array *tr,
|
|
|
|
unsigned long ip,
|
|
|
|
unsigned long parent_ip,
|
2008-10-01 10:14:09 -07:00
|
|
|
unsigned long flags, int pc);
|
2008-05-12 12:20:42 -07:00
|
|
|
|
2008-11-25 16:57:25 -07:00
|
|
|
void trace_graph_return(struct ftrace_graph_ret *trace);
|
2008-12-02 21:50:05 -07:00
|
|
|
int trace_graph_entry(struct ftrace_graph_ent *trace);
|
2009-07-29 09:59:58 -07:00
|
|
|
void set_graph_array(struct trace_array *tr);
|
2008-11-25 01:24:15 -07:00
|
|
|
|
2008-05-22 08:49:22 -07:00
|
|
|
void tracing_start_cmdline_record(void);
|
|
|
|
void tracing_stop_cmdline_record(void);
|
2008-11-07 20:36:02 -07:00
|
|
|
void tracing_sched_switch_assign_trace(struct trace_array *tr);
|
|
|
|
void tracing_stop_sched_switch_record(void);
|
|
|
|
void tracing_start_sched_switch_record(void);
|
2008-05-12 12:20:42 -07:00
|
|
|
int register_tracer(struct tracer *type);
|
|
|
|
void unregister_tracer(struct tracer *type);
|
2009-09-12 16:43:07 -07:00
|
|
|
int is_tracing_stopped(void);
|
2008-05-12 12:20:42 -07:00
|
|
|
|
|
|
|
extern unsigned long nsecs_to_usecs(unsigned long nsecs);
|
|
|
|
|
2009-08-27 13:52:21 -07:00
|
|
|
#ifdef CONFIG_TRACER_MAX_TRACE
|
2008-05-12 12:20:42 -07:00
|
|
|
extern unsigned long tracing_max_latency;
|
|
|
|
extern unsigned long tracing_thresh;
|
|
|
|
|
|
|
|
void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
|
|
|
|
void update_max_tr_single(struct trace_array *tr,
|
|
|
|
struct task_struct *tsk, int cpu);
|
2009-08-27 13:52:21 -07:00
|
|
|
#endif /* CONFIG_TRACER_MAX_TRACE */
|
2008-05-12 12:20:42 -07:00
|
|
|
|
2009-07-29 08:51:13 -07:00
|
|
|
#ifdef CONFIG_STACKTRACE
|
2009-09-02 11:17:06 -07:00
|
|
|
void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
|
2009-07-29 08:51:13 -07:00
|
|
|
int skip, int pc);
|
|
|
|
|
2009-09-02 11:17:06 -07:00
|
|
|
void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
|
2009-07-29 08:51:13 -07:00
|
|
|
int pc);
|
|
|
|
|
|
|
|
void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
|
|
|
|
int pc);
|
|
|
|
#else
|
|
|
|
static inline void ftrace_trace_stack(struct trace_array *tr,
|
|
|
|
unsigned long flags, int skip, int pc)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void ftrace_trace_userstack(struct trace_array *tr,
|
|
|
|
unsigned long flags, int pc)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
|
|
|
|
int skip, int pc)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_STACKTRACE */
|
2009-01-15 17:12:40 -07:00
|
|
|
|
2008-05-12 12:20:51 -07:00
|
|
|
extern cycle_t ftrace_now(int cpu);
|
2008-05-12 12:20:42 -07:00
|
|
|
|
2009-03-16 16:20:15 -07:00
|
|
|
extern void trace_find_cmdline(int pid, char comm[]);
|
2008-12-29 05:02:17 -07:00
|
|
|
|
2008-05-12 12:20:42 -07:00
|
|
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
|
|
extern unsigned long ftrace_update_tot_cnt;
|
2008-05-12 12:20:54 -07:00
|
|
|
#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
|
|
|
|
extern int DYN_FTRACE_TEST_NAME(void);
|
2008-05-12 12:20:42 -07:00
|
|
|
#endif
|
|
|
|
|
2009-06-30 19:47:05 -07:00
|
|
|
extern int ring_buffer_expanded;
|
|
|
|
extern bool tracing_selftest_disabled;
|
2009-07-29 08:11:12 -07:00
|
|
|
DECLARE_PER_CPU(local_t, ftrace_cpu_disabled);
|
2009-06-30 19:47:05 -07:00
|
|
|
|
2008-05-12 12:20:44 -07:00
|
|
|
#ifdef CONFIG_FTRACE_STARTUP_TEST
|
|
|
|
extern int trace_selftest_startup_function(struct tracer *trace,
|
|
|
|
struct trace_array *tr);
|
2009-02-07 13:33:57 -07:00
|
|
|
extern int trace_selftest_startup_function_graph(struct tracer *trace,
|
|
|
|
struct trace_array *tr);
|
2008-05-12 12:20:44 -07:00
|
|
|
extern int trace_selftest_startup_irqsoff(struct tracer *trace,
|
|
|
|
struct trace_array *tr);
|
|
|
|
extern int trace_selftest_startup_preemptoff(struct tracer *trace,
|
|
|
|
struct trace_array *tr);
|
|
|
|
extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
|
|
|
|
struct trace_array *tr);
|
|
|
|
extern int trace_selftest_startup_wakeup(struct tracer *trace,
|
|
|
|
struct trace_array *tr);
|
2008-09-19 03:06:43 -07:00
|
|
|
extern int trace_selftest_startup_nop(struct tracer *trace,
|
|
|
|
struct trace_array *tr);
|
2008-05-12 12:20:44 -07:00
|
|
|
extern int trace_selftest_startup_sched_switch(struct tracer *trace,
|
|
|
|
struct trace_array *tr);
|
2008-05-12 12:20:47 -07:00
|
|
|
extern int trace_selftest_startup_sysprof(struct tracer *trace,
|
|
|
|
struct trace_array *tr);
|
2008-11-12 13:24:24 -07:00
|
|
|
extern int trace_selftest_startup_branch(struct tracer *trace,
|
|
|
|
struct trace_array *tr);
|
2009-03-13 02:50:27 -07:00
|
|
|
extern int trace_selftest_startup_hw_branches(struct tracer *trace,
|
|
|
|
struct trace_array *tr);
|
2008-05-12 12:20:44 -07:00
|
|
|
#endif /* CONFIG_FTRACE_STARTUP_TEST */
|
|
|
|
|
2008-05-12 12:20:45 -07:00
|
|
|
extern void *head_page(struct trace_array_cpu *data);
|
2009-03-29 22:48:00 -07:00
|
|
|
extern unsigned long long ns2usecs(cycle_t nsec);
|
2008-12-03 15:45:11 -07:00
|
|
|
extern int
|
2009-03-19 11:03:53 -07:00
|
|
|
trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
|
2009-03-12 10:24:49 -07:00
|
|
|
extern int
|
2009-03-19 11:03:53 -07:00
|
|
|
trace_vprintk(unsigned long ip, const char *fmt, va_list args);
|
2009-09-03 16:11:07 -07:00
|
|
|
extern int
|
|
|
|
trace_array_vprintk(struct trace_array *tr,
|
|
|
|
unsigned long ip, const char *fmt, va_list args);
|
|
|
|
int trace_array_printk(struct trace_array *tr,
|
|
|
|
unsigned long ip, const char *fmt, ...);
|
2008-05-12 12:20:45 -07:00
|
|
|
|
2008-05-12 12:20:52 -07:00
|
|
|
extern unsigned long trace_flags;
|
|
|
|
|
2009-08-25 01:12:56 -07:00
|
|
|
extern int trace_clock_id;
|
|
|
|
|
2008-11-10 23:14:25 -07:00
|
|
|
/* Standard output formatting function used for function return traces */
|
2008-11-25 13:07:04 -07:00
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
|
|
extern enum print_line_t print_graph_function(struct trace_iterator *iter);
|
2009-03-23 20:12:58 -07:00
|
|
|
extern enum print_line_t
|
|
|
|
trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
|
2008-12-03 13:36:57 -07:00
|
|
|
|
|
|
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
|
|
/* TODO: make this variable */
|
|
|
|
#define FTRACE_GRAPH_MAX_FUNCS 32
|
|
|
|
extern int ftrace_graph_count;
|
|
|
|
extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
|
|
|
|
|
|
|
|
static inline int ftrace_graph_addr(unsigned long addr)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
if (!ftrace_graph_count || test_tsk_trace_graph(current))
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
for (i = 0; i < ftrace_graph_count; i++) {
|
|
|
|
if (addr == ftrace_graph_funcs[i])
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
2008-11-10 23:14:25 -07:00
|
|
|
#else
|
2008-12-03 13:36:57 -07:00
|
|
|
static inline int ftrace_trace_addr(unsigned long addr)
|
|
|
|
{
|
2008-12-04 01:18:28 -07:00
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
static inline int ftrace_graph_addr(unsigned long addr)
|
|
|
|
{
|
|
|
|
return 1;
|
2008-12-03 13:36:57 -07:00
|
|
|
}
|
|
|
|
#endif /* CONFIG_DYNAMIC_FTRACE */
|
|
|
|
#else /* CONFIG_FUNCTION_GRAPH_TRACER */
|
2008-11-10 23:14:25 -07:00
|
|
|
static inline enum print_line_t
|
2008-11-25 13:07:04 -07:00
|
|
|
print_graph_function(struct trace_iterator *iter)
|
2008-11-10 23:14:25 -07:00
|
|
|
{
|
|
|
|
return TRACE_TYPE_UNHANDLED;
|
|
|
|
}
|
2008-12-03 13:36:57 -07:00
|
|
|
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
|
2008-11-10 23:14:25 -07:00
|
|
|
|
2008-12-03 22:26:40 -07:00
|
|
|
extern struct pid *ftrace_pid_trace;
|
2008-12-03 13:36:59 -07:00
|
|
|
|
2009-06-24 22:30:12 -07:00
|
|
|
#ifdef CONFIG_FUNCTION_TRACER
|
2008-12-03 13:36:59 -07:00
|
|
|
static inline int ftrace_trace_task(struct task_struct *task)
|
|
|
|
{
|
2008-12-04 15:49:47 -07:00
|
|
|
if (!ftrace_pid_trace)
|
2008-12-03 13:36:59 -07:00
|
|
|
return 1;
|
|
|
|
|
|
|
|
return test_tsk_trace_trace(task);
|
|
|
|
}
|
2009-06-24 22:30:12 -07:00
|
|
|
#else
|
|
|
|
static inline int ftrace_trace_task(struct task_struct *task)
|
|
|
|
{
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
#endif
|
2008-12-03 13:36:59 -07:00
|
|
|
|
2009-09-11 08:29:27 -07:00
|
|
|
/*
|
|
|
|
* struct trace_parser - servers for reading the user input separated by spaces
|
|
|
|
* @cont: set if the input is not complete - no final space char was found
|
|
|
|
* @buffer: holds the parsed user input
|
|
|
|
* @idx: user input lenght
|
|
|
|
* @size: buffer size
|
|
|
|
*/
|
|
|
|
struct trace_parser {
|
|
|
|
bool cont;
|
|
|
|
char *buffer;
|
|
|
|
unsigned idx;
|
|
|
|
unsigned size;
|
|
|
|
};
|
|
|
|
|
|
|
|
static inline bool trace_parser_loaded(struct trace_parser *parser)
|
|
|
|
{
|
|
|
|
return (parser->idx != 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline bool trace_parser_cont(struct trace_parser *parser)
|
|
|
|
{
|
|
|
|
return parser->cont;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void trace_parser_clear(struct trace_parser *parser)
|
|
|
|
{
|
|
|
|
parser->cont = false;
|
|
|
|
parser->idx = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
extern int trace_parser_get_init(struct trace_parser *parser, int size);
|
|
|
|
extern void trace_parser_put(struct trace_parser *parser);
|
|
|
|
extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
|
|
|
|
size_t cnt, loff_t *ppos);
|
|
|
|
|
2008-05-12 12:21:00 -07:00
|
|
|
/*
|
|
|
|
* trace_iterator_flags is an enumeration that defines bit
|
|
|
|
* positions into trace_flags that controls the output.
|
|
|
|
*
|
|
|
|
* NOTE: These bits must match the trace_options array in
|
|
|
|
* trace.c.
|
|
|
|
*/
|
2008-05-12 12:20:52 -07:00
|
|
|
enum trace_iterator_flags {
|
|
|
|
TRACE_ITER_PRINT_PARENT = 0x01,
|
|
|
|
TRACE_ITER_SYM_OFFSET = 0x02,
|
|
|
|
TRACE_ITER_SYM_ADDR = 0x04,
|
|
|
|
TRACE_ITER_VERBOSE = 0x08,
|
|
|
|
TRACE_ITER_RAW = 0x10,
|
|
|
|
TRACE_ITER_HEX = 0x20,
|
|
|
|
TRACE_ITER_BIN = 0x40,
|
|
|
|
TRACE_ITER_BLOCK = 0x80,
|
|
|
|
TRACE_ITER_STACKTRACE = 0x100,
|
2008-05-12 12:20:52 -07:00
|
|
|
TRACE_ITER_SCHED_TREE = 0x200,
|
2008-09-04 01:24:14 -07:00
|
|
|
TRACE_ITER_PRINTK = 0x400,
|
ftrace: function tracer with irqs disabled
Impact: disable interrupts during trace entry creation (as opposed to preempt)
To help with performance, I set the ftracer to not disable interrupts,
and only to disable preemption. If an interrupt occurred, it would not
be traced, because the function tracer protects itself from recursion.
This may be faster, but the trace output might miss some traces.
This patch makes the fuction trace disable interrupts, but it also
adds a runtime feature to disable preemption instead. It does this by
having two different tracer functions. When the function tracer is
enabled, it will check to see which version is requested (irqs disabled
or preemption disabled). Then it will use the corresponding function
as the tracer.
Irq disabling is the default behaviour, but if the user wants better
performance, with the chance of missing traces, then they can choose
the preempt disabled version.
Running hackbench 3 times with the irqs disabled and 3 times with
the preempt disabled function tracer yielded:
tracing type times entries recorded
------------ -------- ----------------
irq disabled 43.393 166433066
43.282 166172618
43.298 166256704
preempt disabled 38.969 159871710
38.943 159972935
39.325 161056510
Average:
irqs disabled: 43.324 166287462
preempt disabled: 39.079 160300385
preempt is 10.8 percent faster than irqs disabled.
I wrote a patch to count function trace recursion and reran hackbench.
With irq disabled: 1,150 times the function tracer did not trace due to
recursion.
with preempt disabled: 5,117,718 times.
The thousand times with irq disabled could be due to NMIs, or simply a case
where it called a function that was not protected by notrace.
But we also see that a large amount of the trace is lost with the
preempt version.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-11-03 21:15:57 -07:00
|
|
|
TRACE_ITER_PREEMPTONLY = 0x800,
|
2008-11-12 13:24:24 -07:00
|
|
|
TRACE_ITER_BRANCH = 0x1000,
|
2008-11-12 15:52:38 -07:00
|
|
|
TRACE_ITER_ANNOTATE = 0x2000,
|
2008-11-22 04:28:48 -07:00
|
|
|
TRACE_ITER_USERSTACKTRACE = 0x4000,
|
2008-12-13 12:18:13 -07:00
|
|
|
TRACE_ITER_SYM_USEROBJ = 0x8000,
|
2009-02-02 15:29:21 -07:00
|
|
|
TRACE_ITER_PRINTK_MSGONLY = 0x10000,
|
2009-03-04 18:34:24 -07:00
|
|
|
TRACE_ITER_CONTEXT_INFO = 0x20000, /* Print pid/cpu/time */
|
|
|
|
TRACE_ITER_LATENCY_FMT = 0x40000,
|
2009-08-25 01:12:56 -07:00
|
|
|
TRACE_ITER_SLEEP_TIME = 0x80000,
|
|
|
|
TRACE_ITER_GRAPH_TIME = 0x100000,
|
2008-05-12 12:20:52 -07:00
|
|
|
};
|
|
|
|
|
2008-11-10 23:14:25 -07:00
|
|
|
/*
|
|
|
|
* TRACE_ITER_SYM_MASK masks the options in trace_flags that
|
|
|
|
* control the output of kernel symbols.
|
|
|
|
*/
|
|
|
|
#define TRACE_ITER_SYM_MASK \
|
|
|
|
(TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
|
|
|
|
|
2008-09-21 11:16:30 -07:00
|
|
|
extern struct tracer nop_trace;
|
|
|
|
|
2008-11-03 21:15:55 -07:00
|
|
|
/**
|
|
|
|
* ftrace_preempt_disable - disable preemption scheduler safe
|
|
|
|
*
|
|
|
|
* When tracing can happen inside the scheduler, there exists
|
|
|
|
* cases that the tracing might happen before the need_resched
|
|
|
|
* flag is checked. If this happens and the tracer calls
|
|
|
|
* preempt_enable (after a disable), a schedule might take place
|
|
|
|
* causing an infinite recursion.
|
|
|
|
*
|
2009-02-06 02:33:27 -07:00
|
|
|
* To prevent this, we read the need_resched flag before
|
2008-11-03 21:15:55 -07:00
|
|
|
* disabling preemption. When we want to enable preemption we
|
|
|
|
* check the flag, if it is set, then we call preempt_enable_no_resched.
|
|
|
|
* Otherwise, we call preempt_enable.
|
|
|
|
*
|
2009-02-06 02:33:27 -07:00
|
|
|
* The rational for doing the above is that if need_resched is set
|
2008-11-03 21:15:55 -07:00
|
|
|
* and we have yet to reschedule, we are either in an atomic location
|
|
|
|
* (where we do not need to check for scheduling) or we are inside
|
|
|
|
* the scheduler and do not want to resched.
|
|
|
|
*/
|
|
|
|
static inline int ftrace_preempt_disable(void)
|
|
|
|
{
|
|
|
|
int resched;
|
|
|
|
|
|
|
|
resched = need_resched();
|
|
|
|
preempt_disable_notrace();
|
|
|
|
|
|
|
|
return resched;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ftrace_preempt_enable - enable preemption scheduler safe
|
|
|
|
* @resched: the return value from ftrace_preempt_disable
|
|
|
|
*
|
|
|
|
* This is a scheduler safe way to enable preemption and not miss
|
|
|
|
* any preemption checks. The disabled saved the state of preemption.
|
2009-02-06 02:33:27 -07:00
|
|
|
* If resched is set, then we are either inside an atomic or
|
2008-11-03 21:15:55 -07:00
|
|
|
* are inside the scheduler (we would have already scheduled
|
|
|
|
* otherwise). In this case, we do not want to call normal
|
|
|
|
* preempt_enable, but preempt_enable_no_resched instead.
|
|
|
|
*/
|
|
|
|
static inline void ftrace_preempt_enable(int resched)
|
|
|
|
{
|
|
|
|
if (resched)
|
|
|
|
preempt_enable_no_resched_notrace();
|
|
|
|
else
|
|
|
|
preempt_enable_notrace();
|
|
|
|
}
|
|
|
|
|
2008-11-12 13:24:24 -07:00
|
|
|
#ifdef CONFIG_BRANCH_TRACER
|
2008-11-12 13:24:24 -07:00
|
|
|
extern int enable_branch_tracing(struct trace_array *tr);
|
|
|
|
extern void disable_branch_tracing(void);
|
|
|
|
static inline int trace_branch_enable(struct trace_array *tr)
|
2008-11-11 22:14:40 -07:00
|
|
|
{
|
2008-11-12 13:24:24 -07:00
|
|
|
if (trace_flags & TRACE_ITER_BRANCH)
|
|
|
|
return enable_branch_tracing(tr);
|
2008-11-11 22:14:40 -07:00
|
|
|
return 0;
|
|
|
|
}
|
2008-11-12 13:24:24 -07:00
|
|
|
static inline void trace_branch_disable(void)
|
2008-11-11 22:14:40 -07:00
|
|
|
{
|
|
|
|
/* due to races, always disable */
|
2008-11-12 13:24:24 -07:00
|
|
|
disable_branch_tracing();
|
2008-11-11 22:14:40 -07:00
|
|
|
}
|
|
|
|
#else
|
2008-11-12 13:24:24 -07:00
|
|
|
static inline int trace_branch_enable(struct trace_array *tr)
|
2008-11-11 22:14:40 -07:00
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
2008-11-12 13:24:24 -07:00
|
|
|
static inline void trace_branch_disable(void)
|
2008-11-11 22:14:40 -07:00
|
|
|
{
|
|
|
|
}
|
2008-11-12 13:24:24 -07:00
|
|
|
#endif /* CONFIG_BRANCH_TRACER */
|
2008-11-11 22:14:40 -07:00
|
|
|
|
2009-03-11 11:33:00 -07:00
|
|
|
/* set ring buffers to default size if not already done so */
|
|
|
|
int tracing_update_buffers(void);
|
|
|
|
|
2009-02-28 00:41:25 -07:00
|
|
|
/* trace event type bit fields, not numeric */
|
|
|
|
enum {
|
|
|
|
TRACE_EVENT_TYPE_PRINTF = 1,
|
|
|
|
TRACE_EVENT_TYPE_RAW = 2,
|
|
|
|
};
|
|
|
|
|
2009-03-22 01:30:39 -07:00
|
|
|
struct ftrace_event_field {
|
|
|
|
struct list_head link;
|
|
|
|
char *name;
|
|
|
|
char *type;
|
2009-08-06 19:33:02 -07:00
|
|
|
int filter_type;
|
2009-03-22 01:30:39 -07:00
|
|
|
int offset;
|
|
|
|
int size;
|
2009-04-28 01:04:53 -07:00
|
|
|
int is_signed;
|
2009-03-22 01:30:39 -07:00
|
|
|
};
|
|
|
|
|
2009-04-28 01:04:47 -07:00
|
|
|
struct event_filter {
|
|
|
|
int n_preds;
|
|
|
|
struct filter_pred **preds;
|
tracing/filters: a better event parser
Replace the current event parser hack with a better one. Filters are
no longer specified predicate by predicate, but all at once and can
use parens and any of the following operators:
numeric fields:
==, !=, <, <=, >, >=
string fields:
==, !=
predicates can be combined with the logical operators:
&&, ||
examples:
"common_preempt_count > 4" > filter
"((sig >= 10 && sig < 15) || sig == 17) && comm != bash" > filter
If there was an error, the erroneous string along with an error
message can be seen by looking at the filter e.g.:
((sig >= 10 && sig < 15) || dsig == 17) && comm != bash
^
parse_error: Field not found
Currently the caret for an error always appears at the beginning of
the filter; a real position should be used, but the error message
should be useful even without it.
To clear a filter, '0' can be written to the filter file.
Filters can also be set or cleared for a complete subsystem by writing
the same filter as would be written to an individual event to the
filter file at the root of the subsytem. Note however, that if any
event in the subsystem lacks a field specified in the filter being
set, the set will fail and all filters in the subsytem are
automatically cleared. This change from the previous version was made
because using only the fields that happen to exist for a given event
would most likely result in a meaningless filter.
Because the logical operators are now implemented as predicates, the
maximum number of predicates in a filter was increased from 8 to 16.
[ Impact: add new, extended trace-filter implementation ]
Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: fweisbec@gmail.com
Cc: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <1240905899.6416.121.camel@tropicana>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-04-28 01:04:59 -07:00
|
|
|
char *filter_string;
|
2009-07-19 19:20:53 -07:00
|
|
|
bool no_reset;
|
2009-04-28 01:04:47 -07:00
|
|
|
};
|
|
|
|
|
2009-03-22 01:31:17 -07:00
|
|
|
struct event_subsystem {
|
|
|
|
struct list_head list;
|
|
|
|
const char *name;
|
|
|
|
struct dentry *entry;
|
2009-07-19 19:20:53 -07:00
|
|
|
struct event_filter *filter;
|
2009-07-09 01:22:22 -07:00
|
|
|
int nr_events;
|
2009-03-22 01:31:17 -07:00
|
|
|
};
|
|
|
|
|
2009-03-22 01:31:04 -07:00
|
|
|
struct filter_pred;
|
|
|
|
|
tracing/filters: a better event parser
Replace the current event parser hack with a better one. Filters are
no longer specified predicate by predicate, but all at once and can
use parens and any of the following operators:
numeric fields:
==, !=, <, <=, >, >=
string fields:
==, !=
predicates can be combined with the logical operators:
&&, ||
examples:
"common_preempt_count > 4" > filter
"((sig >= 10 && sig < 15) || sig == 17) && comm != bash" > filter
If there was an error, the erroneous string along with an error
message can be seen by looking at the filter e.g.:
((sig >= 10 && sig < 15) || dsig == 17) && comm != bash
^
parse_error: Field not found
Currently the caret for an error always appears at the beginning of
the filter; a real position should be used, but the error message
should be useful even without it.
To clear a filter, '0' can be written to the filter file.
Filters can also be set or cleared for a complete subsystem by writing
the same filter as would be written to an individual event to the
filter file at the root of the subsytem. Note however, that if any
event in the subsystem lacks a field specified in the filter being
set, the set will fail and all filters in the subsytem are
automatically cleared. This change from the previous version was made
because using only the fields that happen to exist for a given event
would most likely result in a meaningless filter.
Because the logical operators are now implemented as predicates, the
maximum number of predicates in a filter was increased from 8 to 16.
[ Impact: add new, extended trace-filter implementation ]
Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: fweisbec@gmail.com
Cc: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <1240905899.6416.121.camel@tropicana>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-04-28 01:04:59 -07:00
|
|
|
typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event,
|
|
|
|
int val1, int val2);
|
2009-03-22 01:31:04 -07:00
|
|
|
|
|
|
|
struct filter_pred {
|
|
|
|
filter_pred_fn_t fn;
|
|
|
|
u64 val;
|
tracing/filters: allow on-the-fly filter switching
This patch allows event filters to be safely removed or switched
on-the-fly while avoiding the use of rcu or the suspension of tracing of
previous versions.
It does it by adding a new filter_pred_none() predicate function which
does nothing and by never deallocating either the predicates or any of
the filter_pred members used in matching; the predicate lists are
allocated and initialized during ftrace_event_calls initialization.
Whenever a filter is removed or replaced, the filter_pred_* functions
currently in use by the affected ftrace_event_call are immediately
switched over to to the filter_pred_none() function, while the rest of
the filter_pred members are left intact, allowing any currently
executing filter_pred_* functions to finish up, using the values they're
currently using.
In the case of filter replacement, the new predicate values are copied
into the old predicates after the above step, and the filter_pred_none()
functions are replaced by the filter_pred_* functions for the new
filter. In this case, it is possible though very unlikely that a
previous filter_pred_* is still running even after the
filter_pred_none() switch and the switch to the new filter_pred_*. In
that case, however, because nothing has been deallocated in the
filter_pred, the worst that can happen is that the old filter_pred_*
function sees the new values and as a result produces either a false
positive or a false negative, depending on the values it finds.
So one downside to this method is that rarely, it can produce a bad
match during the filter switch, but it should be possible to live with
that, IMHO.
The other downside is that at least in this patch the predicate lists
are always pre-allocated, taking up memory from the start. They could
probably be allocated on first-use, and de-allocated when tracing is
completely stopped - if this patch makes sense, I could create another
one to do that later on.
Oh, and it also places a restriction on the size of __arrays in events,
currently set to 128, since they can't be larger than the now embedded
str_val arrays in the filter_pred struct.
Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: paulmck@linux.vnet.ibm.com
LKML-Reference: <1239610670.6660.49.camel@tropicana>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-04-13 01:17:50 -07:00
|
|
|
char str_val[MAX_FILTER_STR_VAL];
|
2009-03-22 01:31:04 -07:00
|
|
|
int str_len;
|
|
|
|
char *field_name;
|
|
|
|
int offset;
|
|
|
|
int not;
|
tracing/filters: a better event parser
Replace the current event parser hack with a better one. Filters are
no longer specified predicate by predicate, but all at once and can
use parens and any of the following operators:
numeric fields:
==, !=, <, <=, >, >=
string fields:
==, !=
predicates can be combined with the logical operators:
&&, ||
examples:
"common_preempt_count > 4" > filter
"((sig >= 10 && sig < 15) || sig == 17) && comm != bash" > filter
If there was an error, the erroneous string along with an error
message can be seen by looking at the filter e.g.:
((sig >= 10 && sig < 15) || dsig == 17) && comm != bash
^
parse_error: Field not found
Currently the caret for an error always appears at the beginning of
the filter; a real position should be used, but the error message
should be useful even without it.
To clear a filter, '0' can be written to the filter file.
Filters can also be set or cleared for a complete subsystem by writing
the same filter as would be written to an individual event to the
filter file at the root of the subsytem. Note however, that if any
event in the subsystem lacks a field specified in the filter being
set, the set will fail and all filters in the subsytem are
automatically cleared. This change from the previous version was made
because using only the fields that happen to exist for a given event
would most likely result in a meaningless filter.
Because the logical operators are now implemented as predicates, the
maximum number of predicates in a filter was increased from 8 to 16.
[ Impact: add new, extended trace-filter implementation ]
Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: fweisbec@gmail.com
Cc: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <1240905899.6416.121.camel@tropicana>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-04-28 01:04:59 -07:00
|
|
|
int op;
|
|
|
|
int pop_n;
|
2009-03-22 01:31:04 -07:00
|
|
|
};
|
|
|
|
|
tracing/filters: a better event parser
Replace the current event parser hack with a better one. Filters are
no longer specified predicate by predicate, but all at once and can
use parens and any of the following operators:
numeric fields:
==, !=, <, <=, >, >=
string fields:
==, !=
predicates can be combined with the logical operators:
&&, ||
examples:
"common_preempt_count > 4" > filter
"((sig >= 10 && sig < 15) || sig == 17) && comm != bash" > filter
If there was an error, the erroneous string along with an error
message can be seen by looking at the filter e.g.:
((sig >= 10 && sig < 15) || dsig == 17) && comm != bash
^
parse_error: Field not found
Currently the caret for an error always appears at the beginning of
the filter; a real position should be used, but the error message
should be useful even without it.
To clear a filter, '0' can be written to the filter file.
Filters can also be set or cleared for a complete subsystem by writing
the same filter as would be written to an individual event to the
filter file at the root of the subsytem. Note however, that if any
event in the subsystem lacks a field specified in the filter being
set, the set will fail and all filters in the subsytem are
automatically cleared. This change from the previous version was made
because using only the fields that happen to exist for a given event
would most likely result in a meaningless filter.
Because the logical operators are now implemented as predicates, the
maximum number of predicates in a filter was increased from 8 to 16.
[ Impact: add new, extended trace-filter implementation ]
Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: fweisbec@gmail.com
Cc: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <1240905899.6416.121.camel@tropicana>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-04-28 01:04:59 -07:00
|
|
|
extern void print_event_filter(struct ftrace_event_call *call,
|
2009-03-24 00:14:31 -07:00
|
|
|
struct trace_seq *s);
|
tracing/filters: a better event parser
Replace the current event parser hack with a better one. Filters are
no longer specified predicate by predicate, but all at once and can
use parens and any of the following operators:
numeric fields:
==, !=, <, <=, >, >=
string fields:
==, !=
predicates can be combined with the logical operators:
&&, ||
examples:
"common_preempt_count > 4" > filter
"((sig >= 10 && sig < 15) || sig == 17) && comm != bash" > filter
If there was an error, the erroneous string along with an error
message can be seen by looking at the filter e.g.:
((sig >= 10 && sig < 15) || dsig == 17) && comm != bash
^
parse_error: Field not found
Currently the caret for an error always appears at the beginning of
the filter; a real position should be used, but the error message
should be useful even without it.
To clear a filter, '0' can be written to the filter file.
Filters can also be set or cleared for a complete subsystem by writing
the same filter as would be written to an individual event to the
filter file at the root of the subsytem. Note however, that if any
event in the subsystem lacks a field specified in the filter being
set, the set will fail and all filters in the subsytem are
automatically cleared. This change from the previous version was made
because using only the fields that happen to exist for a given event
would most likely result in a meaningless filter.
Because the logical operators are now implemented as predicates, the
maximum number of predicates in a filter was increased from 8 to 16.
[ Impact: add new, extended trace-filter implementation ]
Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: fweisbec@gmail.com
Cc: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <1240905899.6416.121.camel@tropicana>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-04-28 01:04:59 -07:00
|
|
|
extern int apply_event_filter(struct ftrace_event_call *call,
|
|
|
|
char *filter_string);
|
|
|
|
extern int apply_subsystem_event_filter(struct event_subsystem *system,
|
|
|
|
char *filter_string);
|
|
|
|
extern void print_subsystem_event_filter(struct event_subsystem *system,
|
2009-04-16 22:27:08 -07:00
|
|
|
struct trace_seq *s);
|
2009-08-06 19:33:02 -07:00
|
|
|
extern int filter_assign_type(const char *type);
|
2009-03-22 01:31:04 -07:00
|
|
|
|
2009-04-08 01:15:54 -07:00
|
|
|
static inline int
|
2009-03-30 22:48:49 -07:00
|
|
|
filter_check_discard(struct ftrace_event_call *call, void *rec,
|
2009-04-08 01:15:54 -07:00
|
|
|
struct ring_buffer *buffer,
|
2009-03-30 22:48:49 -07:00
|
|
|
struct ring_buffer_event *event)
|
|
|
|
{
|
2009-04-28 01:04:47 -07:00
|
|
|
if (unlikely(call->filter_active) && !filter_match_preds(call, rec)) {
|
2009-04-08 01:15:54 -07:00
|
|
|
ring_buffer_discard_commit(buffer, event);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
2009-03-30 22:48:49 -07:00
|
|
|
}
|
|
|
|
|
2009-05-05 19:33:45 -07:00
|
|
|
extern struct mutex event_mutex;
|
2009-04-10 10:52:20 -07:00
|
|
|
extern struct list_head ftrace_events;
|
2009-03-19 12:26:15 -07:00
|
|
|
|
2009-03-12 11:19:25 -07:00
|
|
|
extern const char *__start___trace_bprintk_fmt[];
|
|
|
|
extern const char *__stop___trace_bprintk_fmt[];
|
|
|
|
|
2009-03-30 22:48:49 -07:00
|
|
|
#undef TRACE_EVENT_FORMAT
|
|
|
|
#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
|
|
|
|
extern struct ftrace_event_call event_##call;
|
2009-03-30 22:49:16 -07:00
|
|
|
#undef TRACE_EVENT_FORMAT_NOFILTER
|
|
|
|
#define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, tpfmt)
|
2009-03-30 22:48:49 -07:00
|
|
|
#include "trace_event_types.h"
|
|
|
|
|
2008-05-12 12:20:42 -07:00
|
|
|
#endif /* _LINUX_KERNEL_TRACE_H */
|