0a02ad9331
This turn-key tool allows scheduler measurements to be conducted and the results be displayed numerically. First baby step towards that goal: clone the new command off of perf trace. Fix a few other details along the way: - add (minimal) perf trace documentation - reorder a few places - list perf trace in the mainporcelain list as well as it's a very useful utility. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
298 lines
5.9 KiB
C
298 lines
5.9 KiB
C
#include "builtin.h"
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#include "util/util.h"
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#include "util/cache.h"
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#include "util/symbol.h"
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#include "util/thread.h"
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#include "util/header.h"
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#include "util/parse-options.h"
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#include "perf.h"
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#include "util/debug.h"
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#include "util/trace-event.h"
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static char const *input_name = "perf.data";
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static int input;
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static unsigned long page_size;
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static unsigned long mmap_window = 32;
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static unsigned long total = 0;
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static unsigned long total_comm = 0;
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static struct rb_root threads;
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static struct thread *last_match;
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static struct perf_header *header;
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static u64 sample_type;
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static int
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process_comm_event(event_t *event, unsigned long offset, unsigned long head)
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{
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struct thread *thread;
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thread = threads__findnew(event->comm.pid, &threads, &last_match);
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dump_printf("%p [%p]: PERF_EVENT_COMM: %s:%d\n",
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(void *)(offset + head),
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(void *)(long)(event->header.size),
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event->comm.comm, event->comm.pid);
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if (thread == NULL ||
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thread__set_comm(thread, event->comm.comm)) {
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dump_printf("problem processing PERF_EVENT_COMM, skipping event.\n");
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return -1;
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}
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total_comm++;
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return 0;
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}
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static int
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process_sample_event(event_t *event, unsigned long offset, unsigned long head)
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{
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char level;
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int show = 0;
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struct dso *dso = NULL;
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struct thread *thread;
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u64 ip = event->ip.ip;
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u64 timestamp = -1;
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u32 cpu = -1;
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u64 period = 1;
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void *more_data = event->ip.__more_data;
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int cpumode;
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thread = threads__findnew(event->ip.pid, &threads, &last_match);
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if (sample_type & PERF_SAMPLE_TIME) {
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timestamp = *(u64 *)more_data;
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more_data += sizeof(u64);
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}
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if (sample_type & PERF_SAMPLE_CPU) {
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cpu = *(u32 *)more_data;
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more_data += sizeof(u32);
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more_data += sizeof(u32); /* reserved */
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}
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if (sample_type & PERF_SAMPLE_PERIOD) {
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period = *(u64 *)more_data;
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more_data += sizeof(u64);
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}
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dump_printf("%p [%p]: PERF_EVENT_SAMPLE (IP, %d): %d/%d: %p period: %Ld\n",
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(void *)(offset + head),
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(void *)(long)(event->header.size),
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event->header.misc,
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event->ip.pid, event->ip.tid,
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(void *)(long)ip,
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(long long)period);
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dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
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if (thread == NULL) {
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eprintf("problem processing %d event, skipping it.\n",
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event->header.type);
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return -1;
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}
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cpumode = event->header.misc & PERF_EVENT_MISC_CPUMODE_MASK;
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if (cpumode == PERF_EVENT_MISC_KERNEL) {
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show = SHOW_KERNEL;
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level = 'k';
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dso = kernel_dso;
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dump_printf(" ...... dso: %s\n", dso->name);
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} else if (cpumode == PERF_EVENT_MISC_USER) {
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show = SHOW_USER;
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level = '.';
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} else {
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show = SHOW_HV;
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level = 'H';
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dso = hypervisor_dso;
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dump_printf(" ...... dso: [hypervisor]\n");
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}
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if (sample_type & PERF_SAMPLE_RAW) {
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struct {
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u32 size;
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char data[0];
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} *raw = more_data;
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/*
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* FIXME: better resolve from pid from the struct trace_entry
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* field, although it should be the same than this perf
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* event pid
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*/
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print_event(cpu, raw->data, raw->size, timestamp, thread->comm);
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}
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total += period;
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return 0;
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}
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static int
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process_event(event_t *event, unsigned long offset, unsigned long head)
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{
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trace_event(event);
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switch (event->header.type) {
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case PERF_EVENT_MMAP ... PERF_EVENT_LOST:
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return 0;
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case PERF_EVENT_COMM:
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return process_comm_event(event, offset, head);
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case PERF_EVENT_EXIT ... PERF_EVENT_READ:
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return 0;
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case PERF_EVENT_SAMPLE:
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return process_sample_event(event, offset, head);
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case PERF_EVENT_MAX:
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default:
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return -1;
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}
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return 0;
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}
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static int __cmd_sched(void)
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{
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int ret, rc = EXIT_FAILURE;
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unsigned long offset = 0;
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unsigned long head = 0;
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struct stat perf_stat;
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event_t *event;
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uint32_t size;
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char *buf;
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trace_report();
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register_idle_thread(&threads, &last_match);
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input = open(input_name, O_RDONLY);
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if (input < 0) {
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perror("failed to open file");
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exit(-1);
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}
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ret = fstat(input, &perf_stat);
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if (ret < 0) {
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perror("failed to stat file");
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exit(-1);
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}
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if (!perf_stat.st_size) {
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fprintf(stderr, "zero-sized file, nothing to do!\n");
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exit(0);
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}
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header = perf_header__read(input);
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head = header->data_offset;
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sample_type = perf_header__sample_type(header);
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if (!(sample_type & PERF_SAMPLE_RAW))
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die("No trace sample to read. Did you call perf record "
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"without -R?");
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if (load_kernel() < 0) {
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perror("failed to load kernel symbols");
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return EXIT_FAILURE;
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}
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remap:
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buf = (char *)mmap(NULL, page_size * mmap_window, PROT_READ,
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MAP_SHARED, input, offset);
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if (buf == MAP_FAILED) {
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perror("failed to mmap file");
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exit(-1);
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}
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more:
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event = (event_t *)(buf + head);
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size = event->header.size;
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if (!size)
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size = 8;
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if (head + event->header.size >= page_size * mmap_window) {
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unsigned long shift = page_size * (head / page_size);
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int res;
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res = munmap(buf, page_size * mmap_window);
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assert(res == 0);
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offset += shift;
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head -= shift;
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goto remap;
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}
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size = event->header.size;
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if (!size || process_event(event, offset, head) < 0) {
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/*
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* assume we lost track of the stream, check alignment, and
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* increment a single u64 in the hope to catch on again 'soon'.
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*/
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if (unlikely(head & 7))
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head &= ~7ULL;
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size = 8;
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}
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head += size;
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if (offset + head < (unsigned long)perf_stat.st_size)
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goto more;
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rc = EXIT_SUCCESS;
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close(input);
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return rc;
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}
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static const char * const annotate_usage[] = {
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"perf trace [<options>] <command>",
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NULL
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};
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static const struct option options[] = {
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OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
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"dump raw trace in ASCII"),
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OPT_BOOLEAN('v', "verbose", &verbose,
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"be more verbose (show symbol address, etc)"),
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OPT_END()
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};
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int cmd_sched(int argc, const char **argv, const char *prefix __used)
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{
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symbol__init();
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page_size = getpagesize();
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argc = parse_options(argc, argv, options, annotate_usage, 0);
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if (argc) {
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/*
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* Special case: if there's an argument left then assume tha
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* it's a symbol filter:
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*/
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if (argc > 1)
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usage_with_options(annotate_usage, options);
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}
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setup_pager();
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return __cmd_sched();
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}
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