Paul E. McKenney 67182ae1c4 rcu, debug: detect stalled grace periods ... this is a diagnostic patch for Classic RCU. The approach is to record a timestamp at the beginning of the grace period (in rcu_start_batch()), then have rcu_check_callbacks() complain if: 1. it is running on a CPU that has holding up grace periods for a long time (say one second). This will identify the culprit assuming that the culprit has not disabled hardware irqs, instruction execution, or some such. 2. it is running on a CPU that is not holding up grace periods, but grace periods have been held up for an even longer time (say two seconds). It is enabled via the default-off CONFIG_DEBUG_RCU_STALL kernel parameter. Rather than exponential backoff, it backs off to once per 30 seconds. My feeling upon thinking on it was that if you have stalled RCU grace periods for that long, a few extra printk() messages are probably the least of your worries... Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Yinghai Lu <yhlu.kernel@gmail.com> Cc: David Witbrodt <dawitbro@sbcglobal.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>		2008-08-11 13:35:18 +02:00
..
lzo	lzo: use get/put_unaligned_* helpers	2008-07-25 10:53:26 -07:00
reed_solomon	lib: Remove unnecessary inclusions of asm/semaphore.h	2008-04-18 22:17:17 -04:00
zlib_deflate	lib/: Spelling fixes	2008-02-03 17:48:52 +02:00
zlib_inflate
.gitignore
argv_split.c
audit.c
bcd.c	rtc: BCD codeshrink	2008-07-24 10:47:33 -07:00
bitmap.c	cpumask: remove bitmap_scnprintf_len and cpumask_scnprintf_len	2008-05-13 08:02:25 -07:00
bitrev.c	lib: export bitrev16	2008-06-06 11:29:10 -07:00
bug.c	lib: taint kernel in common report_bug() WARN path.	2008-07-04 10:40:05 -07:00
bust_spinlocks.c
check_signature.c
cmdline.c	lib: allow memparse() to accept a NULL and ignorable second parm	2008-07-25 10:53:27 -07:00
cpumask.c	x86: Add performance variants of cpumask operators	2008-05-23 18:23:38 +02:00
crc7.c
crc16.c
crc32.c	lib/: Spelling fixes	2008-02-03 17:48:52 +02:00
crc32defs.h
crc-ccitt.c
crc-itu-t.c
crc-t10dif.c	[SCSI] lib: Add support for the T10 (SCSI) Data Integrity Field CRC	2008-07-12 08:22:32 -05:00
ctype.c
debug_locks.c
debugobjects.c	Use WARN() in lib/	2008-07-26 12:00:07 -07:00
dec_and_lock.c
devres.c	[POWERPC] devres: Add devm_ioremap_prot()	2008-05-05 16:47:14 +10:00
div64.c	add an inlined version of iter_div_u64_rem	2008-06-12 10:47:58 +02:00
dump_stack.c
extable.c	lib/extable.c: remove an expensive integer divide in search_extable()	2008-02-06 10:41:08 -08:00
fault-inject.c	libfs: allow error return from simple attributes	2008-02-08 09:22:34 -08:00
find_next_bit.c	bitops: remove "optimizations"	2008-04-29 08:11:16 -07:00
gen_crc32table.c
genalloc.c
halfmd4.c
hexdump.c	lib: create common ascii hex array	2008-05-14 19:11:14 -07:00
hweight.c
idr.c	SL*B: drop kmem cache argument from constructor	2008-07-26 12:00:07 -07:00
inflate.c	inflate: refactor inflate malloc code	2008-07-25 10:53:28 -07:00
int_sqrt.c
iomap_copy.c
iomap.c	Use WARN() in lib/	2008-07-26 12:00:07 -07:00
iommu-helper.c	generic, x86: fix add iommu_num_pages helper function	2008-07-29 12:12:48 +02:00
ioremap.c
irq_regs.c
kasprintf.c
Kconfig	[SCSI] lib: Add support for the T10 (SCSI) Data Integrity Field CRC	2008-07-12 08:22:32 -05:00
Kconfig.debug	rcu, debug: detect stalled grace periods	2008-08-11 13:35:18 +02:00
Kconfig.kgdb	kgdb: remove the requirement for CONFIG_FRAME_POINTER	2008-08-01 08:39:34 -05:00
kernel_lock.c	BKL: revert back to the old spinlock implementation	2008-05-10 20:58:02 -07:00
klist.c	klist: fix coding style errors in klist.h and klist.c	2008-04-30 16:52:58 -07:00
kobject_uevent.c	Use WARN() in lib/	2008-07-26 12:00:07 -07:00
kobject.c	Example use of WARN()	2008-07-25 10:53:29 -07:00
kref.c
libcrc32c.c
list_debug.c	list debugging: use WARN() instead of BUG()	2008-07-25 10:53:29 -07:00
lmb.c	lmb: Fix compile warning	2008-05-18 23:35:43 -05:00
locking-selftest-hardirq.h
locking-selftest-mutex.h
locking-selftest-rlock-hardirq.h
locking-selftest-rlock-softirq.h
locking-selftest-rlock.h
locking-selftest-rsem.h
locking-selftest-softirq.h
locking-selftest-spin-hardirq.h
locking-selftest-spin-softirq.h
locking-selftest-spin.h
locking-selftest-wlock-hardirq.h
locking-selftest-wlock-softirq.h
locking-selftest-wlock.h
locking-selftest-wsem.h
locking-selftest.c
Makefile	lib: generic show_mem()	2008-07-26 12:00:10 -07:00
parser.c	add match_strlcpy() us it to make v9fs make uname and remotename parsing more robust	2008-05-14 19:23:25 -05:00
percpu_counter.c	percpu_counter: new function percpu_counter_sum_and_set	2008-07-11 19:27:31 -04:00
plist.c	Use WARN() in lib/	2008-07-26 12:00:07 -07:00
prio_heap.c
prio_tree.c
proportions.c	mm: bdi: allow setting a maximum for the bdi dirty limit	2008-04-30 08:29:50 -07:00
radix-tree.c	SL*B: drop kmem cache argument from constructor	2008-07-26 12:00:07 -07:00
random32.c	random32: seeding improvement	2008-07-30 16:29:19 -07:00
ratelimit.c	__ratelimit() cpu flags can't be static	2008-07-28 16:30:20 -07:00
rbtree.c
reciprocal_div.c
rwsem-spinlock.c	lib: remove fastcall from lib/*	2008-02-08 09:22:31 -08:00
rwsem.c
scatterlist.c	sg: reimplement sg mapping iterator	2008-07-23 14:42:09 +02:00
sha1.c
show_mem.c	lib: generic show_mem()	2008-07-26 12:00:10 -07:00
smp_processor_id.c	cpumask: change cpumask_of_cpu_ptr to use new cpumask_of_cpu	2008-07-26 16:40:33 +02:00
sort.c
spinlock_debug.c
string.c	Add a new sysfs_streq() string comparison function	2008-05-01 08:03:59 -07:00
swiotlb.c	dma-mapping: add the device argument to dma_mapping_error()	2008-07-26 12:00:03 -07:00
syscall.c	task_current_syscall	2008-07-26 12:00:10 -07:00
textsearch.c	remove CONFIG_KMOD from lib	2008-07-22 19:24:31 +10:00
ts_bm.c	textsearch: ts_bm: support case insensitive searching in Boyer-Moore algorithm	2008-07-08 02:37:54 -07:00
ts_fsm.c	textsearch: ts_fsm: return error on request for case insensitive search	2008-07-08 02:38:27 -07:00
ts_kmp.c	textsearch: ts_kmp: support case insensitive searching in Knuth-Morris-Pratt algorithm	2008-07-08 02:38:09 -07:00
vsprintf.c	vsprintf: add support for '%pS' and '%pF' pointer formats	2008-07-06 16:55:51 -07:00