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	[ZLIB]: Fix external builds of zlib_inflate code.	2007-10-11 22:17:20 -07:00
.gitignore	Add some basic .gitignore files	2005-10-18 08:26:15 -07:00
argv_split.c	LIB: Replace inappropriate include of <linux/bug.h>	2007-10-20 00:26:10 +02:00
audit.c	[PATCH] audit signal recipients	2007-05-11 05:38:25 -04:00
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	handle recursive calls to bust_spinlocks()	2007-10-17 08:42:56 -07:00
check_signature.c	uninline check_signature()	2007-07-16 09:05:50 -07:00
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	CRC7 support	2007-07-17 10:23:04 -07:00
crc16.c	[PATCH] kernel-doc for lib/crc*.c	2006-06-25 10:01:20 -07:00
crc32.c	lib/: Spelling fixes	2008-02-03 17:48:52 +02:00
crc32defs.h
crc-ccitt.c	[PATCH] kernel-doc for lib/crc*.c	2006-06-25 10:01:20 -07:00
crc-itu-t.c	CRC ITU-T V.41	2007-05-10 18:24:13 +02:00
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	[PATCH] lockdep: better lock debugging	2006-07-03 15:27:01 -07:00
debugobjects.c	Use WARN() in lib/	2008-07-26 12:00:07 -07:00
dec_and_lock.c	[PATCH] atomic: dec_and_lock use atomic primitives	2006-01-08 20:13:48 -08:00
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	Slab allocators: Replace explicit zeroing with __GFP_ZERO	2007-07-17 10:23:02 -07:00
halfmd4.c
hexdump.c	lib: create common ascii hex array	2008-05-14 19:11:14 -07:00
hweight.c	remove asm/bitops.h includes	2007-10-19 11:53:41 -07:00
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	[PATCH] lib: Fix bug in int_sqrt() for 64 bit longs	2006-02-03 08:32:08 -08:00
iomap_copy.c	[PATCH] add __iowrite64_copy	2006-06-20 20:24:58 -07:00
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	lib/ioremap.c should #include <linux/io.h>	2007-10-17 08:42:50 -07:00
irq_regs.c	[PATCH] irq_reqs: export __irq_regs	2006-10-06 08:53:40 -07:00
kasprintf.c	lib: move kasprintf to a separate file	2007-07-31 15:39:39 -07:00
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	kref: add kref_set()	2008-01-24 20:40:05 -08:00
libcrc32c.c	[LIB] crc32c: Keep intermediate crc state in cpu order	2007-11-08 21:34:09 +08:00
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	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-mutex.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-rlock-hardirq.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-rlock-softirq.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-rlock.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-rsem.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-softirq.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-spin-hardirq.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-spin-softirq.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-spin.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-wlock-hardirq.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-wlock-softirq.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-wlock.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-wsem.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest.c	[PATCH] lockdep: show more details about self-test failures	2006-12-07 08:39:43 -08:00
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	Fix cpusets update_cpumask	2007-10-19 11:53:41 -07:00
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	[PATCH] rbtree: fixed reversed RB_EMPTY_NODE and rb_next/prev	2006-09-30 20:26:56 +02:00
reciprocal_div.c	[PATCH] SLAB: use a multiply instead of a divide in obj_to_index()	2006-12-13 09:05:49 -08:00
rwsem-spinlock.c	lib: remove fastcall from lib/*	2008-02-08 09:22:31 -08:00
rwsem.c	x86: fix UML and -regparm=3	2008-01-30 13:33:00 +01:00
scatterlist.c	sg: reimplement sg mapping iterator	2008-07-23 14:42:09 +02:00
sha1.c	[PATCH] Numerous fixes to kernel-doc info in source files.	2007-02-11 10:51:32 -08:00
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	lib/sort.c optimization	2007-10-17 08:42:52 -07:00
spinlock_debug.c	Use helpers to obtain task pid in printks	2007-10-19 11:53:43 -07:00
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