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Paul E. McKenney d21670acab rcu: reduce the number of spurious RCU_SOFTIRQ invocations 
Lai Jiangshan noted that up to 10% of the RCU_SOFTIRQ are spurious, and
traced this down to the fact that the current grace-period machinery
will uselessly raise RCU_SOFTIRQ when a given CPU needs to go through
a quiescent state, but has not yet done so.  In this situation, there
might well be nothing that RCU_SOFTIRQ can do, and the overhead can be
worth worrying about in the ksoftirqd case.  This patch therefore avoids
raising RCU_SOFTIRQ in this situation.

Changes since v1 (http://lkml.org/lkml/2010/3/30/122 from Lai Jiangshan):

o	Omit the rcu_qs_pending() prechecks, as they aren't that
	much less expensive than the quiescent-state checks.

o	Merge with the set_need_resched() patch that reduces IPIs.

o	Add the new n_rp_report_qs field to the rcu_pending tracing output.

o	Update the tracing documentation accordingly.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
2010-05-10 11:08:35 -07:00
..
gcov
microblaze: Enable GCOV_PROFILE_ALL
2009-09-21 14:29:21 +02:00
irq
Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2010-04-06 13:03:22 -07:00
power
PM / Hibernate: user.c, fix SNAPSHOT_SET_SWAP_AREA handling
2010-04-10 22:28:56 +02:00
time
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
trace
Merge branch 'master' into export-slabh
2010-04-05 11:37:28 +09:00
.gitignore
…
acct.c
copy_signal() cleanup: kill taskstats_tgid_init() and acct_init_pacct()
2010-03-12 15:52:39 -08:00
async.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
audit_tree.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
audit_watch.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
audit.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
audit.h
…
auditfilter.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
auditsc.c
audit: preface audit printk with audit
2010-04-05 13:19:45 -07:00
backtracetest.c
…
bounds.c
kbuild: move bounds.h to include/generated
2009-12-12 13:08:14 +01:00
capability.c
capabilities: Use RCU to protect task lookup in sys_capget
2009-12-10 09:42:48 +11:00
cgroup_freezer.c
rcu: Fix RCU lockdep splat on freezer_fork path
2010-04-30 12:03:17 +02:00
cgroup.c
cgroup: Fix an RCU warning in alloc_css_id()
2010-05-04 09:25:00 -07:00
compat.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
configs.c
…
cpu.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
cpuset.c
cpuset: alloc nodemask_t on the heap rather than the stack
2010-03-24 16:31:21 -07:00
cred-internals.h
…
cred.c
CRED: Fix a race in creds_are_invalid() in credentials debugging
2010-04-22 09:14:29 +10:00
delayacct.c
headers: taskstats_kern.h trim
2009-09-18 09:48:52 -07:00
dma.c
…
early_res.c
x86: Do not free zero sized per cpu areas
2010-03-29 18:55:40 +02:00
elfcore.c
elf coredump: add extended numbering support
2010-03-06 11:26:46 -08:00
exec_domain.c
…
exit.c
mm: avoid null-pointer deref in sync_mm_rss()
2010-04-07 08:38:02 -07:00
extable.c
…
fork.c
mm: avoid null-pointer deref in sync_mm_rss()
2010-04-07 08:38:02 -07:00
freezer.c
…
futex_compat.c
futex: Protect pid lookup in compat code with RCU
2009-12-09 14:22:14 +01:00
futex.c
futex: Handle futex value corruption gracefully
2010-02-03 15:13:22 +01:00
groups.c
…
hrtimer.c
hrtimers: Convert to raw_spinlocks
2009-12-14 23:55:34 +01:00
hung_task.c
softlockup: Fix hung_task_check_count sysctl
2009-11-27 06:21:57 +01:00
hw_breakpoint.c
Merge branch 'perf/core' into perf/urgent
2010-03-04 11:47:52 +01:00
itimer.c
itimers: Fix racy writes to cpu_itimer fields
2009-11-18 16:32:12 +01:00
kallsyms.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
mutex: Better control mutex adaptive spinning config
2009-12-03 11:50:11 +01:00
Kconfig.preempt
…
kexec.c
percpu: add __percpu sparse annotations to core kernel subsystems
2010-02-17 11:17:38 +09:00
kfifo.c
kfifo: Don't use integer as NULL pointer
2010-02-16 15:11:08 -08:00
kgdb.c
kgdb: Turn off tracing while in the debugger
2010-04-02 14:58:19 -05:00
kmod.c
kmod: fix resource leak in call_usermodehelper_pipe()
2010-01-11 09:34:04 -08:00
kprobes.c
kprobes: Calculate the index correctly when freeing the out-of-line execution slot
2010-03-11 14:06:16 +01:00
ksysfs.c
Merge branch 'for-next' into for-linus
2010-03-08 16:55:37 +01:00
kthread.c
cpuset: fix the problem that cpuset_mem_spread_node() returns an offline node
2010-03-24 16:31:21 -07:00
latencytop.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
lockdep_internals.h
…
lockdep_proc.c
seq_file: constify seq_operations
2009-09-23 07:39:29 -07:00
lockdep_states.h
…
lockdep.c
rcu: optionally leave lockdep enabled after RCU lockdep splat
2010-05-10 11:08:31 -07:00
Makefile
elf coredump: replace ELF_CORE_EXTRA_* macros by functions
2010-03-06 11:26:45 -08:00
module.c
Fix up possibly racy module refcounting
2010-04-05 19:50:02 -07:00
mutex-debug.c
headers: remove sched.h from interrupt.h
2009-10-11 11:20:58 -07:00
mutex-debug.h
locking: Implement new raw_spinlock
2009-12-14 23:55:32 +01:00
mutex.c
mutex: Better control mutex adaptive spinning config
2009-12-03 11:50:11 +01:00
mutex.h
…
notifier.c
sched: Use lockdep-based checking on rcu_dereference()
2010-02-25 10:34:26 +01:00
ns_cgroup.c
cgroups: let ss->can_attach and ss->attach do whole threadgroups at a time
2009-09-24 07:20:58 -07:00
nsproxy.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
padata.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
panic.c
panic: fix panic_timeout accuracy when running on a hypervisor
2010-03-06 11:26:33 -08:00
params.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2010-03-12 16:04:50 -08:00
perf_event.c
perf: Fix resource leak in failure path of perf_event_open()
2010-05-01 13:11:25 +02:00
pid_namespace.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
pid.c
Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2010-03-13 14:43:01 -08:00
pm_qos_params.c
pm_qos: clean up racy global "name" variable
2009-10-14 15:31:10 +02:00
posix-cpu-timers.c
Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2010-03-26 15:10:38 -07:00
posix-timers.c
posix-timers.c: Don't export local functions
2010-02-05 14:54:10 +01:00
printk.c
printk: avoid warning when CONFIG_PRINTK is disabled
2010-03-06 11:26:33 -08:00
profile.c
kernel/profile.c: Switch /proc/irq/prof_cpu_mask to seq_file
2009-09-20 20:15:40 +02:00
ptrace.c
ptrace: Fix ptrace_regset() comments and diagnose errors specifically
2010-02-23 13:45:26 -08:00
range.c
x86: Change range end to start+size
2010-02-10 17:47:17 -08:00
rcupdate.c
rcu: slim down rcutiny by removing rcu_scheduler_active and friends
2010-05-10 11:08:34 -07:00
rcutiny_plugin.h
rcu: slim down rcutiny by removing rcu_scheduler_active and friends
2010-05-10 11:08:34 -07:00
rcutiny.c
rcu: slim down rcutiny by removing rcu_scheduler_active and friends
2010-05-10 11:08:34 -07:00
rcutorture.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
2010-03-03 07:34:18 -08:00
rcutree_plugin.h
rcu: print boot-time console messages if RCU configs out of ordinary
2010-05-10 11:08:34 -07:00
rcutree_trace.c
rcu: reduce the number of spurious RCU_SOFTIRQ invocations
2010-05-10 11:08:35 -07:00
rcutree.c
rcu: reduce the number of spurious RCU_SOFTIRQ invocations
2010-05-10 11:08:35 -07:00
rcutree.h
rcu: reduce the number of spurious RCU_SOFTIRQ invocations
2010-05-10 11:08:35 -07:00
relay.c
splice: comparing unsigned int < 0
2010-03-06 11:26:32 -08:00
res_counter.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
resource.c
resources: add interfaces that return conflict information
2010-03-23 13:33:50 -07:00
rtmutex_common.h
…
rtmutex-debug.c
sched: Convert pi_lock to raw_spinlock
2009-12-14 23:55:33 +01:00
rtmutex-debug.h
…
rtmutex-tester.c
…
rtmutex.c
rtmutes: Convert rtmutex.lock to raw_spinlock
2009-12-14 23:55:33 +01:00
rtmutex.h
…
rwsem.c
…
sched_clock.c
sched: Fix cpu_clock() in NMIs, on !CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
2009-12-15 09:04:36 +01:00
sched_cpupri.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
sched_cpupri.h
sched: Convert cpupri lock to raw_spinlock
2009-12-14 23:55:33 +01:00
sched_debug.c
sched: Fix an RCU warning in print_task()
2010-05-04 09:25:01 -07:00
sched_fair.c
sched, rcu: Fix rcu_dereference() for RCU-lockdep
2010-03-01 09:29:58 +01:00
sched_features.h
sched: Discard some old bits
2009-12-09 10:03:07 +01:00
sched_idletask.c
sched: Remove the sched_class load_balance methods
2010-01-21 13:40:09 +01:00
sched_rt.c
Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2010-03-13 14:46:18 -08:00
sched_stats.h
…
sched.c
rcu: refactor RCU's context-switch handling
2010-05-10 11:08:33 -07:00
seccomp.c
…
semaphore.c
…
signal.c
kernel core: use helpers for rlimits
2010-03-06 11:26:33 -08:00
slow-work-debugfs.c
SLOW_WORK: Move slow_work's proc file to debugfs
2009-12-01 08:20:31 -08:00
slow-work.c
slow-work: use get_ref wrapper instead of directly calling get_ref
2010-03-29 09:13:30 -07:00
slow-work.h
SLOW_WORK: CONFIG_SLOW_WORK_PROC should be CONFIG_SLOW_WORK_DEBUG
2010-03-29 09:14:47 -07:00
smp.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
softirq.c
rcu: refactor RCU's context-switch handling
2010-05-10 11:08:33 -07:00
softlockup.c
softlockup: Stop spurious softlockup messages due to overflow
2010-03-21 19:30:13 +01:00
spinlock.c
locking: Cleanup the name space completely
2009-12-14 23:55:33 +01:00
srcu.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
stacktrace.c
…
stop_machine.c
percpu: add __percpu sparse annotations to core kernel subsystems
2010-02-17 11:17:38 +09:00
sys_ni.c
Add generic sys_ipc wrapper
2010-03-12 15:52:32 -08:00
sys.c
kernel/sys.c: fix compat uname machine
2010-04-24 11:31:24 -07:00
sysctl_binary.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
sysctl_check.c
ipv4 05/05: add sysctl to accept packets with local source addresses
2009-12-03 12:14:38 -08:00
sysctl.c
sysctl extern cleanup: lockdep
2010-03-12 15:53:10 -08:00
taskstats.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
test_kprobes.c
…
time.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
timeconst.pl
…
timer.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
tracepoint.c
trivial: fix typo "to to" in multiple files
2009-09-21 15:14:55 +02:00
tsacct.c
mm: clean up mm_counter
2010-03-06 11:26:23 -08:00
uid16.c
headers: utsname.h redux
2009-09-23 18:13:10 -07:00
up.c
…
user_namespace.c
…
user-return-notifier.c
core: Clean up user return notifers use of per_cpu
2009-12-02 10:22:59 +01:00
user.c
sched: Remove USER_SCHED
2010-01-21 13:40:18 +01:00
utsname_sysctl.c
sysctl kernel: Remove binary sysctl logic
2009-11-12 02:04:55 -08:00
utsname.c
…
wait.c
…
workqueue.c
workqueue: flush_delayed_work: keep the original workqueue for re-queueing
2010-04-30 07:24:51 +02:00