Paul E. McKenney d550e81dc0 timers: Reduce __run_timers() latency for empty list ... The __run_timers() function currently steps through the list one jiffy at a time in order to update the timer wheel. However, if the timer wheel is empty, no adjustment is needed other than updating ->timer_jiffies. In this case, which is likely to be common for NO_HZ_FULL kernels, the kernel currently incurs a large latency for no good reason. This commit therefore short-circuits this case. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Acked-by: Peter Zijlstra <peterz@infradead.org> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Reviewed-by: Steven Rostedt <rostedt@goodmis.org> Tested-by: Mike Galbraith <bitbucket@online.de>		2014-02-25 12:39:00 -08:00
..
cpu	sched/preempt: Fix up missed PREEMPT_NEED_RESCHED folding	2014-01-13 17:38:55 +01:00
debug	kgdb/kdb: Fix no KDB config problem	2014-01-25 08:55:09 +01:00
events	This pull request has a new feature to ftrace, namely the trace event	2014-01-22 16:35:21 -08:00
gcov
irq
locking	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-01-20 10:42:08 -08:00
power	Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block	2014-01-30 11:19:05 -08:00
printk	printk: flush conflicting continuation line	2014-01-23 16:36:56 -08:00
rcu	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-01-28 08:38:04 -08:00
sched	Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-01-31 09:02:51 -08:00
time	tick: Fixup more fallout from hrtimer broadcast mode	2014-02-09 15:11:47 +01:00
trace	Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block	2014-01-30 11:19:05 -08:00
.gitignore
acct.c
async.c
audit.c	audit: fix location of __net_initdata for audit_net_ops	2014-01-17 17:14:32 -05:00
audit.h	audit: Convert int limit uses to u32	2014-01-14 14:54:00 -05:00
audit_tree.c	fsnotify: remove pointless NULL initializers	2014-01-21 16:19:41 -08:00
audit_watch.c	fsnotify: remove pointless NULL initializers	2014-01-21 16:19:41 -08:00
auditfilter.c	audit: log on errors from filter user rules	2014-01-13 22:32:31 -05:00
auditsc.c	audit: fix dangling keywords in audit_log_set_loginuid() output	2014-01-13 22:32:38 -05:00
backtracetest.c
bounds.c
capability.c	audit: Simplify and correct audit_log_capset	2014-01-13 22:26:48 -05:00
cgroup.c	Merge branch 'for-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2014-01-21 17:51:34 -08:00
cgroup_freezer.c
compat.c
configs.c
context_tracking.c
cpu.c
cpu_pm.c
cpuset.c
crash_dump.c
cred.c
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c	introduce for_each_thread() to replace the buggy while_each_thread()	2014-01-21 16:19:46 -08:00
extable.c
fork.c	exec: kill task_struct->did_exec	2014-01-23 16:37:02 -08:00
freezer.c
futex.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-01-20 10:42:08 -08:00
futex_compat.c
groups.c
hrtimer.c	sched/deadline: Add SCHED_DEADLINE structures & implementation	2014-01-13 13:41:06 +01:00
hung_task.c	hung_task: Display every hung task warning	2014-01-25 12:13:33 +01:00
irq_work.c
itimer.c
jump_label.c
kallsyms.c
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kexec.c	kernel/kexec.c: use vscnprintf() instead of vsnprintf() in vmcoreinfo_append_str()	2014-01-27 21:02:40 -08:00
kmod.c
kprobes.c
ksysfs.c	kdump: fix exported size of vmcoreinfo note	2014-01-23 16:37:03 -08:00
kthread.c
latencytop.c
Makefile
module-internal.h
module.c	module: Add missing newline in printk call.	2014-01-21 09:59:16 +10:30
module_signing.c
notifier.c
nsproxy.c
padata.c
panic.c
params.c
pid.c
pid_namespace.c
posix-cpu-timers.c
posix-timers.c
profile.c
ptrace.c
range.c
reboot.c
relay.c
res_counter.c
resource.c
seccomp.c
signal.c	kernel/signal.c: change do_signal_stop/do_sigaction to use while_each_thread()	2014-01-23 16:37:02 -08:00
smp.c	kernel/smp.c: remove cpumask_ipi	2014-01-30 16:56:54 -08:00
smpboot.c
smpboot.h
softirq.c	Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-01-31 09:02:51 -08:00
stacktrace.c
stop_machine.c
sys.c	kernel/sys.c: k_getrusage() can use while_each_thread()	2014-01-23 16:37:02 -08:00
sys_ni.c
sysctl.c	Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-01-31 08:59:46 -08:00
sysctl_binary.c
system_certificates.S
system_keyring.c
task_work.c
taskstats.c
test_kprobes.c
time.c
timeconst.bc
timer.c	timers: Reduce __run_timers() latency for empty list	2014-02-25 12:39:00 -08:00
tracepoint.c
tsacct.c
uid16.c
up.c
user-return-notifier.c
user.c
user_namespace.c
utsname.c
utsname_sysctl.c
watchdog.c
workqueue.c	Merge branch 'for-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq	2014-01-21 17:46:31 -08:00
workqueue_internal.h