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97fd9ed48ce2b807edc363bef3e817aeeb5cd5e6
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Martin Schwidefsky 97fd9ed48c timers: Cache __next_timer_interrupt result 
Each time a cpu goes to sleep on a NOHZ=y system the timer
wheel is searched for the next timer interrupt. It can take
quite a few cycles to find the next pending timer.

This patch adds a field to tvec_base that caches the result of
__next_timer_interrupt.

The hit ratio is around 80% on my thinkpad under normal use, on
a server I've seen hit ratios from 5% to 95% dependent on the
workload.

-v2: jiffies wrap fixes

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Venki Pallipadi <venkatesh.pallipadi@intel.com>
LKML-Reference: <20090721202505.7d56a079@skybase>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-04 20:28:25 +02:00
..
gcov
gcov: enable GCOV_PROFILE_ALL for x86_64
2009-06-18 13:03:58 -07:00
irq
Merge branch 'irq-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-06-20 11:30:01 -07:00
power
mm, PM/Freezer: Disable OOM killer when tasks are frozen
2009-06-16 19:47:40 -07:00
time
timekeeping: Move ktime_get() functions to timekeeping.c
2009-07-07 13:00:31 +02:00
trace
ftrace: Fix the output of profile
2009-06-26 09:25:42 +02:00
.gitignore
…
acct.c
bsdacct: fix access to invalid filp in acct_on()
2009-06-30 18:56:00 -07:00
async.c
async: Fix lack of boot-time console due to insufficient synchronization
2009-06-08 12:31:53 -07:00
audit_tree.c
Fix rule eviction order for AUDIT_DIR
2009-06-24 00:02:38 -04:00
audit_watch.c
Audit: clean up all op= output to include string quoting
2009-06-24 00:00:52 -04:00
audit.c
Fix rule eviction order for AUDIT_DIR
2009-06-24 00:02:38 -04:00
audit.h
Fix rule eviction order for AUDIT_DIR
2009-06-24 00:02:38 -04:00
auditfilter.c
Audit: clean up all op= output to include string quoting
2009-06-24 00:00:52 -04:00
auditsc.c
Fix rule eviction order for AUDIT_DIR
2009-06-24 00:02:38 -04:00
backtracetest.c
…
bounds.c
…
capability.c
…
cgroup_debug.c
debug cgroup: remove unneeded cgroup_lock
2009-04-02 19:04:54 -07:00
cgroup_freezer.c
…
cgroup.c
cgroups: forbid noprefix if mounting more than just cpuset subsystem
2009-06-18 13:03:46 -07:00
compat.c
signals: implement sys_rt_tgsigqueueinfo
2009-04-30 19:24:24 +02:00
configs.c
…
cpu.c
mm/init: cpu_hotplug_init() must be initialized before SLAB
2009-06-22 21:18:12 -07:00
cpuset.c
cpuset,mm: update tasks' mems_allowed in time
2009-06-16 19:47:31 -07:00
cred-internals.h
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cred.c
CRED: Rename cred_exec_mutex to reflect that it's a guard against ptrace
2009-05-11 08:15:36 +10:00
delayacct.c
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dma-coherent.c
…
dma.c
…
exec_domain.c
Get rid of indirect include of fs_struct.h
2009-03-31 23:00:27 -04:00
exit.c
ptrace: wait_task_zombie: do not account traced sub-threads
2009-06-19 16:46:06 -07:00
extable.c
Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-04-05 11:04:19 -07:00
fork.c
copy_process(): remove the unneeded clear_tsk_thread_flag(TIF_SIGPENDING)
2009-06-18 13:03:52 -07:00
freezer.c
…
futex_compat.c
…
futex.c
futex: request only one page from get_user_pages()
2009-06-25 14:33:46 +02:00
groups.c
groups: move code to kernel/groups.c
2009-06-16 19:47:48 -07:00
hrtimer.c
hrtimer: Remove cb_entry from struct hrtimer
2009-07-22 17:12:32 +02:00
hung_task.c
…
itimer.c
…
kallsyms.c
kernel/kallsyms.c: replace deprecated __initcall with device_initcall and fix whitespace
2009-06-09 22:37:52 +02:00
Kconfig.freezer
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Kconfig.hz
…
Kconfig.preempt
…
kexec.c
PM core: rename suspend and resume functions
2009-06-12 21:32:31 +02:00
kfifo.c
kernel/kfifo.c: replace conditional test with is_power_of_2()
2009-06-16 19:47:47 -07:00
kgdb.c
sysrq, intel_fb: fix sysrq g collision
2009-05-15 07:56:24 -05:00
kmod.c
kmod: Release sub_info on cred allocation failure.
2009-05-26 12:11:19 -07:00
kprobes.c
kprobes: fix to use text_mutex around arm/disarm kprobe
2009-05-08 16:23:48 -07:00
ksysfs.c
…
kthread.c
kthreads: rework kthread_stop()
2009-06-18 13:03:54 -07:00
latencytop.c
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lockdep_internals.h
lockdep: increase MAX_LOCKDEP_ENTRIES and MAX_LOCKDEP_CHAINS
2009-05-12 19:59:52 +02:00
lockdep_proc.c
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lockdep_states.h
…
lockdep.c
Merge branch 'linus' into tracing/core
2009-05-07 11:17:34 +02:00
Makefile
Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-06-28 11:05:04 -07:00
marker.c
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module.c
kernel: constructor support
2009-06-18 13:03:57 -07:00
mutex-debug.c
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mutex-debug.h
…
mutex.c
Merge branch 'linus' into perfcounters/core
2009-06-11 17:55:42 +02:00
mutex.h
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notifier.c
…
ns_cgroup.c
cgroups: relax ns_can_attach checks to allow attaching to grandchild cgroups
2009-04-02 19:04:53 -07:00
nsproxy.c
nsproxy: extract create_nsproxy()
2009-06-18 13:03:56 -07:00
panic.c
Fix caller information for warn_slowpath_null
2009-05-16 13:41:28 -07:00
params.c
module_param: allow 'bool' module_params to be bool, not just int.
2009-06-12 21:46:58 +09:30
perf_counter.c
Fix virt_to_phys() warnings
2009-07-06 13:57:03 -07:00
pid_namespace.c
pidns: rewrite copy_pid_ns()
2009-06-18 13:03:55 -07:00
pid.c
kmemleak: Inform kmemleak about pid_hash
2009-06-29 17:14:14 +01:00
pm_qos_params.c
…
posix-cpu-timers.c
kernel/posix-cpu-timers.c: fix sparse warning
2009-04-30 08:08:31 +02:00
posix-timers.c
…
printk.c
printk: Add KERN_DEFAULT printk log-level
2009-06-16 11:02:28 -07:00
profile.c
page allocator: do not check NUMA node ID when the caller knows the node is valid
2009-06-16 19:47:32 -07:00
ptrace.c
cred_guard_mutex: do not return -EINTR to user-space
2009-07-06 13:57:04 -07:00
rcuclassic.c
kmemtrace, rcu: fix linux/rcutree.h and linux/rcuclassic.h dependencies
2009-04-03 12:23:02 +02:00
rcupdate.c
RCU: Don't try and predeclare inline funcs as it upsets some versions of gcc
2009-04-15 13:55:14 -07:00
rcupreempt_trace.c
…
rcupreempt.c
rcu: rcu_sched_grace_period(): kill the bogus flush_signals()
2009-05-05 20:28:05 +02:00
rcutorture.c
cpumask: convert rcutorture.c
2009-03-30 22:05:16 +10:30
rcutree_trace.c
rcu: Add __rcu_pending tracing to hierarchical RCU
2009-04-14 11:33:43 +02:00
rcutree.c
rcu: Add __rcu_pending tracing to hierarchical RCU
2009-04-14 11:33:43 +02:00
rcutree.h
kmemtrace, rcu: fix rcu_tree_trace.c data structure dependencies
2009-04-03 12:23:03 +02:00
relay.c
Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-04-05 11:04:19 -07:00
res_counter.c
memcg: add interface to reset limits
2009-06-18 13:03:48 -07:00
resource.c
kernel/resource.c: fix sign extension in reserve_setup()
2009-06-30 18:56:00 -07:00
rtmutex_common.h
rt_mutex: add proxy lock routines
2009-04-06 11:14:02 +02:00
rtmutex-debug.c
…
rtmutex-debug.h
…
rtmutex-tester.c
…
rtmutex.c
trivial: fix ETIMEOUT -> ETIMEDOUT typos
2009-06-12 18:01:50 +02:00
rtmutex.h
…
rwsem.c
…
sched_clock.c
sched: Fix fallback sched_clock()'s offset when using jiffies
2009-05-09 10:08:19 +02:00
sched_cpupri.c
sched: Remove unneeded __ref tag
2009-06-17 16:08:04 +02:00
sched_cpupri.h
cpumask: remove cpumask_t from core
2009-03-30 22:05:17 +10:30
sched_debug.c
sched: Hide runqueues from direct refer at source code level
2009-06-17 18:29:42 +02:00
sched_fair.c
sched: Fix out of scope variable access in sched_slice()
2009-06-17 18:37:54 +02:00
sched_features.h
Merge branch 'locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-03-30 17:17:35 -07:00
sched_idletask.c
sched, timers: move calc_load() to scheduler
2009-05-15 15:32:45 +02:00
sched_rt.c
cpumask: alloc zeroed cpumask for static cpumask_var_ts
2009-06-09 22:30:27 +09:30
sched_stats.h
sched: remove unused fields from struct rq
2009-03-24 23:16:51 +01:00
sched.c
Merge branch 'perfcounters-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-06-20 11:29:32 -07:00
seccomp.c
x86-64: seccomp: fix 32/64 syscall hole
2009-03-02 15:41:30 -08:00
semaphore.c
…
signal.c
ptrace: do_notify_parent_cldstop: fix the wrong ->nsproxy usage
2009-06-18 13:03:52 -07:00
slow-work.c
slow-work: use round_jiffies() for thread pool's cull and OOM timers
2009-06-16 19:47:49 -07:00
smp.c
cpumask: alloc zeroed cpumask for static cpumask_var_ts
2009-06-09 22:30:27 +09:30
softirq.c
softirq: introduce statistics for softirq
2009-06-18 13:03:40 -07:00
softlockup.c
…
spinlock.c
Allow rwlocks to re-enable interrupts
2009-04-02 19:05:11 -07:00
srcu.c
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stacktrace.c
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stop_machine.c
cpumask: remove cpumask_t from core
2009-03-30 22:05:17 +10:30
sys_ni.c
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sys.c
groups: move code to kernel/groups.c
2009-06-16 19:47:48 -07:00
sysctl_check.c
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sysctl.c
Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-06-28 11:05:28 -07:00
taskstats.c
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test_kprobes.c
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time.c
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timeconst.pl
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timer.c
timers: Cache __next_timer_interrupt result
2009-08-04 20:28:25 +02:00
tracepoint.c
tracepoints: dont update zero-sized tracepoint sections
2009-03-18 19:55:00 +01:00
tsacct.c
Fix fixpoint divide exception in acct_update_integrals
2009-03-09 08:13:35 -07:00
uid16.c
…
up.c
…
user_namespace.c
Fix recursive lock in free_uid()/free_user_ns()
2009-02-27 16:26:21 -08:00
user.c
sched: delayed cleanup of user_struct
2009-06-15 21:30:23 -07:00
utsname_sysctl.c
proc_sysctl: use CONFIG_PROC_SYSCTL around ipc and utsname proc_handlers
2009-04-02 19:05:01 -07:00
utsname.c
utsns: extract creeate_uts_ns()
2009-06-18 13:03:55 -07:00
wait.c
wait: don't use __wake_up_common()
2009-04-14 17:17:16 +02:00
workqueue.c
ftrace, workqueuetrace: make workqueue tracepoints use TRACE_EVENT macro
2009-06-02 01:10:40 +02:00