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7fc23a5380797012e92a9633169440f2f4a21253
linux/kernel
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Peter Zijlstra 7fc23a5380 perf_counter: optimize perf_counter_task_tick() 
perf_counter_task_tick() does way too much work to find out
there's nothing to do. Provide an easy short-circuit for the
normal case where there are no counters on the system.

[ Impact: micro-optimization ]

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
LKML-Reference: <20090508170028.750619201@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-05-08 20:36:57 +02:00
..
irq
x86, irq: Remove IRQ_DISABLED check in process context IRQ move
2009-04-14 15:21:13 +02:00
power
PM/Hibernate: Fix waiting for image device to appear on resume
2009-04-24 15:31:30 -07:00
time
clocksource: add enable() and disable() callbacks
2009-04-21 13:41:47 -07:00
trace
tracing: Fix branch tracer header
2009-04-14 02:30:36 +02:00
.gitignore
…
acct.c
[CVE-2009-0029] System call wrappers part 04
2009-01-14 14:15:19 +01:00
async.c
async: remove the temporary (2.6.29) "async is off by default" code
2009-03-28 13:05:30 -07:00
audit_tree.c
No need for crossing to mountpoint in audit_tag_tree()
2009-04-20 23:01:15 -04:00
audit.c
Audit: remove spaces from audit_log_d_path
2009-04-05 13:49:04 -04:00
audit.h
fixing audit rule ordering mess, part 1
2009-01-04 15:14:41 -05:00
auditfilter.c
make the e->rule.xxx shorter in kernel auditfilter.c
2009-04-05 13:40:33 -04:00
auditsc.c
Audit: remove spaces from audit_log_d_path
2009-04-05 13:49:04 -04:00
backtracetest.c
…
bounds.c
…
capability.c
[CVE-2009-0029] System call wrappers part 04
2009-01-14 14:15:19 +01:00
cgroup_debug.c
debug cgroup: remove unneeded cgroup_lock
2009-04-02 19:04:54 -07:00
cgroup_freezer.c
freezer_cg: disable writing freezer.state of root cgroup
2008-11-12 17:17:16 -08:00
cgroup.c
memcg: fix OOM killer under memcg
2009-04-02 19:04:55 -07:00
compat.c
signals: implement sys_rt_tgsigqueueinfo
2009-04-30 19:24:24 +02:00
configs.c
kernel/configs.c: remove useless comments
2008-10-20 08:52:34 -07:00
cpu.c
cpumask: use set_cpu_active in init/main.c
2009-03-30 22:05:12 +10:30
cpuset.c
cpusets: prevent PF_THREAD_BOUND tasks from attaching to non-root cpusets
2009-04-02 19:04:57 -07:00
cred-internals.h
CRED: Inaugurate COW credentials
2008-11-14 10:39:23 +11:00
cred.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6
2009-01-09 13:59:25 -08:00
delayacct.c
schedstat: consolidate per-task cpu runtime stats
2008-12-18 13:54:01 +01:00
dma-coherent.c
dma-coherent: Restore dma_alloc_from_coherent() large alloc fall back policy.
2009-01-21 18:51:53 +09:00
dma.c
kernel/dma.c: remove a CVS keyword
2008-10-16 11:21:30 -07:00
exec_domain.c
Get rid of indirect include of fs_struct.h
2009-03-31 23:00:27 -04:00
exit.c
Merge commit 'v2.6.30-rc1' into perfcounters/core
2009-04-08 10:35:30 +02:00
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
Merge branch 'linus' into perfcounters/core
2009-04-29 14:47:05 +02:00
freezer.c
freezer_cg: use thaw_process() in unfreeze_cgroup()
2008-10-30 11:38:45 -07:00
futex_compat.c
CRED: Use RCU to access another task's creds and to release a task's own creds
2008-11-14 10:39:19 +11:00
futex.c
futex: comment requeue key reference semantics
2009-04-02 23:39:53 +02:00
hrtimer.c
hrtimer: fix rq->lock inversion (again)
2009-03-31 14:52:52 +02:00
hung_task.c
softlockup: ensure the task has been switched out once
2009-02-11 11:04:16 +01:00
itimer.c
timers: split process wide cpu clocks/timers
2009-02-05 13:04:33 +01:00
kallsyms.c
Ksplice: Add functions for walking kallsyms symbols
2009-03-31 13:05:32 +10:30
Kconfig.freezer
container freezer: implement freezer cgroup subsystem
2008-10-20 08:52:34 -07:00
Kconfig.hz
…
Kconfig.preempt
rcu: provide RCU options on non-preempt architectures too
2008-12-25 09:31:28 +01:00
kexec.c
kexec: vmcoreinfo_data[] can become static
2009-04-02 19:05:04 -07:00
kfifo.c
…
kgdb.c
kgdb: call touch_softlockup_watchdog on resume
2008-10-06 13:50:59 -05:00
kmod.c
module: create a request_module_nowait()
2009-03-31 13:05:35 +10:30
kprobes.c
kprobes: support per-kprobe disabling
2009-04-07 08:31:08 -07:00
ksysfs.c
kernel/ksysfs.c:fix dependence on CONFIG_NET
2009-01-06 10:44:31 -08:00
kthread.c
kthread: move sched-realeted initialization from kthreadd context
2009-04-09 09:50:37 +09:30
latencytop.c
sched, latencytop: incorporate review feedback from Andrew Morton
2009-02-11 10:18:04 +01:00
lockdep_internals.h
lockdep: get_user_chars() redo
2009-02-14 23:28:22 +01:00
lockdep_proc.c
lockstat: warn about disabled lock debugging
2009-02-14 23:28:28 +01:00
lockdep_states.h
lockdep: move state bit definitions around
2009-02-14 23:27:59 +01:00
lockdep.c
lockdep: more robust lockdep_map init sequence
2009-04-17 18:00:00 +02:00
Makefile
Merge commit 'v2.6.30-rc1' into perfcounters/core
2009-04-08 10:35:30 +02:00
marker.c
markers/tracpoints: fix non-modular build
2008-11-16 09:52:03 +01:00
module.c
async: Fix module loading async-work regression
2009-04-11 12:44:49 -07:00
mutex-debug.c
mutex: implement adaptive spinning
2009-01-14 18:09:02 +01:00
mutex-debug.h
mutex: implement adaptive spinning
2009-01-14 18:09:02 +01:00
mutex.c
Merge branch 'core/locking' into perfcounters/core
2009-05-06 08:47:26 +02:00
mutex.h
mutex: implement adaptive spinning
2009-01-14 18:09:02 +01:00
notifier.c
Merge commit 'v2.6.28-rc6' into core/debug
2008-11-26 08:22:50 +01:00
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
User namespaces: set of cleanups (v2)
2008-11-24 18:57:41 -05:00
panic.c
locking: clarify kernel-taint warning message
2009-04-23 09:36:52 +02:00
params.c
param: fix charp parameters set via sysfs
2009-03-31 13:05:30 +10:30
perf_counter.c
perf_counter: optimize perf_counter_task_tick()
2009-05-08 20:36:57 +02:00
pid_namespace.c
signals: zap_pid_ns_process() should use force_sig()
2009-04-02 19:04:58 -07:00
pid.c
pids: refactor vnr/nr_ns helpers to make them safe
2009-04-02 19:05:02 -07:00
pm_qos_params.c
…
posix-cpu-timers.c
Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-04-09 10:37:28 -07:00
posix-timers.c
[CVE-2009-0029] System call wrappers part 05
2009-01-14 14:15:20 +01:00
printk.c
Merge branch 'printk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-04-05 10:23:25 -07:00
profile.c
profiling: fix broken profiling regression
2009-02-10 00:50:37 +01:00
ptrace.c
ptrace: ptrace_attach: fix the usage of ->cred_exec_mutex
2009-04-27 20:30:51 +10:00
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
"Tree RCU": scalable classic RCU implementation
2008-12-18 21:56:04 +01:00
rcupreempt.c
kmemtrace, rcu: fix rcupreempt.c data structure dependencies
2009-04-03 12:23:04 +02:00
rcutorture.c
cpumask: convert rcutorture.c
2009-03-30 22:05:16 +10:30
rcutree_trace.c
rcu: Make hierarchical RCU less IPI-happy
2009-04-14 11:31:50 +02:00
rcutree.c
rcu: Make hierarchical RCU less IPI-happy
2009-04-14 11:31:50 +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: memory cgroup resource counters for hierarchy
2009-01-08 08:31:05 -08:00
resource.c
Remove 'recurse into child resources' logic from 'reserve_region_with_split()'
2009-04-18 21:44:24 -07:00
rtmutex_common.h
…
rtmutex-debug.c
…
rtmutex-debug.h
…
rtmutex-tester.c
…
rtmutex.c
locking, rtmutex.c: Documentation cleanup
2009-04-29 23:20:17 +02:00
rtmutex.h
…
rwsem.c
…
sched_clock.c
Merge branch 'tracing/core-v2' into tracing-for-linus
2009-04-02 00:49:02 +02:00
sched_cpupri.c
sched_rt: don't allocate cpumask in fastpath
2009-04-01 13:24:51 +02:00
sched_cpupri.h
cpumask: remove cpumask_t from core
2009-03-30 22:05:17 +10:30
sched_debug.c
sched: remove unused fields from struct rq
2009-03-24 23:16:51 +01:00
sched_fair.c
Merge branch 'sched/urgent'; commit 'v2.6.29-rc5' into sched/core
2009-02-15 21:15:16 +01:00
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: add CONFIG_SMP consistency
2008-10-22 10:01:52 +02:00
sched_rt.c
Merge commit 'v2.6.30-rc1' into sched/urgent
2009-04-08 17:26:00 +02:00
sched_stats.h
sched: remove unused fields from struct rq
2009-03-24 23:16:51 +01:00
sched.c
perf_counter: initialize the per-cpu context earlier
2009-05-04 19:30:32 +02:00
seccomp.c
x86-64: seccomp: fix 32/64 syscall hole
2009-03-02 15:41:30 -08:00
semaphore.c
…
signal.c
signals: implement sys_rt_tgsigqueueinfo
2009-04-30 19:24:24 +02:00
slow-work.c
Delete slow-work timers properly
2009-04-24 07:47:59 -07:00
smp.c
generic-ipi: eliminate WARN_ON()s during oops/panic
2009-03-13 10:47:34 +01:00
softirq.c
kernel/softirq.c: fix sparse warning
2009-04-17 01:57:54 +02:00
softlockup.c
softlockup: decouple hung tasks check from softlockup detection
2009-01-16 14:06:04 +01:00
spinlock.c
Allow rwlocks to re-enable interrupts
2009-04-02 19:05:11 -07:00
srcu.c
…
stacktrace.c
stacktrace: provide save_stack_trace_tsk() weak alias
2008-12-25 11:44:43 +01:00
stop_machine.c
cpumask: remove cpumask_t from core
2009-03-30 22:05:17 +10:30
sys_ni.c
Merge commit 'v2.6.29-rc2' into perfcounters/core
2009-01-21 16:37:27 +01:00
sys.c
Merge branch 'linus' into perfcounters/core
2009-04-29 14:47:05 +02:00
sysctl_check.c
net: add ARP notify option for devices
2009-02-01 01:04:33 -08:00
sysctl.c
perf_counter: provide an mlock threshold
2009-05-05 20:18:32 +02:00
taskstats.c
cpumask: convert rest of files in kernel/
2009-01-01 10:12:28 +10:30
test_kprobes.c
kprobes: add tests for register_kprobes
2009-01-06 15:59:20 -08:00
time.c
[CVE-2009-0029] System call wrappers part 01
2009-01-14 14:15:18 +01:00
timeconst.pl
…
timer.c
Merge branch 'linus' into perfcounters/core
2009-04-29 14:47:05 +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
[CVE-2009-0029] System call wrappers part 19
2009-01-14 14:15:26 +01:00
up.c
smp_call_function_single(): be slightly less stupid, fix #2
2009-01-12 16:04:37 +01:00
user_namespace.c
Fix recursive lock in free_uid()/free_user_ns()
2009-02-27 16:26:21 -08:00
user.c
Merge branch 'master' into next
2009-03-24 10:52:46 +11:00
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
…
wait.c
wait: prevent exclusive waiter starvation
2009-02-05 12:56:48 -08:00
workqueue.c
work_on_cpu(): rewrite it to create a kernel thread on demand
2009-04-09 09:50:37 +09:30