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perf_counter: Optimize disable of time based sw counters

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Currently we call hrtimer_cancel() unconditionally on disable of time based
software counters. Avoid when possible.

[ Impact: micro-optimize the code ]

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
LKML-Reference: <20090520102553.388185031@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-05-20 12:21:21 +02:00 committed by Ingo Molnar
parent 26b119bc81
commit b986d7ec0f
1 changed files with 4 additions and 2 deletions
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6
kernel/perf_counter.c
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@ -2716,7 +2716,8 @@ static int cpu_clock_perf_counter_enable(struct perf_counter *counter)
static void cpu_clock_perf_counter_disable(struct perf_counter *counter) static void cpu_clock_perf_counter_disable(struct perf_counter *counter)
{ {
hrtimer_cancel(&counter->hw.hrtimer); if (counter->hw.irq_period)
hrtimer_cancel(&counter->hw.hrtimer);
cpu_clock_perf_counter_update(counter); cpu_clock_perf_counter_update(counter);
} }
@ -2767,7 +2768,8 @@ static int task_clock_perf_counter_enable(struct perf_counter *counter)
static void task_clock_perf_counter_disable(struct perf_counter *counter) static void task_clock_perf_counter_disable(struct perf_counter *counter)
{ {
hrtimer_cancel(&counter->hw.hrtimer); if (counter->hw.irq_period)
hrtimer_cancel(&counter->hw.hrtimer);
task_clock_perf_counter_update(counter, counter->ctx->time); task_clock_perf_counter_update(counter, counter->ctx->time);
} }