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perf_counter: Generic per counter interrupt throttle

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Introduce a generic per counter interrupt throttle.

This uses the perf_counter_overflow() quick disable to throttle a specific
counter when its going too fast when a pmu->unthrottle() method is provided
which can undo the quick disable.

Power needs to implement both the quick disable and the unthrottle method.

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: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
LKML-Reference: <20090525153931.703093461@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2009-05-25 17:39:05 +02:00
committed by Ingo Molnar
parent 48e22d56ec
commit a78ac32587
4 changed files with 87 additions and 4 deletions
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13
arch/x86/kernel/cpu/perf_counter.c
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@@ -623,6 +623,18 @@ try_generic:
return 0;
}
static void x86_pmu_unthrottle(struct perf_counter *counter)
{
struct cpu_hw_counters *cpuc = &__get_cpu_var(cpu_hw_counters);
struct hw_perf_counter *hwc = &counter->hw;
if (WARN_ON_ONCE(hwc->idx >= X86_PMC_IDX_MAX ||
cpuc->counters[hwc->idx] != counter))
return;
x86_pmu.enable(hwc, hwc->idx);
}
void perf_counter_print_debug(void)
{
u64 ctrl, status, overflow, pmc_ctrl, pmc_count, prev_left, fixed;
@@ -1038,6 +1050,7 @@ static const struct pmu pmu = {
.enable = x86_pmu_enable,
.disable = x86_pmu_disable,
.read = x86_pmu_read,
.unthrottle = x86_pmu_unthrottle,
};
const struct pmu *hw_perf_counter_init(struct perf_counter *counter)