AcoSail/kernel_optimize_test
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Revert "perf_counter, x86: speed up the scheduling fast-path"

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This reverts commit b68f1d2e7a.

It is causing problems (stuck/stuttering profiling) - when mixed
NMI and non-NMI counters are used.

Cc: 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:
Ingo Molnar 2009-05-25 21:41:28 +02:00
parent a78ac32587
commit 53b441a565
1 changed files with 3 additions and 2 deletions
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5
arch/x86/kernel/cpu/perf_counter.c
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@ -293,7 +293,6 @@ static int __hw_perf_counter_init(struct perf_counter *counter)
return -EACCES;
hwc->nmi = 1;
}
perf_counters_lapic_init(hwc->nmi);
if (!hwc->irq_period)
hwc->irq_period = x86_pmu.max_period;
@ -612,6 +611,8 @@ static int x86_pmu_enable(struct perf_counter *counter)
hwc->counter_base = x86_pmu.perfctr;
}
perf_counters_lapic_init(hwc->nmi);
x86_pmu.disable(hwc, idx);
cpuc->counters[idx] = counter;
@ -1037,7 +1038,7 @@ void __init init_hw_perf_counters(void)
pr_info("... counter mask: %016Lx\n", perf_counter_mask);
perf_counters_lapic_init(1);
perf_counters_lapic_init(0);
register_die_notifier(&perf_counter_nmi_notifier);
}