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perf, x86: Fixup the PEBS handler for Core2 cpus

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Pull the core handler in line with the nhm one, also make sure we always
drain the buffer.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: paulus@samba.org
Cc: eranian@google.com
Cc: robert.richter@amd.com
Cc: fweisbec@gmail.com
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2010-03-09 11:41:02 +01:00 committed by Ingo Molnar
parent 7645a24cbd
commit d80c7502ff
1 changed files with 24 additions and 14 deletions
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38
arch/x86/kernel/cpu/perf_event_intel_ds.c
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@ -472,20 +472,39 @@ static void intel_pmu_drain_pebs_core(struct pt_regs *iregs)
struct pt_regs regs;
int n;
if (!event || !ds || !x86_pmu.pebs)
if (!ds || !x86_pmu.pebs)
return;
at = (struct pebs_record_core *)(unsigned long)ds->pebs_buffer_base;
top = (struct pebs_record_core *)(unsigned long)ds->pebs_index;
if (top <= at)
/*
* Whatever else happens, drain the thing
*/
ds->pebs_index = ds->pebs_buffer_base;
if (!test_bit(0, cpuc->active_mask))
return;
ds->pebs_index = ds->pebs_buffer_base;
WARN_ON_ONCE(!event);
if (!event->attr.precise)
return;
n = top - at;
if (n <= 0)
return;
if (!intel_pmu_save_and_restart(event))
return;
/*
* Should not happen, we program the threshold at 1 and do not
* set a reset value.
*/
WARN_ON_ONCE(n > 1);
at += n - 1;
perf_sample_data_init(&data, 0);
data.period = event->hw.last_period;
@ -495,14 +514,6 @@ static void intel_pmu_drain_pebs_core(struct pt_regs *iregs)
data.raw = &raw;
}
n = top - at;
/*
* Should not happen, we program the threshold at 1 and do not
* set a reset value.
*/
WARN_ON_ONCE(n > 1);
/*
* We use the interrupt regs as a base because the PEBS record
* does not contain a full regs set, specifically it seems to
@ -545,12 +556,11 @@ static void intel_pmu_drain_pebs_nhm(struct pt_regs *iregs)
at = (struct pebs_record_nhm *)(unsigned long)ds->pebs_buffer_base;
top = (struct pebs_record_nhm *)(unsigned long)ds->pebs_index;
if (top <= at)
return;
ds->pebs_index = ds->pebs_buffer_base;
n = top - at;
if (n <= 0)
return;
/*
* Should not happen, we program the threshold at 1 and do not