redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

perf, x86: Fix pebs drains 

I overlooked the perf_disable()/perf_enable() calls in
intel_pmu_handle_irq(), (pointed out by Markus) so we should not
explicitly disable_all/enable_all pebs counters in the drain functions,
these are already disabled and enabling them early is confusing.

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>
hifive-unleashed-5.1
Peter Zijlstra 2010-03-06 13:26:11 +01:00 committed by Ingo Molnar
parent cc7f00820b
commit 8f4aebd2be
1 changed files with 3 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
arch/x86/kernel/cpu/perf_event_intel_ds.c
View File

@ -476,18 +476,16 @@ static void intel_pmu_drain_pebs_core(struct pt_regs *iregs)
if (!event || !ds || !x86_pmu.pebs)
return;
intel_pmu_pebs_disable_all();
at = (struct pebs_record_core *)(unsigned long)ds->pebs_buffer_base;
top = (struct pebs_record_core *)(unsigned long)ds->pebs_index;
if (top <= at)
goto out;
return;
ds->pebs_index = ds->pebs_buffer_base;
if (!intel_pmu_save_and_restart(event))
goto out;
return;
perf_sample_data_init(&data, 0);
data.period = event->hw.last_period;
@ -528,9 +526,6 @@ static void intel_pmu_drain_pebs_core(struct pt_regs *iregs)
if (perf_event_overflow(event, 1, &data, &regs))
x86_pmu_stop(event);
out:
intel_pmu_pebs_enable_all();
}
static void intel_pmu_drain_pebs_nhm(struct pt_regs *iregs)
@ -547,13 +542,11 @@ static void intel_pmu_drain_pebs_nhm(struct pt_regs *iregs)
if (!ds || !x86_pmu.pebs)
return;
intel_pmu_pebs_disable_all();
at = (struct pebs_record_nhm *)(unsigned long)ds->pebs_buffer_base;
top = (struct pebs_record_nhm *)(unsigned long)ds->pebs_index;
if (top <= at)
goto out;
return;
ds->pebs_index = ds->pebs_buffer_base;
@ -604,8 +597,6 @@ static void intel_pmu_drain_pebs_nhm(struct pt_regs *iregs)
if (perf_event_overflow(event, 1, &data, &regs))
x86_pmu_stop(event);
}
out:
intel_pmu_pebs_enable_all();
}
/*