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| author | Andi Kleen <ak@linux.intel.com> | 2015-12-03 13:22:19 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-01-06 11:15:30 +0100 |
| commit | 957ea1fdbcdb909e1540f06f06f1a9ce6e696efa (patch) | |
| tree | dc17d7f9faa587fa7be909bf6eb648537fe70bcb /arch/x86/kernel/cpu | |
| parent | 7b648018f628eee73450b71dc68ebb3c3865465e (diff) | |
| download | linux-957ea1fdbcdb909e1540f06f06f1a9ce6e696efa.tar.bz2 | |
perf/x86: Remove warning for zero PEBS status
The recent commit:
75f80859b130 ("perf/x86/intel/pebs: Robustify PEBS buffer drain")
causes lots of warnings on different CPUs before Skylake
when running PEBS intensive workloads.
They can have a zero status field in the PEBS record when
PEBS is racing with clearing of GLOBAl_STATUS.
This also can cause hangs (it seems there are still
problems with printk in NMI).
Disable the warning, but still ignore the record.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: http://lkml.kernel.org/r/1449177740-5422-1-git-send-email-andi@firstfloor.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/cpu')
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event_intel_ds.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c index 5db1c7755548..0e3a9c73187d 100644 --- a/arch/x86/kernel/cpu/perf_event_intel_ds.c +++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c @@ -1232,10 +1232,7 @@ static void intel_pmu_drain_pebs_nhm(struct pt_regs *iregs) bit = find_first_bit((unsigned long *)&pebs_status, x86_pmu.max_pebs_events); - if (WARN(bit >= x86_pmu.max_pebs_events, - "PEBS record without PEBS event! status=%Lx pebs_enabled=%Lx active_mask=%Lx", - (unsigned long long)p->status, (unsigned long long)cpuc->pebs_enabled, - *(unsigned long long *)cpuc->active_mask)) + if (bit >= x86_pmu.max_pebs_events) continue; /* |