Commit-ID: 957ea1fdbcdb909e1540f06f06f1a9ce6e696efa
Gitweb: http://git.kernel.org/tip/957ea1fdbcdb909e1540f06f06f1a9ce6e696efa
Author: Andi Kleen <ak@xxxxxxxxxxxxxxx>
AuthorDate: Thu, 3 Dec 2015 13:22:19 -0800
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Wed, 6 Jan 2016 11:15:30 +0100
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@xxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Vince Weaver <vincent.weaver@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1449177740-5422-1-git-send-email-andi@xxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/kernel/cpu/perf_event_intel_ds.c | 5 +----
1 file changed, 1 insertion(+), 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 5db1c77..0e3a9c7 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;
/*
--
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