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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-12-06 11:20:18 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-12-06 11:20:18 -0800 |
| commit | 9f6b28d498ba084dff970ad95796642f804ffcd8 (patch) | |
| tree | c95a19440d177dfe023feb54259e0a44375bd4b3 | |
| parent | 592d9a0835c97f54744a7c3ce845c16735c0ab14 (diff) | |
| parent | fc17db8aa4c53cbd2d5469bb0521ea0f0a6dbb27 (diff) | |
| download | chrome-platform-9f6b28d498ba084dff970ad95796642f804ffcd8.tar.gz | |
Merge tag 'perf-urgent-2020-12-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf fixes from Thomas Gleixner:
"Two fixes for performance monitoring on X86:
- Add recursion protection to another callchain invoked from
x86_pmu_stop() which can recurse back into x86_pmu_stop(). The
first attempt to fix this missed this extra code path.
- Use the already filtered status variable to check for PEBS counter
overflow bits and not the unfiltered full status read from
IA32_PERF_GLOBAL_STATUS which can have unrelated bits check which
would be evaluated incorrectly"
* tag 'perf-urgent-2020-12-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/x86/intel: Check PEBS status correctly
perf/x86/intel: Fix a warning on x86_pmu_stop() with large PEBS
| -rw-r--r-- | arch/x86/events/intel/ds.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c index b47cc4226934b3..485c5066f8b8c8 100644 --- a/arch/x86/events/intel/ds.c +++ b/arch/x86/events/intel/ds.c @@ -1916,7 +1916,7 @@ static void intel_pmu_drain_pebs_nhm(struct pt_regs *iregs, struct perf_sample_d * that caused the PEBS record. It's called collision. * If collision happened, the record will be dropped. */ - if (p->status != (1ULL << bit)) { + if (pebs_status != (1ULL << bit)) { for_each_set_bit(i, (unsigned long *)&pebs_status, size) error[i]++; continue; @@ -1940,7 +1940,7 @@ static void intel_pmu_drain_pebs_nhm(struct pt_regs *iregs, struct perf_sample_d if (error[bit]) { perf_log_lost_samples(event, error[bit]); - if (perf_event_account_interrupt(event)) + if (iregs && perf_event_account_interrupt(event)) x86_pmu_stop(event, 0); } |