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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. -----BEGIN PGP SIGNATURE----- iQJHBAABCgAxFiEEQp8+kY+LLUocC4bMphj1TA10mKEFAl/M1lwTHHRnbHhAbGlu dXRyb25peC5kZQAKCRCmGPVMDXSYoeKPEACo/xfvFgp/rlSIjh12OW7XTyKqKMVq C8TvMFbzn3Pzx89RyJctyyi1d5xYz6ic3uXkV0yGJ1g9fkJdzhgCY/byoTd/nWor /r6RRtw5Ah3werXlESbZWTb6691eqGO4TpWZMAwdDeV1eRAc7ZSoOLJiY0o4HVWd AE2aX9/psikHBAeMzMHn5W4pELl0s6s6aX9OJLFFZeroA3UW3bWOHu8o/iylmld9 wnQPvGe+kk35ZBza8/kbBJv3ZasUBPXy1+9Z1p1aE8dmd+HrYnw9vS3El9dgtX1Y ADKttAD3S3j/PbBOXOnIRoSTM7Vvc5gviLyPfw6erBIMtw/OBFSrRD7IbVJpyZmn yysBgacu6pzeLXRZ4ZktQ2GPeAgdiZwsqwuvuQGd5t1zfdNkZEEI7aK87CrHCYOk zMt7vNK/q5xF9wt9C3cYzka/Sp7UA10zqP31/fv2fOZb4dcANTtm9reS/fwqd67X HYhYiks4z1wxqTOf76wBpXau9ZtQLb20MmC3S6IknDF39pODO1sGcWMJSB0AgYUE 3125ZTxrmlgv+U7S5qBHKB5ot5wvNUexiDD0g0o2N9x4dCQqErmvwUDWWUoqq35A g4tqODudwM4aU05leWO/piZEBr4xxAiRke9r8WJZNHAo0C7yHjjmXRtZYDkSf2pV U0gyy4dWTsXKKw== =YbCo -----END PGP SIGNATURE----- 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
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commit
9f6b28d498
1 changed files with 2 additions and 2 deletions
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@ -1916,7 +1916,7 @@ static void intel_pmu_drain_pebs_nhm(struct pt_regs *iregs, struct perf_sample_d
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* that caused the PEBS record. It's called collision.
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* If collision happened, the record will be dropped.
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*/
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if (p->status != (1ULL << bit)) {
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if (pebs_status != (1ULL << bit)) {
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for_each_set_bit(i, (unsigned long *)&pebs_status, size)
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error[i]++;
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continue;
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@ -1940,7 +1940,7 @@ static void intel_pmu_drain_pebs_nhm(struct pt_regs *iregs, struct perf_sample_d
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if (error[bit]) {
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perf_log_lost_samples(event, error[bit]);
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if (perf_event_account_interrupt(event))
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if (iregs && perf_event_account_interrupt(event))
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x86_pmu_stop(event, 0);
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}
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