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5debf02131
linux/arch/x86/events
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Namhyung Kim 5debf02131 perf/x86/intel: Fix a warning on x86_pmu_stop() with large PEBS 
The commit 3966c3feca ("x86/perf/amd: Remove need to check "running"
bit in NMI handler") introduced this.  It seems x86_pmu_stop can be
called recursively (like when it losts some samples) like below:

  x86_pmu_stop
    intel_pmu_disable_event  (x86_pmu_disable)
      intel_pmu_pebs_disable
        intel_pmu_drain_pebs_nhm  (x86_pmu_drain_pebs_buffer)
          x86_pmu_stop

While commit 35d1ce6bec ("perf/x86/intel/ds: Fix x86_pmu_stop
warning for large PEBS") fixed it for the normal cases, there's
another path to call x86_pmu_stop() recursively when a PEBS error was
detected (like two or more counters overflowed at the same time).

Like in the Kan's previous fix, we can skip the interrupt accounting
for large PEBS, so check the iregs which is set for PMI only.

Fixes: 3966c3feca ("x86/perf/amd: Remove need to check "running" bit in NMI handler")
Reported-by: John Sperbeck <jsperbeck@google.com>
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20201126110922.317681-1-namhyung@kernel.org
2020-12-03 10:00:26 +01:00
..
amd x86/events/amd/iommu: Fix sizeof mismatch 2020-10-03 16:30:56 +02:00
intel perf/x86/intel: Fix a warning on x86_pmu_stop() with large PEBS 2020-12-03 10:00:26 +01:00
zhaoxin x86/perf: Fix a typo 2020-07-22 10:22:08 +02:00
core.c These are the performance events changes for v5.10: 2020-10-12 14:14:35 -07:00
Kconfig treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Makefile perf/x86/rapl: Fix RAPL config variable bug 2020-06-02 11:52:56 +02:00
msr.c perf/x86/msr: Add Jasper Lake support 2020-09-29 09:57:02 +02:00
perf_event.h perf/x86/intel: Make anythread filter support conditional 2020-11-09 18:12:36 +01:00
probe.c perf/x86/rapl: Make perf_probe_msr() more robust and flexible 2020-05-28 07:58:55 +02:00
probe.h perf/x86: Add MSR probe interface 2019-06-24 19:28:31 +02:00
rapl.c perf/x86: fix sysfs type mismatches 2020-11-17 13:15:38 +01:00