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Kan Liang authored
Perf doesn't support mixed events from different PMUs (except software event) in a group. The perf stat should output <not counted>/<not supported> for all events, but it doesn't. For example, perf stat -e '{cycles,uncore_imc_5/umask=0xF,event=0x4/,instructions}' <not counted> cycles <not supported> uncore_imc_5/umask=0xF,event=0x4/ 1,024,300 instructions If perf fails to open an event, it doesn't error out directly. It will disable some features and retry, until the event is opened or all features are disabled. The disabled features will not be re-enabled. The group read is one of these features. For the example as above, the IMC event and the leader event "cycles" are from different PMUs. Opening the IMC event must fail. The group read feature must be disabled for IMC event and the followed event "instructions". The "instructions" event has the same PMU as the leader "cycles". It can be opened successfully. Since the group read feature has been disabled, the "instructions" event will be read as a single event, which definitely has a value. The group read fallback is still useful for the case which kernel doesn't support group read. It is good enough to be handled only by the leader. For the fallback request from members, it must be caused by an error. The fallback only breaks the semantics of group. Limit the group read fallback only for the leader. Committer testing: On a broadwell t450s notebook: Before: # perf stat -e '{cycles,unc_cbo_cache_lookup.read_i,instructions}' sleep 1 Performance counter stats for 'sleep 1': <not counted> cycles <not supported> unc_cbo_cache_lookup.read_i 818,206 instructions 1.003170887 seconds time elapsed Some events weren't counted. Try disabling the NMI watchdog: echo 0 > /proc/sys/kernel/nmi_watchdog perf stat ... echo 1 > /proc/sys/kernel/nmi_watchdog After: # perf stat -e '{cycles,unc_cbo_cache_lookup.read_i,instructions}' sleep 1 Performance counter stats for 'sleep 1': <not counted> cycles <not supported> unc_cbo_cache_lookup.read_i <not counted> instructions 1.001380511 seconds time elapsed Some events weren't counted. Try disabling the NMI watchdog: echo 0 > /proc/sys/kernel/nmi_watchdog perf stat ... echo 1 > /proc/sys/kernel/nmi_watchdog # Reported-by:
Andi Kleen <ak@linux.intel.com> Signed-off-by:
Kan Liang <kan.liang@linux.intel.com> Tested-by:
Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Agustin Vega-Frias <agustinv@codeaurora.org> Cc: Ganapatrao Kulkarni <ganapatrao.kulkarni@cavium.com> Cc: Jin Yao <yao.jin@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shaokun Zhang <zhangshaokun@hisilicon.com> Cc: Will Deacon <will.deacon@arm.com> Fixes: 82bf311e ("perf stat: Use group read for event groups") Link: http://lkml.kernel.org/r/1524594014-79243-3-git-send-email-kan.liang@linux.intel.comSigned-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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