Messages in this thread | | | From | Ian Rogers <> | Date | Fri, 17 Apr 2020 14:31:04 -0700 | Subject | Re: [PATCH] perf/core: fix parent pid/tid in task exit events |
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On Fri, Apr 17, 2020 at 11:45 AM Peter Zijlstra <peterz@infradead.org> wrote: > > On Fri, Apr 17, 2020 at 11:28:42AM -0700, Ian Rogers wrote: > > Current logic yields the child task as the parent. > > > > Before: > > $ perf record bash -c "perf list > /dev/null" > > $ perf script -D |grep 'FORK\|EXIT' > > 4387036190981094 0x5a70 [0x30]: PERF_RECORD_FORK(10472:10472):(10470:10470) > > 4387036606207580 0xf050 [0x30]: PERF_RECORD_EXIT(10472:10472):(10472:10472) > > 4387036607103839 0x17150 [0x30]: PERF_RECORD_EXIT(10470:10470):(10470:10470) > > ^ > > Note the repeated values here -------------------/ > > > > After: > > 383281514043 0x9d8 [0x30]: PERF_RECORD_FORK(2268:2268):(2266:2266) > > 383442003996 0x2180 [0x30]: PERF_RECORD_EXIT(2268:2268):(2266:2266) > > 383451297778 0xb70 [0x30]: PERF_RECORD_EXIT(2266:2266):(2265:2265) > > > > Fixes: .... ?
Fixes: 94d5d1b2d891 ("perf_counter: Report the cloning task as parent on perf_counter_fork()")
Sorry, re-sending as plain-text was disabled on the message and so it bounced on lkml. Took some digging to find the original commit :-)
Thanks, Ian
> > > Reported-by: KP Singh <kpsingh@google.com> > > Signed-off-by: Ian Rogers <irogers@google.com>
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