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Re: [PATCH v2] perf: Synchronously cleanup child events

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [PATCH v2] perf: Synchronously cleanup child events
Date 2016-01-20 09:10 +0100
Message-ID <qSW01-3Gv-3@gated-at.bofh.it> (permalink)
References <qSji2-1ZW-23@gated-at.bofh.it> <qSGeC-1c0-13@gated-at.bofh.it> <qSKLh-4he-33@gated-at.bofh.it> <qSV3Y-35h-25@gated-at.bofh.it>
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On Wed, Jan 20, 2016 at 09:04:28AM +0200, Alexander Shishkin wrote:
> Peter Zijlstra <peterz@infradead.org> writes:

> > The most obvious place that generates such magical references would be
> > the bpf arraymap doing perf_event_get() on things. There are a few other
> > places that take temp references (perf_mmap_close), but those are
> > 'short' lived and while ugly will not cause massive grief.
> 
> We won't get to perf_release() before we're done with perf_mmap_close(),
> so that one's not really a problem.

Only for the file we mmap()'ed, the events we've attached through
IOC_SET_OUTPUT will not have a file reference from the mmap().

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Thread

[PATCH] perf: Cleanup user's child events Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-01-15 12:30 +0100
  Re: [PATCH] perf: Cleanup user's child events Peter Zijlstra <peterz@infradead.org> - 2016-01-15 14:00 +0100
    Re: [PATCH] perf: Cleanup user's child events Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-01-15 14:10 +0100
      Re: [PATCH] perf: Cleanup user's child events Peter Zijlstra <peterz@infradead.org> - 2016-01-15 14:10 +0100
        [PATCH] perf: Synchronously cleanup child events Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-01-15 15:10 +0100
          Re: [PATCH] perf: Synchronously cleanup child events Peter Zijlstra <peterz@infradead.org> - 2016-01-15 19:00 +0100
            Re: [PATCH] perf: Synchronously cleanup child events Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-01-18 13:20 +0100
            Re: [PATCH] perf: Synchronously cleanup child events Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-01-18 13:40 +0100
              Re: [PATCH] perf: Synchronously cleanup child events Peter Zijlstra <peterz@infradead.org> - 2016-01-18 15:50 +0100
                [PATCH v2] perf: Synchronously cleanup child events Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-01-19 16:20 +0100
                Re: [PATCH v2] perf: Synchronously cleanup child events Peter Zijlstra <peterz@infradead.org> - 2016-01-19 21:10 +0100
                Re: [PATCH v2] perf: Synchronously cleanup child events Peter Zijlstra <peterz@infradead.org> - 2016-01-19 21:10 +0100
                Re: [PATCH v2] perf: Synchronously cleanup child events Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2016-01-19 23:00 +0100
                Re: [PATCH v2] perf: Synchronously cleanup child events Peter Zijlstra <peterz@infradead.org> - 2016-01-20 09:40 +0100
                Re: [PATCH v2] perf: Synchronously cleanup child events Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2016-01-21 06:00 +0100
                Re: [PATCH v2] perf: Synchronously cleanup child events Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-01-20 08:10 +0100
                Re: [PATCH v2] perf: Synchronously cleanup child events Peter Zijlstra <peterz@infradead.org> - 2016-01-20 09:10 +0100
                Re: [PATCH v2] perf: Synchronously cleanup child events Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-01-22 12:40 +0100
                Re: [PATCH v2] perf: Synchronously cleanup child events Peter Zijlstra <peterz@infradead.org> - 2016-01-22 13:20 +0100
                Re: [PATCH v2] perf: Synchronously cleanup child events Peter Zijlstra <peterz@infradead.org> - 2016-01-22 13:40 +0100
                Re: [PATCH v2] perf: Synchronously cleanup child events Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2016-01-22 20:50 +0100
                Re: [PATCH v2] perf: Synchronously cleanup child events Peter Zijlstra <peterz@infradead.org> - 2016-01-25 12:50 +0100
                Re: [PATCH v2] perf: Synchronously cleanup child events Peter Zijlstra <peterz@infradead.org> - 2016-01-25 16:00 +0100
                Re: [PATCH v2] perf: Synchronously cleanup child events Peter Zijlstra <peterz@infradead.org> - 2016-01-25 22:10 +0100
                Re: [PATCH v2] perf: Synchronously cleanup child events Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2016-01-26 06:10 +0100
                Re: [PATCH v2] perf: Synchronously cleanup child events Peter Zijlstra <peterz@infradead.org> - 2016-01-26 17:20 +0100
                Re: [PATCH v2] perf: Synchronously cleanup child events Peter Zijlstra <peterz@infradead.org> - 2016-01-26 18:30 +0100
                Re: [PATCH v2] perf: Synchronously cleanup child events Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2016-01-27 00:40 +0100
                Re: [PATCH v2] perf: Synchronously cleanup child events Peter Zijlstra <peterz@infradead.org> - 2016-01-27 11:00 +0100
                Re: [PATCH v2] perf: Synchronously cleanup child events Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2016-01-27 19:00 +0100
          Re: [PATCH] perf: Synchronously cleanup child events Ingo Molnar <mingo@kernel.org> - 2016-01-19 08:50 +0100

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