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

From Alexei Starovoitov <alexei.starovoitov@gmail.com>
Newsgroups linux.kernel
Subject Re: [PATCH v2] perf: Synchronously cleanup child events
Date 2016-01-27 19:00 +0100
Message-ID <qVCxQ-7c1-11@gated-at.bofh.it> (permalink)
References (5 earlier) <qV438-6Ko-5@gated-at.bofh.it> <qVevy-6B0-47@gated-at.bofh.it> <qVfBh-7mT-37@gated-at.bofh.it> <qVlnk-385-15@gated-at.bofh.it> <qVv3k-1Ak-9@gated-at.bofh.it>
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On Wed, Jan 27, 2016 at 10:58:22AM +0100, Peter Zijlstra wrote:
> 
> > Meaning there gotta be always a user space process
> > that will be holding perf_event FDs.
> 
> By using fget() the BPF array thing will hold the FDs, right? I mean
> once you do a full fget() userspace can go and kill itself, the struct
> file will persists.

Right. I mistakenly thought that fget() will prevent the task
from freeing or some fs/directory resources will be hanging.
It's from anon_inode. So all good. All concerns cleared.

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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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