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Date: Fri, 22 Jan 2016 11:44:03 -0800 From: Alexei Starovoitov <alexei.starovoitov@...il.com> To: Peter Zijlstra <peterz@...radead.org> Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org, vince@...ter.net, eranian@...gle.com, Arnaldo Carvalho de Melo <acme@...radead.org>, Jiri Olsa <jolsa@...nel.org> Subject: Re: [PATCH v2] perf: Synchronously cleanup child events On Fri, Jan 22, 2016 at 01:38:47PM +0100, Peter Zijlstra wrote: > On Fri, Jan 22, 2016 at 01:35:40PM +0200, Alexander Shishkin wrote: > > Peter Zijlstra <peterz@...radead.org> writes: > > > > > So I think there's a number of problems still :-( I've been looking at how perf_event->owner is handled and couldn't figure out how you deal with the case of passing perf_event_fd via scm_rights. It seems one process can open an event, pass it to another process, but when current process exists owner will still point to dead task, since refcount > 0. Which part am I missing?
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