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From: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Stephane Eranian <eranian@google.com>,
	Namhyung Kim <namhyung@gmail.com>,
	LKML <linux-kernel@vger.kernel.org>, Jiri Olsa <jolsa@kernel.org>,
	Namhyung Kim <namhyung@kernel.org>,
	Adrian Hunter <adrian.hunter@intel.com>,
	"ak@linux.intel.com" <ak@linux.intel.com>
Subject: Re: [RFC] perf record: missing buildid for callstack modules
Date: Tue, 12 Jan 2016 13:08:15 +0000	[thread overview]
Message-ID: <20160112130815.77c1a4fa@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <20160112113521.GC6357@twins.programming.kicks-ass.net>

> And we cannot, at mmap() time, 'assume' the file is ELF and try prodding
> into it to find a buildid or whatnot.

And you cannot at any time assume that something like NFS won't change
the page contents under you. In fact it's valid (but completely insane)
to use MAP_DISCARD to throw away part of your program and page it back in
again so that a daemon on the other side of the NFS can change the code
you are executing 8)

Alan

  parent reply	other threads:[~2016-01-12 13:09 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-07 21:56 [RFC] perf record: missing buildid for callstack modules Stephane Eranian
2016-01-07 21:57 ` Andi Kleen
2016-01-07 22:00   ` Stephane Eranian
2016-01-07 21:59 ` Arnaldo Carvalho de Melo
2016-01-07 22:00   ` Stephane Eranian
2016-01-07 22:47     ` Namhyung Kim
2016-01-07 23:47       ` Arnaldo Carvalho de Melo
2016-01-08 18:01         ` Stephane Eranian
2016-01-08 18:19           ` Arnaldo Carvalho de Melo
2016-01-11 17:30             ` Peter Zijlstra
2016-01-11 18:22               ` Arnaldo Carvalho de Melo
2016-01-11 20:06                 ` Stephane Eranian
2016-01-12 10:39               ` Ingo Molnar
2016-01-12 11:35                 ` Peter Zijlstra
2016-01-12 12:18                   ` Ingo Molnar
2016-01-12 13:40                     ` Peter Zijlstra
2016-01-12 14:38                       ` Arnaldo Carvalho de Melo
2016-01-12 15:34                         ` Peter Zijlstra
2016-01-12 15:48                           ` Arnaldo Carvalho de Melo
2016-01-12 16:10                             ` Peter Zijlstra
2016-01-12 16:27                               ` Peter Zijlstra
2016-01-12 17:15                                 ` Arnaldo Carvalho de Melo
2016-01-13 10:21                                   ` Ingo Molnar
2016-01-13 12:40                                     ` Peter Zijlstra
2016-01-14 11:27                                       ` Ingo Molnar
2016-01-14 11:36                                         ` Peter Zijlstra
2016-01-15  1:59                                           ` Stephane Eranian
2016-01-15  9:34                                             ` Peter Zijlstra
2016-01-15 18:58                                               ` Stephane Eranian
2016-01-15 19:49                                                 ` Arnaldo Carvalho de Melo
2016-01-15 21:49                                                   ` Stephane Eranian
2016-01-15 21:36                                                 ` Peter Zijlstra
2016-01-12 21:02                             ` Stephane Eranian
2016-01-12 13:08                   ` One Thousand Gnomes [this message]
2016-01-12 14:34                   ` Arnaldo Carvalho de Melo
2016-01-12 15:37                     ` Peter Zijlstra
2016-01-13 10:25                       ` Ingo Molnar
2016-01-12 14:23                 ` Arnaldo Carvalho de Melo
2016-01-13  9:57                   ` Ingo Molnar
2016-01-13 15:27                     ` Arnaldo Carvalho de Melo
2016-01-19 14:56                     ` Namhyung Kim
2016-01-19 15:27                       ` Peter Zijlstra
2016-01-19 15:48                         ` Arnaldo Carvalho de Melo
2016-01-09 10:31           ` Namhyung Kim
2016-01-11  9:27             ` Adrian Hunter
2016-01-11 11:02               ` Namhyung Kim
2016-01-11 11:54                 ` Adrian Hunter

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