From: David Ahern <dsahern@gmail.com>
To: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Luigi Semenzato <semenzato@chromium.org>,
Ingo Molnar <mingo@kernel.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
Vasiliy Kulikov <segoon@openwall.com>,
Stephen Wilson <wilsons@start.ca>,
Oleg Nesterov <oleg@redhat.com>, Tejun Heo <tj@kernel.org>,
Paul Gortmaker <paul.gortmaker@windriver.com>,
Andi Kleen <ak@linux.intel.com>,
Lucas De Marchi <lucas.demarchi@profusion.mobi>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
Frederic Weisbecker <fweisbec@gmail.com>,
Namhyung Kim <namhyung@gmail.com>,
Robert Richter <robert.richter@amd.com>,
linux-kernel@vger.kernel.org, sonnyrao@chromium.org,
olofj@chromium.org, eranian@google.com
Subject: Re: [PATCH] perf: do not flush maps on COMM for perf report
Date: Wed, 22 Aug 2012 10:56:13 -0600 [thread overview]
Message-ID: <50350F2D.6030408@gmail.com> (raw)
In-Reply-To: <20120822162958.GA13623@infradead.org>
On 8/22/12 10:29 AM, Arnaldo Carvalho de Melo wrote:
> Adding the EXEC event, ditto. And I agree that while adding it we want
> to do 1/2 as pre-requisite.
maps should not be flushed on a COMM event, so that was a mistake. Given
that what new information does an EXEC event provide? Same process id. A
COMM event is generated on an exec, so the name change happens. Mappings
are dropped prior to that - and there is no unmap event. That seems to
be a missing piece. Maps are added which is handled by MMAP events.
After that why is an exec event relevant?
David
next prev parent reply other threads:[~2012-08-22 16:56 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-21 21:52 [PATCH] perf: do not flush maps on COMM for perf report Luigi Semenzato
2012-08-22 7:28 ` Ingo Molnar
2012-08-22 16:09 ` Luigi Semenzato
2012-08-22 16:29 ` Arnaldo Carvalho de Melo
2012-08-22 16:56 ` David Ahern [this message]
2012-08-22 18:16 ` Arnaldo Carvalho de Melo
2012-08-22 18:26 ` Luigi Semenzato
2012-08-22 18:42 ` David Ahern
2012-08-22 19:22 ` David Ahern
2012-10-24 6:04 ` [tip:perf/urgent] perf tools: " tip-bot for Luigi Semenzato
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