From: Nick Piggin <npiggin@suse.de>
To: Ingo Molnar <mingo@elte.hu>
Cc: Nick Piggin <npiggin@suse.de>,
Arnaldo Carvalho de Melo <acme@infradead.org>,
linux-kernel@vger.kernel.org,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Mike Galbraith <efault@gmx.de>,
Peter Zijlstra <peterz@infradead.org>,
Stephane Eranian <eranian@google.com>
Subject: Re: [PATCH 11/19] perf record: Release resources at exit
Date: Mon, 2 Aug 2010 18:03:53 +1000 [thread overview]
Message-ID: <20100802080353.GA8713@amd> (raw)
In-Reply-To: <20100802075422.GA24085@elte.hu>
On Mon, Aug 02, 2010 at 09:54:22AM +0200, Ingo Molnar wrote:
>
> * Nick Piggin <npiggin@suse.de> wrote:
>
> > On Sun, Aug 01, 2010 at 10:08:46PM -0300, Arnaldo Carvalho de Melo wrote:
> > > From: Arnaldo Carvalho de Melo <acme@redhat.com>
> > >
> > > So that we can reduce the noise on valgrind when looking for memory
> > > leaks.
> >
> > Really? That's rather crappy of valgrind. exit is well defined to release
> > resources and that's often a more efficient way to do it It finds and
> > batches things a lot better, eg. it can avoid all TLB flushing of freeing
> > memory that munmap requires.
>
> That's certainly true but there's no valgrind crappiness here: valgrind simply
> can do a better job of finding leaks if there's a well defined "all resources
> the app still knows about are freed now" point.
"noise" sounds like false positives though. Certainly if this is
instead allows valgrind to run in a particular mode that assumes
no application resources consumed at exit(2) time, I wouldn't
call it crappy :)
But you could equally sprinkle in other valgrind specific annotations
or semantics at various points in the code to improve its coverage,
no?
next prev parent reply other threads:[~2010-08-02 8:04 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1280711334-30000-1-git-send-email-acme@infradead.org>
2010-08-02 1:08 ` [PATCH 01/19] perf hists: Mark entries filtered by parent Arnaldo Carvalho de Melo
2010-08-02 1:08 ` [PATCH 02/19] perf sort: Make column width code per hists instance Arnaldo Carvalho de Melo
2010-08-02 1:08 ` [PATCH 03/19] perf ui: Restore SPACE as an alias to PGDN in annotate Arnaldo Carvalho de Melo
2010-08-02 1:08 ` [PATCH 04/19] perf hist: Introduce routine to measure lenght of formatted entry Arnaldo Carvalho de Melo
2010-08-02 1:08 ` [PATCH 05/19] perf ui: Consider the refreshed dimensions in ui_browser__show Arnaldo Carvalho de Melo
2010-08-02 1:08 ` [PATCH 06/19] perf ui: Show the scroll bar over the left window frame Arnaldo Carvalho de Melo
2010-08-02 1:08 ` [PATCH 07/19] perf ui: New hists tree widget Arnaldo Carvalho de Melo
2010-08-02 1:08 ` [PATCH 08/19] perf report: Don't abbreviate file paths relative to the cwd Arnaldo Carvalho de Melo
2010-08-02 1:08 ` [PATCH 09/19] perf tools: Remove unneeded code for tracking the cwd in perf sessions Arnaldo Carvalho de Melo
2010-08-02 1:08 ` [PATCH 10/19] perf man pages: Fix cut'n'paste error Arnaldo Carvalho de Melo
2010-08-02 1:08 ` [PATCH 11/19] perf record: Release resources at exit Arnaldo Carvalho de Melo
2010-08-02 7:30 ` Nick Piggin
2010-08-02 7:54 ` Ingo Molnar
2010-08-02 8:03 ` Nick Piggin [this message]
2010-08-02 9:17 ` Ingo Molnar
2010-08-02 9:59 ` Nick Piggin
2010-08-02 14:49 ` Arnaldo Carvalho de Melo
2010-08-02 8:08 ` Pekka Enberg
2010-08-02 1:08 ` [PATCH 12/19] perf symbols: Precisely specify if dso->{long,short}_name should be freed Arnaldo Carvalho de Melo
2010-08-02 1:08 ` [PATCH 13/19] perf tools: Factor out buildid reading and make it implicit in dso__load Arnaldo Carvalho de Melo
2010-08-02 1:08 ` [PATCH 14/19] perf tools: remove extra build-id check factored into dso__load Arnaldo Carvalho de Melo
2010-08-02 1:08 ` [PATCH 15/19] perf symbols: Improve debug image search when loading symbols Arnaldo Carvalho de Melo
2010-08-02 1:08 ` [PATCH 16/19] perf tui: Make CTRL+Z suspend perf Arnaldo Carvalho de Melo
2010-08-02 1:08 ` [PATCH 17/19] perf probe: Rename common fields/functions from kprobe to probe Arnaldo Carvalho de Melo
2010-08-02 1:08 ` [PATCH 18/19] perf tools: Release thread resources on PERF_RECORD_EXIT Arnaldo Carvalho de Melo
2010-08-02 1:08 ` [PATCH 19/19] perf tools: Release session and symbol resources on exit Arnaldo Carvalho de Melo
2010-08-02 6:26 ` [PATCH 00/19] perf/core improvements and fixes Ingo Molnar
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