From: Ingo Molnar <mingo@elte.hu>
To: Nick Piggin <npiggin@suse.de>
Cc: 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 09:54:22 +0200 [thread overview]
Message-ID: <20100802075422.GA24085@elte.hu> (raw)
In-Reply-To: <20100802073009.GB7841@amd>
* 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.
The _kernel_ obviously can release all resources. The distinction is between
'resources known to the app' and 'all resources'. That set contains the
leaking resources.
Thanks,
Ingo
next prev parent reply other threads:[~2010-08-02 7:54 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 [this message]
2010-08-02 8:03 ` Nick Piggin
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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