linux-kernel - Re: [PATCH 4/4] tracing, page-allocator: Add a postprocessing script for page-allocator-related ftrace events

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Date:	Wed, 05 Aug 2009 15:04:54 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, penberg@...helsinki.fi,
	fweisbec@...il.com, rostedt@...dmis.org, mel@....ul.ie,
	lwoodman@...hat.com, riel@...hat.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 4/4] tracing, page-allocator: Add a postprocessing
 script for page-allocator-related ftrace events

On Tue, 2009-08-04 at 22:35 +0200, Ingo Molnar wrote:

> Did you never want to see whether firefox is leaking [any sort of] 
> memory, and if yes, on what callsites? Try something like on an 
> already running firefox context:
> 
>   perf stat -e kmem:mm_page_alloc \
>             -e kmem:mm_pagevec_free \
>             -e kmem:mm_page_free_direct \
>      -p $(pidof firefox-bin) sleep 10
> 
> .... and "perf record" for the specific callsites.

If these tracepoints were to use something like (not yet in mainline)

  TP_perf_assign(
 	__perf_data(obj);
  ),

Where obj was the thing being allocated/freed, you could, when using
PERF_SAMPLE_ADDR even match up alloc/frees, combined with
PERF_SAMPLE_CALLCHAIN you could then figure out where the unmatched
entries came from.

Might be useful, dunno.


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