linux-kernel - Re: [RFC/PATCH] scripts/tracing: Add trace

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Date:	Tue, 22 Jan 2013 15:41:19 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Tim Bird <tim.bird@...sony.com>,
	Ezequiel Garcia <elezegarcia@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [RFC/PATCH] scripts/tracing: Add trace_analyze.py tool

(Adding acme to CC.)

On Tue, Jan 22, 2013 at 11:46 AM, Ezequiel Garcia
<ezequiel.garcia@...e-electrons.com> wrote:
> From: Ezequiel Garcia <elezegarcia@...il.com>
>
> The purpose of trace_analyze.py tool is to perform static
> and dynamic memory analysis using a kmem ftrace
> log file and a built kernel tree.
>
> This script and related work has been done on the CEWG/2012 project:
> "Kernel dynamic memory allocation tracking and reduction"
> (More info here [1])
>
> It produces mainly two kinds of outputs:
>  * an account-like output, similar to the one given by Perf, example below.
>  * a ring-char output, examples here [2].
>
> $ ./scripts/tracing/trace_analyze.py -k linux -f kmem.log --account-file account.txt
> $ ./scripts/tracing/trace_analyze.py -k linux -f kmem.log -c account.txt
>
> This will produce an account file like this:
>
>     current bytes allocated:     669696
>     current bytes requested:     618823
>     current wasted bytes:         50873
>     number of allocs:              7649
>     number of frees:               2563
>     number of callers:              115
>
>      total    waste      net alloc/free  caller
>     ---------------------------------------------
>     299200        0   298928  1100/1     alloc_inode+0x4fL
>     189824        0   140544  1483/385   __d_alloc+0x22L
>      51904        0    47552   811/68    sysfs_new_dirent+0x4eL
>     [...]
>
> [1] http://elinux.org/Kernel_dynamic_memory_analysis
> [2] http://elinux.org/Kernel_dynamic_memory_analysis#Current_dynamic_footprint
>
> Cc: Pekka Enberg <penberg@...nel.org>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Ingo Molnar <mingo@...hat.com>
> Signed-off-by: Ezequiel Garcia <elezegarcia@...il.com>

Looks really useful! Dunno if this makes most sense as a separate
script or as an extension perf.

                        Pekka
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