linux-kernel - Re: [RFC][PATCH 2/2] [PATCH 2/2] tracing/slub: Move kmalloc tracepoint out of inline code

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Message-ID: <4CEDB53E.5000203@cn.fujitsu.com>
Date:	Thu, 25 Nov 2010 09:00:46 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Matt Mackall <mpm@...enic.com>, linux-mm@...ck.org,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>,
	Richard Kennedy <richard@....demon.co.uk>
Subject: Re: [RFC][PATCH 2/2] [PATCH 2/2] tracing/slub: Move kmalloc tracepoint
 out of inline code

Cc: Richard Kennedy <richard@....demon.co.uk>

Steven Rostedt wrote:
> From: Steven Rostedt <srostedt@...hat.com>
> 
> The tracepoint for kmalloc is in the slub inlined code which causes
> every instance of kmalloc to have the tracepoint.
> 
> This patch moves the tracepoint out of the inline code to the
> slub C file (and to page_alloc), which removes a large number of
> inlined trace points.
> 
>   objdump -dr vmlinux.slub| grep 'jmpq.*<trace_kmalloc' |wc -l
> 375
>   objdump -dr vmlinux.slub.patched| grep 'jmpq.*<trace_kmalloc' |wc -l
> 2
> 
> This also has a nice impact on size.
>    text	   data	    bss	    dec	    hex	filename
> 7050424	1961068	2482688	11494180	 af6324	vmlinux.slub
> 6979599	1944620	2482688	11406907	 ae0e3b	vmlinux.slub.patched
> 
> Siged-off-by: Steven Rostedt <rostedt@...dmis.org>

See this patch from Richard: :)

http://marc.info/?l=linux-kernel&m=128765337729262&w=2

But he only touched slub.
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