linux-kernel - Re: [PATCH 1/2] tracing: Define kmem_trace_alloc

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Message-ID: <4B21E826.5060502@cs.helsinki.fi>
Date:	Fri, 11 Dec 2009 08:35:18 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Li Zefan <lizf@...fujitsu.com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
Subject: Re: [PATCH 1/2] tracing: Define kmem_trace_alloc_notrace unconditionally

Li Zefan kirjoitti:
> 于 2009年12月11日 14:01, Pekka Enberg 写道:
>> Pekka Enberg wrote:
>>> Li Zefan wrote:
>>>> Always define kmem_trace_alloc_{,node}_notrace(), otherwise
>>>> perf-kmem will show wrong stats ifndef CONFIG_KMEMTRACE,
>>>> because a kmalloc() memory allocation may be traced by
>>>> both trace_kmalloc() and trace_kmem_cache_alloc().
>>>>
>>>> Signed-off-by: Li Zefan <lizf@...fujitsu.com>
>>> Did you check how much this will make kernel text bigger because of
>>> the inlining happening in kmem_cache_alloc_notrace()?
>> Maybe use CONFIG_TRACING instead of CONFIG_KMEMTRACE here like in the
>> other patch?
>>
> 
> Wouldn't removing CONFIG_KMEMTRACE make the code cleaner?
> Anyway, if CONFIG_TRACING is not enabled, all the trace_xxx()
> will be turned into no-op.

Again, I am talking about kernel text size increase in mm/slub.c.
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