linux-kernel - Re: [PATCH] tracing/kmemtrace: normalize the raw tracer event to the unified tracing API

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Message-Id: <1230623364.6091.9.camel@penberg-laptop>
Date:	Tue, 30 Dec 2008 09:49:24 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>,
	mingo@...e.hu
Subject: Re: [PATCH] tracing/kmemtrace: normalize the raw tracer event to
	the unified tracing API

Hi Frederic,

On Mon, 2008-12-29 at 23:09 +0100, Frederic Weisbecker wrote:
> Pekka, note that I would be pleased to add statistical tracing on
> this tracer, but I would need a hashtable, or an array, or a list, or whatever
> iterable to insert the data into the stat tracing api.
> 
> But I don't know your projects about this... whether you wanted to use a section
> or something else...

It really depends on what we're tracing. If we're interested in just the
allocation hotspots, a section will do just fine. However, if we're
tracing memory footprint, we need to take into store the object pointer
returned from kmalloc() and kmem_cache_alloc() so we can update
call-site statistics properly upon kfree().

So I suppose we need both, a section for per call-site statistics and a
hash table for the object -> call-site mapping.

		Pekka

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