linux-kernel - Re: [PATCH 4/5] kmemtrace: SLUB hooks.

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Message-ID: <y0mhc9ra7m6.fsf@ton.toronto.redhat.com>
Date:	Mon, 11 Aug 2008 11:34:09 -0400
From:	fche@...hat.com (Frank Ch. Eigler)
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>,
	mathieu.desnoyers@...ymtl.ca, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, rdunlap@...otime.net,
	mpm@...enic.com, tglx@...utronix.de
Subject: Re: [PATCH 4/5] kmemtrace: SLUB hooks.

Christoph Lameter <cl@...ux-foundation.org> writes:

> [...]
>> There should be no extra function calls when this is configured on but 
>> tracing disabled. We try very hard to keep the speed of the tracer as 
>> close to a non tracing kernel as possible when tracing is disabled.
>
> Makes sense. But then we have even more code bloat because of the
> tests that are inserted in all call sites of kmalloc.

Are you talking about the tests that implement checking whether a
marker is active or not?  Those checks are already efficient, and will
get more so with the "immediate values" optimization in or near the
tree.

- FChE
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