linux-kernel - Re: [PATCH] kmemcheck: don't track pages allocated with interrupts disabled

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Date:	Sat, 07 Jun 2008 21:47:21 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Vegard Nossum <vegard.nossum@...il.com>
CC:	Pekka Enberg <penberg@...helsinki.fi>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kmemcheck: don't track pages allocated with interrupts
 disabled


> Maybe we can do the splitting when kmemcheck is enabled for the first
> time, either with the proc handler or at boot if kmemcheck=1 is passed
> on the command line. Both of these contexts should/can be
> !irqs_disabled(), I think.

You could always split at boot when the CONFIG is enabled. I assume the
CONFIG alone has already quite a lot of overhead and it will be only
on in debug kernels and adding some more TLB misses shouldn't be really
a problem. Using 2MB pages in kernel is merely  an optimization.

-Andi


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