linux-kernel - Re: [GIT PULL] kmemcheck updates for -tip

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Date:	Sun, 22 Feb 2009 18:06:32 +0100
From:	Vegard Nossum <vegard.nossum@...il.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] kmemcheck updates for -tip

2009/2/22 Frederic Weisbecker <fweisbec@...il.com>:
> BTW, I just tested kmemcheck (without these fixes pulled) and encountered some
> troubles with the function graph tracer which hangs during the self tests.
> As well as a message from hrtimer which tells its interrupt is too slow.
>
> Well, I'm pulling latest -tip and will see.

Hm, yes. kmemcheck doesn't work well with ftrace -- you'd have to
disable tracing (i.e. removing the -pg option to gcc) for at least the
x86 page fault handler and the kmemcheck code. I had a patch to fix
this a while ago, but it's not very nice to exclude page faults from
ftrace.

I should make it depend on !FTRACE for now to prevent more
head-scratching from others. Thanks for testing!


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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