linux-kernel - Re: Linux 2.6.31

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Message-ID: <alpine.LFD.2.01.0909091644550.7458@localhost.localdomain>
Date:	Wed, 9 Sep 2009 16:46:46 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Paul Mackerras <paulus@...ba.org>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.31



On Thu, 10 Sep 2009, Paul Mackerras wrote:

> Linus Torvalds writes:
> 
> > There's also a fair chunk of new debugging/peformance counter stuff: 
> > memory leak detection ("kmemleak"), memory usage checking ("kmemcheck") 
> > and performance counters ("perf_counter"). Those new debugging features 
> > are not likely usable under any real load, but are good for finding kernel 
> > bugs at a huge performance cost.
> 
> Just to be clear, that last sentence applies to kmemleak and
> kmemcheck, but not perf_counters, right?

Yes. The perfcounter thing is certainly useful under real loads.

But both kmemleak and kmemcheck will probably be pretty unusable if you 
try to do anything that would stress the machine normally. Kind of like 
DEBUG_PAGEALLOC, just much worse.

			Linus
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