linux-kernel - Re: 2.6.24-rc6-mm1

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Message-ID: <20071230131018.GC16946@elte.hu>
Date:	Sun, 30 Dec 2007 14:10:18 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, trem <tremyfr@...oo.fr>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.24-rc6-mm1


* Herbert Xu <herbert@...dor.apana.org.au> wrote:

> > Ingo, it's not good that we have cond_resched() definitions 
> > conditionally duplicated in kernel.h - that's increasing the risk of 
> > bugs like this one.
> 
> Actually, why do we even have cond_resched when real preemption is on? 
> It seems to be a waste of space and time.

due to the BKL. cond_resched() in BKL code breaks up BKL latencies.

i dont mind not doing that though - we should increase the pain for BKL 
users, so that subsystems finally get rid of it altogether. 
lock_kernel() use within the kernel is still rampant - there are still 
more than 400 callsites to lock_kernel().

	Ingo
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