linux-kernel - Re: AIM7 40% regression with 2.6.26-rc1

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Message-ID: <20080507153538.446693af@core>
Date:	Wed, 7 May 2008 15:35:38 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andi Kleen <andi@...stfloor.org>, Matthew Wilcox <matthew@....cx>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexander Viro <viro@....linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: AIM7 40% regression with 2.6.26-rc1

> But my preferred option would indeed be just turning it back into a 
> spinlock - and screw latency and BKL preemption - and having the RT people 
> who care deeply just work on removing the BKL in the long run.

It isn't as if the RT build can't use a different lock type to the
default build.

> Is BKL preemption worth it? Sounds very dubious. Sounds even more dubious 
> when we now apparently have even more reason to aim for removing the BKL 
> rather than trying to mess around with it.

We have some horrible long lasting BKL users left unfortunately.

Alan
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