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

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Message-ID: <alpine.LFD.1.10.0805080754310.3024@woody.linux-foundation.org>
Date:	Thu, 8 May 2008 07:58:59 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
cc:	Matthew Wilcox <matthew@....cx>, Ingo Molnar <mingo@...e.hu>,
	"J. Bruce Fields" <bfields@...i.umich.edu>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexander Viro <viro@....linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org
Subject: Re: AIM7 40% regression with 2.6.26-rc1



On Thu, 8 May 2008, Zhang, Yanmin wrote:
>
> I collected oprofile data. It looks not useful, as cpu idle is more than 50%.

Ahh, so it's probably still the BKL that is the problem, it's just not in 
the file locking code. The changes to fs/locks.c probably didn't matter 
all that much, and the additional regression was likely just some 
perturbation.

So it's probably fasync that AIM7 tests. Quite possibly coupled with 
/dev/tty etc. No file locking.

			Linus
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