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

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Message-ID: <87lk2mbcqp.fsf@basil.nowhere.org>
Date:	Wed, 07 May 2008 13:00:14 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Matthew Wilcox <matthew@....cx>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexander Viro <viro@....linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: AIM7 40% regression with 2.6.26-rc1

"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com> writes:
> 3) Caller of lcok_kernel are sys_fcntl/vfs_ioctl/tty_release/chrdev_open.

I have an older patchkit that introduced unlocked_fnctl for some cases. It was 
briefly in mm but then dropped. Sounds like it is worth resurrecting?

tty_* is being taken care of by Alan.

chrdev_open is more work.

-Andi (who BTW never quite understood why BKL is a semaphore now and not
a spinlock?)
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