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To: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
Cc: Ingo Molnar <mingo@elte.hu>, Matthew Wilcox <matthew@wil.cx>,
       LKML <linux-kernel@vger.kernel.org>,
       Alexander Viro <viro@ftp.linux.org.uk>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>
Subject: Re: AIM7 40% regression with 2.6.26-rc1
From: Andi Kleen <andi@firstfloor.org>
References: <1210052904.3453.30.camel@ymzhang>
	<20080506114449.GC32591@elte.hu> <1210126286.3453.37.camel@ymzhang>
	<1210131712.3453.43.camel@ymzhang>
Date: Wed, 07 May 2008 13:00:14 +0200
In-Reply-To: <1210131712.3453.43.camel@ymzhang> (Yanmin Zhang's message of "Wed, 07 May 2008 11:41:52 +0800")
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"Zhang, Yanmin" <yanmin_zhang@linux.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?)