linux-kernel - Re: [patch] speed up / fix the new generic semaphore code (fix AIM7 40% regression with 2.6.26-rc1)

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Message-ID: <20080509002707.67f79d3b@core>
Date:	Fri, 9 May 2008 00:27:07 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Andi Kleen <andi@...stfloor.org>,
	Matthew Wilcox <matthew@....cx>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexander Viro <viro@....linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [patch] speed up / fix the new generic semaphore code (fix AIM7
 40% regression with 2.6.26-rc1)

>     380  down <= lock_kernel <= tty_release <= __fput <
>     422  down <= lock_kernel <= chrdev_open <= __dentry_open <
> 
> rather than the write routines. But it may be that Ingo was just profiling 
> two different sections, and it's really all of them.

tty release is probably a few months away from getting cured  - I'm
afraid it will almost certainly be the very last user of the BKL in tty
to get fixed as it depends on everything else being sanely locked.
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