linux-kernel - Re: [PATCH 00/11] V4: rwsem changes + down_read

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Date:	Tue, 25 May 2010 08:16:11 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Michel Lespinasse <walken@...gle.com>,
	David Howells <dhowells@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Waychison <mikew@...gle.com>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Ying Han <yinghan@...gle.com>
Subject: Re: [PATCH 00/11] V4: rwsem changes + down_read_critical()
 proposal



On Tue, 25 May 2010, Peter Zijlstra wrote:
> 
> So what happened to those patches that dropped mmap_sem during I/O?

They were horrible. The amount of retrying was just nasty. I don't think 
it's going to ever be a viable approach.

Feel free to prove me wrong with clean patches, but I doubt you can.

		Linus
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