linux-kernel - Re: [RFC v1][PATCH]page_fault retry with NOPAGE

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Message-Id: <1227789156.4454.1519.camel@twins>
Date:	Thu, 27 Nov 2008 13:32:36 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Török Edwin <edwintorok@...il.com>
Cc:	Nick Piggin <npiggin@...e.de>, Mike Waychison <mikew@...gle.com>,
	Ying Han <yinghan@...gle.com>, Ingo Molnar <mingo@...e.hu>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Rohit Seth <rohitseth@...gle.com>,
	Hugh Dickins <hugh@...itas.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [RFC v1][PATCH]page_fault retry with NOPAGE_RETRY

On Thu, 2008-11-27 at 14:21 +0200, Török Edwin wrote:

> How about distributing tasks to a set of worked threads, is the
> overhead of using IPC instead of mutexes/cond variables acceptable?

Inter process pthread mutexes should be very fast in the latest kernels
as they'll avoid the mmap_sem by use of get_user_pages_fast().

Not sure if pthread condition variables also work inter-process.

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