From mboxrd@z Thu Jan  1 00:00:00 1970
Subject: Re: [RFC v1][PATCH]page_fault retry with NOPAGE_RETRY
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
In-Reply-To: <492E90BC.1090208@gmail.com>
References: <604427e00811212247k1fe6b63u9efe8cfe37bddfb5@mail.gmail.com>
	 <20081123091843.GK30453@elte.hu>
	 <604427e00811251042t1eebded6k9916212b7c0c2ea0@mail.gmail.com>
	 <20081126123246.GB23649@wotan.suse.de> <492DAA24.8040100@google.com>
	 <20081127085554.GD28285@wotan.suse.de> <492E6849.6090205@google.com>
	 <492E8708.4060601@gmail.com> <20081127120330.GM28285@wotan.suse.de>
	 <492E90BC.1090208@gmail.com>
Content-Type: text/plain; charset="UTF-8"
Date: Thu, 27 Nov 2008 13:32:36 +0100
Message-Id: <1227789156.4454.1519.camel@twins>
Mime-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: owner-linux-mm@kvack.org
Return-Path: <owner-linux-mm@kvack.org>
To: =?ISO-8859-1?Q?T=F6r=F6k?= Edwin <edwintorok@gmail.com>
Cc: Nick Piggin <npiggin@suse.de>, Mike Waychison <mikew@google.com>, Ying Han <yinghan@google.com>, Ingo Molnar <mingo@elte.hu>, linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm <akpm@linux-foundation.org>, David Rientjes <rientjes@google.com>, Rohit Seth <rohitseth@google.com>, Hugh Dickins <hugh@veritas.com>, "H. Peter Anvin" <hpa@zytor.com>
List-ID: <linux-mm.kvack.org>

On Thu, 2008-11-27 at 14:21 +0200, TA?rA?k 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.

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>