Subject: Re: [RFC v1][PATCH]page_fault retry with NOPAGE_RETRY
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
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>
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Date: Thu, 27 Nov 2008 13:32:36 +0100
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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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