From: Pierre Peiffer <pierre.peiffer@bull.net>
To: Ingo Molnar <mingo@elte.hu>
Cc: Ulrich Drepper <drepper@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>, Jakub Jelinek <jakub@redhat.com>
Subject: Re: [PATCH 2.6.20-rc4 0/4] futexes functionalities and improvements
Date: Wed, 17 Jan 2007 08:50:04 +0100 [thread overview]
Message-ID: <45ADD52C.50105@bull.net> (raw)
In-Reply-To: <20070116175021.GA9778@elte.hu>
Ingo Molnar a écrit :
> * Ulrich Drepper <drepper@redhat.com> wrote:
>
>>> what do you mean by that - which is this same resource?
>> From what has been said here before, all futexes are stored in the
>> same list or hash table or whatever it was. I want to see how that
>> code behaves if many separate processes concurrently use futexes.
>
> futexes are stored in the bucket hash, and these patches do not change
> that. The pi-list that was talked about is per-futex. So there's no
> change to the way futexes are hashed nor should there be any scalability
> impact - besides the micro-impact that was measured in a number of ways
> - AFAICS.
Yes, that's completely right !
--
Pierre
prev parent reply other threads:[~2007-01-17 7:51 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-09 16:15 [PATCH 2.6.20-rc4 0/4] futexes functionalities and improvements Pierre Peiffer
2007-01-11 17:47 ` Ulrich Drepper
[not found] ` <20070111134615.34902742.akpm@osdl.org>
2007-01-12 7:53 ` Pierre Peiffer
2007-01-12 7:58 ` Ingo Molnar
2007-01-16 8:34 ` Pierre Peiffer
2007-01-16 9:44 ` Ingo Molnar
2007-01-16 15:14 ` Ulrich Drepper
2007-01-16 15:40 ` Ingo Molnar
2007-01-16 17:46 ` Ulrich Drepper
2007-01-16 17:50 ` Ingo Molnar
2007-01-17 7:50 ` Pierre Peiffer [this message]
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