linux-kernel - Re: [PATCH 2.6.20-rc4 0/4] futexes functionalities and improvements

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Date:	Tue, 16 Jan 2007 18:50:21 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Ulrich Drepper <drepper@...hat.com>
Cc:	Pierre Peiffer <pierre.peiffer@...l.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, Jakub Jelinek <jakub@...hat.com>
Subject: Re: [PATCH 2.6.20-rc4 0/4] futexes functionalities and improvements


* Ulrich Drepper <drepper@...hat.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.

	Ingo
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