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From: Ingo Molnar <mingo@elte.hu>
To: Ulrich Drepper <drepper@redhat.com>
Cc: Pierre Peiffer <pierre.peiffer@bull.net>,
	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: Tue, 16 Jan 2007 18:50:21 +0100	[thread overview]
Message-ID: <20070116175021.GA9778@elte.hu> (raw)
In-Reply-To: <45AD0F70.30808@redhat.com>


* 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.

	Ingo

  reply	other threads:[~2007-01-16 17:51 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-09 16:15 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 [this message]
2007-01-17  7:50                   ` Pierre Peiffer

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