linux-kernel - Re: pthread_create() slow for many threads; also time to revisit 64b context switch optimization?

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Message-ID: <48A2FC17.9070302@redhat.com>
Date:	Wed, 13 Aug 2008 08:21:59 -0700
From:	Ulrich Drepper <drepper@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Arjan van de Ven <arjan@...radead.org>, akpm@...ux-foundation.org,
	hugh@...itas.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	briangrant@...gle.com, cgd@...gle.com, mbligh@...gle.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: pthread_create() slow for many threads; also time to revisit
 64b context switch optimization?

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Ingo Molnar wrote:
> i find it pretty unacceptable these days that we limit any aspect of 
> pure 64-bit apps in any way to 4GB (or any other 32-bit-ish limit). 

Sure, but if we can pin-point the sub-archs for which it is the problem
then a flag to optionally request it is even easier to handle.  You'd
simply ignore the flag for anything but the P4 architecture.

I personally have no problem removing the whole thing because I have no
such machine running anymore.  But there are people out there who have.

- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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