Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755844AbYHMSFn (ORCPT ); Wed, 13 Aug 2008 14:05:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752729AbYHMSFh (ORCPT ); Wed, 13 Aug 2008 14:05:37 -0400 Received: from mx1.redhat.com ([66.187.233.31]:40358 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752541AbYHMSFg (ORCPT ); Wed, 13 Aug 2008 14:05:36 -0400 Message-ID: <48A3222D.2060809@redhat.com> Date: Wed, 13 Aug 2008 11:04:29 -0700 From: Ulrich Drepper Organization: Red Hat, Inc. User-Agent: Thunderbird 2.0.0.16 (X11/20080723) MIME-Version: 1.0 To: Linus Torvalds CC: Ingo Molnar , Arjan van de Ven , akpm@linux-foundation.org, hugh@veritas.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, briangrant@google.com, cgd@google.com, mbligh@google.com, Thomas Gleixner , "H. Peter Anvin" Subject: Re: pthread_create() slow for many threads; also time to revisit 64b context switch optimization? References: <20080813104445.GA24632@elte.hu> <20080813063533.444c650d@infradead.org> <48A2EE07.3040003@redhat.com> <20080813142529.GB21129@elte.hu> <48A2F157.7000303@redhat.com> <20080813151007.GA8780@elte.hu> <48A2FC17.9070302@redhat.com> <20080813154043.GA11886@elte.hu> <48A303EE.8070002@redhat.com> In-Reply-To: X-Enigmail-Version: 0.95.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1088 Lines: 29 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Linus Torvalds wrote: > Ulrich, I don't understand why you worry more about a _potential_ (and > fairly unlikely) complaint, than about a real one today. Of course I care. All I try to do is to prevent going from one extreme (all focus on P4s) to the other (ignore P4s completely). Even ignoring this one case here, I think it's in any case useful for userlevel to tell the kernel that an anonymous memory region is needed for a stack. This might allow better optimizations and/or security implementations. - -- ➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEARECAAYFAkijIi0ACgkQ2ijCOnn/RHRqCwCcCAeJw+BzO9MSwKRtemm5VAq3 FBYAoKbMwR1pkthjLvNlpCSVS76CCoAq =UfmJ -----END PGP SIGNATURE----- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/