From: Ulrich Drepper <drepper@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ingo Molnar <mingo@elte.hu>,
Arjan van de Ven <arjan@infradead.org>,
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 <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: Re: pthread_create() slow for many threads; also time to revisit 64b context switch optimization?
Date: Wed, 13 Aug 2008 11:04:29 -0700 [thread overview]
Message-ID: <48A3222D.2060809@redhat.com> (raw)
In-Reply-To: <alpine.LFD.1.10.0808131007530.3462@nehalem.linux-foundation.org>
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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 ❖
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WARNING: multiple messages have this Message-ID (diff)
From: Ulrich Drepper <drepper@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ingo Molnar <mingo@elte.hu>,
Arjan van de Ven <arjan@infradead.org>,
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 <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: Re: pthread_create() slow for many threads; also time to revisit 64b context switch optimization?
Date: Wed, 13 Aug 2008 11:04:29 -0700 [thread overview]
Message-ID: <48A3222D.2060809@redhat.com> (raw)
In-Reply-To: <alpine.LFD.1.10.0808131007530.3462@nehalem.linux-foundation.org>
-----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.
- --
a?? Ulrich Drepper a?? Red Hat, Inc. a?? 444 Castro St a?? Mountain View, CA a??
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next prev parent reply other threads:[~2008-08-13 18:05 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <af8810200808121736q76640cc1kb814385072fe9b29@mail.gmail.com>
2008-08-13 0:45 ` pthread_create() slow for many threads; also time to revisit 64b context switch optimization? Pardo
2008-08-13 0:45 ` Pardo
2008-08-13 10:44 ` Ingo Molnar
2008-08-13 10:44 ` Ingo Molnar
2008-08-13 13:35 ` Arjan van de Ven
2008-08-13 13:35 ` Arjan van de Ven
2008-08-13 14:21 ` Ulrich Drepper
2008-08-13 14:21 ` Ulrich Drepper
2008-08-13 14:25 ` Ingo Molnar
2008-08-13 14:25 ` Ingo Molnar
2008-08-13 14:36 ` Ulrich Drepper
2008-08-13 14:36 ` Ulrich Drepper
2008-08-13 15:10 ` Ingo Molnar
2008-08-13 15:10 ` Ingo Molnar
2008-08-13 15:21 ` Ulrich Drepper
2008-08-13 15:21 ` Ulrich Drepper
2008-08-13 15:40 ` Ingo Molnar
2008-08-13 15:40 ` Ingo Molnar
2008-08-13 15:55 ` Ulrich Drepper
2008-08-13 15:55 ` Ulrich Drepper
2008-08-13 16:02 ` Ingo Molnar
2008-08-13 16:02 ` Ingo Molnar
2008-08-15 15:54 ` Jamie Lokier
2008-08-15 15:54 ` Jamie Lokier
2008-08-15 16:03 ` Ingo Molnar
2008-08-15 16:03 ` Ingo Molnar
2008-08-15 17:13 ` Ulrich Drepper
2008-08-15 17:13 ` Ulrich Drepper
2008-08-15 17:19 ` Ingo Molnar
2008-08-15 17:19 ` Ingo Molnar
2008-08-15 17:23 ` Ulrich Drepper
2008-08-15 17:23 ` Ulrich Drepper
2008-08-15 19:00 ` Ingo Molnar
2008-08-15 19:00 ` Ingo Molnar
2008-08-13 17:09 ` Linus Torvalds
2008-08-13 17:09 ` Linus Torvalds
2008-08-13 18:04 ` Ulrich Drepper [this message]
2008-08-13 18:04 ` Ulrich Drepper
2008-08-13 18:16 ` Arjan van de Ven
2008-08-13 18:16 ` Arjan van de Ven
2008-08-13 18:22 ` Ulrich Drepper
2008-08-13 18:22 ` Ulrich Drepper
2008-08-13 16:05 ` H. Peter Anvin
2008-08-13 16:05 ` H. Peter Anvin
2008-08-13 20:42 ` Andi Kleen
2008-08-13 20:42 ` Andi Kleen
2008-08-13 20:56 ` Andrew Morton
2008-08-13 20:56 ` Andrew Morton
2008-08-13 21:46 ` Andi Kleen
2008-08-13 21:46 ` Andi Kleen
2008-08-15 12:43 ` Ingo Molnar
2008-08-15 12:43 ` Ingo Molnar
2008-08-15 13:33 ` Andi Kleen
2008-08-15 13:33 ` Andi Kleen
2008-08-21 16:35 Leon Bottou
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