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

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From: Ulrich Drepper <drepper@...>
To: Linus Torvalds <torvalds@...>
Cc: Ingo Molnar <mingo@...>, Arjan van de Ven <arjan@...>, <akpm@...>, <hugh@...>, <linux-mm@...>, <linux-kernel@...>, <briangrant@...>, <cgd@...>, <mbligh@...>, Thomas Gleixner <tglx@...>, H. Peter Anvin <hpa@...>
Subject: Re: pthread_create() slow for many threads; also time to revisit 64b context switch optimization?
Date: Wednesday, August 13, 2008 - 2:04 pm

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Linus Torvalds wrote:

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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Messages in current thread:
Re: pthread_create() slow for many threads; also time to rev..., Pardo, (Tue Aug 12, 8:45 pm)
Re: pthread_create() slow for many threads; also time to rev..., Ingo Molnar, (Wed Aug 13, 6:44 am)
Re: pthread_create() slow for many threads; also time to rev..., Arjan van de Ven, (Wed Aug 13, 9:35 am)
Re: pthread_create() slow for many threads; also time to rev..., Ulrich Drepper, (Wed Aug 13, 10:21 am)
Re: pthread_create() slow for many threads; also time to rev..., Ingo Molnar, (Wed Aug 13, 10:25 am)
Re: pthread_create() slow for many threads; also time to rev..., Ulrich Drepper, (Wed Aug 13, 10:36 am)
Re: pthread_create() slow for many threads; also time to rev..., Ingo Molnar, (Wed Aug 13, 11:10 am)
Re: pthread_create() slow for many threads; also time to rev..., Andi Kleen, (Wed Aug 13, 4:42 pm)
Re: pthread_create() slow for many threads; also time to rev..., Ingo Molnar, (Fri Aug 15, 8:43 am)
Re: pthread_create() slow for many threads; also time to rev..., Andi Kleen, (Fri Aug 15, 9:33 am)
Re: pthread_create() slow for many threads; also time to rev..., Andrew Morton, (Wed Aug 13, 4:56 pm)
Re: pthread_create() slow for many threads; also time to rev..., Andi Kleen, (Wed Aug 13, 5:46 pm)
Re: pthread_create() slow for many threads; also time to rev..., Ulrich Drepper, (Wed Aug 13, 11:21 am)
Re: pthread_create() slow for many threads; also time to rev..., H. Peter Anvin, (Wed Aug 13, 12:05 pm)
Re: pthread_create() slow for many threads; also time to rev..., Ingo Molnar, (Wed Aug 13, 11:40 am)
Re: pthread_create() slow for many threads; also time to rev..., Ulrich Drepper, (Wed Aug 13, 11:55 am)
Re: pthread_create() slow for many threads; also time to rev..., Linus Torvalds, (Wed Aug 13, 1:09 pm)
Re: pthread_create() slow for many threads; also time to rev..., Ulrich Drepper, (Wed Aug 13, 2:04 pm)
Re: pthread_create() slow for many threads; also time to rev..., Arjan van de Ven, (Wed Aug 13, 2:16 pm)
Re: pthread_create() slow for many threads; also time to rev..., Ulrich Drepper, (Wed Aug 13, 2:22 pm)
Re: pthread_create() slow for many threads; also time to rev..., Ingo Molnar, (Wed Aug 13, 12:02 pm)
Re: pthread_create() slow for many threads; also time to rev..., Jamie Lokier, (Fri Aug 15, 11:54 am)
Re: pthread_create() slow for many threads; also time to rev..., Ulrich Drepper, (Fri Aug 15, 1:13 pm)
Re: pthread_create() slow for many threads; also time to rev..., Ingo Molnar, (Fri Aug 15, 1:19 pm)
Re: pthread_create() slow for many threads; also time to rev..., Ulrich Drepper, (Fri Aug 15, 1:23 pm)
Re: pthread_create() slow for many threads; also time to rev..., Ingo Molnar, (Fri Aug 15, 3:00 pm)
Re: pthread_create() slow for many threads; also time to rev..., Ingo Molnar, (Fri Aug 15, 12:03 pm)