From: Leon Bottou <leon@bottou.org>
To: linux-kernel@vger.kernel.org
Subject: Re: pthread_create() slow for many threads; also time to revisit 64b context switch optimization?
Date: Thu, 21 Aug 2008 16:35:37 +0000 (UTC) [thread overview]
Message-ID: <loom.20080821T163143-520@post.gmane.org> (raw)
Please do not remove MAP_32BIT as it has other uses.
Jamie Lokier wrote:
> Also, is this _only_ useful for thread stacks, or are there other
> memory allocations where 31-bitness affects execution speed on old P4s?lrich
Andi Kleen wrote:
> MAP_32BIT was not actually added for this originally. It
> was originally added for the X server's old dynamic loader, which
> needed 2GB memory.
The dynamic loader of Lush (lush.sourceforge.net) also depends on this.
Since it is tightly coupled with the lush compiler,
removing this capability would cause major trouble.
On the other hand, it does not need to be very fast...
- Leon Bottou
next reply other threads:[~2008-08-21 16:40 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-21 16:35 Leon Bottou [this message]
[not found] <af8810200808121736q76640cc1kb814385072fe9b29@mail.gmail.com>
2008-08-13 0:45 ` Pardo
2008-08-13 10:44 ` Ingo Molnar
2008-08-13 13:35 ` Arjan van de Ven
2008-08-13 14:21 ` Ulrich Drepper
2008-08-13 14:25 ` Ingo Molnar
2008-08-13 14:36 ` Ulrich Drepper
2008-08-13 15:10 ` Ingo Molnar
2008-08-13 15:21 ` Ulrich Drepper
2008-08-13 15:40 ` Ingo Molnar
2008-08-13 15:55 ` Ulrich Drepper
2008-08-13 16:02 ` Ingo Molnar
2008-08-15 15:54 ` Jamie Lokier
2008-08-15 16:03 ` Ingo Molnar
2008-08-15 17:13 ` Ulrich Drepper
2008-08-15 17:19 ` Ingo Molnar
2008-08-15 17:23 ` Ulrich Drepper
2008-08-15 19:00 ` Ingo Molnar
2008-08-13 17:09 ` Linus Torvalds
2008-08-13 18:04 ` Ulrich Drepper
2008-08-13 18:16 ` Arjan van de Ven
2008-08-13 18:22 ` Ulrich Drepper
2008-08-13 16:05 ` H. Peter Anvin
2008-08-13 20:42 ` Andi Kleen
2008-08-13 20:56 ` Andrew Morton
2008-08-13 21:46 ` Andi Kleen
2008-08-15 12:43 ` Ingo Molnar
2008-08-15 13:33 ` Andi Kleen
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