From: Andi Kleen <ak@suse.de>
To: Denis Vlasenko <vda@port.imtp.ilyichevsk.odessa.ua>
Cc: linux-kernel@vger.kernel.org
Subject: Re: kernel: ldt allocation failed
Date: 06 Feb 2002 14:19:07 +0100 [thread overview]
Message-ID: <p73ofj2lpdg.fsf@oldwotan.suse.de> (raw)
In-Reply-To: <Pine.LNX.4.21.0112070057480.20196-100000@tombigbee.pixar.com.suse.lists.linux.kernel> <5.1.0.14.2.20011207092244.049f6720@pop.cus.cam.ac.uk.suse.lists.linux.kernel> <200202061258.g16CwGt31197@Port.imtp.ilyichevsk.odessa.ua.suse.lists.linux.kernel>
In-Reply-To: Denis Vlasenko's message of "6 Feb 2002 14:09:51 +0100"
Denis Vlasenko <vda@port.imtp.ilyichevsk.odessa.ua> writes:
>
> I am ignorant on the subject, but why LDT is used in Linux at all?
> LDT register can be set to 0, this can speed up task switch time and save
> some memory used for LDT.
glibc thread local data uses an LDT for the segment register.
glibc 2.3 seems to plan to use segment register based thread local data for
even non threaded programs, so it would be a good idea to optimize LDT
allocation a bit (= not allocate 64K of vmalloc space every time
sys_modify_ldt is called - there is only 8MB of it)
-Andi
next parent reply other threads:[~2002-02-06 13:19 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.21.0112070057480.20196-100000@tombigbee.pixar.com.suse.lists.linux.kernel>
[not found] ` <5.1.0.14.2.20011207092244.049f6720@pop.cus.cam.ac.uk.suse.lists.linux.kernel>
[not found] ` <200202061258.g16CwGt31197@Port.imtp.ilyichevsk.odessa.ua.suse.lists.linux.kernel>
2002-02-06 13:19 ` Andi Kleen [this message]
2002-02-06 14:06 ` kernel: ldt allocation failed Dave Jones
2002-02-06 14:13 ` Alan Cox
2002-02-06 14:09 ` Andi Kleen
2002-02-06 14:39 ` Alan Cox
2002-02-06 16:37 ` bert hubert
2002-02-06 15:51 ` Bill Davidsen
2002-02-06 16:08 ` Alan Cox
2002-02-06 16:29 ` John Levon
2002-02-06 18:01 ` Alan Cox
2002-02-06 18:02 ` Denis Vlasenko
2002-02-06 15:12 ` Jakub Jelinek
2002-02-06 18:11 ` Maciej W. Rozycki
2002-02-06 20:19 ` H. Peter Anvin
2002-02-06 21:15 ` Jakub Jelinek
2002-02-06 21:17 ` H. Peter Anvin
2002-02-06 20:21 ` yodaiken
2002-02-06 21:00 ` H. Peter Anvin
2002-02-06 21:31 ` Jakub Jelinek
2002-02-06 22:05 ` H. Peter Anvin
2002-02-06 22:20 ` Jakub Jelinek
2002-02-06 23:35 ` H. Peter Anvin
2002-02-07 0:21 ` Alan Cox
2002-02-07 0:12 ` Jakub Jelinek
2002-02-07 0:15 ` H. Peter Anvin
2002-02-07 0:13 ` H. Peter Anvin
2002-02-06 15:37 ` Alan Cox
[not found] <fa.kit1f7v.j024op@ifi.uio.no>
2001-12-07 7:24 ` Dan Maas
2001-12-07 9:00 ` Kiril Vidimce
2001-12-07 9:15 ` Alan Cox
2001-12-07 9:13 ` Kiril Vidimce
2001-12-07 9:28 ` Alan Cox
2001-12-07 9:26 ` James Davies
2001-12-07 9:43 ` Alan Cox
2001-12-07 13:10 ` James Davies
2001-12-07 13:41 ` Dave Jones
2001-12-07 13:59 ` James Davies
2001-12-07 13:53 ` Alan Cox
2001-12-07 9:45 ` Anton Altaparmakov
2001-12-07 10:38 ` Alan Cox
2002-02-06 16:58 ` Denis Vlasenko
2002-02-06 13:42 ` Alan Cox
2002-02-06 17:20 ` Christoph Hellwig
2001-12-07 10:12 ` Anton Altaparmakov
2001-12-07 5:40 Kiril Vidimce
2001-12-07 5:58 ` Jeffrey H. Ingber
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