From: dada1 <dada1@cosmosbay.com>
To: Andi Kleen <ak@suse.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: linux-2.6.1 x86_64 : STACK_TOP and text/data
Date: Tue, 27 Jan 2004 20:45:24 +0100 [thread overview]
Message-ID: <4016BFD4.2040407@cosmosbay.com> (raw)
In-Reply-To: <20040127202930.6c29bbcf.ak@suse.de>
Andi Kleen wrote:
>
>You're right. Thanks for reporting this. This seems to be a 2.6
>specific bug, it didn't happen in 2.4.
>
>I will fix it. It should definitely use PAGE_OFFSET for 64bit
>processes and 4GB for !3GB 32bit processes.
>
>-Andi
>
>
>
>
Another thing I noticed in last glibc CVS (nptl)
Thread stacks are also allocated in the 1GB quadrant :
nptl/sysdeps/x86_64/pthreaddef.h
/* We prefer to have the stack allocated in the low 4GB since this
allows faster context switches. */
#define ARCH_MAP_FLAGS MAP_32BIT
Is this really true ?
Is memory allocated in the low 4GB is faster on x86_64 (64bit kernel,
64 bit user prog ?)
Thank you
Eric Dumazet
next prev parent reply other threads:[~2004-01-27 19:46 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <OFCE30A640.024A04A1-ONC1256E28.003023EA-C1256E28.0030BF4E@de.ibm.com.suse.lists.linux.kernel>
[not found] ` <40162E9A.1080005@cosmosbay.com.suse.lists.linux.kernel>
2004-01-27 18:24 ` linux-2.6.1 x86_64 : STACK_TOP and text/data Andi Kleen
2004-01-27 18:57 ` dada1
2004-01-27 19:29 ` Andi Kleen
2004-01-27 19:45 ` dada1 [this message]
2004-01-27 19:57 ` Andi Kleen
2004-01-27 8:52 Cset 1.1490.4.201 - dasd naming Martin Schwidefsky
2004-01-27 9:25 ` linux-2.6.1 x86_64 : STACK_TOP and text/data dada1
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