[Linux-ia64] [PATCH] Increase size of user stack

[Linux-ia64] [PATCH] Increase size of user stack

[Martin Hicks]

Hello,

The current user stack size limit of 2GB is not big enough for large 
SMP or SSI clusters.  The following patch increases this size from 
2GB to 512GB.  The new size is negotiable, but right now SGI has 
programs that require over 100GB of stack size on a 64 processor 
machine.  Setting the user stack size to 512GB seems like 
a reasonable thing to do for future growth.

The patch is against 2.4.21-bk but it applies against 2.5 as well.

Comments?
mh

-- 
Wild Open Source Inc.                  mort@wildopensource.com


=== include/asm-ia64/a.out.h 1.4 vs edited ==--- 1.4/include/asm-ia64/a.out.h	Thu Feb 28 06:57:29 2002
+++ edited/include/asm-ia64/a.out.h	Mon May  5 16:39:03 2003
@@ -32,7 +32,7 @@
 #ifdef __KERNEL__
 # include <asm/page.h>
 # define STACK_TOP	(0x6000000000000000UL + (1UL << (4*PAGE_SHIFT - 12)) - PAGE_SIZE)
-# define IA64_RBS_BOT	(STACK_TOP - 0x80000000L + PAGE_SIZE)	/* bottom of reg. backing store */
+# define IA64_RBS_BOT	(STACK_TOP - 0x8000000000UL + PAGE_SIZE)	/* bottom of reg. backing store */
 #endif
 
 #endif /* _ASM_IA64_A_OUT_H */

RE: [Linux-ia64] [PATCH] Increase size of user stack

[Howell, David P]

Wouldn't it be better to base this off an rlimit?

Thanks,
Dave Howell


These are my opinions and not official opinions of Intel Corp.

David Howell
Intel Corporation
Telco Server Development
Server Products Division
Voice: (803) 461-6112  Fax: (803) 461-6292

Intel Corporation
Columbia Design Center, CBA-2
250 Berryhill Road, Suite 100
Columbia, SC 29210

david.p.howell@intel.com


-----Original Message-----
From: Martin Hicks [mailto:mort@wildopensource.com] 
Sent: Monday, May 05, 2003 2:19 PM
To: linux-ia64@linuxia64.org
Cc: Bjorn Helgaas; David Mosberger
Subject: [Linux-ia64] [PATCH] Increase size of user stack


Hello,

The current user stack size limit of 2GB is not big enough for large 
SMP or SSI clusters.  The following patch increases this size from 
2GB to 512GB.  The new size is negotiable, but right now SGI has 
programs that require over 100GB of stack size on a 64 processor 
machine.  Setting the user stack size to 512GB seems like 
a reasonable thing to do for future growth.

The patch is against 2.4.21-bk but it applies against 2.5 as well.

Comments?
mh

-- 
Wild Open Source Inc.                  mort@wildopensource.com


===== include/asm-ia64/a.out.h 1.4 vs edited =====
--- 1.4/include/asm-ia64/a.out.h	Thu Feb 28 06:57:29 2002
+++ edited/include/asm-ia64/a.out.h	Mon May  5 16:39:03 2003
@@ -32,7 +32,7 @@
 #ifdef __KERNEL__
 # include <asm/page.h>
 # define STACK_TOP	(0x6000000000000000UL + (1UL << (4*PAGE_SHIFT -
12)) - PAGE_SIZE)
-# define IA64_RBS_BOT	(STACK_TOP - 0x80000000L + PAGE_SIZE)	/*
bottom of reg. backing store */
+# define IA64_RBS_BOT	(STACK_TOP - 0x8000000000UL + PAGE_SIZE)
/* bottom of reg. backing store */
 #endif
 
 #endif /* _ASM_IA64_A_OUT_H */

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Re: [Linux-ia64] [PATCH] Increase size of user stack

[Matthew Wilcox]

On Mon, May 05, 2003 at 12:35:03PM -0700, Howell, David P wrote:
> Wouldn't it be better to base this off an rlimit?

PA-RISC (which has an upwards-gorwing stack) bases this off RLIMIT_STACK.
By default, we set it to 80MB.  Of course, sshd likes to set it to -1
(unlimited), so we limit it to 1GB.  ia64 will presumably want to be
more generous in its clamping value.

I think this is all in the 2.5 tree now; if not you can pick up a recent
pa patch at ftp://ftp.kernel.org/pub/linux/kernel/ports/parisc/v2.5/
and look for it.  90% of that diff is drivers/input, so it's not much
to look through.

-- 
"It's not Hollywood.  War is real, war is primarily not about defeat or
victory, it is about death.  I've seen thousands and thousands of dead bodies.
Do you think I want to have an academic debate on this subject?" -- Robert Fisk