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From: "H. Peter Anvin" <hpa@zytor.com>
To: "Martin J. Bligh" <mbligh@aracnet.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: TASK_UNMAPPED_BASE & stack location
Date: Fri, 25 Apr 2003 14:12:24 -0700	[thread overview]
Message-ID: <3EA9A4B8.2030304@zytor.com> (raw)
In-Reply-To: <1750000.1051305030@[10.10.2.4]>

Martin J. Bligh wrote:
>>>Is there any good reason we can't remove TASK_UNMAPPED_BASE, and just
>>>shove libraries directly above the program text? Red Hat seems to have
>>>patches to dynamically tune it on a per-processes basis anyway ...
>>>
>>>Moreover, can we put the stack back where it's meant to be, below the
>>>program text, in that wasted 128MB of virtual space? Who really wants 
>>>
>>>>128MB of stack anyway (and can't fix their app)?
>>
>>That space is NULL pointer trap zone.  NULL pointer trapping -> good.
> 
> 
> 128Mb of it? The bottom page, or even a few Mb, sure ... 
> but 128Mb seems somewhat excessive ...
> 

Perhaps, but large data structures can easily generate reasonably large
values when indirected.

	-hpa



  reply	other threads:[~2003-04-25 21:00 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-04-25 20:32 TASK_UNMAPPED_BASE & stack location Martin J. Bligh
2003-04-25 21:01 ` H. Peter Anvin
2003-04-25 21:10   ` Martin J. Bligh
2003-04-25 21:12     ` H. Peter Anvin [this message]
2003-04-25 22:02     ` Timothy Miller
2003-04-25 22:06       ` Martin J. Bligh
2003-04-25 23:15         ` H. Peter Anvin
2003-04-25 23:19           ` Martin J. Bligh
2003-04-26  0:11             ` H. Peter Anvin
2003-04-26  0:42         ` Hugh Dickins
2003-04-26  5:15           ` Martin J. Bligh
2003-04-26 10:40         ` jlnance
2003-04-26 15:39           ` Martin J. Bligh
2003-04-25 23:52 ` badari
2003-04-25 23:58   ` William Lee Irwin III
2003-04-26 14:37 ` Rik van Riel
2003-04-26 15:03   ` William Lee Irwin III
     [not found] <20030425204012$4424@gated-at.bofh.it>
2003-04-25 21:54 ` Andi Kleen
2003-04-25 22:06   ` William Lee Irwin III
2003-04-25 22:10   ` Martin J. Bligh
     [not found] <20030425220018$6219@gated-at.bofh.it>
     [not found] ` <20030425220018$76b1@gated-at.bofh.it>
     [not found]   ` <20030425225007$3fae@gated-at.bofh.it>
2003-04-25 22:58     ` Andi Kleen
2003-04-25 23:13       ` Hui Huang
2003-04-25 23:02 Chuck Ebbert
2003-04-25 23:02 Chuck Ebbert

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