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
next prev parent 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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