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From: "Martin J. Bligh" <mbligh@aracnet.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Timothy Miller <miller@techsource.com>, linux-kernel@vger.kernel.org
Subject: Re: TASK_UNMAPPED_BASE & stack location
Date: Fri, 25 Apr 2003 16:19:58 -0700	[thread overview]
Message-ID: <10000000.1051312797@[10.10.2.4]> (raw)
In-Reply-To: <3EA9C19E.9020205@zytor.com>

>>>> 128Mb of it? The bottom page, or even a few Mb, sure ... 
>>>> but 128Mb seems somewhat excessive ..
>>> 
>>> Considering that your process space is 4gig, and that that 128Mb doesn't
>>> really exist anywhere (no RAM, no page table entries, nothing), it's
>>> really not excessive.  
>> 
>> I need the virtual space.
> 
> As far as I know, you're perfectly free to move the stack whereever you
> feel like, as long as you map the space first, copy the contents and set
> %esp.  mremap() is useful for this.

Right ... I was just suggesting changing it by default. Was wondering if
anyone knew of anything it'd break. Your issue with NULL pointers is
interesting, but I'm not sure this would really affect that much ... the
stack is normally tiny in comparison.

M.


  reply	other threads:[~2003-04-25 23:07 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
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 [this message]
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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