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From: Hugh Dickins <hugh@veritas.com>
To: "Martin J. Bligh" <mbligh@aracnet.com>
Cc: Timothy Miller <miller@techsource.com>,
	"H. Peter Anvin" <hpa@zytor.com>, <linux-kernel@vger.kernel.org>
Subject: Re: TASK_UNMAPPED_BASE & stack location
Date: Sat, 26 Apr 2003 01:42:51 +0100 (BST)	[thread overview]
Message-ID: <Pine.LNX.4.44.0304260138380.1229-100000@localhost.localdomain> (raw)
In-Reply-To: <3280000.1051308382@[10.10.2.4]>

On Fri, 25 Apr 2003, Martin J. Bligh wrote:
> >> 128Mb of it? The bottom page, or even a few Mb, sure ... 
> >> but 128Mb seems somewhat excessive ..

Yes.

> > 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.

Plus you would (very often) get more physical.  i386 ELF text typically
begins at 0x08048000: putting stack just below text in many cases shares
page table between stack+text+data, and saves the page table at top of
user address space.

Hugh


  parent reply	other threads:[~2003-04-26  0:28 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
2003-04-26  0:11             ` H. Peter Anvin
2003-04-26  0:42         ` Hugh Dickins [this message]
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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