From: Andi Kleen <ak@muc.de>
To: mikpe@csd.uu.se
Cc: Andi Kleen <ak@muc.de>, Ulrich Drepper <drepper@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: hammer: MAP_32BIT
Date: Fri, 9 May 2003 13:38:45 +0200 [thread overview]
Message-ID: <20030509113845.GA4586@averell> (raw)
In-Reply-To: <16059.37067.925423.998433@gargle.gargle.HOWL>
On Fri, May 09, 2003 at 01:28:11PM +0200, mikpe@csd.uu.se wrote:
> I have a potential use for mmap()ing in the low 4GB on x86_64.
Just use MAP_32BIT
> Sounds like your MAP_32BIT really is MAP_31BIT :-( which is too limiting.
> What about a more generic way of indicating which parts of the address
> space one wants? The simplest that would work for me is a single byte
> 'nrbits' specifying the target address space as [0 .. 2^nrbits-1].
> This could be specified on a per-mmap() basis or as a settable process attribute.
On x86-64 an mmap extension for that would be fine, but on i386 you get
problems because mmap64() already maxes out the argument limit and you
cannot add more.
You could only implement it with a structure in memory pointed to by an
argument, which would be ugly.
prctl is probably better. You really want [start; end] right ?
Pity that task_struct is already so bloated, so every new entry hurts.
-Andi
next prev parent reply other threads:[~2003-05-09 11:26 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-09 7:35 hammer: MAP_32BIT Ulrich Drepper
2003-05-09 9:20 ` Andi Kleen
2003-05-09 11:28 ` mikpe
2003-05-09 11:38 ` Andi Kleen [this message]
2003-05-09 11:52 ` mikpe
2003-05-09 12:16 ` Andi Kleen
2003-05-09 18:11 ` H. Peter Anvin
2003-05-09 19:24 ` Ulrich Drepper
2003-05-09 20:55 ` H. Peter Anvin
2003-05-09 21:45 ` Ulrich Drepper
2003-05-09 22:07 ` H. Peter Anvin
2003-05-09 22:20 ` Ulrich Drepper
2003-05-09 22:21 ` H. Peter Anvin
2003-05-09 22:20 ` Timothy Miller
2003-05-09 22:20 ` H. Peter Anvin
2003-05-09 22:46 ` Timothy Miller
2003-05-09 23:24 ` H. Peter Anvin
2003-05-13 14:25 ` Timothy Miller
2003-05-09 22:22 ` Ulrich Drepper
2003-05-09 22:53 ` Timothy Miller
2003-05-09 23:24 ` Ulrich Drepper
2003-05-10 0:00 ` Edgar Toernig
2003-05-10 0:58 ` Ulrich Drepper
2003-05-10 2:51 ` Edgar Toernig
2003-05-09 17:36 ` H. Peter Anvin
2003-05-09 17:39 ` Ulrich Drepper
2003-05-10 1:48 ` Andi Kleen
2003-05-10 20:10 ` David Woodhouse
2003-05-13 18:54 ` H. Peter Anvin
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