From: Rik van Riel <riel@redhat.com>
To: Ulrich Drepper <drepper@gmail.com>
Cc: Hugh Dickins <hugh@veritas.com>,
Davide Libenzi <davidel@xmailserver.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [patch 2/3] MAP_NOZERO - implement sys_brk2()
Date: Wed, 27 Jun 2007 15:00:00 -0400 [thread overview]
Message-ID: <4682B3B0.2040500@redhat.com> (raw)
In-Reply-To: <a36005b50706271001o191f3e24n83b25988739429fb@mail.gmail.com>
Ulrich Drepper wrote:
> On 6/27/07, Hugh Dickins <hugh@veritas.com> wrote:
>> Not so: if an mmap can be done by extending either adjacent vma (prot
>> and flags and file and offset all match up), that's what's done and no
>> separate vma is created. (And adjacent vmas get merged when mprotect
>> removes the difference in protection.)
>
> mmap return values are randomized. If they would be mergable
> something would be wrong.
You can easily pass a hint address to mmap(), causing it to
extend a malloc arena instead of creating a new VMA.
--
Politics is the struggle between those who want to make their country
the best in the world, and those who believe it already is. Each group
calls the other unpatriotic.
next prev parent reply other threads:[~2007-06-27 19:00 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-27 2:44 [patch 2/3] MAP_NOZERO - implement sys_brk2() Davide Libenzi
2007-06-27 3:07 ` Rik van Riel
2007-06-27 3:33 ` Davide Libenzi
2007-06-27 3:45 ` Ulrich Drepper
2007-06-27 4:11 ` Rik van Riel
2007-06-27 5:04 ` Ulrich Drepper
2007-06-27 3:48 ` Ulrich Drepper
2007-06-27 3:55 ` Davide Libenzi
2007-06-27 5:02 ` Ulrich Drepper
2007-06-27 12:32 ` Hugh Dickins
2007-06-27 15:59 ` Davide Libenzi
2007-06-27 17:01 ` Ulrich Drepper
2007-06-27 17:43 ` Hugh Dickins
2007-06-27 18:13 ` Davide Libenzi
2007-06-27 18:32 ` Hugh Dickins
2007-06-27 18:45 ` Davide Libenzi
2007-06-27 22:11 ` Nicholas Miell
2007-06-28 0:17 ` Davide Libenzi
2007-06-28 2:58 ` Davide Libenzi
2007-06-30 7:52 ` Andrew Morton
2007-06-27 18:52 ` Ulrich Drepper
2007-06-27 19:32 ` Hugh Dickins
2007-06-27 19:00 ` Rik van Riel [this message]
2007-06-27 19:22 ` Davide Libenzi
2007-06-27 16:05 ` Davide Libenzi
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