From: Rik van Riel <riel@redhat.com>
To: Davide Libenzi <davidel@xmailserver.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [patch 2/3] MAP_NOZERO - implement sys_brk2()
Date: Tue, 26 Jun 2007 23:07:11 -0400 [thread overview]
Message-ID: <4681D45F.7080309@redhat.com> (raw)
In-Reply-To: <send-serie.davidel@xmailserver.org.29496.1182912260.2>
Davide Libenzi wrote:
> The following patch implements the sys_brk2() syscall, that nothing is
> other than a sys_brk() with an extra "flags" parameter. This can be used
> to pass the new MAP_NOZERO bit, to ask the kernel to hand over non-zero
> pages if possible.
Since programs can get back free()d memory after a malloc(),
with the old contents of the memory intact, surely your
MAP_NONZERO behavior could be the default for programs that
can get away with it?
Maybe we could use some magic ELF header, similar to the
way non-executable stack is handled?
--
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 3:07 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 [this message]
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
2007-06-27 19:22 ` Davide Libenzi
2007-06-27 16:05 ` Davide Libenzi
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