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SubjectRe: [PATCH v2] NOMMU: fix malloc performance by adding uninitialized flag
On Tue, Oct 13, 2009 at 07:20:21AM -0400, Mike Frysinger wrote:
> From: Jie Zhang <jie.zhang@analog.com>
>
> The NOMMU code currently clears all anonymous mmapped memory. While this
> is what we want in the default case, all memory allocation from userspace
> under NOMMU has to go through this interface, including malloc() which is
> allowed to return uninitialized memory. This can easily be a significant
> performance penalty. So for constrained embedded systems were security is
> irrelevant, allow people to avoid clearing memory unnecessarily.
>
> This also alters the ELF-FDPIC binfmt such that it obtains uninitialised
> memory for the brk and stack region.
>
> Signed-off-by: Jie Zhang <jie.zhang@analog.com>
> Signed-off-by: Robin Getz <rgetz@analog.com>
> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
> Signed-off-by: David Howells <dhowells@redhat.com>

Acked-by: Paul Mundt <lethal@linux-sh.org>


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