Messages in this thread | | | From | David Howells <> | Subject | Re: nommu: handling anonymous mmap clearing in userspace rather than kernel | Date | Wed, 02 Apr 2008 15:20:14 +0100 |
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Mike Frysinger <vapier.adi@gmail.com> wrote:
> a workaround: introduce a new no-mmu-only mmap flag MAP_UNINITIALIZE > to signal to the kernel that it should skip the memset(). this way, > userspace malloc() can do mmap(MAP_ANONYMOUS|MAP_UNINITIALIZE) to get > large chunks of memory without affecting any other anonymous mmap() > call.
I think that's reasonable for NOMMU. It's not like the process accessing the uninitialised memory is prevented from accessing anything it wants to anyway.
I would vote that the memset() should only be skipped if requested as there may be programs that call mmap(MAP_ANONYMOUS) expecting the memory they're given to be zeroed out.
David
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