Re: [Bug 67651] Bisected: Lots of fragmented mmaps cause gimp tofail in 3.12 after exceeding vm_max_map_count

From: Cyrill Gorcunov
Date: Thu Jan 23 2014 - 00:59:18 EST

On Wed, Jan 22, 2014 at 02:45:53PM -0800, Andy Lutomirski wrote:
> >
> > Thus when user space application track memory changes now it can detect if
> > vma area is renewed.
> Presumably some path is failing to set VM_SOFTDIRTY, thus preventing mms
> from being merged.
> That being said, this could cause vma blowups for programs that are
> actually using this thing.

Hi Andy, indeed, this could happen. The easiest way is to ignore softdirty bit
when we're trying to merge vmas and set it one new merged. I think this should
be correct. Once I finish I'll send the patch.

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