On Thu, 23 Jan 2014 09:59:06 +0400 Cyrill Gorcunov <gorcunov@xxxxxxxxx> wrote: > 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. Hang on. We think the problem is that gimp is generating vmas which *should* be merged, but for unknown reasons they differ in VM_SOFTDIRTY, yes? Shouldn't we work out where we're forgetting to set VM_SOFTDIRTY? Putting bandaids over this error when we come to trying to merge the vmas sounds very wrong? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>