On Thu, Jan 23, 2014 at 02:33:25AM +0400, Cyrill Gorcunov wrote: > On Wed, Jan 22, 2014 at 11:19:28PM +0400, Cyrill Gorcunov wrote: > > > commit. Test case was simple -- try and open the large file described in > > > the bug. I did not investigate the patch itself as I'm just reporting > > > the results of the bisection. If I had to guess, I'd say that VMA > > > merging has been affected. > > > > Thanks a lot for report, Mel! I'm investigating... > > Mel, here is a quick fix for bring merging back (just in case if you > have a minute to test it and confirm the merging were affected). It > seems I've lost setting up vma-softdirty bit somewhere and procedure > which tests vma flags mathcing fails, will continue investigating/testing > tomorrow. The test case passes with this patch applied to 3.13 so that appears to confirm that this is related to VM_SOFTDIRTY preventing merges. Unfortunately I did not have slabinfo tracking enabled to double check the number of vm_area_structs in teh system. -- Mel Gorman SUSE Labs -- 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>