Messages in this thread | | | Date | Fri, 16 Nov 2012 09:09:37 -0500 | From | Rik van Riel <> | Subject | Re: [PATCH 07/43] mm: numa: Support NUMA hinting page faults from gup/gup_fast |
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On 11/16/2012 06:22 AM, Mel Gorman wrote: > From: Andrea Arcangeli <aarcange@redhat.com> > > Introduce FOLL_NUMA to tell follow_page to check > pte/pmd_numa. get_user_pages must use FOLL_NUMA, and it's safe to do > so because it always invokes handle_mm_fault and retries the > follow_page later. > > KVM secondary MMU page faults will trigger the NUMA hinting page > faults through gup_fast -> get_user_pages -> follow_page -> > handle_mm_fault. > > Other follow_page callers like KSM should not use FOLL_NUMA, or they > would fail to get the pages if they use follow_page instead of > get_user_pages. > > [ This patch was picked up from the AutoNUMA tree. ] > > Originally-by: Andrea Arcangeli <aarcange@redhat.com> > Cc: Linus Torvalds <torvalds@linux-foundation.org> > Cc: Andrew Morton <akpm@linux-foundation.org> > Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> > Cc: Andrea Arcangeli <aarcange@redhat.com> > Cc: Rik van Riel <riel@redhat.com> > [ ported to this tree. ] > Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Rik van Riel <riel@redhat.com>
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