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| author | Andrea Arcangeli | 2012-10-05 21:36:27 +0200 |
|---|---|---|
| committer | Mel Gorman | 2012-12-11 15:42:37 +0100 |
| commit | 0b9d705297b273657923518dbea2377cd03532ed (patch) | |
| tree | 9049d172d6fcd71790a4689c7fed62a912516265 /mm/huge_memory.c | |
| parent | mm: numa: pte_numa() and pmd_numa() (diff) | |
| download | kernel-qcow2-linux-0b9d705297b273657923518dbea2377cd03532ed.tar.gz kernel-qcow2-linux-0b9d705297b273657923518dbea2377cd03532ed.tar.xz kernel-qcow2-linux-0b9d705297b273657923518dbea2377cd03532ed.zip | |
mm: numa: Support NUMA hinting page faults from gup/gup_fast
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>
Diffstat (limited to 'mm/huge_memory.c')
0 files changed, 0 insertions, 0 deletions