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| author | Mel Gorman | 2013-10-07 12:28:48 +0200 |
|---|---|---|
| committer | Ingo Molnar | 2013-10-09 12:39:48 +0200 |
| commit | e920e14ca29b0b2a981cfc90e4e20edd6f078d19 (patch) | |
| tree | e8f8530aaddb664bc811289aa0e096890a40dd2e /mm/huge_memory.c | |
| parent | mm: Account for a THP NUMA hinting update as one PTE update (diff) | |
| download | kernel-qcow2-linux-e920e14ca29b0b2a981cfc90e4e20edd6f078d19.tar.gz kernel-qcow2-linux-e920e14ca29b0b2a981cfc90e4e20edd6f078d19.tar.xz kernel-qcow2-linux-e920e14ca29b0b2a981cfc90e4e20edd6f078d19.zip | |
mm: Do not flush TLB during protection change if !pte_present && !migration_entry
NUMA PTE scanning is expensive both in terms of the scanning itself and
the TLB flush if there are any updates. Currently non-present PTEs are
accounted for as an update and incurring a TLB flush where it is only
necessary for anonymous migration entries. This patch addresses the
problem and should reduce TLB flushes.
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1381141781-10992-11-git-send-email-mgorman@suse.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'mm/huge_memory.c')
0 files changed, 0 insertions, 0 deletions