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authorRik van Riel <riel@redhat.com>2012-11-06 09:54:47 +0000
committerMel Gorman <mgorman@suse.de>2012-12-11 14:28:33 +0000
commit0f9a921cf9bf3b524feddc484e2b4d070b7ca0d0 (patch)
tree4cad5a73d90a09863cb7615685f93e59192f256f /fs/freevxfs
parentf4a75d2eb7b1e2206094b901be09adb31ba63681 (diff)
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x86: mm: only do a local tlb flush in ptep_set_access_flags()
The function ptep_set_access_flags() is only ever invoked to set access flags or add write permission on a PTE. The write bit is only ever set together with the dirty bit. Because we only ever upgrade a PTE, it is safe to skip flushing entries on remote TLBs. The worst that can happen is a spurious page fault on other CPUs, which would flush that TLB entry. Lazily letting another CPU incur a spurious page fault occasionally is (much!) cheaper than aggressively flushing everybody else's TLB. Signed-off-by: Rik van Riel <riel@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: Michel Lespinasse <walken@google.com> Cc: Ingo Molnar <mingo@kernel.org>
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