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| author | Rik van Riel <riel@redhat.com> | 2012-10-09 15:31:59 +0200 |
|---|---|---|
| committer | Mel Gorman <mgorman@suse.de> | 2012-12-11 14:28:34 +0000 |
| commit | 8d1acce4537c4e2f5889ed9ba9b8eddb80d99820 (patch) | |
| tree | 8032b026c25b3394613abde6d0f22529a1ef4e2a /mm/pgtable-generic.c | |
| parent | 2c3cf556b2f7ab5823195766eddec6f1a43134f5 (diff) | |
| download | lwn-8d1acce4537c4e2f5889ed9ba9b8eddb80d99820.tar.gz lwn-8d1acce4537c4e2f5889ed9ba9b8eddb80d99820.zip | |
mm: Only flush the TLB when clearing an accessible pte
If ptep_clear_flush() is called to clear a page table entry that is
accessible anyway by the CPU, eg. a _PAGE_PROTNONE page table entry,
there is no need to flush the TLB on remote CPUs.
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/n/tip-vm3rkzevahelwhejx5uwm8ex@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'mm/pgtable-generic.c')
| -rw-r--r-- | mm/pgtable-generic.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c index d8397da42fe6..0c8323fe6c8f 100644 --- a/mm/pgtable-generic.c +++ b/mm/pgtable-generic.c @@ -88,7 +88,8 @@ pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address, { pte_t pte; pte = ptep_get_and_clear((vma)->vm_mm, address, ptep); - flush_tlb_page(vma, address); + if (pte_accessible(pte)) + flush_tlb_page(vma, address); return pte; } #endif |