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| author | Mel Gorman <mgorman@suse.de> | 2013-12-18 17:08:34 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-12-18 19:04:51 -0800 |
| commit | 67f87463d3a3362424efcbe8b40e4772fd34fc61 (patch) | |
| tree | b1c6f03215b39dc696c8801bc91310e0aa9ffd47 /mm/compaction.c | |
| parent | f714f4f20e59ea6eea264a86b9a51fd51b88fc54 (diff) | |
| download | op-kernel-dev-67f87463d3a3362424efcbe8b40e4772fd34fc61.zip op-kernel-dev-67f87463d3a3362424efcbe8b40e4772fd34fc61.tar.gz | |
mm: clear pmd_numa before invalidating
On x86, PMD entries are similar to _PAGE_PROTNONE protection and are
handled as NUMA hinting faults. The following two page table protection
bits are what defines them
_PAGE_NUMA:set _PAGE_PRESENT:clear
A PMD is considered present if any of the _PAGE_PRESENT, _PAGE_PROTNONE,
_PAGE_PSE or _PAGE_NUMA bits are set. If pmdp_invalidate encounters a
pmd_numa, it clears the present bit leaving _PAGE_NUMA which will be
considered not present by the CPU but present by pmd_present. The
existing caller of pmdp_invalidate should handle it but it's an
inconsistent state for a PMD. This patch keeps the state consistent
when calling pmdp_invalidate.
Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Alex Thorlton <athorlton@sgi.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/compaction.c')
0 files changed, 0 insertions, 0 deletions
