Messages in this thread Patch in this message | | | From | Kamal Mostafa <> | Subject | [PATCH 3.8 091/166] mm: numa: clear numa hinting information on mprotect | Date | Wed, 15 Jan 2014 13:51:45 -0800 |
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3.8.13.16 -stable review patch. If anyone has any objections, please let me know.
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From: Mel Gorman <mgorman@suse.de>
commit 1667918b6483b12a6496bf54151b827b8235d7b1 upstream.
On a protection change it is no longer clear if the page should be still accessible. This patch clears the NUMA hinting fault bits on a protection change.
Signed-off-by: Mel Gorman <mgorman@suse.de> Reviewed-by: Rik van Riel <riel@redhat.com> Cc: Alex Thorlton <athorlton@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- mm/huge_memory.c | 2 ++ mm/mprotect.c | 2 ++ 2 files changed, 4 insertions(+)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 594b3c1..a67726d 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1504,6 +1504,8 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, ret = 1; if (!prot_numa) { entry = pmdp_get_and_clear(mm, addr, pmd); + if (pmd_numa(entry)) + entry = pmd_mknonnuma(entry); entry = pmd_modify(entry, newprot); ret = HPAGE_PMD_NR; BUG_ON(pmd_write(entry)); diff --git a/mm/mprotect.c b/mm/mprotect.c index 79abf13..c477655 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -56,6 +56,8 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd, if (!prot_numa) { ptent = ptep_modify_prot_start(mm, addr, pte); + if (pte_numa(ptent)) + ptent = pte_mknonnuma(ptent); ptent = pte_modify(ptent, newprot); updated = true; } else { -- 1.8.3.2
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