| Message ID | 1389309496-31735-1-git-send-email-kamal@canonical.com |
|---|---|
| State | New |
| Headers | show |
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index a72d5ca..5d7dc7c 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1506,7 +1506,7 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, /* only check non-shared pages */ if (page_mapcount(page) == 1 && !pmd_numa(*pmd)) { - entry = pmdp_get_and_clear(mm, addr, pmd); + entry = *pmd; entry = pmd_mknuma(entry); ret = HPAGE_PMD_NR; }
This is a note to let you know that I have just added a patch titled mm: numa: do not clear PMD during PTE update scan to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.8.y-queue This patch is scheduled to be released in version 3.8.13.16. If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.8.y.z tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Kamal ------ From d4f8604fc0af93acf07a217f4341ce842dc93cd2 Mon Sep 17 00:00:00 2001 From: Mel Gorman <mgorman@suse.de> Date: Wed, 18 Dec 2013 17:08:36 -0800 Subject: mm: numa: do not clear PMD during PTE update scan commit 5a6dac3ec5f583cc8ee7bc53b5500a207c4ca433 upstream. If the PMD is flushed then a parallel fault in handle_mm_fault() will enter the pmd_none and do_huge_pmd_anonymous_page() path where it'll attempt to insert a huge zero page. This is wasteful so the patch avoids clearing the PMD when setting pmd_numa. 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 +- 1 file changed, 1 insertion(+), 1 deletion(-) -- 1.8.3.2