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authorMel Gorman <mgorman@suse.de>2013-12-18 17:08:46 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-12-18 19:04:51 -0800
commitb0943d61b8fa420180f92f64ef67662b4f6cc493 (patch)
treece2a5fb0e890e51ca1620be685269f9245ddb804 /mm/migrate.c
parentaf2c1401e6f9177483be4fad876d0073669df9df (diff)
mm: numa: defer TLB flush for THP migration as long as possible
THP migration can fail for a variety of reasons. Avoid flushing the TLB to deal with THP migration races until the copy is ready to start. 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/migrate.c')
-rw-r--r--mm/migrate.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index cfb41908526..e9b71020133 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1759,6 +1759,9 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm,
goto out_fail;
}
+ if (mm_tlb_flush_pending(mm))
+ flush_tlb_range(vma, mmun_start, mmun_end);
+
/* Prepare a page as a migration target */
__set_page_locked(new_page);
SetPageSwapBacked(new_page);