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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
parentaf2c1401e6f9177483be4fad876d0073669df9df (diff)
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op-kernel-dev-b0943d61b8fa420180f92f64ef67662b4f6cc493.tar.gz
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>
-rw-r--r--mm/huge_memory.c7
-rw-r--r--mm/migrate.c3
2 files changed, 3 insertions, 7 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 3d2783e..7de1bf8 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1377,13 +1377,6 @@ int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
}
/*
- * The page_table_lock above provides a memory barrier
- * with change_protection_range.
- */
- if (mm_tlb_flush_pending(mm))
- flush_tlb_range(vma, haddr, haddr + HPAGE_PMD_SIZE);
-
- /*
* Migrate the THP to the requested node, returns with page unlocked
* and pmd_numa cleared.
*/
diff --git a/mm/migrate.c b/mm/migrate.c
index cfb4190..e9b7102 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);
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