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authorMel Gorman <mel@csn.ul.ie>2011-01-13 15:45:57 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-13 17:32:34 -0800
commit77f1fe6b08b13a87391549c8a820ddc817b6f50e (patch)
tree720865bd0994da3787b6f37d33b2ee4c26a2de6c /mm/memory-failure.c
parent3e7d344970673c5334cf7b5bb27c8c0942b06126 (diff)
downloadop-kernel-dev-77f1fe6b08b13a87391549c8a820ddc817b6f50e.zip
op-kernel-dev-77f1fe6b08b13a87391549c8a820ddc817b6f50e.tar.gz
mm: migration: allow migration to operate asynchronously and avoid synchronous compaction in the faster path
Migration synchronously waits for writeback if the initial passes fails. Callers of memory compaction do not necessarily want this behaviour if the caller is latency sensitive or expects that synchronous migration is not going to have a significantly better success rate. This patch adds a sync parameter to migrate_pages() allowing the caller to indicate if wait_on_page_writeback() is allowed within migration or not. For reclaim/compaction, try_to_compact_pages() is first called asynchronously, direct reclaim runs and then try_to_compact_pages() is called synchronously as there is a greater expectation that it'll succeed. [akpm@linux-foundation.org: build/merge fix] Signed-off-by: Mel Gorman <mel@csn.ul.ie> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Rik van Riel <riel@redhat.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory-failure.c')
-rw-r--r--mm/memory-failure.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 46ab2c0..2323a80 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1290,9 +1290,10 @@ static int soft_offline_huge_page(struct page *page, int flags)
/* Keep page count to indicate a given hugepage is isolated. */
list_add(&hpage->lru, &pagelist);
- ret = migrate_huge_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL, 0);
+ ret = migrate_huge_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL, 0,
+ true);
if (ret) {
- putback_lru_pages(&pagelist);
+ putback_lru_pages(&pagelist);
pr_debug("soft offline: %#lx: migration failed %d, type %lx\n",
pfn, ret, page->flags);
if (ret > 0)
@@ -1413,7 +1414,8 @@ int soft_offline_page(struct page *page, int flags)
LIST_HEAD(pagelist);
list_add(&page->lru, &pagelist);
- ret = migrate_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL, 0);
+ ret = migrate_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL,
+ 0, true);
if (ret) {
pr_info("soft offline: %#lx: migration failed %d, type %lx\n",
pfn, ret, page->flags);
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