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authorMinchan Kim <minchan@kernel.org>2013-02-22 16:33:58 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-23 17:50:15 -0800
commit194159fbcc0d6ac1351837d3cd7a27a4af0219a6 (patch)
treea5a960a4c8698001db50a987015131bb5d256c6e /include
parentc60514b6314137a9505c60966fda2094b22a2fda (diff)
mm: remove MIGRATE_ISOLATE check in hotpath
Several functions test MIGRATE_ISOLATE and some of those are hotpath but MIGRATE_ISOLATE is used only if we enable CONFIG_MEMORY_ISOLATION(ie, CMA, memory-hotplug and memory-failure) which are not common config option. So let's not add unnecessary overhead and code when we don't enable CONFIG_MEMORY_ISOLATION. Signed-off-by: Minchan Kim <minchan@kernel.org> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mmzone.h2
-rw-r--r--include/linux/page-isolation.h19
2 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 73b64a38b98..4f4c8c26fa9 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -57,7 +57,9 @@ enum {
*/
MIGRATE_CMA,
#endif
+#ifdef CONFIG_MEMORY_ISOLATION
MIGRATE_ISOLATE, /* can't allocate from here */
+#endif
MIGRATE_TYPES
};
diff --git a/include/linux/page-isolation.h b/include/linux/page-isolation.h
index a92061e08d4..3fff8e77406 100644
--- a/include/linux/page-isolation.h
+++ b/include/linux/page-isolation.h
@@ -1,6 +1,25 @@
#ifndef __LINUX_PAGEISOLATION_H
#define __LINUX_PAGEISOLATION_H
+#ifdef CONFIG_MEMORY_ISOLATION
+static inline bool is_migrate_isolate_page(struct page *page)
+{
+ return get_pageblock_migratetype(page) == MIGRATE_ISOLATE;
+}
+static inline bool is_migrate_isolate(int migratetype)
+{
+ return migratetype == MIGRATE_ISOLATE;
+}
+#else
+static inline bool is_migrate_isolate_page(struct page *page)
+{
+ return false;
+}
+static inline bool is_migrate_isolate(int migratetype)
+{
+ return false;
+}
+#endif
bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
bool skip_hwpoisoned_pages);