---

yaml --- r: 332469 b: refs/heads/master c: e46a287 h: refs/heads/master i: 332467: b038238 v: v3
git-mirror · Oct 9, 2012 · 04e8cff · 04e8cff
1 parent 29f6e7f
commit 04e8cff
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Showing 6 changed files with 13 additions and 7 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 7a71932d5676b7410ab64d149bad8bde6b0d8632
+refs/heads/master: e46a28790e594c0876d1a84270926abf75460f61
diff --git a/trunk/include/linux/mmzone.h b/trunk/include/linux/mmzone.h
@@ -218,6 +218,8 @@ struct lruvec {
 #define ISOLATE_UNMAPPED	((__force isolate_mode_t)0x2)
 /* Isolate for asynchronous migration */
 #define ISOLATE_ASYNC_MIGRATE	((__force isolate_mode_t)0x4)
+/* Isolate unevictable pages */
+#define ISOLATE_UNEVICTABLE	((__force isolate_mode_t)0x8)
 
 /* LRU Isolation modes. */
 typedef unsigned __bitwise__ isolate_mode_t;

diff --git a/trunk/mm/compaction.c b/trunk/mm/compaction.c
@@ -461,6 +461,7 @@ static bool too_many_isolated(struct zone *zone)
  * @cc:		Compaction control structure.
  * @low_pfn:	The first PFN of the range.
  * @end_pfn:	The one-past-the-last PFN of the range.
+ * @unevictable: true if it allows to isolate unevictable pages
  *
  * Isolate all pages that can be migrated from the range specified by
  * [low_pfn, end_pfn).  Returns zero if there is a fatal signal
@@ -476,7 +477,7 @@ static bool too_many_isolated(struct zone *zone)
  */
 unsigned long
 isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
-			   unsigned long low_pfn, unsigned long end_pfn)
+		unsigned long low_pfn, unsigned long end_pfn, bool unevictable)
 {
 	unsigned long last_pageblock_nr = 0, pageblock_nr;
 	unsigned long nr_scanned = 0, nr_isolated = 0;
@@ -602,6 +603,9 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
 		if (!cc->sync)
 			mode |= ISOLATE_ASYNC_MIGRATE;
 
+		if (unevictable)
+			mode |= ISOLATE_UNEVICTABLE;
+
 		lruvec = mem_cgroup_page_lruvec(page, zone);
 
 		/* Try isolate the page */
@@ -807,7 +811,7 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
 	}
 
 	/* Perform the isolation */
-	low_pfn = isolate_migratepages_range(zone, cc, low_pfn, end_pfn);
+	low_pfn = isolate_migratepages_range(zone, cc, low_pfn, end_pfn, false);
 	if (!low_pfn || cc->contended)
 		return ISOLATE_ABORT;
 

diff --git a/trunk/mm/internal.h b/trunk/mm/internal.h
@@ -138,7 +138,7 @@ isolate_freepages_range(struct compact_control *cc,
 			unsigned long start_pfn, unsigned long end_pfn);
 unsigned long
 isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
-			   unsigned long low_pfn, unsigned long end_pfn);
+	unsigned long low_pfn, unsigned long end_pfn, bool unevictable);
 
 #endif
 

diff --git a/trunk/mm/page_alloc.c b/trunk/mm/page_alloc.c
@@ -5690,7 +5690,7 @@ static int __alloc_contig_migrate_range(struct compact_control *cc,
 		if (list_empty(&cc->migratepages)) {
 			cc->nr_migratepages = 0;
 			pfn = isolate_migratepages_range(cc->zone, cc,
-							 pfn, end);
+							 pfn, end, true);
 			if (!pfn) {
 				ret = -EINTR;
 				break;

diff --git a/trunk/mm/vmscan.c b/trunk/mm/vmscan.c
@@ -1009,8 +1009,8 @@ int __isolate_lru_page(struct page *page, isolate_mode_t mode)
 	if (!PageLRU(page))
 		return ret;
 
-	/* Do not give back unevictable pages for compaction */
-	if (PageUnevictable(page))
+	/* Compaction should not handle unevictable pages but CMA can do so */
+	if (PageUnevictable(page) && !(mode & ISOLATE_UNEVICTABLE))
 		return ret;
 
 	ret = -EBUSY;