Revert "mm: compaction: handle incorrect MIGRATE_UNMOVABLE type pageblocks"

This reverts commit 5ceb9ce6fe9462a298bb2cd5c9f1ca6cb80a0199.

That commit seems to be the cause of the mm compation list corruption
issues that Dave Jones reported.  The locking (or rather, absense
there-of) is dubious, as is the use of the 'page' variable once it has
been found to be outside the pageblock range.

So revert it for now, we can re-visit this for 3.6.  If we even need to:
as Minchan Kim says, "The patch wasn't a bug fix and even test workload
was very theoretical".

Reported-and-tested-by: Dave Jones <davej@redhat.com>
Acked-by: Hugh Dickins <hughd@google.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 23 insertions, 119 deletions

diff --git a/mm/compaction.c b/mm/compaction.c
index 4ac338af5120..7ea259d82a99 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -236,7 +236,7 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
          */
         while (unlikely(too_many_isolated(zone))) {
                 /* async migration should just abort */
-                if (cc->mode != COMPACT_SYNC)
+                if (!cc->sync)
                         return 0;
 
                 congestion_wait(BLK_RW_ASYNC, HZ/10);
@@ -304,8 +304,7 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
                  * satisfies the allocation
                  */
                 pageblock_nr = low_pfn >> pageblock_order;
-                if (cc->mode != COMPACT_SYNC &&
-                    last_pageblock_nr != pageblock_nr &&
+                if (!cc->sync && last_pageblock_nr != pageblock_nr &&
                     !migrate_async_suitable(get_pageblock_migratetype(page))) {
                         low_pfn += pageblock_nr_pages;
                         low_pfn = ALIGN(low_pfn, pageblock_nr_pages) - 1;
@@ -326,7 +325,7 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
                         continue;
                 }
 
-                if (cc->mode != COMPACT_SYNC)
+                if (!cc->sync)
                         mode |= ISOLATE_ASYNC_MIGRATE;
 
                 lruvec = mem_cgroup_page_lruvec(page, zone);
@@ -361,90 +360,27 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
 
 #endif /* CONFIG_COMPACTION || CONFIG_CMA */
 #ifdef CONFIG_COMPACTION
-/*
- * Returns true if MIGRATE_UNMOVABLE pageblock was successfully
- * converted to MIGRATE_MOVABLE type, false otherwise.
- */
-static bool rescue_unmovable_pageblock(struct page *page)
-{
-        unsigned long pfn, start_pfn, end_pfn;
-        struct page *start_page, *end_page;
-
-        pfn = page_to_pfn(page);
-        start_pfn = pfn & ~(pageblock_nr_pages - 1);
-        end_pfn = start_pfn + pageblock_nr_pages;
-
-        start_page = pfn_to_page(start_pfn);
-        end_page = pfn_to_page(end_pfn);
-
-        /* Do not deal with pageblocks that overlap zones */
-        if (page_zone(start_page) != page_zone(end_page))
-                return false;
-
-        for (page = start_page, pfn = start_pfn; page < end_page; pfn++,
-                                                                  page++) {
-                if (!pfn_valid_within(pfn))
-                        continue;
-
-                if (PageBuddy(page)) {
-                        int order = page_order(page);
-
-                        pfn += (1 << order) - 1;
-                        page += (1 << order) - 1;
-
-                        continue;
-                } else if (page_count(page) == 0 || PageLRU(page))
-                        continue;
-
-                return false;
-        }
-
-        set_pageblock_migratetype(page, MIGRATE_MOVABLE);
-        move_freepages_block(page_zone(page), page, MIGRATE_MOVABLE);
-        return true;
-}
 
-enum smt_result {
-        GOOD_AS_MIGRATION_TARGET,
-        FAIL_UNMOVABLE_TARGET,
-        FAIL_BAD_TARGET,
-};
-
-/*
- * Returns GOOD_AS_MIGRATION_TARGET if the page is within a block
- * suitable for migration to, FAIL_UNMOVABLE_TARGET if the page
- * is within a MIGRATE_UNMOVABLE block, FAIL_BAD_TARGET otherwise.
- */
-static enum smt_result suitable_migration_target(struct page *page,
-                                      struct compact_control *cc)
+/* Returns true if the page is within a block suitable for migration to */
+static bool suitable_migration_target(struct page *page)
 {
 
         int migratetype = get_pageblock_migratetype(page);
 
         /* Don't interfere with memory hot-remove or the min_free_kbytes blocks */
         if (migratetype == MIGRATE_ISOLATE || migratetype == MIGRATE_RESERVE)
-                return FAIL_BAD_TARGET;
+                return false;
 
         /* If the page is a large free page, then allow migration */
         if (PageBuddy(page) && page_order(page) >= pageblock_order)
-                return GOOD_AS_MIGRATION_TARGET;
+                return true;
 
         /* If the block is MIGRATE_MOVABLE or MIGRATE_CMA, allow migration */
-        if (cc->mode != COMPACT_ASYNC_UNMOVABLE &&
-            migrate_async_suitable(migratetype))
-                return GOOD_AS_MIGRATION_TARGET;
-
-        if (cc->mode == COMPACT_ASYNC_MOVABLE &&
-            migratetype == MIGRATE_UNMOVABLE)
-                return FAIL_UNMOVABLE_TARGET;
-
-        if (cc->mode != COMPACT_ASYNC_MOVABLE &&
-            migratetype == MIGRATE_UNMOVABLE &&
-            rescue_unmovable_pageblock(page))
-                return GOOD_AS_MIGRATION_TARGET;
+        if (migrate_async_suitable(migratetype))
+                return true;
 
         /* Otherwise skip the block */
-        return FAIL_BAD_TARGET;
+        return false;
 }
 
 /*
@@ -478,13 +414,6 @@ static void isolate_freepages(struct zone *zone,
         zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages;
 
         /*
-         * isolate_freepages() may be called more than once during
-         * compact_zone_order() run and we want only the most recent
-         * count.
-         */
-        cc->nr_pageblocks_skipped = 0;
-
-        /*
          * Isolate free pages until enough are available to migrate the
          * pages on cc->migratepages. We stop searching if the migrate
          * and free page scanners meet or enough free pages are isolated.
@@ -492,7 +421,6 @@ static void isolate_freepages(struct zone *zone,
         for (; pfn > low_pfn && cc->nr_migratepages > nr_freepages;
                                         pfn -= pageblock_nr_pages) {
                 unsigned long isolated;
-                enum smt_result ret;
 
                 if (!pfn_valid(pfn))
                         continue;
@@ -509,12 +437,9 @@ static void isolate_freepages(struct zone *zone,
                         continue;
 
                 /* Check the block is suitable for migration */
-                ret = suitable_migration_target(page, cc);
-                if (ret != GOOD_AS_MIGRATION_TARGET) {
-                        if (ret == FAIL_UNMOVABLE_TARGET)
-                                cc->nr_pageblocks_skipped++;
+                if (!suitable_migration_target(page))
                         continue;
-                }
+
                 /*
                  * Found a block suitable for isolating free pages from. Now
                  * we disabled interrupts, double check things are ok and
@@ -523,14 +448,12 @@ static void isolate_freepages(struct zone *zone,
                  */
                 isolated = 0;
                 spin_lock_irqsave(&zone->lock, flags);
-                ret = suitable_migration_target(page, cc);
-                if (ret == GOOD_AS_MIGRATION_TARGET) {
+                if (suitable_migration_target(page)) {
                         end_pfn = min(pfn + pageblock_nr_pages, zone_end_pfn);
                         isolated = isolate_freepages_block(pfn, end_pfn,
                                                            freelist, false);
                         nr_freepages += isolated;
-                } else if (ret == FAIL_UNMOVABLE_TARGET)
-                        cc->nr_pageblocks_skipped++;
+                }
                 spin_unlock_irqrestore(&zone->lock, flags);
 
                 /*
@@ -762,9 +685,8 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
 
                 nr_migrate = cc->nr_migratepages;
                 err = migrate_pages(&cc->migratepages, compaction_alloc,
-                        (unsigned long)&cc->freepages, false,
-                        (cc->mode == COMPACT_SYNC) ? MIGRATE_SYNC_LIGHT
-                                                      : MIGRATE_ASYNC);
+                                (unsigned long)cc, false,
+                                cc->sync ? MIGRATE_SYNC_LIGHT : MIGRATE_ASYNC);
                 update_nr_listpages(cc);
                 nr_remaining = cc->nr_migratepages;
 
@@ -793,8 +715,7 @@ out:
 
 static unsigned long compact_zone_order(struct zone *zone,
                                  int order, gfp_t gfp_mask,
-                                 enum compact_mode mode,
-                                 unsigned long *nr_pageblocks_skipped)
+                                 bool sync)
 {
         struct compact_control cc = {
                 .nr_freepages = 0,
@@ -802,17 +723,12 @@ static unsigned long compact_zone_order(struct zone *zone,
                 .order = order,
                 .migratetype = allocflags_to_migratetype(gfp_mask),
                 .zone = zone,
-                .mode = mode,
+                .sync = sync,
         };
-        unsigned long rc;
-
         INIT_LIST_HEAD(&cc.freepages);
         INIT_LIST_HEAD(&cc.migratepages);
 
-        rc = compact_zone(zone, &cc);
-        *nr_pageblocks_skipped = cc.nr_pageblocks_skipped;
-
-        return rc;
+        return compact_zone(zone, &cc);
 }
 
 int sysctl_extfrag_threshold = 500;
@@ -837,8 +753,6 @@ unsigned long try_to_compact_pages(struct zonelist *zonelist,
         struct zoneref *z;
         struct zone *zone;
         int rc = COMPACT_SKIPPED;
-        unsigned long nr_pageblocks_skipped;
-        enum compact_mode mode;
 
         /*
          * Check whether it is worth even starting compaction. The order check is
@@ -855,22 +769,12 @@ unsigned long try_to_compact_pages(struct zonelist *zonelist,
                                                                 nodemask) {
                 int status;
 
-                mode = sync ? COMPACT_SYNC : COMPACT_ASYNC_MOVABLE;
-retry:
-                status = compact_zone_order(zone, order, gfp_mask, mode,
-                                                &nr_pageblocks_skipped);
+                status = compact_zone_order(zone, order, gfp_mask, sync);
                 rc = max(status, rc);
 
                 /* If a normal allocation would succeed, stop compacting */
                 if (zone_watermark_ok(zone, order, low_wmark_pages(zone), 0, 0))
                         break;
-
-                if (rc == COMPACT_COMPLETE && mode == COMPACT_ASYNC_MOVABLE) {
-                        if (nr_pageblocks_skipped) {
-                                mode = COMPACT_ASYNC_UNMOVABLE;
-                                goto retry;
-                        }
-                }
         }
 
         return rc;
@@ -904,7 +808,7 @@ static int __compact_pgdat(pg_data_t *pgdat, struct compact_control *cc)
                         if (ok && cc->order > zone->compact_order_failed)
                                 zone->compact_order_failed = cc->order + 1;
                         /* Currently async compaction is never deferred. */
-                        else if (!ok && cc->mode == COMPACT_SYNC)
+                        else if (!ok && cc->sync)
                                 defer_compaction(zone, cc->order);
                 }
 
@@ -919,7 +823,7 @@ int compact_pgdat(pg_data_t *pgdat, int order)
 {
         struct compact_control cc = {
                 .order = order,
-                .mode = COMPACT_ASYNC_MOVABLE,
+                .sync = false,
         };
 
         return __compact_pgdat(pgdat, &cc);
@@ -929,7 +833,7 @@ static int compact_node(int nid)
 {
         struct compact_control cc = {
                 .order = -1,
-                .mode = COMPACT_SYNC,
+                .sync = true,
         };
 
         return __compact_pgdat(NODE_DATA(nid), &cc);