revert "mm: have order > 0 compaction start off where it left"

This reverts commit 7db8889ab05b ("mm: have order > 0 compaction start
off where it left") and commit de74f1cc ("mm: have order > 0 compaction
start near a pageblock with free pages").  These patches were a good
idea and tests confirmed that they massively reduced the amount of
scanning but the implementation is complex and tricky to understand.  A
later patch will cache what pageblocks should be skipped and
reimplements the concept of compact_cached_free_pfn on top for both
migration and free scanners.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Richard Davies <richard@arachsys.com>
Cc: Shaohua Li <shli@kernel.org>
Cc: Avi Kivity <avi@redhat.com>
Acked-by: Rafael Aquini <aquini@redhat.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 60 deletions

diff --git a/mm/compaction.c b/mm/compaction.c
index bdf6e13..db76361 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -538,20 +538,6 @@ next_pageblock:
 #endif /* CONFIG_COMPACTION || CONFIG_CMA */
 #ifdef CONFIG_COMPACTION
 /*
- * Returns the start pfn of the last page block in a zone.  This is the starting
- * point for full compaction of a zone.  Compaction searches for free pages from
- * the end of each zone, while isolate_freepages_block scans forward inside each
- * page block.
- */
-static unsigned long start_free_pfn(struct zone *zone)
-{
-	unsigned long free_pfn;
-	free_pfn = zone->zone_start_pfn + zone->spanned_pages;
-	free_pfn &= ~(pageblock_nr_pages-1);
-	return free_pfn;
-}
-
-/*
  * Based on information in the current compact_control, find blocks
  * suitable for isolating free pages from and then isolate them.
  */
@@ -619,19 +605,8 @@ static void isolate_freepages(struct zone *zone,
 		 * looking for free pages, the search will restart here as
 		 * page migration may have returned some pages to the allocator
 		 */
-		if (isolated) {
+		if (isolated)
 			high_pfn = max(high_pfn, pfn);
-
-			/*
-			 * If the free scanner has wrapped, update
-			 * compact_cached_free_pfn to point to the highest
-			 * pageblock with free pages. This reduces excessive
-			 * scanning of full pageblocks near the end of the
-			 * zone
-			 */
-			if (cc->order > 0 && cc->wrapped)
-				zone->compact_cached_free_pfn = high_pfn;
-		}
 	}
 
 	/* split_free_page does not map the pages */
@@ -639,11 +614,6 @@ static void isolate_freepages(struct zone *zone,
 
 	cc->free_pfn = high_pfn;
 	cc->nr_freepages = nr_freepages;
-
-	/* If compact_cached_free_pfn is reset then set it now */
-	if (cc->order > 0 && !cc->wrapped &&
-			zone->compact_cached_free_pfn == start_free_pfn(zone))
-		zone->compact_cached_free_pfn = high_pfn;
 }
 
 /*
@@ -738,26 +708,8 @@ static int compact_finished(struct zone *zone,
 	if (fatal_signal_pending(current))
 		return COMPACT_PARTIAL;
 
-	/*
-	 * A full (order == -1) compaction run starts at the beginning and
-	 * end of a zone; it completes when the migrate and free scanner meet.
-	 * A partial (order > 0) compaction can start with the free scanner
-	 * at a random point in the zone, and may have to restart.
-	 */
-	if (cc->free_pfn <= cc->migrate_pfn) {
-		if (cc->order > 0 && !cc->wrapped) {
-			/* We started partway through; restart at the end. */
-			unsigned long free_pfn = start_free_pfn(zone);
-			zone->compact_cached_free_pfn = free_pfn;
-			cc->free_pfn = free_pfn;
-			cc->wrapped = 1;
-			return COMPACT_CONTINUE;
-		}
-		return COMPACT_COMPLETE;
-	}
-
-	/* We wrapped around and ended up where we started. */
-	if (cc->wrapped && cc->free_pfn <= cc->start_free_pfn)
+	/* Compaction run completes if the migrate and free scanner meet */
+	if (cc->free_pfn <= cc->migrate_pfn)
 		return COMPACT_COMPLETE;
 
 	/*
@@ -863,15 +815,8 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
 
 	/* Setup to move all movable pages to the end of the zone */
 	cc->migrate_pfn = zone->zone_start_pfn;
-
-	if (cc->order > 0) {
-		/* Incremental compaction. Start where the last one stopped. */
-		cc->free_pfn = zone->compact_cached_free_pfn;
-		cc->start_free_pfn = cc->free_pfn;
-	} else {
-		/* Order == -1 starts at the end of the zone. */
-		cc->free_pfn = start_free_pfn(zone);
-	}
+	cc->free_pfn = cc->migrate_pfn + zone->spanned_pages;
+	cc->free_pfn &= ~(pageblock_nr_pages-1);
 
 	migrate_prep_local();