Commit 35979ef3 authored by David Rientjes's avatar David Rientjes Committed by Linus Torvalds
Browse files

mm, compaction: add per-zone migration pfn cache for async compaction 



Each zone has a cached migration scanner pfn for memory compaction so that
subsequent calls to memory compaction can start where the previous call
left off.

Currently, the compaction migration scanner only updates the per-zone
cached pfn when pageblocks were not skipped for async compaction.  This
creates a dependency on calling sync compaction to avoid having subsequent
calls to async compaction from scanning an enormous amount of non-MOVABLE
pageblocks each time it is called.  On large machines, this could be
potentially very expensive.

This patch adds a per-zone cached migration scanner pfn only for async
compaction.  It is updated everytime a pageblock has been scanned in its
entirety and when no pages from it were successfully isolated.  The cached
migration scanner pfn for sync compaction is updated only when called for
sync compaction.

Signed-off-by: default avatarDavid Rientjes <rientjes@google.com>
Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
Reviewed-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent d53aea3d

include/linux/mmzone.h

+3 −2
Original line number Diff line number Diff line
@@ -360,9 +360,10 @@ struct zone { 
	/* Set to true when the PG_migrate_skip bits should be cleared */

	bool			compact_blockskip_flush;



	/* pfns where compaction scanners should start */

	/* pfn where compaction free scanner should start */

	unsigned long		compact_cached_free_pfn;

	unsigned long		compact_cached_migrate_pfn;

	/* pfn where async and sync compaction migration scanner should start */

	unsigned long		compact_cached_migrate_pfn[2];

#endif

#ifdef CONFIG_MEMORY_HOTPLUG

	/* see spanned/present_pages for more description */

mm/compaction.c

+40 −26
Original line number Diff line number Diff line
@@ -89,7 +89,8 @@ static void __reset_isolation_suitable(struct zone *zone) 
	unsigned long end_pfn = zone_end_pfn(zone);

	unsigned long pfn;



	zone->compact_cached_migrate_pfn = start_pfn;

	zone->compact_cached_migrate_pfn[0] = start_pfn;

	zone->compact_cached_migrate_pfn[1] = start_pfn;

	zone->compact_cached_free_pfn = end_pfn;

	zone->compact_blockskip_flush = false;
@@ -131,9 +132,10 @@ void reset_isolation_suitable(pg_data_t *pgdat) 
 */

static void update_pageblock_skip(struct compact_control *cc,

			struct page *page, unsigned long nr_isolated,

			bool migrate_scanner)

			bool set_unsuitable, bool migrate_scanner)

{

	struct zone *zone = cc->zone;

	unsigned long pfn;



	if (cc->ignore_skip_hint)

		return;
@@ -141,22 +143,33 @@ static void update_pageblock_skip(struct compact_control *cc, 
	if (!page)

		return;



	if (!nr_isolated) {

		unsigned long pfn = page_to_pfn(page);

	if (nr_isolated)

		return;



	/*

	 * Only skip pageblocks when all forms of compaction will be known to

	 * fail in the near future.

	 */

	if (set_unsuitable)

		set_pageblock_skip(page);



		/* Update where compaction should restart */

	pfn = page_to_pfn(page);



	/* Update where async and sync compaction should restart */

	if (migrate_scanner) {

			if (!cc->finished_update_migrate &&

			    pfn > zone->compact_cached_migrate_pfn)

				zone->compact_cached_migrate_pfn = pfn;

		if (cc->finished_update_migrate)

			return;

		if (pfn > zone->compact_cached_migrate_pfn[0])

			zone->compact_cached_migrate_pfn[0] = pfn;

		if (cc->sync && pfn > zone->compact_cached_migrate_pfn[1])

			zone->compact_cached_migrate_pfn[1] = pfn;

	} else {

			if (!cc->finished_update_free &&

			    pfn < zone->compact_cached_free_pfn)

		if (cc->finished_update_free)

			return;

		if (pfn < zone->compact_cached_free_pfn)

			zone->compact_cached_free_pfn = pfn;

	}

}

}

#else

static inline bool isolation_suitable(struct compact_control *cc,

					struct page *page)
@@ -166,7 +179,7 @@ static inline bool isolation_suitable(struct compact_control *cc, 


static void update_pageblock_skip(struct compact_control *cc,

			struct page *page, unsigned long nr_isolated,

			bool migrate_scanner)

			bool set_unsuitable, bool migrate_scanner)

{

}

#endif /* CONFIG_COMPACTION */
@@ -323,7 +336,8 @@ isolate_fail: 


	/* Update the pageblock-skip if the whole pageblock was scanned */

	if (blockpfn == end_pfn)

		update_pageblock_skip(cc, valid_page, total_isolated, false);

		update_pageblock_skip(cc, valid_page, total_isolated, true,

				      false);



	count_compact_events(COMPACTFREE_SCANNED, nr_scanned);

	if (total_isolated)
@@ -458,7 +472,7 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc, 
	unsigned long flags;

	bool locked = false;

	struct page *page = NULL, *valid_page = NULL;

	bool skipped_async_unsuitable = false;

	bool set_unsuitable = true;

	const isolate_mode_t mode = (!cc->sync ? ISOLATE_ASYNC_MIGRATE : 0) |

				    (unevictable ? ISOLATE_UNEVICTABLE : 0);
@@ -535,8 +549,7 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc, 
			 */

			mt = get_pageblock_migratetype(page);

			if (!cc->sync && !migrate_async_suitable(mt)) {

				cc->finished_update_migrate = true;

				skipped_async_unsuitable = true;

				set_unsuitable = false;

				goto next_pageblock;

			}

		}
@@ -640,11 +653,10 @@ next_pageblock: 
	/*

	 * Update the pageblock-skip information and cached scanner pfn,

	 * if the whole pageblock was scanned without isolating any page.

	 * This is not done when pageblock was skipped due to being unsuitable

	 * for async compaction, so that eventual sync compaction can try.

	 */

	if (low_pfn == end_pfn && !skipped_async_unsuitable)

		update_pageblock_skip(cc, valid_page, nr_isolated, true);

	if (low_pfn == end_pfn)

		update_pageblock_skip(cc, valid_page, nr_isolated,

				      set_unsuitable, true);



	trace_mm_compaction_isolate_migratepages(nr_scanned, nr_isolated);
@@ -868,7 +880,8 @@ static int compact_finished(struct zone *zone, 
	/* Compaction run completes if the migrate and free scanner meet */

	if (cc->free_pfn <= cc->migrate_pfn) {

		/* Let the next compaction start anew. */

		zone->compact_cached_migrate_pfn = zone->zone_start_pfn;

		zone->compact_cached_migrate_pfn[0] = zone->zone_start_pfn;

		zone->compact_cached_migrate_pfn[1] = zone->zone_start_pfn;

		zone->compact_cached_free_pfn = zone_end_pfn(zone);



		/*
@@ -993,7 +1006,7 @@ static int compact_zone(struct zone *zone, struct compact_control *cc) 
	 * information on where the scanners should start but check that it

	 * is initialised by ensuring the values are within zone boundaries.

	 */

	cc->migrate_pfn = zone->compact_cached_migrate_pfn;

	cc->migrate_pfn = zone->compact_cached_migrate_pfn[cc->sync];

	cc->free_pfn = zone->compact_cached_free_pfn;

	if (cc->free_pfn < start_pfn || cc->free_pfn > end_pfn) {

		cc->free_pfn = end_pfn & ~(pageblock_nr_pages-1);
@@ -1001,7 +1014,8 @@ static int compact_zone(struct zone *zone, struct compact_control *cc) 
	}

	if (cc->migrate_pfn < start_pfn || cc->migrate_pfn > end_pfn) {

		cc->migrate_pfn = start_pfn;

		zone->compact_cached_migrate_pfn = cc->migrate_pfn;

		zone->compact_cached_migrate_pfn[0] = cc->migrate_pfn;

		zone->compact_cached_migrate_pfn[1] = cc->migrate_pfn;

	}



	trace_mm_compaction_begin(start_pfn, cc->migrate_pfn, cc->free_pfn, end_pfn);

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