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Commit 5647bc29 authored by Mel Gorman's avatar Mel Gorman
Browse files

mm: compaction: Move migration fail/success stats to migrate.c 



The compact_pages_moved and compact_pagemigrate_failed events are
convenient for determining if compaction is active and to what
degree migration is succeeding but it's at the wrong level. Other
users of migration may also want to know if migration is working
properly and this will be particularly true for any automated
NUMA migration. This patch moves the counters down to migration
with the new events called pgmigrate_success and pgmigrate_fail.
The compact_blocks_moved counter is removed because while it was
useful for debugging initially, it's worthless now as no meaningful
conclusions can be drawn from its value.

Signed-off-by: default avatarMel Gorman <mgorman@suse.de>
Reviewed-by: default avatarRik van Riel <riel@redhat.com>
parent 1233d588

include/linux/vm_event_item.h

+3 −1
Original line number Diff line number Diff line
@@ -38,8 +38,10 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT, 
		KSWAPD_LOW_WMARK_HIT_QUICKLY, KSWAPD_HIGH_WMARK_HIT_QUICKLY,

		KSWAPD_SKIP_CONGESTION_WAIT,

		PAGEOUTRUN, ALLOCSTALL, PGROTATED,

#ifdef CONFIG_MIGRATION

		PGMIGRATE_SUCCESS, PGMIGRATE_FAIL,

#endif

#ifdef CONFIG_COMPACTION

		COMPACTBLOCKS, COMPACTPAGES, COMPACTPAGEFAILED,

		COMPACTSTALL, COMPACTFAIL, COMPACTSUCCESS,

#endif

#ifdef CONFIG_HUGETLB_PAGE

mm/compaction.c

+0 −4
Original line number Diff line number Diff line
@@ -994,10 +994,6 @@ static int compact_zone(struct zone *zone, struct compact_control *cc) 
		update_nr_listpages(cc);

		nr_remaining = cc->nr_migratepages;



		count_vm_event(COMPACTBLOCKS);

		count_vm_events(COMPACTPAGES, nr_migrate - nr_remaining);

		if (nr_remaining)

			count_vm_events(COMPACTPAGEFAILED, nr_remaining);

		trace_mm_compaction_migratepages(nr_migrate - nr_remaining,

						nr_remaining);

mm/migrate.c

+6 −0
Original line number Diff line number Diff line
@@ -962,6 +962,7 @@ int migrate_pages(struct list_head *from, 
{

	int retry = 1;

	int nr_failed = 0;

	int nr_succeeded = 0;

	int pass = 0;

	struct page *page;

	struct page *page2;
@@ -988,6 +989,7 @@ int migrate_pages(struct list_head *from, 
				retry++;

				break;

			case 0:

				nr_succeeded++;

				break;

			default:

				/* Permanent failure */
@@ -998,6 +1000,10 @@ int migrate_pages(struct list_head *from, 
	}

	rc = 0;

out:

	if (nr_succeeded)

		count_vm_events(PGMIGRATE_SUCCESS, nr_succeeded);

	if (nr_failed)

		count_vm_events(PGMIGRATE_FAIL, nr_failed);

	if (!swapwrite)

		current->flags &= ~PF_SWAPWRITE;

mm/vmstat.c

+4 −3
Original line number Diff line number Diff line
@@ -774,10 +774,11 @@ const char * const vmstat_text[] = { 


	"pgrotated",



#ifdef CONFIG_MIGRATION

	"pgmigrate_success",

	"pgmigrate_fail",

#endif

#ifdef CONFIG_COMPACTION

	"compact_blocks_moved",

	"compact_pages_moved",

	"compact_pagemigrate_failed",

	"compact_stall",

	"compact_fail",

	"compact_success",