Commit c822f622 authored by Johannes Weiner's avatar Johannes Weiner Committed by Linus Torvalds
Browse files

mm: delete NR_PAGES_SCANNED and pgdat_reclaimable() 

NR_PAGES_SCANNED counts number of pages scanned since the last page free
event in the allocator.  This was used primarily to measure the
reclaimability of zones and nodes, and determine when reclaim should
give up on them.  In that role, it has been replaced in the preceding
patches by a different mechanism.

Being implemented as an efficient vmstat counter, it was automatically
exported to userspace as well.  It's however unlikely that anyone
outside the kernel is using this counter in any meaningful way.

Remove the counter and the unused pgdat_reclaimable().

Link: http://lkml.kernel.org/r/20170228214007.5621-8-hannes@cmpxchg.org


Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Acked-by: default avatarHillf Danton <hillf.zj@alibaba-inc.com>
Acked-by: default avatarMichal Hocko <mhocko@suse.com>
Cc: Jia He <hejianet@gmail.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 688035f7

include/linux/mmzone.h

+0 −1
Original line number Diff line number Diff line
@@ -149,7 +149,6 @@ enum node_stat_item { 
	NR_UNEVICTABLE,		/*  "     "     "   "       "         */

	NR_ISOLATED_ANON,	/* Temporary isolated pages from anon lru */

	NR_ISOLATED_FILE,	/* Temporary isolated pages from file lru */

	NR_PAGES_SCANNED,	/* pages scanned since last reclaim */

	WORKINGSET_REFAULT,

	WORKINGSET_ACTIVATE,

	WORKINGSET_NODERECLAIM,

mm/internal.h

+0 −1
Original line number Diff line number Diff line
@@ -91,7 +91,6 @@ extern unsigned long highest_memmap_pfn; 
 */

extern int isolate_lru_page(struct page *page);

extern void putback_lru_page(struct page *page);

extern bool pgdat_reclaimable(struct pglist_data *pgdat);



/*

 * in mm/rmap.c:

mm/page_alloc.c

+0 −11
Original line number Diff line number Diff line
@@ -1090,14 +1090,10 @@ static void free_pcppages_bulk(struct zone *zone, int count, 
{

	int migratetype = 0;

	int batch_free = 0;

	unsigned long nr_scanned;

	bool isolated_pageblocks;



	spin_lock(&zone->lock);

	isolated_pageblocks = has_isolate_pageblock(zone);

	nr_scanned = node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED);

	if (nr_scanned)

		__mod_node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED, -nr_scanned);



	while (count) {

		struct page *page;
@@ -1150,12 +1146,7 @@ static void free_one_page(struct zone *zone, 
				unsigned int order,

				int migratetype)

{

	unsigned long nr_scanned;

	spin_lock(&zone->lock);

	nr_scanned = node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED);

	if (nr_scanned)

		__mod_node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED, -nr_scanned);



	if (unlikely(has_isolate_pageblock(zone) ||

		is_migrate_isolate(migratetype))) {

		migratetype = get_pfnblock_migratetype(page, pfn);
@@ -4504,7 +4495,6 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask) 
#endif

			" writeback_tmp:%lukB"

			" unstable:%lukB"

			" pages_scanned:%lu"

			" all_unreclaimable? %s"

			"\n",

			pgdat->node_id,
@@ -4527,7 +4517,6 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask) 
#endif

			K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),

			K(node_page_state(pgdat, NR_UNSTABLE_NFS)),

			node_page_state(pgdat, NR_PAGES_SCANNED),

			pgdat->kswapd_failures >= MAX_RECLAIM_RETRIES ?

				"yes" : "no");

	}

mm/vmscan.c

+0 −9
Original line number Diff line number Diff line
@@ -230,12 +230,6 @@ unsigned long pgdat_reclaimable_pages(struct pglist_data *pgdat) 
	return nr;

}



bool pgdat_reclaimable(struct pglist_data *pgdat)

{

	return node_page_state_snapshot(pgdat, NR_PAGES_SCANNED) <

		pgdat_reclaimable_pages(pgdat) * 6;

}



/**

 * lruvec_lru_size -  Returns the number of pages on the given LRU list.

 * @lruvec: lru vector
@@ -1750,7 +1744,6 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec, 
	reclaim_stat->recent_scanned[file] += nr_taken;



	if (global_reclaim(sc)) {

		__mod_node_page_state(pgdat, NR_PAGES_SCANNED, nr_scanned);

		if (current_is_kswapd())

			__count_vm_events(PGSCAN_KSWAPD, nr_scanned);

		else
@@ -1953,8 +1946,6 @@ static void shrink_active_list(unsigned long nr_to_scan, 
	__mod_node_page_state(pgdat, NR_ISOLATED_ANON + file, nr_taken);

	reclaim_stat->recent_scanned[file] += nr_taken;



	if (global_reclaim(sc))

		__mod_node_page_state(pgdat, NR_PAGES_SCANNED, nr_scanned);

	__count_vm_events(PGREFILL, nr_scanned);



	spin_unlock_irq(&pgdat->lru_lock);

mm/vmstat.c

+3 −19
Original line number Diff line number Diff line
@@ -954,7 +954,6 @@ const char * const vmstat_text[] = { 
	"nr_unevictable",

	"nr_isolated_anon",

	"nr_isolated_file",

	"nr_pages_scanned",

	"workingset_refault",

	"workingset_activate",

	"workingset_nodereclaim",
@@ -1378,7 +1377,6 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat, 
		   "\n        min      %lu"

		   "\n        low      %lu"

		   "\n        high     %lu"

		   "\n   node_scanned  %lu"

		   "\n        spanned  %lu"

		   "\n        present  %lu"

		   "\n        managed  %lu",
@@ -1386,7 +1384,6 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat, 
		   min_wmark_pages(zone),

		   low_wmark_pages(zone),

		   high_wmark_pages(zone),

		   node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED),

		   zone->spanned_pages,

		   zone->present_pages,

		   zone->managed_pages);
@@ -1586,22 +1583,9 @@ int vmstat_refresh(struct ctl_table *table, int write, 
	for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) {

		val = atomic_long_read(&vm_zone_stat[i]);

		if (val < 0) {

			switch (i) {

			case NR_PAGES_SCANNED:

				/*

				 * This is often seen to go negative in

				 * recent kernels, but not to go permanently

				 * negative.  Whilst it would be nicer not to

				 * have exceptions, rooting them out would be

				 * another task, of rather low priority.

				 */

				break;

			default:

			pr_warn("%s: %s %ld\n",

				__func__, vmstat_text[i], val);

			err = -EINVAL;

				break;

			}

		}

	}

	if (err)

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