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mm: delete NR_PAGES_SCANNED and pgdat_reclaimable()

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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: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Jia He <hejianet@gmail.com>
Cc: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner
2017-05-03 14:52:10 -07:00
committed by Linus Torvalds
parent 688035f729
commit c822f6223d
5 changed files with 3 additions and 41 deletions
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11
mm/page_alloc.c
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@@ -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");
}