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mm/page_alloc: cache the result of node_dirty_ok() 

To spread dirty pages, nodes are checked whether they have reached the
dirty limit using the expensive node_dirty_ok().  To reduce the frequency
of calling node_dirty_ok(), the last node that hit the dirty limit can be
cached.

Instead of caching the node, caching both the node and its node_dirty_ok()
status can reduce the number of calle to node_dirty_ok().

[akpm@linux-foundation.org: rename last_pgdat_dirty_limit to last_pgdat_dirty_ok]
Link: https://lkml.kernel.org/r/20220430011032.64071-1-vvghjk1234@gmail.com
Signed-off-by: Wonhyuk Yang <vvghjk1234@gmail.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: Donghyeok Kim <dthex5d@gmail.com>
Cc: JaeSang Yoo <jsyoo5b@gmail.com>
Cc: Jiyoup Kim <lakroforce@gmail.com>
Cc: Ohhoon Kwon <ohkwon1043@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Wonhyuk Yang 2022-05-12 20:22:51 -07:00 committed by Andrew Morton
parent 81a84182c3
commit 8a87d6959f
1 changed files with 8 additions and 7 deletions
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15
mm/page_alloc.c
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@ -4021,7 +4021,8 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags,
{ {
struct zoneref *z; struct zoneref *z;
struct zone *zone; struct zone *zone;
struct pglist_data *last_pgdat_dirty_limit = NULL; struct pglist_data *last_pgdat = NULL;
bool last_pgdat_dirty_ok = false;
bool no_fallback; bool no_fallback;
retry: retry:
@ -4060,13 +4061,13 @@ retry:
* dirty-throttling and the flusher threads. * dirty-throttling and the flusher threads.
*/ */
if (ac->spread_dirty_pages) { if (ac->spread_dirty_pages) {
if (last_pgdat_dirty_limit == zone->zone_pgdat) if (last_pgdat != zone->zone_pgdat) {
continue; last_pgdat = zone->zone_pgdat;
last_pgdat_dirty_ok = node_dirty_ok(zone->zone_pgdat);
if (!node_dirty_ok(zone->zone_pgdat)) {
last_pgdat_dirty_limit = zone->zone_pgdat;
continue;
} }
if (!last_pgdat_dirty_ok)
continue;
} }
if (no_fallback && nr_online_nodes > 1 && if (no_fallback && nr_online_nodes > 1 &&