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mm: vmscan: move call to shrink_slab() to shrink_zones() 

This reduces the indentation level of do_try_to_free_pages() and removes
extra loop over all eligible zones counting the number of on-LRU pages.

Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Reviewed-by: Glauber Costa <glommer@gmail.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vladimir Davydov 2014-04-03 14:47:20 -07:00 committed by Linus Torvalds
parent 99120b772b
commit 65ec02cb9a
1 changed files with 25 additions and 31 deletions
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56
mm/vmscan.c
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@ -2291,13 +2291,16 @@ static inline bool compaction_ready(struct zone *zone, struct scan_control *sc)
* the caller that it should consider retrying the allocation instead of
* further reclaim.
*/
static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc,
struct shrink_control *shrink)
{
struct zoneref *z;
struct zone *zone;
unsigned long nr_soft_reclaimed;
unsigned long nr_soft_scanned;
unsigned long lru_pages = 0;
bool aborted_reclaim = false;
struct reclaim_state *reclaim_state = current->reclaim_state;
/*
* If the number of buffer_heads in the machine exceeds the maximum
@ -2307,6 +2310,8 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
if (buffer_heads_over_limit)
sc->gfp_mask |= __GFP_HIGHMEM;
nodes_clear(shrink->nodes_to_scan);
for_each_zone_zonelist_nodemask(zone, z, zonelist,
gfp_zone(sc->gfp_mask), sc->nodemask) {
if (!populated_zone(zone))
@ -2318,6 +2323,10 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
if (global_reclaim(sc)) {
if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL))
continue;
lru_pages += zone_reclaimable_pages(zone);
node_set(zone_to_nid(zone), shrink->nodes_to_scan);
if (sc->priority != DEF_PRIORITY &&
!zone_reclaimable(zone))
continue; /* Let kswapd poll it */
@ -2354,6 +2363,20 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
shrink_zone(zone, sc);
}
/*
* Don't shrink slabs when reclaiming memory from over limit cgroups
* but do shrink slab at least once when aborting reclaim for
* compaction to avoid unevenly scanning file/anon LRU pages over slab
* pages.
*/
if (global_reclaim(sc)) {
shrink_slab(shrink, sc->nr_scanned, lru_pages);
if (reclaim_state) {
sc->nr_reclaimed += reclaim_state->reclaimed_slab;
reclaim_state->reclaimed_slab = 0;
}
}
return aborted_reclaim;
}
@ -2398,9 +2421,6 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
struct shrink_control *shrink)
{
unsigned long total_scanned = 0;
struct reclaim_state *reclaim_state = current->reclaim_state;
struct zoneref *z;
struct zone *zone;
unsigned long writeback_threshold;
bool aborted_reclaim;
@ -2413,34 +2433,8 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
vmpressure_prio(sc->gfp_mask, sc->target_mem_cgroup,
sc->priority);
sc->nr_scanned = 0;
aborted_reclaim = shrink_zones(zonelist, sc);
aborted_reclaim = shrink_zones(zonelist, sc, shrink);
/*
* Don't shrink slabs when reclaiming memory from over limit
* cgroups but do shrink slab at least once when aborting
* reclaim for compaction to avoid unevenly scanning file/anon
* LRU pages over slab pages.
*/
if (global_reclaim(sc)) {
unsigned long lru_pages = 0;
nodes_clear(shrink->nodes_to_scan);
for_each_zone_zonelist_nodemask(zone, z, zonelist,
gfp_zone(sc->gfp_mask), sc->nodemask) {
if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL))
continue;
lru_pages += zone_reclaimable_pages(zone);
node_set(zone_to_nid(zone),
shrink->nodes_to_scan);
}
shrink_slab(shrink, sc->nr_scanned, lru_pages);
if (reclaim_state) {
sc->nr_reclaimed += reclaim_state->reclaimed_slab;
reclaim_state->reclaimed_slab = 0;
}
}
total_scanned += sc->nr_scanned;
if (sc->nr_reclaimed >= sc->nr_to_reclaim)
goto out;