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mm, memcg: move memcg limit enforcement from zones to nodes

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Memcg needs adjustment after moving LRUs to the node.  Limits are
tracked per memcg but the soft-limit excess is tracked per zone.  As
global page reclaim is based on the node, it is easy to imagine a
situation where a zone soft limit is exceeded even though the memcg
limit is fine.

This patch moves the soft limit tree the node.  Technically, all the
variable names should also change but people are already familiar by the
meaning of "mz" even if "mn" would be a more appropriate name now.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Mel Gorman <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Cc: Hillf Danton <[email protected]>
Acked-by: Johannes Weiner <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mel Gorman 2016-07-28 15:46:05 -07:00 • committed by Linus Torvalds
commit ef8f232799
5 changed files with 111 additions and 144 deletions
Download patch file Download diff file Expand all files Collapse all files

19
mm/vmscan.c
View file

@ -2229,8 +2229,7 @@ static inline void init_tlb_ubc(void)
static void shrink_node_memcg(struct pglist_data *pgdat, struct mem_cgroup *memcg,
struct scan_control *sc, unsigned long *lru_pages)
{
struct zone *zone = &pgdat->node_zones[sc->reclaim_idx];
struct lruvec *lruvec = mem_cgroup_lruvec(pgdat, zone, memcg);
struct lruvec *lruvec = mem_cgroup_lruvec(pgdat, memcg);
unsigned long nr[NR_LRU_LISTS];
unsigned long targets[NR_LRU_LISTS];
unsigned long nr_to_scan;
@ -2439,7 +2438,7 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc,
do {
struct mem_cgroup *root = sc->target_mem_cgroup;
struct mem_cgroup_reclaim_cookie reclaim = {
.zone = &pgdat->node_zones[classzone_idx],
.pgdat = pgdat,
.priority = sc->priority,
};
unsigned long node_lru_pages = 0;
@ -2647,7 +2646,7 @@ static void shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
* and balancing, not for a memcg's limit.
*/
nr_soft_scanned = 0;
nr_soft_reclaimed = mem_cgroup_soft_limit_reclaim(zone,
nr_soft_reclaimed = mem_cgroup_soft_limit_reclaim(zone->zone_pgdat,
sc->order, sc->gfp_mask,
&nr_soft_scanned);
sc->nr_reclaimed += nr_soft_reclaimed;
@ -2917,7 +2916,7 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
unsigned long mem_cgroup_shrink_node(struct mem_cgroup *memcg,
gfp_t gfp_mask, bool noswap,
struct zone *zone,
pg_data_t *pgdat,
unsigned long *nr_scanned)
{
struct scan_control sc = {
@ -2944,7 +2943,7 @@ unsigned long mem_cgroup_shrink_node(struct mem_cgroup *memcg,
* will pick up pages from other mem cgroup's as well. We hack
* the priority and make it zero.
*/
shrink_node_memcg(zone->zone_pgdat, memcg, &sc, &lru_pages);
shrink_node_memcg(pgdat, memcg, &sc, &lru_pages);
trace_mm_vmscan_memcg_softlimit_reclaim_end(sc.nr_reclaimed);
@ -2994,7 +2993,7 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
#endif
static void age_active_anon(struct pglist_data *pgdat,
struct zone *zone, struct scan_control *sc)
struct scan_control *sc)
{
struct mem_cgroup *memcg;
@ -3003,7 +3002,7 @@ static void age_active_anon(struct pglist_data *pgdat,
memcg = mem_cgroup_iter(NULL, NULL, NULL);
do {
struct lruvec *lruvec = mem_cgroup_lruvec(pgdat, zone, memcg);
struct lruvec *lruvec = mem_cgroup_lruvec(pgdat, memcg);
if (inactive_list_is_low(lruvec, false))
shrink_active_list(SWAP_CLUSTER_MAX, lruvec,
@ -3193,7 +3192,7 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
* pages are rotated regardless of classzone as this is
* about consistent aging.
*/
age_active_anon(pgdat, &pgdat->node_zones[MAX_NR_ZONES - 1], &sc);
age_active_anon(pgdat, &sc);
/*
* If we're getting trouble reclaiming, start doing writepage
@ -3205,7 +3204,7 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
/* Call soft limit reclaim before calling shrink_node. */
sc.nr_scanned = 0;
nr_soft_scanned = 0;
nr_soft_reclaimed = mem_cgroup_soft_limit_reclaim(zone, sc.order,
nr_soft_reclaimed = mem_cgroup_soft_limit_reclaim(pgdat, sc.order,
sc.gfp_mask, &nr_soft_scanned);
sc.nr_reclaimed += nr_soft_reclaimed;