This function is getting long and unwieldy, split out the memcg bits.
The updated shrink_node() handles the generic (node) reclaim aspects:
- global vmpressure notifications
- writeback and congestion throttling
- reclaim/compaction management
- kswapd giving up on unreclaimable nodes
It then calls a new shrink_node_memcgs() which handles cgroup specifics:
- the cgroup tree traversal
- memory.low considerations
- per-cgroup slab shrinking callbacks
- per-cgroup vmpressure notifications
[hannes@cmpxchg.org: rename "root" to "target_memcg", per Roman]
Link: http://lkml.kernel.org/r/20191025143640.GA386981@cmpxchg.org
Link: http://lkml.kernel.org/r/20191022144803.302233-8-hannes@cmpxchg.org
Change-Id: Ibef223d4f49740dc2ab2e86f2b7c1e529a9643e2
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Roman Gushchin <guro@fb.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[backport of the commit
0f6a5cff43d3bcd6aa54c9af267737249d02aa21 from mainline]
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
(memcg && memcg_congested(pgdat, memcg));
}
(memcg && memcg_congested(pgdat, memcg));
}
-static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc)
+static void shrink_node_memcgs(pg_data_t *pgdat, struct scan_control *sc)
- struct reclaim_state *reclaim_state = current->reclaim_state;
- struct mem_cgroup *root = sc->target_mem_cgroup;
- unsigned long nr_reclaimed, nr_scanned;
- bool reclaimable = false;
+ struct mem_cgroup *target_memcg = sc->target_mem_cgroup;
struct mem_cgroup *memcg;
struct mem_cgroup *memcg;
-again:
- memset(&sc->nr, 0, sizeof(sc->nr));
- nr_reclaimed = sc->nr_reclaimed;
- nr_scanned = sc->nr_scanned;
-
- memcg = mem_cgroup_iter(root, NULL, NULL);
+ memcg = mem_cgroup_iter(target_memcg, NULL, NULL);
do {
struct lruvec *lruvec = mem_cgroup_lruvec(memcg, pgdat);
unsigned long reclaimed;
unsigned long scanned;
do {
struct lruvec *lruvec = mem_cgroup_lruvec(memcg, pgdat);
unsigned long reclaimed;
unsigned long scanned;
- switch (mem_cgroup_protected(root, memcg)) {
+ switch (mem_cgroup_protected(target_memcg, memcg)) {
case MEMCG_PROT_MIN:
/*
* Hard protection.
case MEMCG_PROT_MIN:
/*
* Hard protection.
sc->nr_scanned - scanned,
sc->nr_reclaimed - reclaimed);
sc->nr_scanned - scanned,
sc->nr_reclaimed - reclaimed);
- } while ((memcg = mem_cgroup_iter(root, memcg, NULL)));
+ } while ((memcg = mem_cgroup_iter(target_memcg, memcg, NULL)));
+}
+
+static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc)
+{
+ struct reclaim_state *reclaim_state = current->reclaim_state;
+ struct mem_cgroup *target_memcg = sc->target_mem_cgroup;
+ unsigned long nr_reclaimed, nr_scanned;
+ bool reclaimable = false;
+
+again:
+ memset(&sc->nr, 0, sizeof(sc->nr));
+
+ nr_reclaimed = sc->nr_reclaimed;
+ nr_scanned = sc->nr_scanned;
+
+ shrink_node_memcgs(pgdat, sc);
if (reclaim_state) {
sc->nr_reclaimed += reclaim_state->reclaimed_slab;
if (reclaim_state) {
sc->nr_reclaimed += reclaim_state->reclaimed_slab;
}
/* Record the subtree's reclaim efficiency */
}
/* Record the subtree's reclaim efficiency */
- vmpressure(sc->gfp_mask, sc->target_mem_cgroup, true,
+ vmpressure(sc->gfp_mask, target_memcg, true,
sc->nr_scanned - nr_scanned,
sc->nr_reclaimed - nr_reclaimed);
sc->nr_scanned - nr_scanned,
sc->nr_reclaimed - nr_reclaimed);
*/
if (cgroup_reclaim(sc) && writeback_throttling_sane(sc) &&
sc->nr.dirty && sc->nr.dirty == sc->nr.congested)
*/
if (cgroup_reclaim(sc) && writeback_throttling_sane(sc) &&
sc->nr.dirty && sc->nr.dirty == sc->nr.congested)
- set_memcg_congestion(pgdat, root, true);
+ set_memcg_congestion(pgdat, target_memcg, true);
/*
* Stall direct reclaim for IO completions if underlying BDIs
/*
* Stall direct reclaim for IO completions if underlying BDIs
* the LRU too quickly.
*/
if (!sc->hibernation_mode && !current_is_kswapd() &&
* the LRU too quickly.
*/
if (!sc->hibernation_mode && !current_is_kswapd() &&
- current_may_throttle() && pgdat_memcg_congested(pgdat, root))
+ current_may_throttle() &&
+ pgdat_memcg_congested(pgdat, target_memcg))
wait_iff_congested(BLK_RW_ASYNC, HZ/10);
if (should_continue_reclaim(pgdat, sc->nr_reclaimed - nr_reclaimed,
wait_iff_congested(BLK_RW_ASYNC, HZ/10);
if (should_continue_reclaim(pgdat, sc->nr_reclaimed - nr_reclaimed,