diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h
index d70b53e65f4323cdb51dc41c18b890f2ae7e6f25..e0b8b9173e1c1a5fe5a40a0f52aeb4b0ea593771 100644
--- a/include/trace/events/vmscan.h
+++ b/include/trace/events/vmscan.h
@@ -192,12 +192,12 @@ DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_memcg_softlimit_re
TRACE_EVENT(mm_shrink_slab_start,
TP_PROTO(struct shrinker *shr, struct shrink_control *sc,
- long nr_objects_to_shrink, unsigned long pgs_scanned,
- unsigned long lru_pgs, unsigned long cache_items,
- unsigned long long delta, unsigned long total_scan),
+ long nr_objects_to_shrink, unsigned long cache_items,
+ unsigned long long delta, unsigned long total_scan,
+ int priority),
- TP_ARGS(shr, sc, nr_objects_to_shrink, pgs_scanned, lru_pgs,
- cache_items, delta, total_scan),
+ TP_ARGS(shr, sc, nr_objects_to_shrink, cache_items, delta, total_scan,
+ priority),
TP_STRUCT__entry(
__field(struct shrinker *, shr)
@@ -205,11 +205,10 @@ TRACE_EVENT(mm_shrink_slab_start,
__field(int, nid)
__field(long, nr_objects_to_shrink)
__field(gfp_t, gfp_flags)
- __field(unsigned long, pgs_scanned)
- __field(unsigned long, lru_pgs)
__field(unsigned long, cache_items)
__field(unsigned long long, delta)
__field(unsigned long, total_scan)
+ __field(int, priority)
),
TP_fast_assign(
@@ -218,24 +217,22 @@ TRACE_EVENT(mm_shrink_slab_start,
__entry->nid = sc->nid;
__entry->nr_objects_to_shrink = nr_objects_to_shrink;
__entry->gfp_flags = sc->gfp_mask;
- __entry->pgs_scanned = pgs_scanned;
- __entry->lru_pgs = lru_pgs;
__entry->cache_items = cache_items;
__entry->delta = delta;
__entry->total_scan = total_scan;
+ __entry->priority = priority;
),
- TP_printk("%pF %p: nid: %d objects to shrink %ld gfp_flags %s pgs_scanned %ld lru_pgs %ld cache items %ld delta %lld total_scan %ld",
+ TP_printk("%pF %p: nid: %d objects to shrink %ld gfp_flags %s cache items %ld delta %lld total_scan %ld priority %d",
__entry->shrink,
__entry->shr,
__entry->nid,
__entry->nr_objects_to_shrink,
show_gfp_flags(__entry->gfp_flags),
- __entry->pgs_scanned,
- __entry->lru_pgs,
__entry->cache_items,
__entry->delta,
- __entry->total_scan)
+ __entry->total_scan,
+ __entry->priority)
);
TRACE_EVENT(mm_shrink_slab_end,
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 47d5ced51f2d44cddc559814b42caa0ea9bf5863..e73274a60b226ffb15344bcbfa3ed1ea9e6db847 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -310,9 +310,7 @@ EXPORT_SYMBOL(unregister_shrinker);
#define SHRINK_BATCH 128
static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
- struct shrinker *shrinker,
- unsigned long nr_scanned,
- unsigned long nr_eligible)
+ struct shrinker *shrinker, int priority)
{
unsigned long freed = 0;
unsigned long long delta;
@@ -337,9 +335,9 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
nr = atomic_long_xchg(&shrinker->nr_deferred[nid], 0);
total_scan = nr;
- delta = (4 * nr_scanned) / shrinker->seeks;
- delta *= freeable;
- do_div(delta, nr_eligible + 1);
+ delta = freeable >> priority;
+ delta *= 4;
+ do_div(delta, shrinker->seeks);
total_scan += delta;
if (total_scan < 0) {
pr_err("shrink_slab: %pF negative objects to delete nr=%ld\n",
@@ -373,8 +371,7 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
total_scan = freeable * 2;
trace_mm_shrink_slab_start(shrinker, shrinkctl, nr,
- nr_scanned, nr_eligible,
- freeable, delta, total_scan);
+ freeable, delta, total_scan, priority);
/*
* Normally, we should not scan less than batch_size objects in one
@@ -434,8 +431,7 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
* @gfp_mask: allocation context
* @nid: node whose slab caches to target
* @memcg: memory cgroup whose slab caches to target
- * @nr_scanned: pressure numerator
- * @nr_eligible: pressure denominator
+ * @priority: the reclaim priority
*
* Call the shrink functions to age shrinkable caches.
*
@@ -447,20 +443,14 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
* objects from the memory cgroup specified. Otherwise, only unaware
* shrinkers are called.
*
- * @nr_scanned and @nr_eligible form a ratio that indicate how much of
- * the available objects should be scanned. Page reclaim for example
- * passes the number of pages scanned and the number of pages on the
- * LRU lists that it considered on @nid, plus a bias in @nr_scanned
- * when it encountered mapped pages. The ratio is further biased by
- * the ->seeks setting of the shrink function, which indicates the
- * cost to recreate an object relative to that of an LRU page.
+ * @priority is sc->priority, we take the number of objects and >> by priority
+ * in order to get the scan target.
*
* Returns the number of reclaimed slab objects.
*/
static unsigned long shrink_slab(gfp_t gfp_mask, int nid,
struct mem_cgroup *memcg,
- unsigned long nr_scanned,
- unsigned long nr_eligible)
+ int priority)
{
struct shrinker *shrinker;
unsigned long freed = 0;
@@ -468,9 +458,6 @@ static unsigned long shrink_slab(gfp_t gfp_mask, int nid,
if (memcg && (!memcg_kmem_enabled() || !mem_cgroup_online(memcg)))
return 0;
- if (nr_scanned == 0)
- nr_scanned = SWAP_CLUSTER_MAX;
-
if (!down_read_trylock(&shrinker_rwsem)) {
/*
* If we would return 0, our callers would understand that we
@@ -501,7 +488,7 @@ static unsigned long shrink_slab(gfp_t gfp_mask, int nid,
if (!(shrinker->flags & SHRINKER_NUMA_AWARE))
sc.nid = 0;
- freed += do_shrink_slab(&sc, shrinker, nr_scanned, nr_eligible);
+ freed += do_shrink_slab(&sc, shrinker, priority);
}
up_read(&shrinker_rwsem);
@@ -519,8 +506,7 @@ void drop_slab_node(int nid)
freed = 0;
do {
- freed += shrink_slab(GFP_KERNEL, nid, memcg,
- 1000, 1000);
+ freed += shrink_slab(GFP_KERNEL, nid, memcg, 0);
} while ((memcg = mem_cgroup_iter(NULL, memcg, NULL)) != NULL);
} while (freed > 10);
}
@@ -2615,14 +2601,12 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc)
reclaimed = sc->nr_reclaimed;
scanned = sc->nr_scanned;
-
shrink_node_memcg(pgdat, memcg, sc, &lru_pages);
node_lru_pages += lru_pages;
if (memcg)
shrink_slab(sc->gfp_mask, pgdat->node_id,
- memcg, sc->nr_scanned - scanned,
- lru_pages);
+ memcg, sc->priority);
/* Record the group's reclaim efficiency */
vmpressure(sc->gfp_mask, memcg, false,
@@ -2646,14 +2630,9 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc)
}
} while ((memcg = mem_cgroup_iter(root, memcg, &reclaim)));
- /*
- * Shrink the slab caches in the same proportion that
- * the eligible LRU pages were scanned.
- */
if (global_reclaim(sc))
shrink_slab(sc->gfp_mask, pgdat->node_id, NULL,
- sc->nr_scanned - nr_scanned,
- node_lru_pages);
+ sc->priority);
if (reclaim_state) {
sc->nr_reclaimed += reclaim_state->reclaimed_slab;