summaryrefslogtreecommitdiff
path: root/drivers/md/bcache/btree.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/md/bcache/btree.c')
-rw-r--r--drivers/md/bcache/btree.c43
1 files changed, 26 insertions, 17 deletions
diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c
index ee372884c405..f9764e61978b 100644
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -597,24 +597,19 @@ static int mca_reap(struct btree *b, struct closure *cl, unsigned min_order)
return 0;
}
-static int bch_mca_shrink(struct shrinker *shrink, struct shrink_control *sc)
+static unsigned long bch_mca_scan(struct shrinker *shrink,
+ struct shrink_control *sc)
{
struct cache_set *c = container_of(shrink, struct cache_set, shrink);
struct btree *b, *t;
unsigned long i, nr = sc->nr_to_scan;
+ unsigned long freed = 0;
if (c->shrinker_disabled)
- return 0;
+ return SHRINK_STOP;
if (c->try_harder)
- return 0;
-
- /*
- * If nr == 0, we're supposed to return the number of items we have
- * cached. Not allowed to return -1.
- */
- if (!nr)
- return mca_can_free(c) * c->btree_pages;
+ return SHRINK_STOP;
/* Return -1 if we can't do anything right now */
if (sc->gfp_mask & __GFP_WAIT)
@@ -634,14 +629,14 @@ static int bch_mca_shrink(struct shrinker *shrink, struct shrink_control *sc)
i = 0;
list_for_each_entry_safe(b, t, &c->btree_cache_freeable, list) {
- if (!nr)
+ if (freed >= nr)
break;
if (++i > 3 &&
!mca_reap(b, NULL, 0)) {
mca_data_free(b);
rw_unlock(true, b);
- --nr;
+ freed++;
}
}
@@ -652,7 +647,7 @@ static int bch_mca_shrink(struct shrinker *shrink, struct shrink_control *sc)
if (list_empty(&c->btree_cache))
goto out;
- for (i = 0; nr && i < c->bucket_cache_used; i++) {
+ for (i = 0; (nr--) && i < c->bucket_cache_used; i++) {
b = list_first_entry(&c->btree_cache, struct btree, list);
list_rotate_left(&c->btree_cache);
@@ -661,14 +656,27 @@ static int bch_mca_shrink(struct shrinker *shrink, struct shrink_control *sc)
mca_bucket_free(b);
mca_data_free(b);
rw_unlock(true, b);
- --nr;
+ freed++;
} else
b->accessed = 0;
}
out:
- nr = mca_can_free(c) * c->btree_pages;
mutex_unlock(&c->bucket_lock);
- return nr;
+ return freed;
+}
+
+static unsigned long bch_mca_count(struct shrinker *shrink,
+ struct shrink_control *sc)
+{
+ struct cache_set *c = container_of(shrink, struct cache_set, shrink);
+
+ if (c->shrinker_disabled)
+ return 0;
+
+ if (c->try_harder)
+ return 0;
+
+ return mca_can_free(c) * c->btree_pages;
}
void bch_btree_cache_free(struct cache_set *c)
@@ -737,7 +745,8 @@ int bch_btree_cache_alloc(struct cache_set *c)
c->verify_data = NULL;
#endif
- c->shrink.shrink = bch_mca_shrink;
+ c->shrink.count_objects = bch_mca_count;
+ c->shrink.scan_objects = bch_mca_scan;
c->shrink.seeks = 4;
c->shrink.batch = c->btree_pages * 2;
register_shrinker(&c->shrink);