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-rw-r--r--drivers/md/bcache/super.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index a8ea4e2086a9..26e374fbf57c 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1880,6 +1880,23 @@ static int run_cache_set(struct cache_set *c)
if (bch_btree_check(c))
goto err;
+ /*
+ * bch_btree_check() may occupy too much system memory which
+ * has negative effects to user space application (e.g. data
+ * base) performance. Shrink the mca cache memory proactively
+ * here to avoid competing memory with user space workloads..
+ */
+ if (!c->shrinker_disabled) {
+ struct shrink_control sc;
+
+ sc.gfp_mask = GFP_KERNEL;
+ sc.nr_to_scan = c->btree_cache_used * c->btree_pages;
+ /* first run to clear b->accessed tag */
+ c->shrink.scan_objects(&c->shrink, &sc);
+ /* second run to reap non-accessed nodes */
+ c->shrink.scan_objects(&c->shrink, &sc);
+ }
+
bch_journal_mark(c, &journal);
bch_initial_gc_finish(c);
pr_debug("btree_check() done");