diff options
| -rw-r--r-- | drivers/md/bcache/super.c | 17 |
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"); |