From: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
In preparation for implementing lockless slab shrink,
we need to dynamically allocate the md-raid5 shrinker,
so that it can be freed asynchronously using kfree_rcu().
Then it doesn't need to wait for RCU read-side critical
section when releasing the struct r5conf.
Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
---
drivers/md/raid5.c | 28 +++++++++++++++++-----------
drivers/md/raid5.h | 2 +-
2 files changed, 18 insertions(+), 12 deletions(-)
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index f4eea1bbbeaf..4866cad1ad62 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -7391,7 +7391,7 @@ static void free_conf(struct r5conf *conf)
log_exit(conf);
- unregister_shrinker(&conf->shrinker);
+ unregister_and_free_shrinker(conf->shrinker);
free_thread_groups(conf);
shrink_stripes(conf);
raid5_free_percpu(conf);
@@ -7439,7 +7439,7 @@ static int raid5_alloc_percpu(struct r5conf *conf)
static unsigned long raid5_cache_scan(struct shrinker *shrink,
struct shrink_control *sc)
{
- struct r5conf *conf = container_of(shrink, struct r5conf, shrinker);
+ struct r5conf *conf = shrink->private_data;
unsigned long ret = SHRINK_STOP;
if (mutex_trylock(&conf->cache_size_mutex)) {
@@ -7460,7 +7460,7 @@ static unsigned long raid5_cache_scan(struct shrinker *shrink,
static unsigned long raid5_cache_count(struct shrinker *shrink,
struct shrink_control *sc)
{
- struct r5conf *conf = container_of(shrink, struct r5conf, shrinker);
+ struct r5conf *conf = shrink->private_data;
if (conf->max_nr_stripes < conf->min_nr_stripes)
/* unlikely, but not impossible */
@@ -7695,16 +7695,21 @@ static struct r5conf *setup_conf(struct mddev *mddev)
* it reduces the queue depth and so can hurt throughput.
* So set it rather large, scaled by number of devices.
*/
- conf->shrinker.seeks = DEFAULT_SEEKS * conf->raid_disks * 4;
- conf->shrinker.scan_objects = raid5_cache_scan;
- conf->shrinker.count_objects = raid5_cache_count;
- conf->shrinker.batch = 128;
- conf->shrinker.flags = 0;
- ret = register_shrinker(&conf->shrinker, "md-raid5:%s", mdname(mddev));
+ conf->shrinker = shrinker_alloc_and_init(raid5_cache_count,
+ raid5_cache_scan, 128,
+ DEFAULT_SEEKS * conf->raid_disks * 4,
+ 0, conf);
+ if (!conf->shrinker) {
+ pr_warn("md/raid:%s: couldn't allocate shrinker.\n",
+ mdname(mddev));
+ goto abort;
+ }
+
+ ret = register_shrinker(conf->shrinker, "md-raid5:%s", mdname(mddev));
if (ret) {
pr_warn("md/raid:%s: couldn't register shrinker.\n",
mdname(mddev));
- goto abort;
+ goto abort_shrinker;
}
sprintf(pers_name, "raid%d", mddev->new_level);
@@ -7717,7 +7722,8 @@ static struct r5conf *setup_conf(struct mddev *mddev)
}
return conf;
-
+abort_shrinker:
+ shrinker_free(conf->shrinker);
abort:
if (conf)
free_conf(conf);
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index 6a92fafb0748..806f84681599 100644
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -670,7 +670,7 @@ struct r5conf {
wait_queue_head_t wait_for_stripe;
wait_queue_head_t wait_for_overlap;
unsigned long cache_state;
- struct shrinker shrinker;
+ struct shrinker *shrinker;
int pool_size; /* number of disks in stripeheads in pool */
spinlock_t device_lock;
struct disk_info *disks;
--
2.30.2
