diff options
| author | Zqiang <qiang1.zhang@intel.com> | 2023-04-18 20:27:02 +0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2023-05-09 17:26:21 -0700 |
| commit | 6b706e5603c44ff0b6f43c2e26e0d590e1d265f8 (patch) | |
| tree | 41a0f568dd67dda72a570b1bcaca139635e80dba /kernel/rcu | |
| parent | 60888b77a06ea16665e4df980bb86b418253e268 (diff) | |
rcu/kvfree: Make drain_page_cache() take early return if cache is disabled
If the rcutree.rcu_min_cached_objs kernel boot parameter is set to zero,
then krcp->page_cache_work will never be triggered to fill page cache.
In addition, the put_cached_bnode() will not fill page cache. As a
result krcp->bkvcache will always be empty, so there is no need to acquire
krcp->lock to get page from krcp->bkvcache. This commit therefore makes
drain_page_cache() return immediately if the rcu_min_cached_objs is zero.
Signed-off-by: Zqiang <qiang1.zhang@intel.com>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 98f2e833e217..00ed45ddc6ca 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -2902,6 +2902,9 @@ drain_page_cache(struct kfree_rcu_cpu *krcp) struct llist_node *page_list, *pos, *n; int freed = 0; + if (!rcu_min_cached_objs) + return 0; + raw_spin_lock_irqsave(&krcp->lock, flags); page_list = llist_del_all(&krcp->bkvcache); WRITE_ONCE(krcp->nr_bkv_objs, 0); |