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rcu/kvfree: Make drain_page_cache() take early return if cache is disabled

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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>
This commit is contained in:
Zqiang
2023-04-18 20:27:02 +08:00
committed by Paul E. McKenney
parent 60888b77a0
commit 6b706e5603
1 changed files with 3 additions and 0 deletions
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3
kernel/rcu/tree.c
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@@ -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);