summaryrefslogtreecommitdiff
path: root/kernel/rcu
diff options
context:
space:
mode:
authorUladzislau Rezki (Sony) <urezki@gmail.com>2023-04-11 15:13:41 +0200
committerPaul E. McKenney <paulmck@kernel.org>2023-05-09 17:26:21 -0700
commit021a5ff8474379cd6c23e9b0e97aa27e5ff66a8b (patch)
tree827be40de2b730c4d5bffc6579865eb9b52184d8 /kernel/rcu
parent309a4316507767f8078d30c9681dc76f4299b0f1 (diff)
rcu/kvfree: Do not run a page work if a cache is disabled
By default the cache size is 5 pages per CPU, but it can be disabled at boot time by setting the rcu_min_cached_objs to zero. When that happens, the current code will uselessly set an hrtimer to schedule refilling this cache with zero pages. This commit therefore streamlines this process by simply refusing the set the hrtimer when rcu_min_cached_objs is zero. Signed-off-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.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 51d84eabf645..18f592bf6dc6 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3225,6 +3225,10 @@ static void fill_page_cache_func(struct work_struct *work)
static void
run_page_cache_worker(struct kfree_rcu_cpu *krcp)
{
+ // If cache disabled, bail out.
+ if (!rcu_min_cached_objs)
+ return;
+
if (rcu_scheduler_active == RCU_SCHEDULER_RUNNING &&
!atomic_xchg(&krcp->work_in_progress, 1)) {
if (atomic_read(&krcp->backoff_page_cache_fill)) {