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McKenney" Cc: RCU , quic_neeraju@quicinc.com, Boqun Feng , Joel Fernandes , LKML , Uladzislau Rezki , Oleksiy Avramchenko , Frederic Weisbecker Subject: [PATCH 1/1] rcu/kvfree: Do not run a page work if a cache is disabled Date: Tue, 11 Apr 2023 15:13:41 +0200 Message-Id: <20230411131341.9910-1-urezki@gmail.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-Spam-Status: No, score=-0.2 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1762887034974853331?= X-GMAIL-MSGID: =?utf-8?q?1762887034974853331?= 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. Signed-off-by: Uladzislau Rezki (Sony) --- kernel/rcu/tree.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 35be35f8236b..21e3d9dffde5 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -3246,6 +3246,10 @@ 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)) {