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Wed, 21 Apr 2021 03:52:08 -0700 (PDT) Date: Wed, 21 Apr 2021 12:51:32 +0200 In-Reply-To: <20210421105132.3965998-1-elver@google.com> Message-Id: <20210421105132.3965998-4-elver@google.com> Mime-Version: 1.0 References: <20210421105132.3965998-1-elver@google.com> X-Mailer: git-send-email 2.31.1.368.gbe11c130af-goog Subject: [PATCH v2 3/3] kfence: use power-efficient work queue to run delayed work From: Marco Elver To: elver@google.com, akpm@linux-foundation.org Cc: glider@google.com, dvyukov@google.com, jannh@google.com, mark.rutland@arm.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, kasan-dev@googlegroups.com, hdanton@sina.com X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: DD9C2E000105 X-Stat-Signature: efgetmuomrq61zipowbijxxxrr17knmx Received-SPF: none (flex--elver.bounces.google.com>: No applicable sender policy available) receiver=imf30; identity=mailfrom; envelope-from="<32AOAYAUKCOkPWgPcRZZRWP.NZXWTYfi-XXVgLNV.ZcR@flex--elver.bounces.google.com>"; helo=mail-wr1-f73.google.com; client-ip=209.85.221.73 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1619002314-230399 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000217, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Use the power-efficient work queue, to avoid the pathological case where we keep pinning ourselves on the same possibly idle CPU on systems that want to be power-efficient [1]. [1] https://lwn.net/Articles/731052/ Signed-off-by: Marco Elver --- mm/kfence/core.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/mm/kfence/core.c b/mm/kfence/core.c index 9742649f3f88..e18fbbd5d9b4 100644 --- a/mm/kfence/core.c +++ b/mm/kfence/core.c @@ -636,7 +636,8 @@ static void toggle_allocation_gate(struct work_struct *work) /* Disable static key and reset timer. */ static_branch_disable(&kfence_allocation_key); #endif - schedule_delayed_work(&kfence_timer, msecs_to_jiffies(kfence_sample_interval)); + queue_delayed_work(system_power_efficient_wq, &kfence_timer, + msecs_to_jiffies(kfence_sample_interval)); } static DECLARE_DELAYED_WORK(kfence_timer, toggle_allocation_gate); @@ -665,7 +666,7 @@ void __init kfence_init(void) } WRITE_ONCE(kfence_enabled, true); - schedule_delayed_work(&kfence_timer, 0); + queue_delayed_work(system_power_efficient_wq, &kfence_timer, 0); pr_info("initialized - using %lu bytes for %d objects at 0x%p-0x%p\n", KFENCE_POOL_SIZE, CONFIG_KFENCE_NUM_OBJECTS, (void *)__kfence_pool, (void *)(__kfence_pool + KFENCE_POOL_SIZE));