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Tue, 13 Jan 2026 03:46:45 -0800 (PST) From: Marco Crivellari To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Tejun Heo , Lai Jiangshan , Frederic Weisbecker , Sebastian Andrzej Siewior , Marco Crivellari , Michal Hocko , Andrew Morton Subject: [PATCH v2 2/3] mm: Replace use of system_wq with system_percpu_wq Date: Tue, 13 Jan 2026 12:46:29 +0100 Message-ID: <20260113114630.152942-3-marco.crivellari@suse.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260113114630.152942-1-marco.crivellari@suse.com> References: <20260113114630.152942-1-marco.crivellari@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: E67BB20003 X-Stat-Signature: mkh7qmxr79z6y56z76jzqcg95tjt8tdw X-Rspam-User: X-HE-Tag: 1768304806-116242 X-HE-Meta: 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 tcoryogY JDFAyn5l1qKnRNzNqiO8xBtkGW9wi4wBUqeRrfclzYV1DQbkH3QDB3pMfmLNe9HTBcKfnT5rV73qLag82TdjUWt7Z2GOZ8Avr06dI+txdVZqxPgh7YS7+6aoNl3z0WEIsIS3fVCo0KxkFB9wTUYLDvzn+w/2WmMFpnc5QuH+7s6qGp+gir3kVMFEwXKwk3NL7Iu0wlY65YPztK6fHeeGENzCXfPR/whRJj7Sl1UugpkEYlVI4/wTiUmb/e0aUaLJpgFMekYVbEVU5VdmdQCX+Yf26LczvLAs4SJP1fe54/GZuGtwUFWDenacOILV0to/v6uE7ZEVKDC0jYYzIw/g2WUDm16oZQFEc2UnlCximIPV+fpKg+sNZCnsnC9VVRi7qhj+XiOV5rW67sPDmu28GFGSCuQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This patch continues the effort to refactor workqueue APIs, which has begun with the changes introducing new workqueues and a new alloc_workqueue flag: commit 128ea9f6ccfb ("workqueue: Add system_percpu_wq and system_dfl_wq") commit 930c2ea566af ("workqueue: Add new WQ_PERCPU flag") The point of the refactoring is to eventually alter the default behavior of workqueues to become unbound by default so that their workload placement is optimized by the scheduler. Before that to happen, workqueue users must be converted to the better named new workqueues with no intended behaviour changes: system_wq -> system_percpu_wq system_unbound_wq -> system_dfl_wq This way the old obsolete workqueues (system_wq, system_unbound_wq) can be removed in the future. Link: https://lore.kernel.org/all/20250221112003.1dSuoGyc@linutronix.de/ Suggested-by: Tejun Heo Signed-off-by: Marco Crivellari --- mm/backing-dev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 2f65b5416228..4c6f0b85a24e 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -971,7 +971,7 @@ static int __init cgwb_init(void) { /* * There can be many concurrent release work items overwhelming - * system_wq. Put them in a separate wq and limit concurrency. + * system_percpu_wq. Put them in a separate wq and limit concurrency. * There's no point in executing many of these in parallel. */ cgwb_release_wq = alloc_workqueue("cgwb_release", 0, 1); -- 2.52.0