From nobody Fri Dec 19 17:18:19 2025 Received: from mail-wm1-f50.google.com (mail-wm1-f50.google.com [209.85.128.50]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B4B423446AF for ; Thu, 6 Nov 2025 14:20:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.50 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762438814; cv=none; b=rFdnfpHBaYWmgF9bTP707sgg4txtHFmjZWiJlaK8sc91s4Hvia4E8E74y0bnZaLvva57Iz4wlNYy0baS0C+bf5XKhhM73E7mZvYzgjq2HiK91KMwQWMkqBpuf+MbfbzvZePAlk2xB+5Odz+WR6osHsvbalGu3OGVhUO7MZrxHg8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762438814; c=relaxed/simple; bh=8NtqKplCTfthbw1sz5U+vy8cTC2ogSC3rGwhwWFmRQA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=lnvmuqkgZO8FhYDapBamGWSA0gX/pTfZpabU0CzLJNcyjwT5DOV80I4VMYxHN/xx2EWNPENVsBDPfLKZMqTpf0AEwbHJyQ5SyUxpGLfEdni/xooWehP6SArmkVTlrFmsM/cDANVMp2l1eOy6JL49jtN/5JokILuhTlwCNJe8hIc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=suse.com; spf=pass smtp.mailfrom=suse.com; dkim=pass (2048-bit key) header.d=suse.com header.i=@suse.com header.b=C8/g835m; arc=none smtp.client-ip=209.85.128.50 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=suse.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=suse.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=suse.com header.i=@suse.com header.b="C8/g835m" Received: by mail-wm1-f50.google.com with SMTP id 5b1f17b1804b1-4710683a644so7429345e9.0 for ; Thu, 06 Nov 2025 06:20:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1762438811; x=1763043611; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=2TBiyXlV6SP766DuHM6j5JQotvSVYeIR5ytAqVLqwpw=; b=C8/g835mP4RC0PgZ+b6KETu9P7Mh0hIfJ9QrF8oXJZ4t5uKJ4sZK3mtSreEblixSLu EIuaGa+QLQ7KK7AMs2hbb/o1koNQRvoIDxgMUEIcVZ8s4Z1w4UbBy3K0oV6MpNW06KcQ I7WV9MGJV6f7RlMihn41RtWReHgaOXQkkS3btHG6j8BnS/rpSNgIQYASLFZA3THOjznN 9qqIa3C5jbShbGB2tuy1NKeDTMHYKQ9zCQIz7paeHMWF+lsy9QV/ZyswXLxA18zAYlER CDsO+f60mp41NPg3oYP14nENf3hrCpcc5d1YReTf4cBeKyHLYwz3J81AjxxE9BZcittR iCwQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1762438811; x=1763043611; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=2TBiyXlV6SP766DuHM6j5JQotvSVYeIR5ytAqVLqwpw=; b=PYMfZnuHSFIaywob2UihT7X7xTDxhECvw2UovDNMrR14lBxD7+GETzq+s65t3PUI4g FikuNnqfRfiou4t/prDbb2atW1bowmp8Dai72uaOPY8wQX0Vo0wMQRmJpXF3YLtZXcNG oeoVTYEuesWRcVWk4Qfxl3KSk6EFL/7U+OOF01qytUKCnd86zAijOJk4BRME2fBQjn66 NIzp4r+fugz83JQNvi3VRXbOOPnE1SfEVBTBu9f3d/Kzgfpb625R61TWsXMRN1ekDKxs 7q0Dk4yH6df3SCG055YU4ELMT/aLlKoXF5RjNrtevMVRaCVvyOz/mWc2p6YxasvGNvsg lpSw== X-Gm-Message-State: AOJu0YyZkibyKTeB1fOxj7eebRX3FzrytmLFbzHk2eTqGejhPMX5dFFe X2V6+WCUhOGVvo60vfJpBoTYKsQBhmTdV8RGxD8aX229AZKy/Du/+1vCSAU7IRBhguDysZGftjs mZLaM X-Gm-Gg: ASbGncuxHyuOhmh6nMBVKLOchmL8PPH2lcUFOrJ8aidROXbmFptjg9qbkSeRdIXYsp5 TI5rSccCcHYONRkr/iD3n3C3uDyNrjEemiaVEXqVaILNti4QyZ6da8aQKymw7Uj6qukRtYwfTKL DUYrq/b1ZEvt4lu2DimMK/dMfgjZTCBZQbezxT0C8H8clwi2WWKIZxMoSXQiKisefHYXdVbrZS7 /8QO/nHWuy1kICK9zOCDrAoQoZfwsUwpJ78CRrY3IlBAC3T85+R9mxrT2lUQXRkOPt+GLak6+Nt ht51MGzYrk6VUh0/UjzRcovHg++rAIfVsx02FeRRIhATuw0ndzJRGIt9QQD5lxl7uddLY4GN3wS Fc4NlHhQ9KLSzuYTwrbneRMnYoEZg8IewGFFFe0YfrozldhCYP3zmTGIvYlQgF60dA7gyHI4Fc5 SFVGkYhv2+AdQbA4q6QdK0yhM= X-Google-Smtp-Source: AGHT+IEkUdUSnfE11zagsJf8KjzZv5gAOKwiUUPQtcQqvGlegNskiK6BvaOrq9+/jCOzm/1zxdPqiQ== X-Received: by 2002:a05:600c:4e86:b0:46e:2815:8568 with SMTP id 5b1f17b1804b1-47762049f4emr29994945e9.10.1762438810682; Thu, 06 Nov 2025 06:20:10 -0800 (PST) Received: from localhost.localdomain ([2a00:6d43:105:c401:e307:1a37:2e76:ce91]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-429eb49be96sm5255531f8f.35.2025.11.06.06.20.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 06 Nov 2025 06:20:10 -0800 (PST) From: Marco Crivellari To: linux-kernel@vger.kernel.org Cc: Tejun Heo , Lai Jiangshan , Frederic Weisbecker , Sebastian Andrzej Siewior , Marco Crivellari , Michal Hocko , Dmitry Torokhov Subject: [PATCH v2 4/4] Input: psmouse-smbus - add WQ_UNBOUND to alloc_workqueue user Date: Thu, 6 Nov 2025 15:19:55 +0100 Message-ID: <20251106141955.218911-5-marco.crivellari@suse.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251106141955.218911-1-marco.crivellari@suse.com> References: <20251106141955.218911-1-marco.crivellari@suse.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Currently if a user enqueue a work item using schedule_delayed_work() the used wq is "system_wq" (per-cpu wq) while queue_delayed_work() use WORK_CPU_UNBOUND (used when a cpu is not specified). The same applies to schedule_work() that is using system_wq and queue_work(), that makes use again of WORK_CPU_UNBOUND. This lack of consistentcy cannot be addressed without refactoring the API. alloc_workqueue() treats all queues as per-CPU by default, while unbound workqueues must opt-in via WQ_UNBOUND. This default is suboptimal: most workloads benefit from unbound queues, allowing the scheduler to place worker threads where they=E2=80=99re needed= and reducing noise when CPUs are isolated. This patch continues the effort to refactor worqueue APIs, which has begun with the change 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") This specific workload do not benefit from a per-cpu workqueue, so use WQ_UNBOUND on the custom workqueue instead. With the introduction of the WQ_PERCPU flag (equivalent to !WQ_UNBOUND), any alloc_workqueue() caller that doesn=E2=80=99t explicitly specify WQ_UNB= OUND must now use WQ_PERCPU. Once migration is complete, WQ_UNBOUND can be removed and unbound will become the implicit default. Suggested-by: Tejun Heo Signed-off-by: Marco Crivellari --- drivers/input/mouse/psmouse-smbus.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/input/mouse/psmouse-smbus.c b/drivers/input/mouse/psmo= use-smbus.c index 93420f07b7d0..15bd49ccad22 100644 --- a/drivers/input/mouse/psmouse-smbus.c +++ b/drivers/input/mouse/psmouse-smbus.c @@ -299,7 +299,7 @@ int __init psmouse_smbus_module_init(void) { int error; =20 - psmouse_smbus_wq =3D alloc_workqueue("psmouse-smbus", 0, 0); + psmouse_smbus_wq =3D alloc_workqueue("psmouse-smbus", WQ_UNBOUND, 0); if (!psmouse_smbus_wq) return -ENOMEM; =20 --=20 2.51.1