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bh=sSfIoM1FfwtT3XY1nnVCe+CQ8uNnL8D6Ll4T48dwYk0=; b=dlnijJLLhgbArjG36t+iIEMq493AFo3hhJfi3d8mFobgZ6R7dbejyIQA/L0OlK8IQt9Qqy L3idwAQEs44uRuAg== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 72DED3EA68; Thu, 5 Mar 2026 12:26:39 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id RaCuGn92qWnpbgAAD6G6ig (envelope-from ); Thu, 05 Mar 2026 12:26:39 +0000 Message-ID: <1a139246-fe5d-46ee-9d83-879e57105b2e@suse.de> Date: Thu, 5 Mar 2026 13:26:38 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] drm/bridge: anx7625: add WQ_PERCPU add to alloc_workqueue users To: Marco Crivellari , linux-kernel@vger.kernel.org, dm-devel@lists.linux.dev Cc: Tejun Heo , Lai Jiangshan , Frederic Weisbecker , Sebastian Andrzej Siewior , Michal Hocko , Andrzej Hajda , Neil Armstrong , Robert Foss , Maarten Lankhorst , Maxime Ripard , David Airlie , Simona Vetter References: <20251107114318.163015-1-marco.crivellari@suse.com> Content-Language: en-US From: Thomas Zimmermann Autocrypt: addr=tzimmermann@suse.de; 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MID_RHS_MATCH_FROM(0.00)[]; DKIM_TRACE(0.00)[suse.de:+]; RCVD_VIA_SMTP_AUTH(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:mid,suse.de:dkim,suse.de:email,imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns,suse.com:url,suse.com:email] X-Rspamd-Action: no action X-Spam-Flag: NO X-Spam-Score: -4.51 X-Spam-Level: X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Rspamd-Queue-Id: CFBEC5BCF3 Am 07.11.25 um 12:43 schrieb Marco Crivellari: > Currently if a user enqueues 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 consistency 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’re needed and > reducing noise when CPUs are isolated. > > This continues the effort to refactor workqueue APIs, which began with > the introduction of new workqueues and a new alloc_workqueue flag in: > > commit 128ea9f6ccfb ("workqueue: Add system_percpu_wq and system_dfl_wq") > commit 930c2ea566af ("workqueue: Add new WQ_PERCPU flag") > > This change adds a new WQ_PERCPU flag to explicitly request > alloc_workqueue() to be per-cpu when WQ_UNBOUND has not been specified. > > With the introduction of the WQ_PERCPU flag (equivalent to !WQ_UNBOUND), > any alloc_workqueue() caller that doesn’t explicitly specify WQ_UNBOUND > 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 Reviewed-by: Thomas Zimmermann > --- > drivers/gpu/drm/bridge/analogix/anx7625.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c > index 6f3fdcb6afdb..4bd34b9825a0 100644 > --- a/drivers/gpu/drm/bridge/analogix/anx7625.c > +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c > @@ -2668,7 +2668,8 @@ static int anx7625_i2c_probe(struct i2c_client *client) > if (platform->pdata.intp_irq) { > INIT_WORK(&platform->work, anx7625_work_func); > platform->workqueue = alloc_workqueue("anx7625_work", > - WQ_FREEZABLE | WQ_MEM_RECLAIM, 1); > + WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_PERCPU, > + 1); > if (!platform->workqueue) { > DRM_DEV_ERROR(dev, "fail to create work queue\n"); > ret = -ENOMEM; -- -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com GF: Jochen Jaser, Andrew McDonald, Werner Knoblich, (HRB 36809, AG Nürnberg)