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Tue, 28 Apr 2026 08:58:48 +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 rb8+Fch28GkHVQAAD6G6ig (envelope-from ); Tue, 28 Apr 2026 08:58:48 +0000 Message-ID: <32a383db-6dde-4c4c-b6b0-9d728b20b949@suse.de> Date: Tue, 28 Apr 2026 10:58:47 +0200 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 1/2] drm/nouveau: replace use of system_unbound_wq with system_dfl_wq To: Marco Crivellari , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org Cc: Tejun Heo , Lai Jiangshan , Frederic Weisbecker , Sebastian Andrzej Siewior , Michal Hocko , Lyude Paul , Danilo Krummrich , Maarten Lankhorst , Maxime Ripard , David Airlie , Simona Vetter References: <20251031102020.95349-1-marco.crivellari@suse.com> <20251031102020.95349-2-marco.crivellari@suse.com> Content-Language: en-US From: Thomas Zimmermann Autocrypt: addr=tzimmermann@suse.de; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-4.30 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; RCPT_COUNT_TWELVE(0.00)[15]; URIBL_BLOCKED(0.00)[suse.com:url,suse.com:email,suse.de:mid,suse.de:email,imap1.dmz-prg2.suse.org:helo]; MIME_TRACE(0.00)[0:+]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; FREEMAIL_CC(0.00)[kernel.org,gmail.com,linutronix.de,suse.com,redhat.com,linux.intel.com,ffwll.ch]; RCVD_TLS_ALL(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; RCVD_VIA_SMTP_AUTH(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:url,suse.com:email,suse.de:mid,suse.de:email,imap1.dmz-prg2.suse.org:helo] X-Spam-Flag: NO X-Spam-Score: -4.30 X-Spam-Level: Am 31.10.25 um 11:20 schrieb Marco Crivellari: > 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 consistency cannot be addressed without refactoring the API. > > system_unbound_wq should be the default workqueue so as not to enforce > locality constraints for random work whenever it's not required. > > Adding system_dfl_wq to encourage its use when unbound work should be used. > > The old system_unbound_wq will be kept for a few release cycles. > > Suggested-by: Tejun Heo > Signed-off-by: Marco Crivellari Acked-by: Thomas Zimmermann > --- > drivers/gpu/drm/nouveau/dispnv50/disp.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c > index e97e39abf3a2..50b7aade5f0a 100644 > --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c > +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c > @@ -2474,7 +2474,7 @@ nv50_disp_atomic_commit(struct drm_device *dev, > pm_runtime_get_noresume(dev->dev); > > if (nonblock) > - queue_work(system_unbound_wq, &state->commit_work); > + queue_work(system_dfl_wq, &state->commit_work); > else > nv50_disp_atomic_commit_tail(state); > -- -- 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)