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[2620:137:e000::1:20]) by mx.google.com with ESMTP id hf17-20020a17090aff9100b00262e3c1c1efsi6521233pjb.79.2023.08.07.16.02.30; Mon, 07 Aug 2023 16:02:44 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231261AbjHGWM0 (ORCPT + 99 others); Mon, 7 Aug 2023 18:12:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47354 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231251AbjHGWMN (ORCPT ); Mon, 7 Aug 2023 18:12:13 -0400 X-Greylist: delayed 210 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Mon, 07 Aug 2023 15:11:10 PDT Received: from p3plsmtpa13-06.prod.phx3.secureserver.net (p3plsmtpa13-06.prod.phx3.secureserver.net [72.167.218.132]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 71A372116 for ; Mon, 7 Aug 2023 15:11:10 -0700 (PDT) Received: from localhost ([82.27.99.45]) by :SMTPAUTH: with ESMTPA id T8N3qcRyBSo81T8N4qaX53; Mon, 07 Aug 2023 15:06:39 -0700 X-CMAE-Analysis: v=2.4 cv=WazKKWtX c=1 sm=1 tr=0 ts=64d16aef a=YwMIiW7BGddQzL8MrqPWMg==:117 a=YwMIiW7BGddQzL8MrqPWMg==:17 a=j-LfP5YGAAAA:8 a=FPoep68dpx1dqRdUuF0A:9 a=pci6KG57UX3UzFLC8IW4:22 X-SECURESERVER-ACCT: atomlin@atomlin.com From: Aaron Tomlin To: tj@kernel.org Cc: atomlin@atomlin.com, jiangshanlai@gmail.com, linux-kernel@vger.kernel.org, peterz@infradead.org Subject: [PATCH] workqueue: Rename rescuer kworker Date: Mon, 7 Aug 2023 23:06:37 +0100 Message-Id: <20230807220637.3203739-1-atomlin@atomlin.com> X-Mailer: git-send-email 2.39.1 MIME-Version: 1.0 X-CMAE-Envelope: MS4xfFo1C2Z9MFQIaTePl+WZBSY4ik/ke84/WMSJuqTXrhMD0BDb4rJsX1iSVy1HfdPpEWL9ywDIIro1zi7IRVVcWBF7cAGQyY1R/0f/I28llA74/e9Hrvnq RClOc8bz9QWCAPC/Y/zC1bIO+mqEgxifew4NWMuxtTgsv2OH4K8pWKaLqUGHw30r/Q4/vidsyIt3X1KECzZGw46l7t4zh8OS/e7fQ6EZm3vejMsa9aND8ydr PfT3emNoUeTwNbtlwnixJWfN4vxwX8dvOW2N4FjHo6wgsBy7XG7tNEd8ne9OLQoMl17GnQgallEKZ1PWxJJ7Xg== X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1773613208502499568 X-GMAIL-MSGID: 1773613208502499568 Each CPU-specific and unbound kworker kthread conforms to a particular naming scheme. However, this does not extend to the rescuer kworker. At present, a rescuer kworker is simply named according to its workqueue's name. This can be cryptic. From the context of user-mode, it can be useful to identify a rescuer kworker since their CPU affinity cannot be modified and their initial CPU assignment can be safely ignored. By design a rescuer kworker can run anywhere and only processes work items in an emergency situation. This patch modifies a rescuer to follow the kworker naming scheme. The "r" and "-" is indicative of a rescuer and its workqueue's name respectively e.g. "kworker/r-ext4-rsv-conver". Signed-off-by: Aaron Tomlin --- kernel/workqueue.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 02a8f402eeb5..d9bb375b8d02 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -4599,7 +4599,7 @@ static int init_rescuer(struct workqueue_struct *wq) } rescuer->rescue_wq = wq; - rescuer->task = kthread_create(rescuer_thread, rescuer, "%s", wq->name); + rescuer->task = kthread_create(rescuer_thread, rescuer, "kworker/r-%s", wq->name); if (IS_ERR(rescuer->task)) { ret = PTR_ERR(rescuer->task); pr_err("workqueue: Failed to create a rescuer kthread for wq \"%s\": %pe",