From nobody Sat Feb 7 11:31:39 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 556F0C77B7A for ; Tue, 30 May 2023 14:57:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232921AbjE3O5v (ORCPT ); Tue, 30 May 2023 10:57:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34710 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232820AbjE3O5n (ORCPT ); Tue, 30 May 2023 10:57:43 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C4DBAB0 for ; Tue, 30 May 2023 07:56:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1685458617; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=zB34+gA9q6N2mJEfFmSt2POPWMX6epdGtnjhsa8vBnc=; b=iBCAgAnmzLl7pJbLrXIGp0tLeTly6KSI2RePd+9IiCIYcxesDLCKtzWPOwWleHe7Y+hjRX +uv2ng/UFTsZZHw/OXcaPa7iNRPFDovreXw9GbSHAr7Gxmtb0iWFS7vd7Q2OfiAEnYnr7p 9/TR1DCoYyKW+DhKlnRIDK4YlWCGcpw= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-471-M5R71YDnOC6zHMxN_4ZF3Q-1; Tue, 30 May 2023 10:56:51 -0400 X-MC-Unique: M5R71YDnOC6zHMxN_4ZF3Q-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 25935101AA68; Tue, 30 May 2023 14:56:51 +0000 (UTC) Received: from tpad.localdomain (ovpn-112-2.gru2.redhat.com [10.97.112.2]) by smtp.corp.redhat.com (Postfix) with ESMTPS id E9F62C154D3; Tue, 30 May 2023 14:56:50 +0000 (UTC) Received: by tpad.localdomain (Postfix, from userid 1000) id 57A59401E150C; Tue, 30 May 2023 11:56:33 -0300 (-03) Message-ID: <20230530145335.930262644@redhat.com> User-Agent: quilt/0.67 Date: Tue, 30 May 2023 11:52:37 -0300 From: Marcelo Tosatti To: Christoph Lameter Cc: Aaron Tomlin , Frederic Weisbecker , Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Vlastimil Babka , Michal Hocko , Marcelo Tosatti Subject: [PATCH 3/4] workqueue: add schedule_on_each_cpumask helper References: <20230530145234.968927611@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add a schedule_on_each_cpumask function, equivalent to schedule_on_each_cpu but accepting a cpumask to operate. Signed-off-by: Marcelo Tosatti --- Index: linux-vmstat-remote/kernel/workqueue.c =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D --- linux-vmstat-remote.orig/kernel/workqueue.c +++ linux-vmstat-remote/kernel/workqueue.c @@ -3455,6 +3455,56 @@ int schedule_on_each_cpu(work_func_t fun return 0; } =20 + +/** + * schedule_on_each_cpumask - execute a function synchronously on each + * CPU in "cpumask", for those which are online. + * + * @func: the function to call + * @mask: the CPUs which to call function on + * + * schedule_on_each_cpu() executes @func on each specified CPU that is onl= ine, + * using the system workqueue and blocks until all such CPUs have complete= d. + * schedule_on_each_cpu() is very slow. + * + * Return: + * 0 on success, -errno on failure. + */ +int schedule_on_each_cpumask(work_func_t func, cpumask_t *cpumask) +{ + int cpu; + struct work_struct __percpu *works; + cpumask_var_t effmask; + + works =3D alloc_percpu(struct work_struct); + if (!works) + return -ENOMEM; + + if (!alloc_cpumask_var(&effmask, GFP_KERNEL)) { + free_percpu(works); + return -ENOMEM; + } + + cpumask_and(effmask, cpumask, cpu_online_mask); + + cpus_read_lock(); + + for_each_cpu(cpu, effmask) { + struct work_struct *work =3D per_cpu_ptr(works, cpu); + + INIT_WORK(work, func); + schedule_work_on(cpu, work); + } + + for_each_cpu(cpu, effmask) + flush_work(per_cpu_ptr(works, cpu)); + + cpus_read_unlock(); + free_percpu(works); + free_cpumask_var(effmask); + return 0; +} + /** * execute_in_process_context - reliably execute the routine with user con= text * @fn: the function to execute Index: linux-vmstat-remote/include/linux/workqueue.h =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D --- linux-vmstat-remote.orig/include/linux/workqueue.h +++ linux-vmstat-remote/include/linux/workqueue.h @@ -450,6 +450,7 @@ extern void __flush_workqueue(struct wor extern void drain_workqueue(struct workqueue_struct *wq); =20 extern int schedule_on_each_cpu(work_func_t func); +extern int schedule_on_each_cpumask(work_func_t func, cpumask_t *cpumask); =20 int execute_in_process_context(work_func_t fn, struct execute_work *);