From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 94214C35280 for ; Fri, 8 May 2020 03:31:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6D1352085B for ; Fri, 8 May 2020 03:31:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="D5MDteHk" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727789AbgEHDbT (ORCPT ); Thu, 7 May 2020 23:31:19 -0400 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:36994 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727777AbgEHDbT (ORCPT ); Thu, 7 May 2020 23:31:19 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1588908678; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=E8MHh9dyvpe8bslvZNsUP5j2B3v4NSqfl6A+NT0wxD4=; b=D5MDteHktG1i3bz2gYtC3qf1C6AEBEapWTzSbNOgJdqEUgEEbrCBVvqvVK5RhPi8tegJVs QR3+udP/fAQlysk2N8bOqI5bdQEvpiM5v0zaW2Gs9phgyDcqm5Wo5xAwM9YkQstBOc+UsC +AwUHc0POYmPdqVRFwBLf24HuvntIck= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-259-kwm_sW8LPE6l4dM0Y68Z0w-1; Thu, 07 May 2020 23:31:13 -0400 X-MC-Unique: kwm_sW8LPE6l4dM0Y68Z0w-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 6762D107ACCA; Fri, 8 May 2020 03:31:11 +0000 (UTC) Received: from localhost.localdomain.com (vpn2-54-199.bne.redhat.com [10.64.54.199]) by smtp.corp.redhat.com (Postfix) with ESMTP id 783242E052; Fri, 8 May 2020 03:31:03 +0000 (UTC) From: Gavin Shan To: kvmarm@lists.cs.columbia.edu Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, maz@kernel.org, mark.rutland@arm.com, will@kernel.org, catalin.marinas@arm.com, james.morse@arm.com, suzuki.poulose@arm.com, drjones@redhat.com, eric.auger@redhat.com, aarcange@redhat.com, shan.gavin@gmail.com Subject: [PATCH RFCv2 8/9] kernel/sched: Add cpu_rq_is_locked() Date: Fri, 8 May 2020 13:29:18 +1000 Message-Id: <20200508032919.52147-9-gshan@redhat.com> In-Reply-To: <20200508032919.52147-1-gshan@redhat.com> References: <20200508032919.52147-1-gshan@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This adds API cpu_rq_is_locked() to check if the CPU's runqueue has been locked or not. It's used in the subsequent patch to determine the task wakeup should be executed immediately or delayed. Signed-off-by: Gavin Shan --- include/linux/sched.h | 1 + kernel/sched/core.c | 8 ++++++++ 2 files changed, 9 insertions(+) diff --git a/include/linux/sched.h b/include/linux/sched.h index 4418f5cb8324..e68882443da7 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1691,6 +1691,7 @@ extern struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *n */ extern struct task_struct *find_get_task_by_vpid(pid_t nr); +extern bool cpu_rq_is_locked(int cpu); extern int wake_up_state(struct task_struct *tsk, unsigned int state); extern int wake_up_process(struct task_struct *tsk); extern void wake_up_new_task(struct task_struct *tsk); diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 9a2fbf98fd6f..30f4a8845495 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -73,6 +73,14 @@ __read_mostly int scheduler_running; */ int sysctl_sched_rt_runtime = 950000; +bool cpu_rq_is_locked(int cpu) +{ + struct rq *rq = cpu_rq(cpu); + + return raw_spin_is_locked(&rq->lock) ? true : false; +} +EXPORT_SYMBOL_GPL(cpu_rq_is_locked); + /* * __task_rq_lock - lock the rq @p resides on. */ -- 2.23.0