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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 6CD57C55187 for ; Thu, 19 Mar 2020 00:11:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 38A14216FD for ; Thu, 19 Mar 2020 00:11:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584576688; bh=6byI644vY95Z8j8I2/LLCQleRYKanOWh2SiaJcHFMDY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=JIqpu5g1vWWfPAedETZadj87nwW8AR8eFll/ZhGP9AejLkf0fMkygbIMvP5hVmEki rtF3sZ18B6otmlu01oVpaEs9W2SA4s7Wrp5pAob2goWlQcDFIhBrZAPSObI5ceE/3b KuCfSAT4q/XI3Db0SPzYyPAGjRnRT7IGEplv2NFY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727566AbgCSAL1 (ORCPT ); Wed, 18 Mar 2020 20:11:27 -0400 Received: from mail.kernel.org ([198.145.29.99]:37102 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727467AbgCSALJ (ORCPT ); Wed, 18 Mar 2020 20:11:09 -0400 Received: from paulmck-ThinkPad-P72.home (50-39-105-78.bvtn.or.frontiernet.net [50.39.105.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id F0D78212CC; Thu, 19 Mar 2020 00:11:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584576669; bh=6byI644vY95Z8j8I2/LLCQleRYKanOWh2SiaJcHFMDY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uqYzOI7XWp7ElP4SCoGBWyaJ7GMGNnVnPv9pzQuaCArzV9YlGSmPR+6NYTuHV+YVJ /KhxWAEYRIFVt0LUpqyRGv6qkdEV2V8Apzo8rbQF98K6vG8vAwPhZ78pbVz1CUdZbR 5axC4dU5+FEy0wMazV8MCspgam789p5YwoYQWJis= From: paulmck@kernel.org To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com, mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org, "Paul E. McKenney" Subject: [PATCH RFC v2 tip/core/rcu 21/22] rcu-tasks: Add a grace-period start time for throttling and debug Date: Wed, 18 Mar 2020 17:10:59 -0700 Message-Id: <20200319001100.24917-21-paulmck@kernel.org> X-Mailer: git-send-email 2.9.5 In-Reply-To: <20200319001024.GA28798@paulmck-ThinkPad-P72> References: <20200319001024.GA28798@paulmck-ThinkPad-P72> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Paul E. McKenney" This commit adds a place to record the grace-period start in jiffies. This will be used by later commits for debugging purposes and to throttle IPIs early in the grace period. Signed-off-by: Paul E. McKenney --- kernel/rcu/tasks.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h index ca5fbde..6d237c4 100644 --- a/kernel/rcu/tasks.h +++ b/kernel/rcu/tasks.h @@ -46,6 +46,7 @@ struct rcu_tasks { raw_spinlock_t cbs_lock; int gp_state; unsigned long gp_jiffies; + unsigned long gp_start; struct task_struct *kthread_ptr; rcu_tasks_gp_func_t gp_func; pregp_func_t pregp_func; @@ -200,6 +201,7 @@ static int __noreturn rcu_tasks_kthread(void *arg) // Wait for one grace period. set_tasks_gp_state(rtp, RTGS_WAIT_GP); + rtp->gp_start = jiffies; rtp->gp_func(rtp); /* Invoke the callbacks. */ -- 2.9.5