From patchwork Mon Jun 20 22:53:50 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Paul E. McKenney" X-Patchwork-Id: 12888372 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 819C4C43334 for ; Mon, 20 Jun 2022 22:54:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344942AbiFTWye (ORCPT ); Mon, 20 Jun 2022 18:54:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59146 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344335AbiFTWyR (ORCPT ); Mon, 20 Jun 2022 18:54:17 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 00F5ABAA; Mon, 20 Jun 2022 15:54:14 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 91F4E6144F; Mon, 20 Jun 2022 22:54:14 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BB5FAC341D0; Mon, 20 Jun 2022 22:54:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1655765653; bh=8h+rBmnZeQ4AuieFAaeisntZStUikWKJL2ok2dCqfHM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NeNKLVkLE/9+YnYH+ErEDr5KaiSmKPtKXTYhuSlDX8SGMhPlFjcLRyb7BkdfMqDRx txvLt8UKPlCHWc1/piuLCZSP8A2s5xCJXIRI9v60XjGC0R/zRegld9RhHJl2uARQ1W HqqeN6OYrRsgSsTDI4Gd9CocpUR18h4g6KK5TZmX5iHIF5EBbPoCu8APiBOWJTvbkL 8J4e2JJRU4GWB4nVeCVFO8Zd0JKsaoYrdVUlPwUSCoLJrtp+CjCLIiuEFX1c30UB87 BAmYZmyyOphf6mCY1e/HoxA5W5QyPlcmmpf53ogIsSDtMVDaoX1gDWBR5D8mO4okAC lfzlVsLI7Z07w== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id 3D4C45C0DEB; Mon, 20 Jun 2022 15:54:13 -0700 (PDT) From: "Paul E. McKenney" To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com, rostedt@goodmis.org, "Paul E. McKenney" , Neeraj Upadhyay , Eric Dumazet , Alexei Starovoitov , Andrii Nakryiko , Martin KaFai Lau , KP Singh Subject: [PATCH rcu 11/32] rcu-tasks: Make rcu_note_context_switch() unconditionally call rcu_tasks_qs() Date: Mon, 20 Jun 2022 15:53:50 -0700 Message-Id: <20220620225411.3842519-11-paulmck@kernel.org> X-Mailer: git-send-email 2.31.1.189.g2e36527f23 In-Reply-To: <20220620225402.GA3842369@paulmck-ThinkPad-P17-Gen-1> References: <20220620225402.GA3842369@paulmck-ThinkPad-P17-Gen-1> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org This commit makes rcu_note_context_switch() unconditionally invoke the rcu_tasks_qs() function, as opposed to doing so only when RCU (as opposed to RCU Tasks Trace) urgently needs a grace period to end. Signed-off-by: Paul E. McKenney Cc: Neeraj Upadhyay Cc: Eric Dumazet Cc: Alexei Starovoitov Cc: Andrii Nakryiko Cc: Martin KaFai Lau Cc: KP Singh --- kernel/rcu/tree_plugin.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index c8ba0fe17267c..c966d680b789e 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -899,8 +899,8 @@ void rcu_note_context_switch(bool preempt) this_cpu_write(rcu_data.rcu_urgent_qs, false); if (unlikely(raw_cpu_read(rcu_data.rcu_need_heavy_qs))) rcu_momentary_dyntick_idle(); - rcu_tasks_qs(current, preempt); out: + rcu_tasks_qs(current, preempt); trace_rcu_utilization(TPS("End context switch")); } EXPORT_SYMBOL_GPL(rcu_note_context_switch);