From patchwork Wed Oct 19 22:51:40 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: 13012465 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 99EB5C433FE for ; Wed, 19 Oct 2022 22:52:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231382AbiJSWwF (ORCPT ); Wed, 19 Oct 2022 18:52:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51206 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231128AbiJSWv5 (ORCPT ); Wed, 19 Oct 2022 18:51:57 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DF9BF18DAA7; Wed, 19 Oct 2022 15:51:53 -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 ams.source.kernel.org (Postfix) with ESMTPS id 673DCB82624; Wed, 19 Oct 2022 22:51:49 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 25E2BC4314D; Wed, 19 Oct 2022 22:51:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1666219907; bh=n20MIqYs0+kWqGRzQ0GMSKtx306RkdYYsYOWA4bkwmg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cYcIi9YT6YwtY8k9Whsejvj1ntn5NUuJrR1GY7zsIEczTN8qC7CK9urL79tCh+hFL gNaFECgsjyApupJdT/fvJgSf87WwgZ2vRtPR6DQBmn/8BqENMMpgKZ5bG/GoNARzmN jrDUxONIRlmVNlOhcF0gj/+Zsh/rBiOH6wqqs9h6fsJYc0i58UptoqDr/235lyyAbn vsI5g1q6HGqHFtXBAzGzTPcw2kPK5Jz0adC6fazXn+Y6PYYx9sT3VEGll3hv1W5zhn vSKi5A9mLPlGVy3ShgPJGj/JUK2gchfQjqx4QXGCc8Qd6uHlH/relI51B5XtA94THa 7aN0vGyPc8H4w== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id 87D815C0D2B; Wed, 19 Oct 2022 15:51:46 -0700 (PDT) From: "Paul E. McKenney" To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com, rostedt@goodmis.org, "Joel Fernandes (Google)" , "Paul E . McKenney" Subject: [PATCH rcu 10/14] rcu/rcuscale: Use call_rcu_flush() for async reader test Date: Wed, 19 Oct 2022 15:51:40 -0700 Message-Id: <20221019225144.2500095-10-paulmck@kernel.org> X-Mailer: git-send-email 2.31.1.189.g2e36527f23 In-Reply-To: <20221019225138.GA2499943@paulmck-ThinkPad-P17-Gen-1> References: <20221019225138.GA2499943@paulmck-ThinkPad-P17-Gen-1> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org From: "Joel Fernandes (Google)" rcuscale uses call_rcu() to queue async readers. With recent changes to save power, the test will have fewer async readers in flight. Use the call_rcu_flush() API instead to revert to the old behavior. Signed-off-by: Joel Fernandes (Google) Signed-off-by: Paul E. McKenney --- kernel/rcu/rcuscale.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/rcu/rcuscale.c b/kernel/rcu/rcuscale.c index bbdcac1804ec8..0385e9b123998 100644 --- a/kernel/rcu/rcuscale.c +++ b/kernel/rcu/rcuscale.c @@ -176,7 +176,7 @@ static struct rcu_scale_ops rcu_ops = { .get_gp_seq = rcu_get_gp_seq, .gp_diff = rcu_seq_diff, .exp_completed = rcu_exp_batches_completed, - .async = call_rcu, + .async = call_rcu_flush, .gp_barrier = rcu_barrier, .sync = synchronize_rcu, .exp_sync = synchronize_rcu_expedited,