From patchwork Thu Dec 12 18:52:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Paul E. McKenney" X-Patchwork-Id: 13905862 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 774BA1DD0F2; Thu, 12 Dec 2024 18:52:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734029560; cv=none; b=ml/t4C1j79yu77YxaBJSXxVimyhHwG9xM19pbMHCTbLTp0GCdKLXMMdXOaHhVxKV6r4m2tzn17chAwArn1JoC2z2pzfhg8sR5ZBHxeHn0OF9FXJoGTw/z/F87tGhwCFWIvXeF64/qURTCUl6W8x/24s/m3NHSNkusUAtJ4qYe0o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734029560; c=relaxed/simple; bh=EgjJ/pkU6eyu/0DLDvBmQw0nCmw113WYEA9zJwKpP60=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=GBTTn/DarvxJGDSMfLWFH1lpP3e2FEC52g+utzmnsns9p0wsNxVb/mgf7eXE0WqnQsjLmDEUdhkIk+N9cNU5dkrIwj5YoUiZhc8YB8rdULg/zQg8KMHbr43zIAGIg6BcTH3xyE5ojXzJR0D4SLOq7z7t8LefJJGzD68XUiAN6bY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=W64mK47C; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="W64mK47C" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5035AC4CED3; Thu, 12 Dec 2024 18:52:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1734029560; bh=EgjJ/pkU6eyu/0DLDvBmQw0nCmw113WYEA9zJwKpP60=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=W64mK47C5k01mPj+DxVY8FNrTPC0ra/Dd91ebZw26VctU08WUqoghDKEOqSgGBg0a GMBvL4yYWHWD0rW5iSZE8QaPHPWkyZA94JeD2e4TmL1uuB0IowcZBJbchlM8OCmiuO 4jCRFWthwrwrcutIm1+spehVLqBNMV6nbB2owKP9cv0YevvfiB1PI3WweWif+oqUpa b2TSCI7FggMLmGYzEAws0+sOGJXay7lJgj7IMJZMzFG2Tx4N7tH12u5GeYqpnZVgzi hokB70vKie16qC9ADyDVLBbzJ68HOjRJqAyepOjeT3+RzWfoR4dB7eP54Q6g4hQsW0 ValB5irZwVsjg== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id 06B3BCE0F53; Thu, 12 Dec 2024 10:52:40 -0800 (PST) From: "Paul E. McKenney" To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com, rostedt@goodmis.org, "Paul E. McKenney" , Frederic Weisbecker Subject: [PATCH rcu 1/2] refscale: Add test for sched_clock() Date: Thu, 12 Dec 2024 10:52:37 -0800 Message-Id: <20241212185238.2207771-1-paulmck@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: rcu@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This commit adds a "sched-clock" test for the sched_clock() function. Signed-off-by: Paul E. McKenney Signed-off-by: Frederic Weisbecker --- kernel/rcu/refscale.c | 40 +++++++++++++++++++++++++++++++++++++--- 1 file changed, 37 insertions(+), 3 deletions(-) diff --git a/kernel/rcu/refscale.c b/kernel/rcu/refscale.c index aacfcc9838b37..1b47376acdc40 100644 --- a/kernel/rcu/refscale.c +++ b/kernel/rcu/refscale.c @@ -36,6 +36,7 @@ #include #include #include +#include #include "rcu.h" @@ -531,6 +532,39 @@ static const struct ref_scale_ops acqrel_ops = { static volatile u64 stopopts; +static void ref_sched_clock_section(const int nloops) +{ + u64 x = 0; + int i; + + preempt_disable(); + for (i = nloops; i >= 0; i--) + x += sched_clock(); + preempt_enable(); + stopopts = x; +} + +static void ref_sched_clock_delay_section(const int nloops, const int udl, const int ndl) +{ + u64 x = 0; + int i; + + preempt_disable(); + for (i = nloops; i >= 0; i--) { + x += sched_clock(); + un_delay(udl, ndl); + } + preempt_enable(); + stopopts = x; +} + +static const struct ref_scale_ops sched_clock_ops = { + .readsection = ref_sched_clock_section, + .delaysection = ref_sched_clock_delay_section, + .name = "sched-clock" +}; + + static void ref_clock_section(const int nloops) { u64 x = 0; @@ -1130,9 +1164,9 @@ ref_scale_init(void) int firsterr = 0; static const struct ref_scale_ops *scale_ops[] = { &rcu_ops, &srcu_ops, &srcu_lite_ops, RCU_TRACE_OPS RCU_TASKS_OPS - &refcnt_ops, &rwlock_ops, &rwsem_ops, &lock_ops, &lock_irq_ops, &acqrel_ops, - &clock_ops, &jiffies_ops, &typesafe_ref_ops, &typesafe_lock_ops, - &typesafe_seqlock_ops, + &refcnt_ops, &rwlock_ops, &rwsem_ops, &lock_ops, &lock_irq_ops, + &acqrel_ops, &sched_clock_ops, &clock_ops, &jiffies_ops, + &typesafe_ref_ops, &typesafe_lock_ops, &typesafe_seqlock_ops, }; if (!torture_init_begin(scale_type, verbose))