From nobody Sat Oct 4 14:10:43 2025 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 E7FFDBA4A; Sat, 16 Aug 2025 00:08:39 +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=1755302920; cv=none; b=FAATJZDxp2jzyjey3gmQA5NTvfugUoAXu+olD5ABHgzpfZmaoPUWBKwSwyTBSot2cRHUwT1emQz4gUSmFz0MZv9UB1GC+vqJ2r+snm6RPkEQwmWPLvHfAxoV1vR9E9ZxOtyw1FvEczDPggsmvNxrOtg3zFcAS7ynXM2ulEDv7VA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755302920; c=relaxed/simple; bh=Mp9NGrJWUWVhDqtHZIZvK7J6EzBqIIE/DcFZ0dsLmlI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=MCwDY4pGC2q3QU+UDDlsUa+pQr+r7jBGItuNmdT6B7C4rNfdoIj4sXTX8ZPXmAdRz1ZCj0DgND22YgGqxzlBGaSjbu+QNsZovUEorbXDvCnlAjtxBrJoeUFo4K7p+9NC9pf5KQIrwr8cVqXfntDUlQOE4JNNKI9j7i48STdEzNw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Lq9/un6s; 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="Lq9/un6s" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BCD96C4CEEB; Sat, 16 Aug 2025 00:08:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755302919; bh=Mp9NGrJWUWVhDqtHZIZvK7J6EzBqIIE/DcFZ0dsLmlI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Lq9/un6si0KLvYYMrjst4wRt1pwPAp4waTuw87tw94afsTlJQyIfi8XTm+khcLVzx K633FvvXvYIpq9RR5/RXChgmvhS/1UuxE9urhaUgN4h5+BkKwzaShIPLl1pPI4MZe1 mzAYKDKht5CPYnnoE+A68yY5jor+7pAARp3lHvSg6XLIKMAmxvTAWbpn1+aNfHadS4 t5Js4z325mfJaWl9GPQlq/x2isUh2zPBJfm3iRNK+Om6YPFWbMC5MSGs12nE2KHQF1 siar6rycDGoRtFei/m4ZdWttUeCtaTUfhtcKimBmqyB5avPCH9rTyaQ1OYgoV/fdqS f3rhUZdziNl/w== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id 11835CE0B2D; Fri, 15 Aug 2025 17:08:39 -0700 (PDT) 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" Subject: [PATCH 1/7] rcutorture: Fix jitter.sh spin time Date: Fri, 15 Aug 2025 17:08:31 -0700 Message-Id: <20250816000837.2622858-1-paulmck@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <8758bcc6-901f-4828-b2fc-aa9f90e85451@paulmck-laptop> References: <8758bcc6-901f-4828-b2fc-aa9f90e85451@paulmck-laptop> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" An embarrassing syntax error in jitter.sh makes for fixed spin time. This commit therefore makes it be variable, as intended, albeit with very coarse-grained adjustment. Signed-off-by: Paul E. McKenney --- .../selftests/rcutorture/bin/jitter.sh | 27 ++++++++++++++++--- 1 file changed, 24 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/rcutorture/bin/jitter.sh b/tools/testi= ng/selftests/rcutorture/bin/jitter.sh index fd1ffaa5a1358e..3c1e5d3f88058c 100755 --- a/tools/testing/selftests/rcutorture/bin/jitter.sh +++ b/tools/testing/selftests/rcutorture/bin/jitter.sh @@ -39,6 +39,22 @@ do fi done =20 +# Uses global variables startsecs, startns, endsecs, endns, and limit. +# Exit code is success for time not yet elapsed and failure otherwise. +function timecheck { + local done=3D`awk -v limit=3D$limit \ + -v startsecs=3D$startsecs \ + -v startns=3D$startns \ + -v endsecs=3D$endsecs \ + -v endns=3D$endns < /dev/null ' + BEGIN { + delta =3D (endsecs - startsecs) * 1000 * 1000; + delta +=3D int((endns - startns) / 1000); + print delta >=3D limit; + }'` + return $done +} + while : do # Check for done. @@ -85,15 +101,20 @@ do n=3D$(($n+1)) sleep .$sleeptime =20 - # Spin a random duration + # Spin a random duration, but with rather coarse granularity. limit=3D`awk -v me=3D$me -v n=3D$n -v spinmax=3D$spinmax 'BEGIN { srand(n + me + systime()); printf("%06d", int(rand() * spinmax)); }' < /dev/null` n=3D$(($n+1)) - for i in {1..$limit} + startsecs=3D`date +%s` + startns=3D`date +%N` + endsecs=3D$startns + endns=3D$endns + while timecheck do - echo > /dev/null + endsecs=3D`date +%s` + endns=3D`date +%N` done done =20 --=20 2.40.1