From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 66AD1314D35 for ; Fri, 17 Jul 2026 15:48:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784303324; cv=none; b=rYkV3Bfy1BHmRBZhryMLD09zRBqmmhy2OE3a2R5vuK34pUlvourhHNow4pa9dYQb3UjmQa+oY1a9ybJuJzwcnOV0e/XIvTWtyaD8zCM4im8YgDO1VT4ShznMcJ3RyQhGzYKdZQYylkO6RFUQn+ofC94VH7LJ/zofR4GnkGAPDhs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784303324; c=relaxed/simple; bh=5rKxQ1zpC6RNHSnEZCSocKyHSrRa62pnNI/y7I042Ao=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:content-type; b=D8dfBnRUBLecZgkatbPHiv0RZS16yl/UMZrGKlBCjqZhWnMA3/2GboZw6Zptav2uc1D/7CHRXiZTQKnFpHIx43817NjmtRRFsY8Kx/voWKpujFsf49O2fP8kHlP0sTgPfCfRDIuJRsykezhTZEJpz0cD7OvpokcLAGQh19lwkYc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=T69TKw/J; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="T69TKw/J" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1784303322; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=tgnjwSI/hPUOWvDV3KsGpmfEM2qzvu1QMDBHUn9SIJ0=; b=T69TKw/Jz6h8fbNcgSZtZiajrU8QRFMR8i26Sxo1I5/kttrZqYqZHncHGLMlnReAOHoirE shdiyS9HrtUuS4I/5Js4LKYjBYoX++PRHSDntq0EnlqH+FfW+rFQGtVrKYxo0H+mkE3wCh 3cKIwayTqzcdEJU8oTWW1ZXhpH9BsNg= Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-462-50J7uDgQNqmo3CPdKv6Jug-1; Fri, 17 Jul 2026 11:48:39 -0400 X-MC-Unique: 50J7uDgQNqmo3CPdKv6Jug-1 X-Mimecast-MFC-AGG-ID: 50J7uDgQNqmo3CPdKv6Jug_1784303317 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 8BBE9195D026; Fri, 17 Jul 2026 15:48:37 +0000 (UTC) Received: from gmonaco-thinkpadt14gen3.local (headnet03.pony-001.prod.iad2.dc.redhat.com [10.2.32.114]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 001EA30040BF; Fri, 17 Jul 2026 15:48:32 +0000 (UTC) From: Gabriele Monaco To: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Steven Rostedt , Gabriele Monaco , Shuah Khan , linux-kselftest@vger.kernel.org Cc: Nam Cao , Thomas Weissschuh , Tomas Glozar , John Kacur , Wen Yang Subject: [PATCH v4 17/17] selftests/verification: Add selftests for deadline and stall monitors Date: Fri, 17 Jul 2026 17:46:38 +0200 Message-ID: <20260717154638.220789-18-gmonaco@redhat.com> In-Reply-To: <20260717154638.220789-1-gmonaco@redhat.com> References: <20260717154638.220789-1-gmonaco@redhat.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 X-Mimecast-MFC-PROC-ID: Rph8zbpzx1LnHm5h2MXFAPLsM8Ab3j48AnpbSVcNAiA_1784303317 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true Add selftests to verify deadline monitors don't fail under expected conditions and the stall monitor report violations only when expected. Signed-off-by: Gabriele Monaco --- Notes: V4: * Restore original stall threshold after selftest .../verification/test.d/rv_deadline.tc | 21 ++++++++++++ .../selftests/verification/test.d/rv_stall.tc | 33 +++++++++++++++++++ 2 files changed, 54 insertions(+) create mode 100644 tools/testing/selftests/verification/test.d/rv_deadline.tc create mode 100644 tools/testing/selftests/verification/test.d/rv_stall.tc diff --git a/tools/testing/selftests/verification/test.d/rv_deadline.tc b/tools/testing/selftests/verification/test.d/rv_deadline.tc new file mode 100644 index 000000000000..b583096beda6 --- /dev/null +++ b/tools/testing/selftests/verification/test.d/rv_deadline.tc @@ -0,0 +1,21 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0-or-later +# description: Test deadline monitors trigger no reaction +# requires: available_reactors deadline:monitor printk:reactor stress-ng:program + +load() { # returns true if there was a reaction + local lines_before + lines_before=$(dmesg | wc -l) + stress-ng --cpu 2 --sched deadline --sched-period 100000000 --sched-deadline 100000000 --sched-runtime 20000000 -t 5 & + stress-ng --cpu 2 --sched rr --sched-prio 50 --cyclic 1 --cyclic-policy rr --cyclic-prio 50 -t 5 & + wait + dmesg | tail -n +$((lines_before + 1)) | grep -q "rv: monitor [a-z]\+ does not allow event" +} + +echo 1 > monitors/deadline/enable +echo printk > monitors/deadline/reactors + +! load || false + +echo nop > monitors/deadline/reactors +echo 0 > monitors/deadline/enable diff --git a/tools/testing/selftests/verification/test.d/rv_stall.tc b/tools/testing/selftests/verification/test.d/rv_stall.tc new file mode 100644 index 000000000000..515a10263ca1 --- /dev/null +++ b/tools/testing/selftests/verification/test.d/rv_stall.tc @@ -0,0 +1,33 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0-or-later +# description: Test stall monitor +# requires: available_reactors stall:monitor printk:reactor stress-ng:program + +THRESHOLD=/sys/module/stall/parameters/threshold_jiffies +ORIG_THRESHOLD=$(cat $THRESHOLD) +trap 'echo $ORIG_THRESHOLD > $THRESHOLD' EXIT + +load() { # returns true if there was a reaction + local lines_before cpu + cpu=$(($(nproc) - 1)) + lines_before=$(dmesg | wc -l) + stress-ng --cpu 1 --taskset "$cpu" --sched rr --sched-prio 1 -t 3 & + stress-ng --cpu 5 --taskset "$cpu" -t 3 & + wait + dmesg | tail -n +$((lines_before + 1)) | grep -q "rv: monitor stall does not allow event" +} + +echo 5000 > $THRESHOLD +echo 1 > monitors/stall/enable +echo printk > monitors/stall/reactors + +! load || false + +echo 0 > monitors/stall/enable +echo 70 > $THRESHOLD +echo 1 > monitors/stall/enable + +load + +echo nop > monitors/stall/reactors +echo 0 > monitors/stall/enable -- 2.55.0