From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=158.69.130.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793907260; b=sry6fpQQezU+h0EdYSRYGjkOmyz7NHUS/C/Q6TOIXjkbJqY3QWqKzw6cQ83WNm3XuCVG SLyR4hDDKMAK8vYab9WZO/VWvnCD8T8ylU5UHHmAwdeoR+WL5OlE70NDGenH5Vjijg8XU pDIR0c3eJwxU1oIkEj3qTC6WJQLj257EnW0nKndzVZ9uWOJWZs8Cqh5QYX4EnRXuMj+UY h7h1Jvxf0Cp14DSGAKATp5+VUqkmYy3hPtRQKhu9DAoI1NYNKlvuPLDZmoNyx0nSpYssk nsos5LVUfSyKeph0uK1dFDWigJ699uoVr6Zcr7tPzKGAjC32nuRI5+0EPB9pZObNNPw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793907260; h=DMARC-Filter:DKIM-Signature:Received:From:To:Cc:Subject:Date: Message-Id:X-Mailer:In-Reply-To:References:MIME-Version: Content-Transfer-Encoding; bh=9xcKHMbn3SsYLrcgRVCN+uYKxdH8XYhCdsy+dXlYLgA=; b=rVfOFRxcMpwKg8KDRuJ224qM3RpiTpGe5+F4E4NBv+CZ4tMUJ06NZoohrySvstRGPTlK 6NOtDfv/yM8GKmG6Do0E5VstLD1uK8rYNcxShD2vHlmxnLDwdzbx9uWhJb2LZEguLbLzk 7dHQeqN4jANpUUhzAwiY4hZ1hMr1LEZFzjLXlhTTVxOE9QTvUY/ac78zK1CUwxWh/sp77 rwSH2houii2AcYNM30bc8Le25BJ70d1EzGGjTq7s9CegFUImCMH97ryR+JGFywwtro1Ae EF+FwntCSrDLjfUXmANJt4jlnJ/1w5KATI3mVD17YfCD0N1Sq87WKVg2O0uKOe1X3HQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=efficios.com; spf=pass smtp.mailfrom=efficios.com; dkim=pass header.d=efficios.com header.i=@efficios.com header.a=rsa-sha256 header.s=smtpout1 header.b=T3Y2FqCm; arc=none smtp.remote-ip=158.69.130.18 Received: from smtpout.efficios.com (smtpout.efficios.com [158.69.130.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AF58C60A2611; Thu, 5 Nov 2026 19:34:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org AF58C60A2611 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=efficios.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=efficios.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=efficios.com header.i=@efficios.com header.a=rsa-sha256 header.s=smtpout1 header.b=T3Y2FqCm DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=efficios.com; s=smtpout1; t=1793907252; bh=9xcKHMbn3SsYLrcgRVCN+uYKxdH8XYhCdsy+dXlYLgA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=T3Y2FqCmR8Ff1NGspV0s2QL4Ofq2YBYPDEBhyEuWSZzWYspvomB1y2OD/y0AX/RoJ aQ8pxHH1F4/0Yn/8i0Zu2eFtKoInygXHy2MewI8XnmqtevneJg/o5AjmEVaF1Rh86i kpXV+S6rVdHfHB9rXYtfzwjBtlG1HPejMXUm8+TRZWADazBb9UZ5nLEXZ8IV2By8J6 PMy3jD1RQl5xnwa9DzAcik9sCaLbpPdAUbTh7SPYP71xQQdQZ7OVk62Mq/gQvFYylt cUkzEO8hJvxOsbCL7pkT7sfEGwc/m8f01mVoHoLkoJnA8dpYM6SUI4UdKTrr3Gw8oq 875HSx7K4kruQ== Received: from thinkos.internal.efficios.com (mtl.efficios.com [216.120.195.104]) by smtpout.efficios.com (Postfix) with ESMTPSA id 4jLCDN2YBbzLkq; Thu, 05 Nov 2026 14:34:12 -0500 (EST) From: Mathieu Desnoyers To: juri.lelli@redhat.com, peterz@infradead.org, mingo@redhat.com, vincent.guittot@linaro.org Cc: linux-kernel@vger.kernel.org, Mathieu Desnoyers , dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, kprateek.nayak@amd.com, luca.abeni@santannapisa.it, mathieu.poirier@linaro.org, longman@redhat.com, ridong.chen@linux.dev, tj@kernel.org, hannes@cmpxchg.org, mkoutny@suse.com, shuah@kernel.org, bigeasy@linutronix.de, clrkwllms@kernel.org, parri.andrea@gmail.com, m.szyprowski@samsung.com, kayracizmeci@gmail.com, weihengqiuu@gmail.com, cgroups@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-rt-devel@lists.linux.dev Subject: [PATCH v3 21/24] sched/debug: Show the deadline bandwidth of each runqueue Date: Thu, 5 Nov 2026 14:33:56 -0500 Message-Id: <20261105193359.1450487-22-mathieu.desnoyers@efficios.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20261105193359.1450487-1-mathieu.desnoyers@efficios.com> References: <20261105193359.1450487-1-mathieu.desnoyers@efficios.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit sched_debug prints the bandwidth each root domain has handed out (dl_bw->total_bw), and nothing of the two sums each runqueue keeps: this_bw, the bandwidth of every deadline task of that CPU, and running_bw, the part of it whose tasks are active. GRUB drains the runtime of a reclaiming task at the rate the two give, the bandwidth of its CPU that is reserved and active (grub_reclaim(): max_bw - (this_bw - running_bw) - extra_bw): the less of its CPU is active, the slower its runtime drains, and the longer it runs on. Both sums have invariants a test can check, which the kernel itself warns about when they break: neither may wrap, and running_bw never exceeds this_bw. Print them. Signed-off-by: Mathieu Desnoyers --- kernel/sched/debug.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index a4ae092e0a68..c8a2cf18fdd1 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -1171,6 +1171,8 @@ void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq) SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(dl_rq->x)) PU(dl_nr_running); + PU(running_bw); + PU(this_bw); dl_bw = &cpu_rq(cpu)->rd->dl_bw; SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->bw", dl_bw->bw); SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->total_bw", dl_bw->total_bw); -- 2.47.3