From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from 013.lax.mailroute.net (013.lax.mailroute.net [199.89.1.16]) (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 606223D45CB; Tue, 12 May 2026 17:37:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=199.89.1.16 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778607472; cv=none; b=KI1kKPu66qOym1kySLuMmrB8Cmm7vs4tMY+SiUMz9aJmqf0jrR8BBLYyGDwg4O3qYVdKHdWFlm1jCjn1o2esIK81hazt1az638ngT1aYNsdu4K94pvpPhFHBHrd1F3/0Hk60cSB20XiedrQwTEHa0tleUg94NBR0aW5vTUCQYZ8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778607472; c=relaxed/simple; bh=SfLW2oIpUw03aTO5iZJdt8SAZdCGgrQt7e5x0azW2GY=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=H1nu9NZyg57pEYG79HnhZg4trIgI1zXHqTthEQ3I309d0vl3qL3hwyXwMZmoUxWmko9RAn6y1RpmKflemDqroJPU6yovlcJnlKvMB3AEueG2ZcGjJ1SD21lN+uF2JrqYrPQSZOFVCM7HhvmW9OTR1KOUraaSTholWuYI5odxQRU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=acm.org; spf=pass smtp.mailfrom=acm.org; dkim=pass (2048-bit key) header.d=acm.org header.i=@acm.org header.b=std5bWuR; arc=none smtp.client-ip=199.89.1.16 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=acm.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=acm.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=acm.org header.i=@acm.org header.b="std5bWuR" Received: from localhost (localhost [127.0.0.1]) by 013.lax.mailroute.net (Postfix) with ESMTP id 4gFP1j3RfkzlgqsJ; Tue, 12 May 2026 17:37:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=acm.org; h= content-transfer-encoding:content-type:content-type:in-reply-to :from:from:content-language:references:subject:subject :user-agent:mime-version:date:date:message-id:received:received; s=mr01; t=1778607459; x=1781199460; bh=NrqhSJnT4qTcj1WPsQDcAvv5 PX774py0G/DOjV2QwJo=; b=std5bWuRcsIzL6nLYUKvBxFQM0DNAk9KjXXwHz+s 5sgnzVwzagMjm0g4eulfHOdA2vhgz1NOxWQX8+Ah7gMSKcz3dEYMGiq4jFD18CEt HhrC03OADWb2SBRDvaxbfx0NWWpfPacbIhvOzj7NG1F412bY+oFR2Nqi8rp20bKD L7qML2T4exGGb60X9xN3kBoAj/FFlnCAxvPGb99RsTuJkBApm0L6A6w/QJpkLKp4 V6ywsIbdwV0wXgXn3m5fR/ehG4/tfCB9iK6+Vem8Ie8j6acIgEDxPJKh4G17RrVM tIXQZ87f8nyvX278Rw9gQAjSzOk/m4eOVWM5tW8HSe3D1A== X-Virus-Scanned: by MailRoute Received: from 013.lax.mailroute.net ([127.0.0.1]) by localhost (013.lax [127.0.0.1]) (mroute_mailscanner, port 10029) with LMTP id 7S3oCHixwdtk; Tue, 12 May 2026 17:37:39 +0000 (UTC) Received: from [100.119.48.131] (unknown [104.135.180.219]) (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) (Authenticated sender: bvanassche@acm.org) by 013.lax.mailroute.net (Postfix) with ESMTPSA id 4gFP1T5v68zlfwHM; Tue, 12 May 2026 17:37:33 +0000 (UTC) Message-ID: Date: Tue, 12 May 2026 10:37:32 -0700 Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 1/1] block/blk-mq: use atomic_t for quiesce_depth to avoid lock contention on RT To: "Ionut Nechita (Wind River)" , axboe@kernel.dk, linux-block@vger.kernel.org Cc: bigeasy@linutronix.de, clrkwllms@kernel.org, rostedt@goodmis.org, ming.lei@redhat.com, muchun.song@linux.dev, mkhalfella@purestorage.com, chris.friesen@windriver.com, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, linux-rt-users@vger.kernel.org, stable@vger.kernel.org, ionut_n2001@yahoo.com, sunlightlinux@gmail.com References: <20260512062815.10815-1-ionut.nechita@windriver.com> <20260512062815.10815-2-ionut.nechita@windriver.com> Content-Language: en-US From: Bart Van Assche In-Reply-To: <20260512062815.10815-2-ionut.nechita@windriver.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 5/11/26 11:28 PM, Ionut Nechita (Wind River) wrote: > Performance on the RT kernel and the hardware above: > - Before: 153 MB/s, IRQ threads in D-state on q->queue_lock > - After: 640 MB/s, no IRQ threads blocked Reviewed-by: Bart Van Assche