From mboxrd@z Thu Jan 1 00:00:00 1970 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 27E4B224D6; Wed, 19 Nov 2025 03:18:51 +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=1763522332; cv=none; b=G2SXxrUK1evOXJbHImLgKoqUiKgGPO7jZrztVo602S+KeOKDXhQ9HayRuQeoblanGLXfcf1vKhYjAu08++H1LBbLTMIcpOKCbyY4nja8FvRsYbUettahlyQvqEdk3JgzBskwEH9uBhRw+yQIhACW1F0ZGDSAlAkSLHXkhQEChr0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763522332; c=relaxed/simple; bh=E3DF++tFrql/hNnPhJQeHVmGnq+1kdEbHXsivsl7HyQ=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=ioIqIXVs8tLJCSR2hlpI58RWD+M4uu8fN5OCNqQrDeZ5d6eCwfMbZDQ52GBigE9O/9TTHpT2IW4oUFudyW8xzWfvfdizjltkzLTUpZZtK6aV+vKWCWAsrj5R1HaPwcWEr5mgYXOpeDvlKeFMHw2euFT8ApWMTeAXaEBXPCgGrWk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=tIoI6+l2; 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="tIoI6+l2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2B529C4AF0F; Wed, 19 Nov 2025 03:18:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763522331; bh=E3DF++tFrql/hNnPhJQeHVmGnq+1kdEbHXsivsl7HyQ=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=tIoI6+l2b2ijo3g1jSSKKQW/ODTp/9Jgvj0M04jLLZldVjZPK9jjYzYR2sWTOHkAZ OfOfRRsHAverJIB2+v3PHuE1Bg2OUCVUpx5dua4cJ1V5nQ/QYfdY8OzzbjNe9nWPGk xVskLRF0+B39JivbJ9p2z0fm9IjDOelW7Njs/4m5sgXoDltKmqOO2eHlWdmvwkWK4F g/nf5ZYT+mw8cOYnDMlpwtCFD0HzfM17G/tsUst8BUk/IXZLAxJ9XfVrQaXFU834/e duiLmbcejdKoOYKBkwmx/kgmip/PLBzKQtnifnOraJ7cHz/jOZWy/q435kMORkgiKr 1Zr79mz6lqwRg== Message-ID: <479228a9-c30b-4c7e-9129-ebf12ab2ec04@kernel.org> Date: Wed, 19 Nov 2025 12:18:46 +0900 Precedence: bulk X-Mailing-List: dm-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/3] dm-kcopyd: use REQ_ZWPLUG_UNORDERED To: Christoph Hellwig , Jens Axboe Cc: Mike Snitzer , Mikulas Patocka , linux-block@vger.kernel.org, dm-devel@lists.linux.dev References: <20251118070321.2367097-1-hch@lst.de> <20251118070321.2367097-4-hch@lst.de> Content-Language: en-US From: Damien Le Moal Organization: Western Digital Research In-Reply-To: <20251118070321.2367097-4-hch@lst.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 11/18/25 16:03, Christoph Hellwig wrote: > Use the new REQ_ZWPLUG_UNORDERED bio flag so that even copies to > sequential write required zones can queue up writes bios as soon as the > reads finish. This simplifies the code and reduces the submission > latency as all writes are immediately available in the zoned write plug > list when the previous write completes instead of going through two > layers of queueing. > > Signed-off-by: Christoph Hellwig Nice cleanup ! Reviewed-by: Damien Le Moal -- Damien Le Moal Western Digital Research