From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 25F3E70835; Wed, 13 Nov 2024 15:21:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731511275; cv=none; b=gjhP5c/8wmYtWcJb/UY7BG92Eea6J+ewP+UrIEaTvdi1jQTvQILk+NEn5l277agnqbwo3eWTXfc7MUXoMMR2PKr5fORUuQZXof3JNeBqn+4IV+fDddAsAdrp2Weh5QY7JjctVota/tacrEwdaSP+eYXKtAvJaQuQzqJdTo0RKLs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731511275; c=relaxed/simple; bh=ecvWJqsRiB/VRI5B56crQpyOWmaLA93kDwgOG2jJ2ZE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=UlX81WjKAGX2nYbinF4jLl55ME2RwmC4Tb0E0jp2oKJZJhZasZQd3rvEqeKs7mvlYjRFla4529xWV5+hdX8TzKTWlBwz0bk2vK96yqMBPUxEwnJJeAlyon1RlpR0cSgDo3oM+Cq8IZbests2ZeX9gT7t6BHk1rfMmZJ9w2ev6+o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=AlIa+7s8; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="AlIa+7s8" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=AULfdb3WZgUO3JCKZ2NM+vw/f0W+uRYWQJj+bN/yryk=; b=AlIa+7s8bcByfyT4pi1KwnL8zm EyYjDJyy1S8BoGAb7pG0NE6DrmQhIVIngymlzbjZxbZOmFoWEEevcSRM25SrwCDGfibYKG6UG47ca nASGpl3qb3Mv5SBYhtj1Kj7QZVnBcv+Q8wPjaXDpnldK69NIhFtan7293NDNeOd5mbiOCutokx3D5 vg5qSuHVR761erPoNGsVr21TWJ9avGW5oHqErUG/RjgXAZ+0F6WFs3e/Mk3F5sAZAQR4J6ADXiixP PuCwqkTtsxUdK+aIz+mMJ0xdEJ1qgHr3dfj0Uu3lpKHfkswLKI6oSJb3oUyI2d0r9HOdDACRH6/Mb 5jkNDTgg==; Received: from 2a02-8389-2341-5b80-9e61-c6cf-2f07-a796.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:9e61:c6cf:2f07:a796] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tBFB9-00000007HS5-2HE3; Wed, 13 Nov 2024 15:21:12 +0000 From: Christoph Hellwig To: Jens Axboe Cc: "Michael S. Tsirkin" , Jason Wang , Keith Busch , Sagi Grimberg , Pavel Begunkov , linux-block@vger.kernel.org, virtualization@lists.linux.dev, linux-nvme@lists.infradead.org, io-uring@vger.kernel.org Subject: [PATCH 6/6] block: don't reorder requests in blk_mq_add_to_batch Date: Wed, 13 Nov 2024 16:20:46 +0100 Message-ID: <20241113152050.157179-7-hch@lst.de> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20241113152050.157179-1-hch@lst.de> References: <20241113152050.157179-1-hch@lst.de> Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html LIFO ordering for batched completions is a bit unexpected and also defeats some merging optimizations in e.g. the XFS buffered write code. Now that we can easily add the request to the tail of the list do that. Signed-off-by: Christoph Hellwig --- include/linux/blk-mq.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index c61e04365677..c596e0e4cb75 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -884,7 +884,7 @@ static inline bool blk_mq_add_to_batch(struct request *req, else if (iob->complete != complete) return false; iob->need_ts |= blk_mq_need_time_stamp(req); - rq_list_add_head(&iob->req_list, req); + rq_list_add_tail(&iob->req_list, req); return true; } -- 2.45.2