From patchwork Tue Nov 19 12:16:22 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13879832 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 51F1D1CF289; Tue, 19 Nov 2024 12:17:02 +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=1732018623; cv=none; b=tAo9l60cppDUwzamMlJ8FCG6AldPq7zTPD59TIoO1jpTH+ApM5Mihc7z+7uFD0AzgnY0YDPuwTub7BtJwU8IPDOOjd1fs9aqlLW/j+EhkWHaaOvHt48iN44n6N/6mo13QmLEbxZWNJ9FTBx/YhE58dEt13/rYAL5Yulqyl2m2n0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732018623; c=relaxed/simple; bh=tK1FNVzdgHIIBvw83RVPT/pLcRnmnwTOFgu64lamD28=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gPjE22eP7BkcO8WY4yPToV8g2r10aLm7daG9dGPyZ2QJINPF+Sr2lj9lywtOwWUSbAghpb4NBXC1nuwqTL2EVW4ZBWx9aaig3QUeVCnxPiOhbF+9b5Bg1j334rHt2HNvLDquCX38hNOwQG/7le8ebP+Y/oMiECDZwE9CDKWMbS0= 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=Hi+i98Ze; 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="Hi+i98Ze" 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=fiaGOzS1KSxfi38Yqhc2LV5s9eWPffbt+V/ZrP6bNEQ=; b=Hi+i98ZeFrxGdbvrRMqXUysCNQ jxnLn0pWimfexW7NQxQbRmZYyhui+Q8AM+FWggZv87mukrtYTzXvfqO34T5Q4/jrqRR78TgeC167j C+nN/HnL3aW08pkVyVT7Ye+j9EKAw+fYM6Z6IgBHvaeUPJdFM2Ns2q4eTpnQlvLI/S9oWY5Zm2VgP /ZJk+Qhf21mf3oBAQ8Bx7RQ5lcBsZ7rK4YzDs121Q99eku2WZm6g3O9znE/HaKNF/46Dtg+MhfcoZ fflkVZYQKHa82Vme8uFzKoINjv0XX+nw571c+JjOCTiUi3aj1L6AFTpfJ3R7k3qDTO+G94jawhRNH 1tMYJ+ng==; Received: from 2a02-8389-2341-5b80-1731-a089-d2b1-3edf.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:1731:a089:d2b1:3edf] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tDNAB-0000000CJ5P-3p2F; Tue, 19 Nov 2024 12:17:00 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Christian Brauner , Keith Busch , Sagi Grimberg , Kanchan Joshi , Hui Qi , Nitesh Shetty , Jan Kara , Pavel Begunkov , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-fsdevel@vger.kernel.org, io-uring@vger.kernel.org Subject: [PATCH 08/15] block: introduce a write_stream_granularity queue limit Date: Tue, 19 Nov 2024 13:16:22 +0100 Message-ID: <20241119121632.1225556-9-hch@lst.de> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20241119121632.1225556-1-hch@lst.de> References: <20241119121632.1225556-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Export the granularity that write streams should be discarded with, as it is essential for making good use of them. Signed-off-by: Christoph Hellwig --- Documentation/ABI/stable/sysfs-block | 8 ++++++++ block/blk-sysfs.c | 3 +++ include/linux/blkdev.h | 7 +++++++ 3 files changed, 18 insertions(+) diff --git a/Documentation/ABI/stable/sysfs-block b/Documentation/ABI/stable/sysfs-block index ae8644726422..9f2a3005c41c 100644 --- a/Documentation/ABI/stable/sysfs-block +++ b/Documentation/ABI/stable/sysfs-block @@ -514,6 +514,14 @@ Description: supported. If supported, valid values are 1 through max_write_streams, inclusive. +What: /sys/block//queue/write_stream_granularity +Date: November 2024 +Contact: linux-block@vger.kernel.org +Description: + [RO] Granularity of a write stream in bytes. The granularity + of a write stream is the size that should be discarded or + overwritten together to avoid write amplification in the device. + What: /sys/block//queue/max_segments Date: March 2010 Contact: linux-block@vger.kernel.org diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index c514c0cb5e93..525f4fa132cd 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -105,6 +105,7 @@ QUEUE_SYSFS_LIMIT_SHOW(max_discard_segments) QUEUE_SYSFS_LIMIT_SHOW(max_integrity_segments) QUEUE_SYSFS_LIMIT_SHOW(max_segment_size) QUEUE_SYSFS_LIMIT_SHOW(max_write_streams) +QUEUE_SYSFS_LIMIT_SHOW(write_stream_granularity) QUEUE_SYSFS_LIMIT_SHOW(logical_block_size) QUEUE_SYSFS_LIMIT_SHOW(physical_block_size) QUEUE_SYSFS_LIMIT_SHOW(chunk_sectors) @@ -448,6 +449,7 @@ QUEUE_RO_ENTRY(queue_max_segments, "max_segments"); QUEUE_RO_ENTRY(queue_max_integrity_segments, "max_integrity_segments"); QUEUE_RO_ENTRY(queue_max_segment_size, "max_segment_size"); QUEUE_RO_ENTRY(queue_max_write_streams, "max_write_streams"); +QUEUE_RO_ENTRY(queue_write_stream_granularity, "write_stream_granularity"); QUEUE_RW_LOAD_MODULE_ENTRY(elv_iosched, "scheduler"); QUEUE_RO_ENTRY(queue_logical_block_size, "logical_block_size"); @@ -583,6 +585,7 @@ static struct attribute *queue_attrs[] = { &queue_max_integrity_segments_entry.attr, &queue_max_segment_size_entry.attr, &queue_max_write_streams_entry.attr, + &queue_write_stream_granularity_entry.attr, &queue_hw_sector_size_entry.attr, &queue_logical_block_size_entry.attr, &queue_physical_block_size_entry.attr, diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 202e1becd410..9fda66530d9a 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -396,6 +396,7 @@ struct queue_limits { unsigned short max_discard_segments; unsigned short max_write_streams; + unsigned int write_stream_granularity; unsigned int max_open_zones; unsigned int max_active_zones; @@ -1245,6 +1246,12 @@ static inline unsigned short bdev_max_write_streams(struct block_device *bdev) return bdev_limits(bdev)->max_write_streams; } +static inline unsigned int +bdev_write_stream_granularity(struct block_device *bdev) +{ + return bdev_limits(bdev)->write_stream_granularity; +} + static inline unsigned queue_logical_block_size(const struct request_queue *q) { return q->limits.logical_block_size;