From patchwork Fri Apr 5 04:41:47 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Damien Le Moal X-Patchwork-Id: 13618489 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 BF24928DC8; Fri, 5 Apr 2024 04:42:21 +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=1712292141; cv=none; b=opW++wETkdsXD2Cm7wXeD94WLRQFbZVfrwEkomNtEmDjgJSRLxs/ubrWQkNtRKauitAB9BXZ6ZGSyCXn5R+coGk7VPoItLdAxqmL1OgVHI4Q0o6sIYR9aDrUjvoffrw+/FvLRt0eBi8M+bQ5YXZpbSjHNsbqfX11rZN1X6eQDdk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712292141; c=relaxed/simple; bh=mpcFRXoG1iMUnEM0OJum7HEVIuA8He6TG6rQRr9K+4k=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=d3ElMhxg/GPC/ghQGI92POGdt4OLjfTkEf9yLoxWgIgtha7NenQmpR967Jw/mY0Z+xHZmzHN9IW+y6J3Kj0MCNZLkG0VteWErIKy+aPJeb8AxXxyqU4WoQViNA3whqtIaPlit7wsOtXkBUB5Cy10Gk+oHeKXamcpu0fm5ouZRTw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=At2cEnKt; 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="At2cEnKt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 38B25C433F1; Fri, 5 Apr 2024 04:42:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1712292141; bh=mpcFRXoG1iMUnEM0OJum7HEVIuA8He6TG6rQRr9K+4k=; h=From:To:Subject:Date:In-Reply-To:References:From; b=At2cEnKt2L9Q9vb2PetC3IFEmYbwWZOJGbncRBPJLIxLO4tWws+3EE1FXt0Rj2IiY x6YB585F/YTFBfOLlRZVt6XhHfxbt4q/SI1oG6yIgVPFf+2bC8F/gHqlg3J0ecf7s7 +90qAIpdkPhqsnBGVPI3minHNA/TFct4SvW/+sWSKjV6H3XixirLS3F/9aIICEDM08 EjlvtZuviOnAqqp1PYXjizFuAp68GVEg2Y20r62msdDCH4pjL3BAfzrt2Ql33/eRzj MyOOEBx8HHsqRE2zaAVzVVKtzAJ/n6sDYebZFkbU4KxtgInlfRZuJM1NQcatf6r+TT XN6PA0r9tvROA== From: Damien Le Moal To: linux-block@vger.kernel.org, Jens Axboe , linux-scsi@vger.kernel.org, "Martin K . Petersen" , dm-devel@lists.linux.dev, Mike Snitzer , linux-nvme@lists.infradead.org, Keith Busch , Christoph Hellwig Subject: [PATCH v6 08/28] block: Fake max open zones limit when there is no limit Date: Fri, 5 Apr 2024 13:41:47 +0900 Message-ID: <20240405044207.1123462-9-dlemoal@kernel.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240405044207.1123462-1-dlemoal@kernel.org> References: <20240405044207.1123462-1-dlemoal@kernel.org> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 For a zoned block device that has no limit on the number of open zones and no limit on the number of active zones, the zone write plug mempool is created with a size of 128 zone write plugs. For such case, set the device max_open_zones queue limit to this value to indicate to the user the potential performance penalty that may happen when writing simultaneously to more zones than the mempool size. Signed-off-by: Damien Le Moal Reviewed-by: Christoph Hellwig Reviewed-by: Hannes Reinecke Reviewed-by: Bart Van Assche Tested-by: Hans Holmberg --- block/blk-zoned.c | 41 +++++++++++++++++++++++++++++++++++------ 1 file changed, 35 insertions(+), 6 deletions(-) diff --git a/block/blk-zoned.c b/block/blk-zoned.c index fefcebd70445..4b21a1ec00d4 100644 --- a/block/blk-zoned.c +++ b/block/blk-zoned.c @@ -1503,6 +1503,38 @@ struct blk_revalidate_zone_args { sector_t sector; }; +/* + * Update the disk zone resources information and device queue limits. + * The disk queue is frozen when this is executed. + */ +static int disk_update_zone_resources(struct gendisk *disk, + struct blk_revalidate_zone_args *args) +{ + struct request_queue *q = disk->queue; + struct queue_limits lim; + + disk->nr_zones = args->nr_zones; + disk->zone_capacity = args->zone_capacity; + swap(disk->seq_zones_wlock, args->seq_zones_wlock); + swap(disk->conv_zones_bitmap, args->conv_zones_bitmap); + + /* + * If the device has no limit on the maximum number of open and active + * zones, set its max open zone limit to the mempool size to indicate + * to the user that there is a potential performance impact due to + * dynamic zone write plug allocation when simultaneously writing to + * more zones than the size of the mempool. + */ + if (disk->zone_wplugs_pool) { + lim = queue_limits_start_update(q); + if (!lim.max_open_zones && !lim.max_active_zones) + lim.max_open_zones = disk->zone_wplugs_pool->min_nr; + return queue_limits_commit_update(q, &lim); + } + + return 0; +} + /* * Helper function to check the validity of zones of a zoned block device. */ @@ -1703,17 +1735,14 @@ int blk_revalidate_disk_zones(struct gendisk *disk, */ blk_mq_freeze_queue(q); if (ret > 0) { - disk->nr_zones = args.nr_zones; - disk->zone_capacity = args.zone_capacity; - swap(disk->seq_zones_wlock, args.seq_zones_wlock); - swap(disk->conv_zones_bitmap, args.conv_zones_bitmap); + ret = disk_update_zone_resources(disk, &args); if (update_driver_data) update_driver_data(disk); - ret = 0; } else { pr_warn("%s: failed to revalidate zones\n", disk->disk_name); - disk_free_zone_resources(disk); } + if (ret) + disk_free_zone_resources(disk); blk_mq_unfreeze_queue(q); kfree(args.seq_zones_wlock);