From patchwork Sat Apr 9 04:50:43 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12807448 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2A5BEC433F5 for ; Sat, 9 Apr 2022 04:52:49 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id A82668D0010; Sat, 9 Apr 2022 00:52:48 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A33A38D0007; Sat, 9 Apr 2022 00:52:48 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 835FE8D0010; Sat, 9 Apr 2022 00:52:48 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0128.hostedemail.com [216.40.44.128]) by kanga.kvack.org (Postfix) with ESMTP id 6C9698D0007 for ; Sat, 9 Apr 2022 00:52:48 -0400 (EDT) Received: from smtpin24.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 267BB18403C06 for ; Sat, 9 Apr 2022 04:52:48 +0000 (UTC) X-FDA: 79336120416.24.D017082 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by imf10.hostedemail.com (Postfix) with ESMTP id B3503C0005 for ; Sat, 9 Apr 2022 04:52:47 +0000 (UTC) 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=eypoqjBCbHteIGJMjEE77faduCfiNIsAQ0ydQeu7OQ0=; b=nqH1nBV8lOr2r5wyOjol3g7s8X NGopilIp147x4XNnQqzR5o2YWkY6IO58VVUojmV/ASvSDXVzRQHv+BqUNN8ISkIuVH5Huq+5W/+g6 Fx9NKN7nsNjG6IaaR01B6x8gfqb84JVGaMt2Mch/XsNqmw38mh/kWIOczl1+aSfojYjwvPWnkVT0z zeBYxWSj02o09fDuqh1c1ftABUKI9QxyXU2GCBR2V2aNbgjbyvKcSUL75+QEIgn+hIxNaN3b6eMN+ HQ75AhIB7YFYQ9KIFGF2dUiaHQ4ZLNQzEzLlTd1WzYc4Lz5oFphMfcUxRdKyObtKnqHpozib+pvzE Et/uKlCg==; Received: from 213-147-167-116.nat.highway.webapn.at ([213.147.167.116] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nd35G-0021rI-Lh; Sat, 09 Apr 2022 04:52:27 +0000 From: Christoph Hellwig To: Jens Axboe Cc: dm-devel@redhat.com, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-um@lists.infradead.org, linux-block@vger.kernel.org, drbd-dev@lists.linbit.com, nbd@other.debian.org, ceph-devel@vger.kernel.org, virtualization@lists.linux-foundation.org, xen-devel@lists.xenproject.org, linux-bcache@vger.kernel.org, linux-raid@vger.kernel.org, linux-mmc@vger.kernel.org, linux-mtd@lists.infradead.org, linux-nvme@lists.infradead.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, cluster-devel@redhat.com, jfs-discussion@lists.sourceforge.net, linux-nilfs@vger.kernel.org, ntfs3@lists.linux.dev, ocfs2-devel@oss.oracle.com, linux-mm@kvack.org Subject: [PATCH 27/27] direct-io: remove random prefetches Date: Sat, 9 Apr 2022 06:50:43 +0200 Message-Id: <20220409045043.23593-28-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220409045043.23593-1-hch@lst.de> References: <20220409045043.23593-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Authentication-Results: imf10.hostedemail.com; dkim=pass header.d=infradead.org header.s=bombadil.20210309 header.b=nqH1nBV8; spf=none (imf10.hostedemail.com: domain of BATV+43fc5532e856fea764d1+6803+infradead.org+hch@bombadil.srs.infradead.org has no SPF policy when checking 198.137.202.133) smtp.mailfrom=BATV+43fc5532e856fea764d1+6803+infradead.org+hch@bombadil.srs.infradead.org; dmarc=none X-Stat-Signature: zsx8tdi1cqwgx8a4whq6gozri6pcgrs9 X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: B3503C0005 X-HE-Tag: 1649479967-169433 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Randomly poking into block device internals for manual prefetches isn't exactly a very maintainable thing to do. And none of the performance criticil direct I/O implementations still use this library function anyway, so just drop it. Signed-off-by: Christoph Hellwig --- fs/direct-io.c | 32 ++++---------------------------- 1 file changed, 4 insertions(+), 28 deletions(-) diff --git a/fs/direct-io.c b/fs/direct-io.c index aef06e607b405..840752006f601 100644 --- a/fs/direct-io.c +++ b/fs/direct-io.c @@ -1115,11 +1115,10 @@ static inline int drop_refcount(struct dio *dio) * individual fields and will generate much worse code. This is important * for the whole file. */ -static inline ssize_t -do_blockdev_direct_IO(struct kiocb *iocb, struct inode *inode, - struct block_device *bdev, struct iov_iter *iter, - get_block_t get_block, dio_iodone_t end_io, - dio_submit_t submit_io, int flags) +ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode, + struct block_device *bdev, struct iov_iter *iter, + get_block_t get_block, dio_iodone_t end_io, + dio_submit_t submit_io, int flags) { unsigned i_blkbits = READ_ONCE(inode->i_blkbits); unsigned blkbits = i_blkbits; @@ -1334,29 +1333,6 @@ do_blockdev_direct_IO(struct kiocb *iocb, struct inode *inode, kmem_cache_free(dio_cache, dio); return retval; } - -ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode, - struct block_device *bdev, struct iov_iter *iter, - get_block_t get_block, - dio_iodone_t end_io, dio_submit_t submit_io, - int flags) -{ - /* - * The block device state is needed in the end to finally - * submit everything. Since it's likely to be cache cold - * prefetch it here as first thing to hide some of the - * latency. - * - * Attempt to prefetch the pieces we likely need later. - */ - prefetch(&bdev->bd_disk->part_tbl); - prefetch(bdev->bd_disk->queue); - prefetch((char *)bdev->bd_disk->queue + SMP_CACHE_BYTES); - - return do_blockdev_direct_IO(iocb, inode, bdev, iter, get_block, - end_io, submit_io, flags); -} - EXPORT_SYMBOL(__blockdev_direct_IO); static __init int dio_init(void)