From patchwork Tue Mar 22 21:39:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 12789062 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 8BEA1C433F5 for ; Tue, 22 Mar 2022 21:39:40 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 231E06B0074; Tue, 22 Mar 2022 17:39:40 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 1BB7A6B0093; Tue, 22 Mar 2022 17:39:40 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0365E6B0095; Tue, 22 Mar 2022 17:39:39 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0223.hostedemail.com [216.40.44.223]) by kanga.kvack.org (Postfix) with ESMTP id E24EA6B0074 for ; Tue, 22 Mar 2022 17:39:39 -0400 (EDT) Received: from smtpin22.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id A6D08A3EFA for ; Tue, 22 Mar 2022 21:39:39 +0000 (UTC) X-FDA: 79273339278.22.BFA0436 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by imf16.hostedemail.com (Postfix) with ESMTP id 8253A18002A for ; Tue, 22 Mar 2022 21:39:10 +0000 (UTC) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 6D03DB81DAB; Tue, 22 Mar 2022 21:39:09 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0731EC340EC; Tue, 22 Mar 2022 21:39:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1647985148; bh=A6AhwR3cGuGHtuxqGn2j0YO1fLY1CKeKfViYF+PApIc=; h=Date:To:From:In-Reply-To:Subject:From; b=1iwLDBGwcsEZe9Oc/elpWJDrb5Sv9atqIGVVa8SQkXTDVIu7H+rTGwRrEEpaQ6CgU 0AyQUZTyMCssM8ycx31aZuvOVcYg0VKR5RjkBh+qfZYIZNmQBhS8fjp5myLYR4oRdr /C1WEdryPyNJRWc2c//hFrb9ulFWgqTTnZGYmqdY= Date: Tue, 22 Mar 2022 14:39:07 -0700 To: trond.myklebust@hammerspace.com,philipp.reisner@linbit.com,paolo.valente@linaro.org,miklos@szeredi.hu,lars.ellenberg@linbit.com,konishi.ryusuke@gmail.com,jlayton@kernel.org,jaegeuk@kernel.org,jack@suse.cz,idryomov@gmail.com,fengguang.wu@intel.com,djwong@kernel.org,chao@kernel.org,axboe@kernel.dk,Anna.Schumaker@Netapp.com,neilb@suse.de,akpm@linux-foundation.org,patches@lists.linux.dev,linux-mm@kvack.org,mm-commits@vger.kernel.org,torvalds@linux-foundation.org,akpm@linux-foundation.org From: Andrew Morton In-Reply-To: <20220322143803.04a5e59a07e48284f196a2f9@linux-foundation.org> Subject: [patch 012/227] remove inode_congested() Message-Id: <20220322213908.0731EC340EC@smtp.kernel.org> X-Rspam-User: Authentication-Results: imf16.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=1iwLDBGw; spf=pass (imf16.hostedemail.com: domain of akpm@linux-foundation.org designates 145.40.68.75 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org; dmarc=none X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 8253A18002A X-Stat-Signature: ox797jypbuebe377ydx3wo6bruapoqio X-HE-Tag: 1647985150-220281 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: From: NeilBrown Subject: remove inode_congested() inode_congested() reports if the backing-device for the inode is congested. No bdi reports congestion any more, so this always returns 'false'. So remove inode_congested() and related functions, and remove the call sites, assuming that inode_congested() always returns 'false'. Link: https://lkml.kernel.org/r/164549983741.9187.2174285592262191311.stgit@noble.brown Signed-off-by: NeilBrown Cc: Anna Schumaker Cc: Chao Yu Cc: Darrick J. Wong Cc: Ilya Dryomov Cc: Jaegeuk Kim Cc: Jan Kara Cc: Jeff Layton Cc: Jens Axboe Cc: Lars Ellenberg Cc: Miklos Szeredi Cc: Paolo Valente Cc: Philipp Reisner Cc: Ryusuke Konishi Cc: Trond Myklebust Cc: Wu Fengguang Signed-off-by: Andrew Morton --- fs/fs-writeback.c | 37 ---------------------------------- include/linux/backing-dev.h | 22 -------------------- mm/fadvise.c | 5 +--- mm/readahead.c | 6 ----- mm/vmscan.c | 17 --------------- 5 files changed, 3 insertions(+), 84 deletions(-) --- a/fs/fs-writeback.c~remove-inode_congested +++ a/fs/fs-writeback.c @@ -894,43 +894,6 @@ void wbc_account_cgroup_owner(struct wri EXPORT_SYMBOL_GPL(wbc_account_cgroup_owner); /** - * inode_congested - test whether an inode is congested - * @inode: inode to test for congestion (may be NULL) - * @cong_bits: mask of WB_[a]sync_congested bits to test - * - * Tests whether @inode is congested. @cong_bits is the mask of congestion - * bits to test and the return value is the mask of set bits. - * - * If cgroup writeback is enabled for @inode, the congestion state is - * determined by whether the cgwb (cgroup bdi_writeback) for the blkcg - * associated with @inode is congested; otherwise, the root wb's congestion - * state is used. - * - * @inode is allowed to be NULL as this function is often called on - * mapping->host which is NULL for the swapper space. - */ -int inode_congested(struct inode *inode, int cong_bits) -{ - /* - * Once set, ->i_wb never becomes NULL while the inode is alive. - * Start transaction iff ->i_wb is visible. - */ - if (inode && inode_to_wb_is_valid(inode)) { - struct bdi_writeback *wb; - struct wb_lock_cookie lock_cookie = {}; - bool congested; - - wb = unlocked_inode_to_wb_begin(inode, &lock_cookie); - congested = wb_congested(wb, cong_bits); - unlocked_inode_to_wb_end(inode, &lock_cookie); - return congested; - } - - return wb_congested(&inode_to_bdi(inode)->wb, cong_bits); -} -EXPORT_SYMBOL_GPL(inode_congested); - -/** * wb_split_bdi_pages - split nr_pages to write according to bandwidth * @wb: target bdi_writeback to split @nr_pages to * @nr_pages: number of pages to write for the whole bdi --- a/include/linux/backing-dev.h~remove-inode_congested +++ a/include/linux/backing-dev.h @@ -162,7 +162,6 @@ struct bdi_writeback *wb_get_create(stru gfp_t gfp); void wb_memcg_offline(struct mem_cgroup *memcg); void wb_blkcg_offline(struct blkcg *blkcg); -int inode_congested(struct inode *inode, int cong_bits); /** * inode_cgwb_enabled - test whether cgroup writeback is enabled on an inode @@ -390,29 +389,8 @@ static inline void wb_blkcg_offline(stru { } -static inline int inode_congested(struct inode *inode, int cong_bits) -{ - return wb_congested(&inode_to_bdi(inode)->wb, cong_bits); -} - #endif /* CONFIG_CGROUP_WRITEBACK */ -static inline int inode_read_congested(struct inode *inode) -{ - return inode_congested(inode, 1 << WB_sync_congested); -} - -static inline int inode_write_congested(struct inode *inode) -{ - return inode_congested(inode, 1 << WB_async_congested); -} - -static inline int inode_rw_congested(struct inode *inode) -{ - return inode_congested(inode, (1 << WB_sync_congested) | - (1 << WB_async_congested)); -} - static inline int bdi_congested(struct backing_dev_info *bdi, int cong_bits) { return wb_congested(&bdi->wb, cong_bits); --- a/mm/fadvise.c~remove-inode_congested +++ a/mm/fadvise.c @@ -109,9 +109,8 @@ int generic_fadvise(struct file *file, l case POSIX_FADV_NOREUSE: break; case POSIX_FADV_DONTNEED: - if (!inode_write_congested(mapping->host)) - __filemap_fdatawrite_range(mapping, offset, endbyte, - WB_SYNC_NONE); + __filemap_fdatawrite_range(mapping, offset, endbyte, + WB_SYNC_NONE); /* * First and last FULL page! Partial pages are deliberately --- a/mm/readahead.c~remove-inode_congested +++ a/mm/readahead.c @@ -709,12 +709,6 @@ void page_cache_async_ra(struct readahea folio_clear_readahead(folio); - /* - * Defer asynchronous read-ahead on IO congestion. - */ - if (inode_read_congested(ractl->mapping->host)) - return; - if (blk_cgroup_congested()) return; --- a/mm/vmscan.c~remove-inode_congested +++ a/mm/vmscan.c @@ -989,17 +989,6 @@ static inline int is_page_cache_freeable return page_count(page) - page_has_private(page) == 1 + page_cache_pins; } -static int may_write_to_inode(struct inode *inode) -{ - if (current->flags & PF_SWAPWRITE) - return 1; - if (!inode_write_congested(inode)) - return 1; - if (inode_to_bdi(inode) == current->backing_dev_info) - return 1; - return 0; -} - /* * We detected a synchronous write error writing a page out. Probably * -ENOSPC. We need to propagate that into the address_space for a subsequent @@ -1201,8 +1190,6 @@ static pageout_t pageout(struct page *pa } if (mapping->a_ops->writepage == NULL) return PAGE_ACTIVATE; - if (!may_write_to_inode(mapping->host)) - return PAGE_KEEP; if (clear_page_dirty_for_io(page)) { int res; @@ -1578,9 +1565,7 @@ retry: * end of the LRU a second time. */ mapping = page_mapping(page); - if (((dirty || writeback) && mapping && - inode_write_congested(mapping->host)) || - (writeback && PageReclaim(page))) + if (writeback && PageReclaim(page)) stat->nr_congested++; /*