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Date: Thu, 10 Feb 2022 16:37:52 +1100 From: NeilBrown <neilb@...e.de> To: Andrew Morton <akpm@...ux-foundation.org>, Jan Kara <jack@...e.cz>, Wu Fengguang <fengguang.wu@...el.com>, Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>, Jeff Layton <jlayton@...nel.org>, Ilya Dryomov <idryomov@...il.com>, Miklos Szeredi <miklos@...redi.hu>, Trond Myklebust <trond.myklebust@...merspace.com>, Anna Schumaker <anna.schumaker@...app.com>, Ryusuke Konishi <konishi.ryusuke@...il.com>, "Darrick J. Wong" <djwong@...nel.org>, Philipp Reisner <philipp.reisner@...bit.com>, Lars Ellenberg <lars.ellenberg@...bit.com>, Paolo Valente <paolo.valente@...aro.org>, Jens Axboe <axboe@...nel.dk> Cc: linux-doc@...r.kernel.org, linux-mm@...ck.org, linux-nilfs@...r.kernel.org, linux-nfs@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net, linux-ext4@...r.kernel.org, ceph-devel@...r.kernel.org, drbd-dev@...ts.linbit.com, linux-kernel@...r.kernel.org, linux-block@...r.kernel.org Subject: [PATCH 11/11] Remove congestion tracking framework. This framework is no longer used - so discard it. Signed-off-by: NeilBrown <neilb@...e.de> --- include/linux/backing-dev-defs.h | 8 ----- include/linux/backing-dev.h | 2 - include/trace/events/writeback.h | 28 ------------------- mm/backing-dev.c | 57 -------------------------------------- 4 files changed, 95 deletions(-) diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h index 993c5628a726..e863c88df95f 100644 --- a/include/linux/backing-dev-defs.h +++ b/include/linux/backing-dev-defs.h @@ -207,14 +207,6 @@ struct backing_dev_info { #endif }; -enum { - BLK_RW_ASYNC = 0, - BLK_RW_SYNC = 1, -}; - -void clear_bdi_congested(struct backing_dev_info *bdi, int sync); -void set_bdi_congested(struct backing_dev_info *bdi, int sync); - struct wb_lock_cookie { bool locked; unsigned long flags; diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h index 2d764566280c..87ce24d238f3 100644 --- a/include/linux/backing-dev.h +++ b/include/linux/backing-dev.h @@ -135,8 +135,6 @@ static inline bool writeback_in_progress(struct bdi_writeback *wb) struct backing_dev_info *inode_to_bdi(struct inode *inode); -long congestion_wait(int sync, long timeout); - static inline bool mapping_can_writeback(struct address_space *mapping) { return inode_to_bdi(mapping->host)->capabilities & BDI_CAP_WRITEBACK; diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h index a345b1e12daf..86b2a82da546 100644 --- a/include/trace/events/writeback.h +++ b/include/trace/events/writeback.h @@ -735,34 +735,6 @@ TRACE_EVENT(writeback_sb_inodes_requeue, ) ); -DECLARE_EVENT_CLASS(writeback_congest_waited_template, - - TP_PROTO(unsigned int usec_timeout, unsigned int usec_delayed), - - TP_ARGS(usec_timeout, usec_delayed), - - TP_STRUCT__entry( - __field( unsigned int, usec_timeout ) - __field( unsigned int, usec_delayed ) - ), - - TP_fast_assign( - __entry->usec_timeout = usec_timeout; - __entry->usec_delayed = usec_delayed; - ), - - TP_printk("usec_timeout=%u usec_delayed=%u", - __entry->usec_timeout, - __entry->usec_delayed) -); - -DEFINE_EVENT(writeback_congest_waited_template, writeback_congestion_wait, - - TP_PROTO(unsigned int usec_timeout, unsigned int usec_delayed), - - TP_ARGS(usec_timeout, usec_delayed) -); - DECLARE_EVENT_CLASS(writeback_single_inode_template, TP_PROTO(struct inode *inode, diff --git a/mm/backing-dev.c b/mm/backing-dev.c index eae96dfe0261..7176af65b103 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -1005,60 +1005,3 @@ const char *bdi_dev_name(struct backing_dev_info *bdi) return bdi->dev_name; } EXPORT_SYMBOL_GPL(bdi_dev_name); - -static wait_queue_head_t congestion_wqh[2] = { - __WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[0]), - __WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[1]) - }; -static atomic_t nr_wb_congested[2]; - -void clear_bdi_congested(struct backing_dev_info *bdi, int sync) -{ - wait_queue_head_t *wqh = &congestion_wqh[sync]; - enum wb_congested_state bit; - - bit = sync ? WB_sync_congested : WB_async_congested; - if (test_and_clear_bit(bit, &bdi->wb.congested)) - atomic_dec(&nr_wb_congested[sync]); - smp_mb__after_atomic(); - if (waitqueue_active(wqh)) - wake_up(wqh); -} -EXPORT_SYMBOL(clear_bdi_congested); - -void set_bdi_congested(struct backing_dev_info *bdi, int sync) -{ - enum wb_congested_state bit; - - bit = sync ? WB_sync_congested : WB_async_congested; - if (!test_and_set_bit(bit, &bdi->wb.congested)) - atomic_inc(&nr_wb_congested[sync]); -} -EXPORT_SYMBOL(set_bdi_congested); - -/** - * congestion_wait - wait for a backing_dev to become uncongested - * @sync: SYNC or ASYNC IO - * @timeout: timeout in jiffies - * - * Waits for up to @timeout jiffies for a backing_dev (any backing_dev) to exit - * write congestion. If no backing_devs are congested then just wait for the - * next write to be completed. - */ -long congestion_wait(int sync, long timeout) -{ - long ret; - unsigned long start = jiffies; - DEFINE_WAIT(wait); - wait_queue_head_t *wqh = &congestion_wqh[sync]; - - prepare_to_wait(wqh, &wait, TASK_UNINTERRUPTIBLE); - ret = io_schedule_timeout(timeout); - finish_wait(wqh, &wait); - - trace_writeback_congestion_wait(jiffies_to_usecs(timeout), - jiffies_to_usecs(jiffies - start)); - - return ret; -} -EXPORT_SYMBOL(congestion_wait);
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