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authorNeilBrown <neilb@suse.de>2022-03-23 00:39:19 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-03-23 01:57:01 +0300
commita88f2096d5a2d91179db5dd9aa8f60dc3df9bb3e (patch)
treea10b8280a239a6ff43b68532a0018a113883015f /mm/backing-dev.c
parentf6bad159f5d5e5b33531aba3d9b860ad8618afe0 (diff)
downloadlinux-a88f2096d5a2d91179db5dd9aa8f60dc3df9bb3e.tar.xz
remove congestion tracking framework
This framework is no longer used - so discard it. Link: https://lkml.kernel.org/r/164549983747.9187.6171768583526866601.stgit@noble.brown Signed-off-by: NeilBrown <neilb@suse.de> Cc: Anna Schumaker <Anna.Schumaker@Netapp.com> Cc: Chao Yu <chao@kernel.org> Cc: Darrick J. Wong <djwong@kernel.org> Cc: Ilya Dryomov <idryomov@gmail.com> Cc: Jaegeuk Kim <jaegeuk@kernel.org> Cc: Jan Kara <jack@suse.cz> Cc: Jeff Layton <jlayton@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Lars Ellenberg <lars.ellenberg@linbit.com> Cc: Miklos Szeredi <miklos@szeredi.hu> Cc: Paolo Valente <paolo.valente@linaro.org> Cc: Philipp Reisner <philipp.reisner@linbit.com> Cc: Ryusuke Konishi <konishi.ryusuke@gmail.com> Cc: Trond Myklebust <trond.myklebust@hammerspace.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/backing-dev.c')
-rw-r--r--mm/backing-dev.c57
1 files changed, 0 insertions, 57 deletions
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);