diff options
| author | Dennis Zhou <dennis@kernel.org> | 2020-01-02 16:26:35 -0500 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2020-01-20 16:40:59 +0100 |
| commit | a2309300841207de28307ecd2f0e031fccde37a3 (patch) | |
| tree | 8f84e7b531380c5330ac456baaedd5956998682d /fs/btrfs/extent-tree.c | |
| parent | 5dc7c10b87474c98116d3438739743cd77263e9f (diff) | |
btrfs: calculate discard delay based on number of extents
An earlier patch keeps track of discardable_extents. These are
undiscarded extents managed by the free space cache. Here, we will use
this to dynamically calculate the discard delay interval.
There are 3 rate to consider. The first is the target convergence rate,
the rate to discard all discardable_extents over the
BTRFS_DISCARD_TARGET_MSEC time frame. This is clamped by the lower
limit, the iops limit or BTRFS_DISCARD_MIN_DELAY (1ms), and the upper
limit, BTRFS_DISCARD_MAX_DELAY (1s). We reevaluate this delay every
transaction commit.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/extent-tree.c')
| -rw-r--r-- | fs/btrfs/extent-tree.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 2c12366cfde5..0163fdd59f8f 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -2935,8 +2935,10 @@ int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans) cond_resched(); } - if (btrfs_test_opt(fs_info, DISCARD_ASYNC)) + if (btrfs_test_opt(fs_info, DISCARD_ASYNC)) { + btrfs_discard_calc_delay(&fs_info->discard_ctl); btrfs_discard_schedule_work(&fs_info->discard_ctl, true); + } /* * Transaction is finished. We don't need the lock anymore. We |