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| 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/ctree.h | |
| parent | btrfs: keep track of discardable_bytes for async discard (diff) | |
| download | linux-dev-a2309300841207de28307ecd2f0e031fccde37a3.tar.xz linux-dev-a2309300841207de28307ecd2f0e031fccde37a3.zip | |
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/ctree.h')
| -rw-r--r-- | fs/btrfs/ctree.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 7c1c236d13ae..451dade0a4bb 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -468,6 +468,8 @@ struct btrfs_discard_ctl { struct list_head discard_list[BTRFS_NR_DISCARD_LISTS]; atomic_t discardable_extents; atomic64_t discardable_bytes; + unsigned long delay; + u32 iops_limit; }; /* delayed seq elem */ |