path: root/fs/btrfs/ctree.h
diff options
authorDennis Zhou <dennis@kernel.org>2020-01-02 16:26:35 -0500
committerDavid Sterba <dsterba@suse.com>2020-01-20 16:40:59 +0100
commita2309300841207de28307ecd2f0e031fccde37a3 (patch)
tree8f84e7b531380c5330ac456baaedd5956998682d /fs/btrfs/ctree.h
parentbtrfs: keep track of discardable_bytes for async discard (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/ctree.h')
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 */