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btrfs: only clamp the first time we have to start flushing 

We were clamping the threshold for preemptive reclaim any time we added
a ticket to wait on, which if we have a lot of threads means we'd
essentially max out the clamp the first time we start to flush.

Instead of doing this, simply do it every time we have to start
flushing, this will make us ramp up gradually instead of going to max
clamping as soon as we start needing to do flushing.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2021-04-28 13:38:43 -04:00 committed by David Sterba
parent ed738ba7f9
commit 0aae4ca9e9
1 changed files with 9 additions and 8 deletions
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17
fs/btrfs/space-info.c
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@ -1561,6 +1561,15 @@ static int __reserve_bytes(struct btrfs_fs_info *fs_info,
flush == BTRFS_RESERVE_FLUSH_DATA) {
list_add_tail(&ticket.list, &space_info->tickets);
if (!space_info->flush) {
/*
* We were forced to add a reserve ticket, so
* our preemptive flushing is unable to keep
* up. Clamp down on the threshold for the
* preemptive flushing in order to keep up with
* the workload.
*/
maybe_clamp_preempt(fs_info, space_info);
space_info->flush = 1;
trace_btrfs_trigger_flush(fs_info,
space_info->flags,
@ -1572,14 +1581,6 @@ static int __reserve_bytes(struct btrfs_fs_info *fs_info,
list_add_tail(&ticket.list,
&space_info->priority_tickets);
}
/*
* We were forced to add a reserve ticket, so our preemptive
* flushing is unable to keep up. Clamp down on the threshold
* for the preemptive flushing in order to keep up with the
* workload.
*/
maybe_clamp_preempt(fs_info, space_info);
} else if (!ret && space_info->flags & BTRFS_BLOCK_GROUP_METADATA) {
used += orig_bytes;
/*