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bcachefs: Account for ioclock slop when throttling rebalance thread

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This should fix an issue where the rebalance thread was spinning

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2020-04-07 13:49:14 -04:00 committed by Kent Overstreet
parent 0f9dda478f
commit e77e4efce3
1 changed files with 10 additions and 6 deletions
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16
fs/bcachefs/rebalance.c
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@ -204,17 +204,21 @@ static int bch2_rebalance_thread(void *arg)
prev_run_time;
if (w.dev_most_full_percent < 20 && throttle > 0) {
r->state = REBALANCE_THROTTLED;
r->throttled_until_iotime = io_start +
div_u64(w.dev_most_full_capacity *
(20 - w.dev_most_full_percent),
50);
r->throttled_until_cputime = start + throttle;
bch2_kthread_io_clock_wait(clock,
r->throttled_until_iotime,
throttle);
continue;
if (atomic_long_read(&clock->now) + clock->max_slop <
r->throttled_until_iotime) {
r->throttled_until_cputime = start + throttle;
r->state = REBALANCE_THROTTLED;
bch2_kthread_io_clock_wait(clock,
r->throttled_until_iotime,
throttle);
continue;
}
}
/* minimum 1 mb/sec: */