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| author | Lars Ellenberg <lars.ellenberg@linbit.com> | 2013-12-20 11:22:13 +0100 |
|---|---|---|
| committer | Philipp Reisner <philipp.reisner@linbit.com> | 2014-07-10 18:35:13 +0200 |
| commit | ad3fee790088d36ad862e31535b5b99c25adeef4 (patch) | |
| tree | 916a5c23cf57283f9f6a5abf8418364c52249ad9 /drivers/block/drbd/drbd_proc.c | |
| parent | drbd: add caching oldest request pointers for replication stages (diff) | |
| download | linux-ad3fee790088d36ad862e31535b5b99c25adeef4.tar.xz linux-ad3fee790088d36ad862e31535b5b99c25adeef4.zip | |
drbd: improve throttling decisions of background resynchronisation
Background resynchronisation does some "side-stepping", or throttles
itself, if it detects application IO activity, and the current resync
rate estimate is above the configured "cmin-rate".
What was not detected: if there is no application IO,
because it blocks on activity log transactions.
Introduce a new atomic_t ap_actlog_cnt, tracking such blocked requests,
and count non-zero as application IO activity.
This counter is exposed at proc_details level 2 and above.
Also make sure to release the currently locked resync extent
if we side-step due to such voluntary throttling.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Diffstat (limited to 'drivers/block/drbd/drbd_proc.c')
| -rw-r--r-- | drivers/block/drbd/drbd_proc.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/block/drbd/drbd_proc.c b/drivers/block/drbd/drbd_proc.c index 9059d7bf8a36..06e6147c7601 100644 --- a/drivers/block/drbd/drbd_proc.c +++ b/drivers/block/drbd/drbd_proc.c @@ -335,6 +335,9 @@ static int drbd_seq_show(struct seq_file *seq, void *v) lc_seq_printf_stats(seq, device->act_log); put_ldev(device); } + + if (proc_details >= 2) + seq_printf(seq, "\tblocked on activity log: %d\n", atomic_read(&device->ap_actlog_cnt)); } rcu_read_unlock(); |