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-rw-r--r--block/blk-throttle.c19
1 files changed, 18 insertions, 1 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index d00c1c1..014b2e9 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -149,6 +149,8 @@ struct throtl_grp {
unsigned long last_check_time;
+ unsigned long last_dispatch_time[2];
+
/* When did we start a new slice */
unsigned long slice_start[2];
unsigned long slice_end[2];
@@ -445,11 +447,14 @@ static void tg_update_has_rules(struct throtl_grp *tg)
static void throtl_pd_online(struct blkg_policy_data *pd)
{
+ struct throtl_grp *tg = pd_to_tg(pd);
/*
* We don't want new groups to escape the limits of its ancestors.
* Update has_rules[] after a new group is brought online.
*/
- tg_update_has_rules(pd_to_tg(pd));
+ tg_update_has_rules(tg);
+ tg->last_dispatch_time[READ] = jiffies;
+ tg->last_dispatch_time[WRITE] = jiffies;
}
static void blk_throtl_update_limit_valid(struct throtl_data *td)
@@ -1615,6 +1620,12 @@ static bool throtl_tg_can_upgrade(struct throtl_grp *tg)
if (write_limit && sq->nr_queued[WRITE] &&
(!read_limit || sq->nr_queued[READ]))
return true;
+
+ if (time_after_eq(jiffies,
+ tg->last_dispatch_time[READ] + tg->td->throtl_slice) &&
+ time_after_eq(jiffies,
+ tg->last_dispatch_time[WRITE] + tg->td->throtl_slice))
+ return true;
return false;
}
@@ -1692,6 +1703,11 @@ static bool throtl_tg_can_downgrade(struct throtl_grp *tg)
struct throtl_data *td = tg->td;
unsigned long now = jiffies;
+ if (time_after_eq(now, tg->last_dispatch_time[READ] +
+ td->throtl_slice) &&
+ time_after_eq(now, tg->last_dispatch_time[WRITE] +
+ td->throtl_slice))
+ return false;
/*
* If cgroup is below low limit, consider downgrade and throttle other
* cgroups
@@ -1800,6 +1816,7 @@ bool blk_throtl_bio(struct request_queue *q, struct blkcg_gq *blkg,
again:
while (true) {
+ tg->last_dispatch_time[rw] = jiffies;
if (tg->last_low_overflow_time[rw] == 0)
tg->last_low_overflow_time[rw] = jiffies;
throtl_downgrade_check(tg);