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-rw-r--r--block/blk-throttle.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 7878ec1ed5e8..2073b4839ba5 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -590,6 +590,17 @@ static void throtl_dequeue_tg(struct throtl_grp *tg)
static void throtl_schedule_pending_timer(struct throtl_service_queue *sq,
unsigned long expires)
{
+ unsigned long max_expire = jiffies + 8 * throtl_slice;
+
+ /*
+ * Since we are adjusting the throttle limit dynamically, the sleep
+ * time calculated according to previous limit might be invalid. It's
+ * possible the cgroup sleep time is very long and no other cgroups
+ * have IO running so notify the limit changes. Make sure the cgroup
+ * doesn't sleep too long to avoid the missed notification.
+ */
+ if (time_after(expires, max_expire))
+ expires = max_expire;
mod_timer(&sq->pending_timer, expires);
throtl_log(sq, "schedule timer. delay=%lu jiffies=%lu",
expires - jiffies, jiffies);
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