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Subject[RFC PATCH v2 08/11] bfq: disallow idle if CLASS_RT waiting for service
Date
From: Chunguang Xu <brookxu@tencent.com>

if CLASS_RT is waiting for service,queues belong
to other class disallow idle, so that a schedule
can be invoked in time.

Signed-off-by: Chunguang Xu <brookxu@tencent.com>
---
block/bfq-iosched.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index a5f13589df79..9330043cdd53 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -4263,6 +4263,11 @@ static bool bfq_better_to_idle(struct bfq_queue *bfqq)
if (unlikely(bfqd->strict_guarantees))
return true;

+#ifdef CONFIG_BFQ_GROUP_IOSCHED
+ if (!bfq_class_rt(bfqq) && bfqd->busy_groups[0])
+ return false;
+#endif
+
/*
* Idling is performed only if slice_idle > 0. In addition, we
* do not idle if
--
2.30.0
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