* [PATCH] sched/rt: Add borrowing time condition
@ 2020-05-20 8:09 qiang.zhang
0 siblings, 0 replies; only message in thread
From: qiang.zhang @ 2020-05-20 8:09 UTC (permalink / raw)
To: mingo, peterz, juri.lelli, vincent.guittot, dietmar.eggemann,
rostedt, bsegall, mgorman
Cc: linux-kernel
From: Zhang Qiang <qiang.zhang@windriver.com>
Add priority judgment to determine whether to borrow time from neighbors,
ensure that the rt_runntime of rt_rq with higher priority tasks is not
reduced
Signed-off-by: Zhang Qiang <qiang.zhang@windriver.com>
---
kernel/sched/rt.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 4043abe45459..d2a1acad6687 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -711,8 +711,10 @@ static void do_balance_runtime(struct rt_rq *rt_rq)
diff = div_u64((u64)diff, weight);
if (rt_rq->rt_runtime + diff > rt_period)
diff = rt_period - rt_rq->rt_runtime;
- iter->rt_runtime -= diff;
- rt_rq->rt_runtime += diff;
+ if (rt_rq->highest_prio.curr < iter->highest_prio.curr) {
+ iter->rt_runtime -= diff;
+ rt_rq->rt_runtime += diff;
+ }
if (rt_rq->rt_runtime == rt_period) {
raw_spin_unlock(&iter->rt_runtime_lock);
break;
--
2.17.0
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