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sched: WALT: fix broken cumulative runnable average accounting

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When running tasks's ravg.demand is changed update_history() adjusts
rq->cumulative_runnable_avg to reflect change of CPU load.  Currently
this fixup is broken by accumulating task's new demand without
subtracting the task's old demand.

Fix the fixup logic to subtract the task's old demand.

Change-Id: I61beb32a4850879ccb39b733f5564251e465bfeb
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
This commit is contained in:
Joonwoo Park
2017-05-26 11:19:36 -07:00
committed by Amit Pundir
parent 4771c96d16
commit 1eca70e4c4
1 changed files with 3 additions and 1 deletions
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4
kernel/sched/walt.c
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@@ -111,8 +111,10 @@ walt_dec_cumulative_runnable_avg(struct rq *rq,
static void
fixup_cumulative_runnable_avg(struct rq *rq,
struct task_struct *p, s64 task_load_delta)
struct task_struct *p, u64 new_task_load)
{
s64 task_load_delta = (s64)new_task_load - task_load(p);
rq->cumulative_runnable_avg += task_load_delta;
if ((s64)rq->cumulative_runnable_avg < 0)
panic("cra less than zero: tld: %lld, task_load(p) = %u\n",