Since we don't decay the rq->cpu_load, so we don't need the pending_updates. But we still want update rq->rt_avg, so still keep rq->last_load_update_tick and func __update_cpu_load.
After remove the load_idx, in the most of time the source_load is equal to target_load, except only when source cpu is idle. At that time we force set the cpu_load is 0(in update_cpu_load_nohz). So we still left cpu_load in rq.
Signed-off-by: Alex Shi alex.shi@linaro.org --- kernel/sched/proc.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-)
diff --git a/kernel/sched/proc.c b/kernel/sched/proc.c index a2435c5..057bb9b 100644 --- a/kernel/sched/proc.c +++ b/kernel/sched/proc.c @@ -404,8 +404,7 @@ static void calc_load_account_active(struct rq *this_rq) * scheduler tick (TICK_NSEC). With tickless idle this will not be called * every tick. We fix it up based on jiffies. */ -static void __update_cpu_load(struct rq *this_rq, unsigned long this_load, - unsigned long pending_updates) +static void __update_cpu_load(struct rq *this_rq, unsigned long this_load) { this_rq->nr_load_updates++;
@@ -449,7 +448,6 @@ void update_idle_cpu_load(struct rq *this_rq) { unsigned long curr_jiffies = ACCESS_ONCE(jiffies); unsigned long load = get_rq_runnable_load(this_rq); - unsigned long pending_updates;
/* * bail if there's load or we're actually up-to-date. @@ -457,10 +455,9 @@ void update_idle_cpu_load(struct rq *this_rq) if (load || curr_jiffies == this_rq->last_load_update_tick) return;
- pending_updates = curr_jiffies - this_rq->last_load_update_tick; this_rq->last_load_update_tick = curr_jiffies;
- __update_cpu_load(this_rq, load, pending_updates); + __update_cpu_load(this_rq, load); }
/* @@ -483,7 +480,7 @@ void update_cpu_load_nohz(void) * We were idle, this means load 0, the current load might be * !0 due to remote wakeups and the sort. */ - __update_cpu_load(this_rq, 0, pending_updates); + __update_cpu_load(this_rq, 0); } raw_spin_unlock(&this_rq->lock); } @@ -499,7 +496,7 @@ void update_cpu_load_active(struct rq *this_rq) * See the mess around update_idle_cpu_load() / update_cpu_load_nohz(). */ this_rq->last_load_update_tick = jiffies; - __update_cpu_load(this_rq, load, 1); + __update_cpu_load(this_rq, load);
calc_load_account_active(this_rq); }