From: Alex Shi <alex.shi@linaro.org>
To: mingo@redhat.com, peterz@infradead.org, morten.rasmussen@arm.com
Cc: vincent.guittot@linaro.org, daniel.lezcano@linaro.org,
fweisbec@gmail.com, linux@arm.linux.org.uk, tony.luck@intel.com,
fenghua.yu@intel.com, james.hogan@imgtec.com,
alex.shi@linaro.org, jason.low2@hp.com, viresh.kumar@linaro.org,
hanjun.guo@linaro.org, linux-kernel@vger.kernel.org,
tglx@linutronix.de, akpm@linux-foundation.org,
arjan@linux.intel.com, pjt@google.com, fengguang.wu@intel.com,
linaro-kernel@lists.linaro.org, wangyun@linux.vnet.ibm.com,
mgorman@suse.de
Subject: [PATCH 6/8] sched: rewrite update_cpu_load_nohz
Date: Thu, 13 Mar 2014 13:57:27 +0800 [thread overview]
Message-ID: <1394690249-14130-7-git-send-email-alex.shi@linaro.org> (raw)
In-Reply-To: <1394690249-14130-1-git-send-email-alex.shi@linaro.org>
After change to sched_avg, the cpu load in idle exit was decayed.
So, it maybe near zero if waking a long time sleep task, or, a full
non-decay load if waking a new forked task. Then, we can use it to
reflect the cpu load, don't need to pretend 0.
Signed-off-by: Alex Shi <alex.shi@linaro.org>
---
kernel/sched/proc.c | 19 ++-----------------
1 file changed, 2 insertions(+), 17 deletions(-)
diff --git a/kernel/sched/proc.c b/kernel/sched/proc.c
index 057bb9b..383c4ba 100644
--- a/kernel/sched/proc.c
+++ b/kernel/sched/proc.c
@@ -461,28 +461,13 @@ void update_idle_cpu_load(struct rq *this_rq)
}
/*
- * Called from tick_nohz_idle_exit() -- try and fix up the ticks we missed.
+ * Called from tick_nohz_idle_exit()
*/
void update_cpu_load_nohz(void)
{
struct rq *this_rq = this_rq();
- unsigned long curr_jiffies = ACCESS_ONCE(jiffies);
- unsigned long pending_updates;
-
- if (curr_jiffies == this_rq->last_load_update_tick)
- return;
- raw_spin_lock(&this_rq->lock);
- pending_updates = curr_jiffies - this_rq->last_load_update_tick;
- if (pending_updates) {
- this_rq->last_load_update_tick = curr_jiffies;
- /*
- * 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);
- }
- raw_spin_unlock(&this_rq->lock);
+ update_idle_cpu_load(this_rq);
}
#endif /* CONFIG_NO_HZ */
--
1.8.1.2
next prev parent reply other threads:[~2014-03-13 6:04 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-13 5:57 [ PATCH 0/8] sched: remove cpu_load array Alex Shi
2014-03-13 5:57 ` [PATCH 1/8] sched: shortcut to remove load_idx Alex Shi
2014-03-13 5:57 ` [PATCH 2/8] sched: remove rq->cpu_load[load_idx] array Alex Shi
2014-03-13 5:57 ` [PATCH 3/8] sched: remove source_load and target_load Alex Shi
2014-03-13 5:57 ` [PATCH 4/8] sched: remove LB_BIAS Alex Shi
2014-03-13 5:57 ` [PATCH 5/8] sched: clean up cpu_load update Alex Shi
2014-03-13 5:57 ` Alex Shi [this message]
2014-03-13 5:57 ` [PATCH 7/8] sched: remove rq->cpu_load and rq->nr_load_updates Alex Shi
2014-03-13 5:57 ` [PATCH 8/8] sched: rename update_*_cpu_load Alex Shi
2014-03-17 3:24 ` [ PATCH 0/8] sched: remove cpu_load array Alex Shi
2014-03-18 2:17 ` Alex Shi
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