Messages in this thread Patch in this message | | | From | Frederic Weisbecker <> | Subject | [RFC PATCH 2/4] sched: Consolidate nohz cpu load prelude code | Date | Thu, 20 Jun 2013 22:45:39 +0200 |
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Gather the common code that computes the pending idle cpu load to decay.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Li Zhong <zhong@linux.vnet.ibm.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Alex Shi <alex.shi@intel.com> Cc: Paul Turner <pjt@google.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Vincent Guittot <vincent.guittot@linaro.org> --- kernel/sched/proc.c | 40 ++++++++++++++-------------------------- 1 files changed, 14 insertions(+), 26 deletions(-)
diff --git a/kernel/sched/proc.c b/kernel/sched/proc.c index bb3a6a0..030528a 100644 --- a/kernel/sched/proc.c +++ b/kernel/sched/proc.c @@ -470,11 +470,14 @@ decay_load_missed(unsigned long load, unsigned long missed_updates, int idx) * 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) { + unsigned long curr_jiffies = ACCESS_ONCE(jiffies); + unsigned long pending_updates; int i, scale; + pending_updates = curr_jiffies - this_rq->last_load_update_tick; + this_rq->last_load_update_tick = curr_jiffies; this_rq->nr_load_updates++; /* Update our load: */ @@ -521,20 +524,15 @@ static void __update_cpu_load(struct rq *this_rq, unsigned long this_load, */ void update_idle_cpu_load(struct rq *this_rq) { - unsigned long curr_jiffies = ACCESS_ONCE(jiffies); unsigned long load = this_rq->load.weight; - unsigned long pending_updates; /* * bail if there's load or we're actually up-to-date. */ - if (load || curr_jiffies == this_rq->last_load_update_tick) + if (load || 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); } /* @@ -543,22 +541,16 @@ void update_idle_cpu_load(struct rq *this_rq) 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) + if (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, pending_updates); - } + /* + * 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); } #endif /* CONFIG_NO_HZ */ @@ -568,11 +560,7 @@ void update_cpu_load_nohz(void) */ 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, this_rq->load.weight, 1); + __update_cpu_load(this_rq, this_rq->load.weight); calc_load_account_active(this_rq); } -- 1.7.5.4
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