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Date: Tue, 18 Jun 2013 12:56:08 +0800
From: Alex Shi <alex.shi@...el.com>
To: Alex Shi <alex.shi@...el.com>
CC: mingo@...hat.com, peterz@...radead.org, tglx@...utronix.de,
akpm@...ux-foundation.org, bp@...en8.de, pjt@...gle.com,
namhyung@...nel.org, efault@....de, morten.rasmussen@....com,
vincent.guittot@...aro.org, preeti@...ux.vnet.ibm.com,
viresh.kumar@...aro.org, linux-kernel@...r.kernel.org,
mgorman@...e.de, riel@...hat.com, wangyun@...ux.vnet.ibm.com,
Jason Low <jason.low2@...com>
Subject: Re: [RFC patch 1/4] sched: change cfs_rq load avg to unsigned long
On 06/07/2013 03:29 PM, Alex Shi wrote:
> Since the 'u64 runnable_load_avg, blocked_load_avg' in cfs_rq struct are
> smaller than 'unsigned long' cfs_rq->load.weight. We don't need u64
> vaiables to describe them. unsigned long is more efficient and convenience.
>
update with a a bit clean up in tg_load_down()
---
>From e78ccc55dff1a5ef406a100f6453d0b8c86ca310 Mon Sep 17 00:00:00 2001
From: Alex Shi <alex.shi@...el.com>
Date: Thu, 6 Jun 2013 20:12:36 +0800
Subject: [PATCH 1/5] sched: change cfs_rq load avg to unsigned long
Since the 'u64 runnable_load_avg, blocked_load_avg' in cfs_rq struct are
smaller than 'unsigned long' cfs_rq->load.weight. We don't need u64
variables to describe them. unsigned long is more efficient and convenience.
Signed-off-by: Alex Shi <alex.shi@...el.com>
Reviewed-by: Paul Turner <pjt@...gle.com>
Tested-by: Vincent Guittot <vincent.guittot@...aro.org>
---
kernel/sched/debug.c | 4 ++--
kernel/sched/fair.c | 7 ++-----
kernel/sched/sched.h | 2 +-
3 files changed, 5 insertions(+), 8 deletions(-)
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 75024a6..160afdc 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -211,9 +211,9 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight);
#ifdef CONFIG_FAIR_GROUP_SCHED
#ifdef CONFIG_SMP
- SEQ_printf(m, " .%-30s: %lld\n", "runnable_load_avg",
+ SEQ_printf(m, " .%-30s: %ld\n", "runnable_load_avg",
cfs_rq->runnable_load_avg);
- SEQ_printf(m, " .%-30s: %lld\n", "blocked_load_avg",
+ SEQ_printf(m, " .%-30s: %ld\n", "blocked_load_avg",
cfs_rq->blocked_load_avg);
SEQ_printf(m, " .%-30s: %lld\n", "tg_load_avg",
(unsigned long long)atomic64_read(&cfs_rq->tg->load_avg));
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 395f57c..39a5bae 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4186,12 +4186,9 @@ static int tg_load_down(struct task_group *tg, void *data)
if (!tg->parent) {
load = cpu_rq(cpu)->avg.load_avg_contrib;
} else {
- unsigned long tmp_rla;
- tmp_rla = tg->parent->cfs_rq[cpu]->runnable_load_avg + 1;
-
load = tg->parent->cfs_rq[cpu]->h_load;
- load *= tg->se[cpu]->avg.load_avg_contrib;
- load /= tmp_rla;
+ load = div64_ul(load * tg->se[cpu]->avg.load_avg_contrib,
+ tg->parent->cfs_rq[cpu]->runnable_load_avg + 1);
}
tg->cfs_rq[cpu]->h_load = load;
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 0684c26..762fa63 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -277,7 +277,7 @@ struct cfs_rq {
* This allows for the description of both thread and group usage (in
* the FAIR_GROUP_SCHED case).
*/
- u64 runnable_load_avg, blocked_load_avg;
+ unsigned long runnable_load_avg, blocked_load_avg;
atomic64_t decay_counter, removed_load;
u64 last_decay;
--
1.7.12
--
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