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Message-ID: <51CA76A3.3050207@intel.com>
Date: Wed, 26 Jun 2013 13:05:39 +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, arjan@...ux.intel.com, bp@...en8.de,
pjt@...gle.com, namhyung@...nel.org, efault@....de,
morten.rasmussen@....com, vincent.guittot@...aro.org,
gregkh@...uxfoundation.org, preeti@...ux.vnet.ibm.com,
viresh.kumar@...aro.org, linux-kernel@...r.kernel.org,
len.brown@...el.com, rafael.j.wysocki@...el.com, jkosina@...e.cz,
clark.williams@...il.com, tony.luck@...el.com,
keescook@...omium.org, mgorman@...e.de, riel@...hat.com
Subject: Re: [Resend patch v8 01/13] Revert "sched: Introduce temporary FAIR_GROUP_SCHED
dependency for load-tracking"
On 06/20/2013 10:18 AM, Alex Shi wrote:
> Remove CONFIG_FAIR_GROUP_SCHED that covers the runnable info, then
> we can use runnable load variables.
>
> Signed-off-by: Alex Shi <alex.shi@...el.com>
There are 2 more place need to be reverted too, and merged them into the updated patch.
BTW, this patchset was tested by Fengguang's 0day kbuild system.
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index f404468..1a14209 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5858,7 +5858,7 @@ static void switched_from_fair(struct rq *rq, struct task_struct *p)
se->vruntime -= cfs_rq->min_vruntime;
}
-#if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
+#ifdef CONFIG_SMP
/*
* Remove our load from contribution when we leave sched_fair
* and ensure we don't carry in an old decay_count if we
@@ -5917,7 +5917,7 @@ void init_cfs_rq(struct cfs_rq *cfs_rq)
#ifndef CONFIG_64BIT
cfs_rq->min_vruntime_copy = cfs_rq->min_vruntime;
#endif
-#if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
+#ifdef CONFIG_SMP
atomic64_set(&cfs_rq->decay_counter, 1);
atomic64_set(&cfs_rq->removed_load, 0);
#endif
--
---
>From 190a4d0c8fd6325c6141a9d1ae14518e521e4289 Mon Sep 17 00:00:00 2001
From: Alex Shi <alex.shi@...el.com>
Date: Sun, 3 Mar 2013 16:04:36 +0800
Subject: Revert "sched: Introduce temporary FAIR_GROUP_SCHED
dependency for load-tracking"
Remove CONFIG_FAIR_GROUP_SCHED that covers the runnable info, then
we can use runnable load variables.
Also remove 2 CONFIG_FAIR_GROUP_SCHED setting which is not in reverted
patch(introduced in 9ee474f), but also need to revert.
Signed-off-by: Alex Shi <alex.shi@...el.com>
---
include/linux/sched.h | 7 +------
kernel/sched/core.c | 7 +------
kernel/sched/fair.c | 17 ++++-------------
kernel/sched/sched.h | 10 ++--------
4 files changed, 8 insertions(+), 33 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 178a8d9..0019bef 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -994,12 +994,7 @@ struct sched_entity {
struct cfs_rq *my_q;
#endif
-/*
- * Load-tracking only depends on SMP, FAIR_GROUP_SCHED dependency below may be
- * removed when useful for applications beyond shares distribution (e.g.
- * load-balance).
- */
-#if defined(CONFIG_SMP) && defined(CONFIG_FAIR_GROUP_SCHED)
+#ifdef CONFIG_SMP
/* Per-entity load-tracking */
struct sched_avg avg;
#endif
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 36f85be..b9e7036 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1598,12 +1598,7 @@ static void __sched_fork(struct task_struct *p)
p->se.vruntime = 0;
INIT_LIST_HEAD(&p->se.group_node);
-/*
- * Load-tracking only depends on SMP, FAIR_GROUP_SCHED dependency below may be
- * removed when useful for applications beyond shares distribution (e.g.
- * load-balance).
- */
-#if defined(CONFIG_SMP) && defined(CONFIG_FAIR_GROUP_SCHED)
+#ifdef CONFIG_SMP
p->se.avg.runnable_avg_period = 0;
p->se.avg.runnable_avg_sum = 0;
#endif
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 3ee1c2e..1a14209 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1128,8 +1128,7 @@ static inline void update_cfs_shares(struct cfs_rq *cfs_rq)
}
#endif /* CONFIG_FAIR_GROUP_SCHED */
-/* Only depends on SMP, FAIR_GROUP_SCHED may be removed when useful in lb */
-#if defined(CONFIG_SMP) && defined(CONFIG_FAIR_GROUP_SCHED)
+#ifdef CONFIG_SMP
/*
* We choose a half-life close to 1 scheduling period.
* Note: The tables below are dependent on this value.
@@ -3436,12 +3435,6 @@ unlock:
}
/*
- * Load-tracking only depends on SMP, FAIR_GROUP_SCHED dependency below may be
- * removed when useful for applications beyond shares distribution (e.g.
- * load-balance).
- */
-#ifdef CONFIG_FAIR_GROUP_SCHED
-/*
* Called immediately before a task is migrated to a new cpu; task_cpu(p) and
* cfs_rq_of(p) references at time of call are still valid and identify the
* previous cpu. However, the caller only guarantees p->pi_lock is held; no
@@ -3464,7 +3457,6 @@ migrate_task_rq_fair(struct task_struct *p, int next_cpu)
atomic64_add(se->avg.load_avg_contrib, &cfs_rq->removed_load);
}
}
-#endif
#endif /* CONFIG_SMP */
static unsigned long
@@ -5866,7 +5858,7 @@ static void switched_from_fair(struct rq *rq, struct task_struct *p)
se->vruntime -= cfs_rq->min_vruntime;
}
-#if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
+#ifdef CONFIG_SMP
/*
* Remove our load from contribution when we leave sched_fair
* and ensure we don't carry in an old decay_count if we
@@ -5925,7 +5917,7 @@ void init_cfs_rq(struct cfs_rq *cfs_rq)
#ifndef CONFIG_64BIT
cfs_rq->min_vruntime_copy = cfs_rq->min_vruntime;
#endif
-#if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
+#ifdef CONFIG_SMP
atomic64_set(&cfs_rq->decay_counter, 1);
atomic64_set(&cfs_rq->removed_load, 0);
#endif
@@ -6167,9 +6159,8 @@ const struct sched_class fair_sched_class = {
#ifdef CONFIG_SMP
.select_task_rq = select_task_rq_fair,
-#ifdef CONFIG_FAIR_GROUP_SCHED
.migrate_task_rq = migrate_task_rq_fair,
-#endif
+
.rq_online = rq_online_fair,
.rq_offline = rq_offline_fair,
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 74ff659..d892a9f 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -269,12 +269,6 @@ struct cfs_rq {
#endif
#ifdef CONFIG_SMP
-/*
- * Load-tracking only depends on SMP, FAIR_GROUP_SCHED dependency below may be
- * removed when useful for applications beyond shares distribution (e.g.
- * load-balance).
- */
-#ifdef CONFIG_FAIR_GROUP_SCHED
/*
* CFS Load tracking
* Under CFS, load is tracked on a per-entity basis and aggregated up.
@@ -284,9 +278,9 @@ struct cfs_rq {
u64 runnable_load_avg, blocked_load_avg;
atomic64_t decay_counter, removed_load;
u64 last_decay;
-#endif /* CONFIG_FAIR_GROUP_SCHED */
-/* These always depend on CONFIG_FAIR_GROUP_SCHED */
+
#ifdef CONFIG_FAIR_GROUP_SCHED
+ /* Required to track per-cpu representation of a task_group */
u32 tg_runnable_contrib;
u64 tg_load_contrib;
#endif /* CONFIG_FAIR_GROUP_SCHED */
--
1.7.12
--
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