From 6cb58195143b55d4c427d92f8425bec2b0d9c56c Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Mon, 15 Oct 2007 17:00:04 +0200
Subject: [PATCH] sched: optimize vruntime based scheduling
optimize vruntime based scheduling.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
---
kernel/sched.c | 5 +++--
kernel/sched_fair.c | 3 +++
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c
index a5dd03522e32..5594e65166fc 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -732,13 +732,14 @@ calc_delta_fair(unsigned long delta_exec, struct load_weight *lw)
static inline void update_load_add(struct load_weight *lw, unsigned long inc)
{
lw->weight += inc;
- lw->inv_weight = WMULT_CONST / lw->weight;
+ if (sched_feat(FAIR_SLEEPERS))
+ lw->inv_weight = WMULT_CONST / lw->weight;
}
static inline void update_load_sub(struct load_weight *lw, unsigned long dec)
{
lw->weight -= dec;
- if (likely(lw->weight))
+ if (sched_feat(FAIR_SLEEPERS) && likely(lw->weight))
lw->inv_weight = WMULT_CONST / lw->weight;
}
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index a566a4558167..7041dc697855 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -336,6 +336,9 @@ __update_curr(struct cfs_rq *cfs_rq, struct sched_entity *curr,
}
curr->vruntime += delta_exec_weighted;
+ if (!sched_feat(FAIR_SLEEPERS))
+ return;
+
if (unlikely(!load))
return;
--
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