linux-kernel - [tip:sched/core] sched: Remove frequency scaling from cpu

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Message-ID: <tip-a8faa8f55d48496f64d96df48298e54fd380f6af@git.kernel.org>
Date:	Fri, 27 Mar 2015 04:40:35 -0700
From:	tip-bot for Vincent Guittot <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	peterz@...radead.org, vincent.guittot@...aro.org,
	morten.rasmussen@....com, hpa@...or.com, tglx@...utronix.de
Subject: [tip:sched/core] sched:
  Remove frequency scaling from cpu_capacity

Commit-ID:  a8faa8f55d48496f64d96df48298e54fd380f6af
Gitweb:     http://git.kernel.org/tip/a8faa8f55d48496f64d96df48298e54fd380f6af
Author:     Vincent Guittot <vincent.guittot@...aro.org>
AuthorDate: Fri, 27 Feb 2015 16:54:06 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 27 Mar 2015 09:35:59 +0100

sched: Remove frequency scaling from cpu_capacity

Now that arch_scale_cpu_capacity has been introduced to scale the original
capacity, the arch_scale_freq_capacity is no longer used (it was
previously used by ARM arch).

Remove arch_scale_freq_capacity from the computation of cpu_capacity.
The frequency invariance will be handled in the load tracking and not in
the CPU capacity. arch_scale_freq_capacity will be revisited for scaling
load with the current frequency of the CPUs in a later patch.

Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Morten Rasmussen <morten.rasmussen@....com>
Cc: Morten.Rasmussen@....com
Cc: dietmar.eggemann@....com
Cc: efault@....de
Cc: kamalesh@...ux.vnet.ibm.com
Cc: linaro-kernel@...ts.linaro.org
Cc: nicolas.pitre@...aro.org
Cc: preeti@...ux.vnet.ibm.com
Cc: riel@...hat.com
Link: http://lkml.kernel.org/r/1425052454-25797-4-git-send-email-vincent.guittot@linaro.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index d94a865..e54231f 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6042,13 +6042,6 @@ static void update_cpu_capacity(struct sched_domain *sd, int cpu)
 
 	sdg->sgc->capacity_orig = capacity;
 
-	if (sched_feat(ARCH_CAPACITY))
-		capacity *= arch_scale_freq_capacity(sd, cpu);
-	else
-		capacity *= default_scale_capacity(sd, cpu);
-
-	capacity >>= SCHED_CAPACITY_SHIFT;
-
 	capacity *= scale_rt_capacity(cpu);
 	capacity >>= SCHED_CAPACITY_SHIFT;
 
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