linux-kernel - [tip:sched/core] sched/fair: Fix scale_rt

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Message-ID: <tip-287cdaac5700c5b8970d739f73d742d863d3e2ca@git.kernel.org>
Date:   Mon, 10 Sep 2018 03:07:48 -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,
        vincent.guittot@...aro.org, srikar@...ux.vnet.ibm.com,
        tglx@...utronix.de, torvalds@...ux-foundation.org, hpa@...or.com,
        peterz@...radead.org
Subject: [tip:sched/core] sched/fair: Fix scale_rt_capacity() for SMT

Commit-ID:  287cdaac5700c5b8970d739f73d742d863d3e2ca
Gitweb:     https://git.kernel.org/tip/287cdaac5700c5b8970d739f73d742d863d3e2ca
Author:     Vincent Guittot <vincent.guittot@...aro.org>
AuthorDate: Tue, 4 Sep 2018 11:36:26 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 10 Sep 2018 10:13:47 +0200

sched/fair: Fix scale_rt_capacity() for SMT

Since commit:

  523e979d3164 ("sched/core: Use PELT for scale_rt_capacity()")

scale_rt_capacity() returns the remaining capacity and not a scale factor
to apply on cpu_capacity_orig. arch_scale_cpu() is directly called by
scale_rt_capacity() so we must take the sched_domain argument.

Reported-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Fixes: 523e979d3164 ("sched/core: Use PELT for scale_rt_capacity()")
Link: http://lkml.kernel.org/r/20180904093626.GA23936@linaro.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index c6b7d6daab20..f12d004be6a1 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7488,10 +7488,10 @@ static inline int get_sd_load_idx(struct sched_domain *sd,
 	return load_idx;
 }
 
-static unsigned long scale_rt_capacity(int cpu)
+static unsigned long scale_rt_capacity(struct sched_domain *sd, int cpu)
 {
 	struct rq *rq = cpu_rq(cpu);
-	unsigned long max = arch_scale_cpu_capacity(NULL, cpu);
+	unsigned long max = arch_scale_cpu_capacity(sd, cpu);
 	unsigned long used, free;
 	unsigned long irq;
 
@@ -7513,7 +7513,7 @@ static unsigned long scale_rt_capacity(int cpu)
 
 static void update_cpu_capacity(struct sched_domain *sd, int cpu)
 {
-	unsigned long capacity = scale_rt_capacity(cpu);
+	unsigned long capacity = scale_rt_capacity(sd, cpu);
 	struct sched_group *sdg = sd->groups;
 
 	cpu_rq(cpu)->cpu_capacity_orig = arch_scale_cpu_capacity(sd, cpu);