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@linux.vnet.ibm.com>
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.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@kernel.org>

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index c6b7d6d..f12d004 100644 (file)
--- 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);