This is a note to let you know that I've just added the patch titled
cpufreq: schedutil: move cached_raw_freq to struct sugov_policy
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
cpufreq-schedutil-move-cached_raw_freq-to-struct-sugov_policy.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6c4f0fa643cb9e775dcc976e3db00d649468ff1d Mon Sep 17 00:00:00 2001
From: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Date: Thu, 2 Mar 2017 14:03:20 +0530
Subject: cpufreq: schedutil: move cached_raw_freq to struct sugov_policy
From: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
commit 6c4f0fa643cb9e775dcc976e3db00d649468ff1d upstream.
cached_raw_freq applies to the entire cpufreq policy and not individual
CPUs. Apart from wasting per-cpu memory, it is actually wrong to keep it
in struct sugov_cpu as we may end up comparing next_freq with a stale
cached_raw_freq of a random CPU.
Move cached_raw_freq to struct sugov_policy.
Fixes: 5cbea46984d6 (cpufreq: schedutil: map raw required frequency to driver frequency)
Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Amit Pundir <amit.pundir@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/sched/cpufreq_schedutil.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/kernel/sched/cpufreq_schedutil.c
+++ b/kernel/sched/cpufreq_schedutil.c
@@ -32,6 +32,7 @@ struct sugov_policy {
u64 last_freq_update_time;
s64 freq_update_delay_ns;
unsigned int next_freq;
+ unsigned int cached_raw_freq;
/* The next fields are only needed if fast switch cannot be used. */
struct irq_work irq_work;
@@ -46,7 +47,6 @@ struct sugov_cpu {
struct update_util_data update_util;
struct sugov_policy *sg_policy;
- unsigned int cached_raw_freq;
unsigned long iowait_boost;
unsigned long iowait_boost_max;
u64 last_update;
@@ -140,9 +140,9 @@ static unsigned int get_next_freq(struct
freq = (freq + (freq >> 2)) * util / max;
- if (freq == sg_cpu->cached_raw_freq && sg_policy->next_freq != UINT_MAX)
+ if (freq == sg_policy->cached_raw_freq && sg_policy->next_freq != UINT_MAX)
return sg_policy->next_freq;
- sg_cpu->cached_raw_freq = freq;
+ sg_policy->cached_raw_freq = freq;
return cpufreq_driver_resolve_freq(policy, freq);
}
@@ -502,6 +502,7 @@ static int sugov_start(struct cpufreq_po
sg_policy->next_freq = UINT_MAX;
sg_policy->work_in_progress = false;
sg_policy->need_freq_update = false;
+ sg_policy->cached_raw_freq = 0;
for_each_cpu(cpu, policy->cpus) {
struct sugov_cpu *sg_cpu = &per_cpu(sugov_cpu, cpu);
@@ -512,7 +513,6 @@ static int sugov_start(struct cpufreq_po
sg_cpu->max = 0;
sg_cpu->flags = SCHED_CPUFREQ_RT;
sg_cpu->last_update = 0;
- sg_cpu->cached_raw_freq = 0;
sg_cpu->iowait_boost = 0;
sg_cpu->iowait_boost_max = policy->cpuinfo.max_freq;
cpufreq_add_update_util_hook(cpu, &sg_cpu->update_util,
Patches currently in stable-queue which might be from viresh.kumar@xxxxxxxxxx are
queue-4.9/cpufreq-schedutil-move-cached_raw_freq-to-struct-sugov_policy.patch
queue-4.9/cpufreq-schedutil-fix-per-cpu-structure-initialization-in-sugov_start.patch
queue-4.9/cpufreq-cpufreq_register_driver-should-return-enodev-if-init-fails.patch