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authorLinus Torvalds <torvalds@linux-foundation.org>2022-11-25 23:43:33 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-11-25 23:43:33 +0300
commit88817acb8b75fe533fb5dfb6234a4e2104465e53 (patch)
tree7ec2051a9889a077d069c0527a53aa0d6ab66ce6 /kernel
parente3ebac80b6e9efe47b0ac3bf4b2d800b0b1958ff (diff)
parent1056d314709d0607a22e589c54b1e47e0da57b9d (diff)
downloadlinux-88817acb8b75fe533fb5dfb6234a4e2104465e53.tar.xz
Merge tag 'pm-6.1-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull power management fixes from Rafael Wysocki: "These revert a recent change in the schedutil cpufreq governor that had not been expected to make any functional difference, but turned out to introduce a performance regression, fix an initialization issue in the amd-pstate driver and make it actually replace the venerable ACPI cpufreq driver on the supported systems by default. Specifics: - Revert a recent schedutil cpufreq governor change that introduced a performace regression on Pixel 6 (Sam Wu) - Fix amd-pstate driver initialization after running the kernel via kexec (Wyes Karny) - Turn amd-pstate into a built-in driver which allows it to take precedence over acpi-cpufreq by default on supported systems and amend it with a mechanism to disable this behavior (Perry Yuan) - Update amd-pstate documentation in accordance with the other changes made to it (Perry Yuan)" * tag 'pm-6.1-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: Documentation: add amd-pstate kernel command line options Documentation: amd-pstate: add driver working mode introduction cpufreq: amd-pstate: add amd-pstate driver parameter for mode selection cpufreq: amd-pstate: change amd-pstate driver to be built-in type cpufreq: amd-pstate: cpufreq: amd-pstate: reset MSR_AMD_PERF_CTL register at init Revert "cpufreq: schedutil: Move max CPU capacity to sugov_policy"
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched/cpufreq_schedutil.c30
1 files changed, 15 insertions, 15 deletions
diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
index 9161d1136d01..1207c78f85c1 100644
--- a/kernel/sched/cpufreq_schedutil.c
+++ b/kernel/sched/cpufreq_schedutil.c
@@ -25,9 +25,6 @@ struct sugov_policy {
unsigned int next_freq;
unsigned int cached_raw_freq;
- /* max CPU capacity, which is equal for all CPUs in freq. domain */
- unsigned long max;
-
/* The next fields are only needed if fast switch cannot be used: */
struct irq_work irq_work;
struct kthread_work work;
@@ -51,6 +48,7 @@ struct sugov_cpu {
unsigned long util;
unsigned long bw_dl;
+ unsigned long max;
/* The field below is for single-CPU policies only: */
#ifdef CONFIG_NO_HZ_COMMON
@@ -160,6 +158,7 @@ static void sugov_get_util(struct sugov_cpu *sg_cpu)
{
struct rq *rq = cpu_rq(sg_cpu->cpu);
+ sg_cpu->max = arch_scale_cpu_capacity(sg_cpu->cpu);
sg_cpu->bw_dl = cpu_bw_dl(rq);
sg_cpu->util = effective_cpu_util(sg_cpu->cpu, cpu_util_cfs(sg_cpu->cpu),
FREQUENCY_UTIL, NULL);
@@ -254,7 +253,6 @@ static void sugov_iowait_boost(struct sugov_cpu *sg_cpu, u64 time,
*/
static void sugov_iowait_apply(struct sugov_cpu *sg_cpu, u64 time)
{
- struct sugov_policy *sg_policy = sg_cpu->sg_policy;
unsigned long boost;
/* No boost currently required */
@@ -282,8 +280,7 @@ static void sugov_iowait_apply(struct sugov_cpu *sg_cpu, u64 time)
* sg_cpu->util is already in capacity scale; convert iowait_boost
* into the same scale so we can compare.
*/
- boost = sg_cpu->iowait_boost * sg_policy->max;
- boost >>= SCHED_CAPACITY_SHIFT;
+ boost = (sg_cpu->iowait_boost * sg_cpu->max) >> SCHED_CAPACITY_SHIFT;
boost = uclamp_rq_util_with(cpu_rq(sg_cpu->cpu), boost, NULL);
if (sg_cpu->util < boost)
sg_cpu->util = boost;
@@ -340,7 +337,7 @@ static void sugov_update_single_freq(struct update_util_data *hook, u64 time,
if (!sugov_update_single_common(sg_cpu, time, flags))
return;
- next_f = get_next_freq(sg_policy, sg_cpu->util, sg_policy->max);
+ next_f = get_next_freq(sg_policy, sg_cpu->util, sg_cpu->max);
/*
* Do not reduce the frequency if the CPU has not been idle
* recently, as the reduction is likely to be premature then.
@@ -376,7 +373,6 @@ static void sugov_update_single_perf(struct update_util_data *hook, u64 time,
unsigned int flags)
{
struct sugov_cpu *sg_cpu = container_of(hook, struct sugov_cpu, update_util);
- struct sugov_policy *sg_policy = sg_cpu->sg_policy;
unsigned long prev_util = sg_cpu->util;
/*
@@ -403,8 +399,7 @@ static void sugov_update_single_perf(struct update_util_data *hook, u64 time,
sg_cpu->util = prev_util;
cpufreq_driver_adjust_perf(sg_cpu->cpu, map_util_perf(sg_cpu->bw_dl),
- map_util_perf(sg_cpu->util),
- sg_policy->max);
+ map_util_perf(sg_cpu->util), sg_cpu->max);
sg_cpu->sg_policy->last_freq_update_time = time;
}
@@ -413,19 +408,25 @@ static unsigned int sugov_next_freq_shared(struct sugov_cpu *sg_cpu, u64 time)
{
struct sugov_policy *sg_policy = sg_cpu->sg_policy;
struct cpufreq_policy *policy = sg_policy->policy;
- unsigned long util = 0;
+ unsigned long util = 0, max = 1;
unsigned int j;
for_each_cpu(j, policy->cpus) {
struct sugov_cpu *j_sg_cpu = &per_cpu(sugov_cpu, j);
+ unsigned long j_util, j_max;
sugov_get_util(j_sg_cpu);
sugov_iowait_apply(j_sg_cpu, time);
+ j_util = j_sg_cpu->util;
+ j_max = j_sg_cpu->max;
- util = max(j_sg_cpu->util, util);
+ if (j_util * max > j_max * util) {
+ util = j_util;
+ max = j_max;
+ }
}
- return get_next_freq(sg_policy, util, sg_policy->max);
+ return get_next_freq(sg_policy, util, max);
}
static void
@@ -751,7 +752,7 @@ static int sugov_start(struct cpufreq_policy *policy)
{
struct sugov_policy *sg_policy = policy->governor_data;
void (*uu)(struct update_util_data *data, u64 time, unsigned int flags);
- unsigned int cpu = cpumask_first(policy->cpus);
+ unsigned int cpu;
sg_policy->freq_update_delay_ns = sg_policy->tunables->rate_limit_us * NSEC_PER_USEC;
sg_policy->last_freq_update_time = 0;
@@ -759,7 +760,6 @@ static int sugov_start(struct cpufreq_policy *policy)
sg_policy->work_in_progress = false;
sg_policy->limits_changed = false;
sg_policy->cached_raw_freq = 0;
- sg_policy->max = arch_scale_cpu_capacity(cpu);
sg_policy->need_freq_update = cpufreq_driver_test_flags(CPUFREQ_NEED_UPDATE_LIMITS);