Konstantin Demin
8cbaf1dea2
3rd patchs (in alphabetical order): - bbr3 - ntsync5 - openwrt - pf-kernel - xanmod - zen no configuration changes for now
107 lines
3.0 KiB
Diff
107 lines
3.0 KiB
Diff
From 33f05bd16a4ac2f6f36c9eb88016e2375dcb597c Mon Sep 17 00:00:00 2001
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From: Christian Loehle <christian.loehle@arm.com>
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Date: Thu, 5 Sep 2024 10:26:41 +0100
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Subject: TEST: cpufreq/schedutil: iowait boost cap sysfs
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Add a knob to cap applied iowait_boost per sysfs.
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This is to test for potential regressions.
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Signed-off-by: Christian Loehle <christian.loehle@arm.com>
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---
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kernel/sched/cpufreq_schedutil.c | 38 ++++++++++++++++++++++++++++++++
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1 file changed, 38 insertions(+)
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--- a/kernel/sched/cpufreq_schedutil.c
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+++ b/kernel/sched/cpufreq_schedutil.c
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@@ -11,6 +11,7 @@
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struct sugov_tunables {
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struct gov_attr_set attr_set;
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unsigned int rate_limit_us;
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+ unsigned int iowait_boost_cap;
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};
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struct sugov_policy {
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@@ -35,6 +36,8 @@ struct sugov_policy {
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bool limits_changed;
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bool need_freq_update;
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+
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+ unsigned int iowait_boost_cap;
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};
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struct sugov_cpu {
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@@ -316,6 +319,9 @@ static unsigned long sugov_iowait_apply(
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sg_cpu->iowait_boost_pending = false;
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+ if (sg_cpu->iowait_boost > sg_cpu->sg_policy->iowait_boost_cap)
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+ sg_cpu->iowait_boost = sg_cpu->sg_policy->iowait_boost_cap;
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+
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/*
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* sg_cpu->util is already in capacity scale; convert iowait_boost
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* into the same scale so we can compare.
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@@ -554,6 +560,14 @@ static ssize_t rate_limit_us_show(struct
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return sprintf(buf, "%u\n", tunables->rate_limit_us);
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}
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+
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+static ssize_t iowait_boost_cap_show(struct gov_attr_set *attr_set, char *buf)
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+{
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+ struct sugov_tunables *tunables = to_sugov_tunables(attr_set);
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+
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+ return sprintf(buf, "%u\n", tunables->iowait_boost_cap);
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+}
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+
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static ssize_t
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rate_limit_us_store(struct gov_attr_set *attr_set, const char *buf, size_t count)
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{
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@@ -572,10 +586,30 @@ rate_limit_us_store(struct gov_attr_set
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return count;
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}
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+static ssize_t
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+iowait_boost_cap_store(struct gov_attr_set *attr_set, const char *buf, size_t count)
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+{
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+ struct sugov_tunables *tunables = to_sugov_tunables(attr_set);
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+ struct sugov_policy *sg_policy;
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+ unsigned int iowait_boost_cap;
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+
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+ if (kstrtouint(buf, 10, &iowait_boost_cap))
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+ return -EINVAL;
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+
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+ tunables->iowait_boost_cap = iowait_boost_cap;
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+
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+ list_for_each_entry(sg_policy, &attr_set->policy_list, tunables_hook)
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+ sg_policy->iowait_boost_cap = iowait_boost_cap;
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+
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+ return count;
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+}
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+
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static struct governor_attr rate_limit_us = __ATTR_RW(rate_limit_us);
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+static struct governor_attr iowait_boost_cap = __ATTR_RW(iowait_boost_cap);
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static struct attribute *sugov_attrs[] = {
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&rate_limit_us.attr,
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+ &iowait_boost_cap.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(sugov);
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@@ -765,6 +799,8 @@ static int sugov_init(struct cpufreq_pol
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tunables->rate_limit_us = cpufreq_policy_transition_delay_us(policy);
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+ tunables->iowait_boost_cap = SCHED_CAPACITY_SCALE;
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+
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policy->governor_data = sg_policy;
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sg_policy->tunables = tunables;
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@@ -834,6 +870,8 @@ static int sugov_start(struct cpufreq_po
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sg_policy->limits_changed = false;
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sg_policy->cached_raw_freq = 0;
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+ sg_policy->iowait_boost_cap = SCHED_CAPACITY_SCALE;
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+
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sg_policy->need_freq_update = cpufreq_driver_test_flags(CPUFREQ_NEED_UPDATE_LIMITS);
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if (policy_is_shared(policy))
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