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Date: Thu, 4 Sep 2014 20:31:00 +0400
From: klamm@...dex-team.ru
To: peterz@...radead.org, mingo@...hat.com,
linux-kernel@...r.kernel.org
Cc: stfomichev@...dex-team.ru, Roman Gushchin <klamm@...dex-team.ru>
Subject: [PATCH 14/19] smart: smart-related sysctl's
From: Roman Gushchin <klamm@...dex-team.ru>
This patch introduces sysctl interface for smart configuration (default
values are given in brackets):
sched_smart_enable (1) - enable/disable smart globally
sched_smart_prio (10) - rt priority of tasks in a cgroup with smart set
sched_smart_gathering (1) - enable/disable smart gathering
sched_smart_throttle (1) - enable/disable throttling of CFS tasks
Signed-off-by: Roman Gushchin <klamm@...dex-team.ru>
---
kernel/sched/rt.c | 76 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
kernel/sysctl.c | 39 ++++++++++++++++++++++++++++
2 files changed, 115 insertions(+)
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index ff7751a..21ffe09 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -2247,6 +2247,82 @@ void print_rt_stats(struct seq_file *m, int cpu)
#endif /* CONFIG_SCHED_DEBUG */
#ifdef CONFIG_SMART
+int proc_smart_enable(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ int enable = static_key_enabled(&__smart_enabled);
+ int ret;
+
+ build_smart_topology();
+
+ mutex_lock(&smart_mutex);
+
+ if (write && !static_key_false(&__smart_initialized)) {
+ ret = -EBUSY;
+ goto exit;
+ }
+
+ table->data = &enable;
+ ret = proc_dointvec(table, write, buffer, lenp, ppos);
+ if (ret)
+ goto exit;
+
+ if (write) {
+ if (enable && !static_key_enabled(&__smart_enabled)) {
+ static_key_slow_inc(&__smart_enabled);
+ smart_update_globally();
+ }
+
+ if (!enable && static_key_enabled(&__smart_enabled)) {
+ static_key_slow_dec(&__smart_enabled);
+ smart_update_globally();
+ }
+ }
+
+exit:
+ mutex_unlock(&smart_mutex);
+
+ return ret;
+}
+
+int proc_smart_static_key(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct static_key *key;
+ int enable;
+ int ret;
+ static DEFINE_MUTEX(mutex);
+
+ mutex_lock(&mutex);
+
+ key = table->data;
+ enable = static_key_enabled(key);
+
+ if (write && !static_key_false(&__smart_initialized)) {
+ ret = -EBUSY;
+ goto exit;
+ }
+
+ table->data = &enable;
+ ret = proc_dointvec(table, write, buffer, lenp, ppos);
+ if (ret)
+ goto exit;
+
+ if (write) {
+ if (enable && !static_key_enabled(key))
+ static_key_slow_inc(key);
+
+ if (!enable && static_key_enabled(key))
+ static_key_slow_dec(key);
+ }
+
+exit:
+ table->data = key;
+ mutex_unlock(&mutex);
+
+ return ret;
+}
+
int check_smart_data(void)
{
int cpu, core;
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index a1e71e9..27eb548 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -128,6 +128,7 @@ static int __maybe_unused one = 1;
static int __maybe_unused two = 2;
static int __maybe_unused three = 3;
static unsigned long one_ul = 1;
+static int ninety_eight = 98;
static int one_hundred = 100;
#ifdef CONFIG_PRINTK
static int ten_thousand = 10000;
@@ -178,6 +179,13 @@ extern int no_unaligned_warning;
#ifdef CONFIG_SMART
struct static_key smart_cfs_gather = STATIC_KEY_INIT_TRUE;
struct static_key smart_cfs_throttle = STATIC_KEY_INIT_TRUE;
+
+extern int sched_smart_prio;
+
+int proc_smart_static_key(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos);
+int proc_smart_enable(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos);
#endif
#ifdef CONFIG_PROC_SYSCTL
@@ -446,6 +454,37 @@ static struct ctl_table kern_table[] = {
.extra1 = &one,
},
#endif
+#ifdef CONFIG_SMART
+ {
+ .procname = "sched_smart_enable",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_smart_enable,
+ },
+ {
+ .procname = "sched_smart_prio",
+ .data = &sched_smart_prio,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &one,
+ .extra2 = &ninety_eight,
+ },
+ {
+ .procname = "sched_smart_gathering",
+ .data = &smart_cfs_gather,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_smart_static_key,
+ },
+ {
+ .procname = "sched_smart_throttle",
+ .data = &smart_cfs_throttle,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_smart_static_key,
+ },
+#endif
#ifdef CONFIG_PROVE_LOCKING
{
.procname = "prove_locking",
--
1.9.3
--
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