From: "Zou, Nanhai" <nanhai.zou@intel.com>
I think add sysctl interface to sched_domain parameters is helpful to debug
and tuning those parameters at run time.
Signed-off-by: Zou Nan hai <nanhai.zou@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
25-akpm/kernel/sched.c | 125 +++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 125 insertions(+)
diff -puN kernel/sched.c~add-sysctl-interface-to-sched_domain-parameters kernel/sched.c
--- 25/kernel/sched.c~add-sysctl-interface-to-sched_domain-parameters 2005-02-24 21:08:44.000000000 -0800
+++ 25-akpm/kernel/sched.c 2005-02-24 21:08:44.000000000 -0800
@@ -44,6 +44,7 @@
#include <linux/perfctr.h>
#include <linux/kthread.h>
#include <linux/seq_file.h>
+#include <linux/sysctl.h>
#include <linux/syscalls.h>
#include <linux/times.h>
#include <linux/acct.h>
@@ -4623,6 +4624,129 @@ static void sched_domain_debug(struct sc
#define sched_domain_debug(sd, cpu) {}
#endif
+#if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_SYSCTL)
+static struct ctl_table sd_ctl_dir[] = {
+ {1, "sched_domain", NULL, 0, 0755, NULL, },
+ {0,},
+};
+
+static struct ctl_table sd_ctl_root[] = {
+ {1, "kernel", NULL, 0, 0755, sd_ctl_dir, },
+ {0,},
+};
+
+static char *sched_strdup(char *str)
+{
+ int n = strlen(str)+1;
+ char *s = kmalloc(n, GFP_KERNEL);
+ if (!s)
+ return NULL;
+ return strcpy(s, str);
+}
+
+static struct ctl_table *sd_alloc_ctl_entry(int n)
+{
+ struct ctl_table *entry =
+ kmalloc(n * sizeof(struct ctl_table), GFP_KERNEL);
+ BUG_ON(!entry);
+ memset(entry, 0, n * sizeof(struct ctl_table));
+ return entry;
+}
+
+static void set_table_entry(struct ctl_table *entry, int ctl_name,
+ const char *procname, void *data, int maxlen,
+ mode_t mode, proc_handler *proc_handler)
+{
+ entry->ctl_name = ctl_name;
+ entry->procname = procname;
+ entry->data = data;
+ entry->maxlen = maxlen;
+ entry->mode = mode;
+ entry->proc_handler = proc_handler;
+}
+
+static struct ctl_table *
+sd_alloc_ctl_domain_table(struct sched_domain *sd)
+{
+ struct ctl_table *table;
+ table = sd_alloc_ctl_entry(14);
+
+ set_table_entry(&table[0], 1, "min_interval", &sd->min_interval,
+ sizeof(long), 0644, proc_doulongvec_minmax);
+ set_table_entry(&table[1], 2, "max_interval", &sd->max_interval,
+ sizeof(long), 0644, proc_doulongvec_minmax);
+ set_table_entry(&table[2], 3, "busy_idx", &sd->busy_idx,
+ sizeof(int), 0644, proc_dointvec_minmax);
+ set_table_entry(&table[3], 4, "idle_idx", &sd->idle_idx,
+ sizeof(int), 0644, proc_dointvec_minmax);
+ set_table_entry(&table[4], 5, "newidle_idx", &sd->newidle_idx,
+ sizeof(int), 0644, proc_dointvec_minmax);
+ set_table_entry(&table[5], 6, "wake_idx", &sd->wake_idx,
+ sizeof(int), 0644, proc_dointvec_minmax);
+ set_table_entry(&table[6], 7, "forkexec_idx", &sd->forkexec_idx,
+ sizeof(int), 0644, proc_dointvec_minmax);
+ set_table_entry(&table[7], 8, "busy_factor", &sd->busy_factor,
+ sizeof(int), 0644, proc_dointvec_minmax);
+ set_table_entry(&table[8], 9, "imbalance_pct", &sd->imbalance_pct,
+ sizeof(int), 0644, proc_dointvec_minmax);
+ set_table_entry(&table[9], 10, "cache_hot_time", &sd->cache_hot_time,
+ sizeof(long long), 0644, proc_doulongvec_minmax);
+ set_table_entry(&table[10], 11, "cache_nice_tries", &sd->cache_nice_tries,
+ sizeof(int), 0644, proc_dointvec_minmax);
+ set_table_entry(&table[11], 12, "per_cpu_gain", &sd->per_cpu_gain,
+ sizeof(int), 0644, proc_dointvec_minmax);
+ set_table_entry(&table[12], 13, "flags", &sd->flags,
+ sizeof(int), 0644, proc_dointvec_minmax);
+ return table;
+}
+
+static ctl_table *sd_alloc_ctl_cpu_table(int cpu)
+{
+ struct sched_domain *sd;
+ int domain_num = 0, i;
+ struct ctl_table *entry, *table;
+ char buf[32];
+ for_each_domain(cpu, sd)
+ domain_num++;
+ entry = table = sd_alloc_ctl_entry(domain_num + 1);
+
+ i = 0;
+ for_each_domain(cpu, sd) {
+ snprintf(buf, 32, "domain%d", i);
+ entry->ctl_name = i + 1;
+ entry->procname = sched_strdup(buf);
+ entry->mode = 0755;
+ entry->child = sd_alloc_ctl_domain_table(sd);
+ entry++;
+ i++;
+ }
+ return table;
+}
+
+static struct ctl_table_header *sd_sysctl_header;
+static void init_sched_domain_sysctl(void)
+{
+ int i, cpu_num = num_online_cpus();
+ char buf[32];
+ struct ctl_table *entry = sd_alloc_ctl_entry(cpu_num + 1);
+
+ sd_ctl_dir[0].child = entry;
+
+ for (i = 0; i < cpu_num; i++, entry++) {
+ snprintf(buf, 32, "cpu%d", i);
+ entry->ctl_name = i + 1;
+ entry->procname = sched_strdup(buf);
+ entry->mode = 0755;
+ entry->child = sd_alloc_ctl_cpu_table(i);
+ }
+ sd_sysctl_header = register_sysctl_table(sd_ctl_root, 0);
+}
+#else
+static void init_sched_domain_sysctl()
+{
+}
+#endif
+
/*
* Attach the domain 'sd' to 'cpu' as its base domain. Callers must
* hold the hotplug lock.
@@ -4964,6 +5088,7 @@ void __init sched_init_smp(void)
unlock_cpu_hotplug();
/* XXX: Theoretical race here - CPU may be hotplugged now */
hotcpu_notifier(update_sched_domains, 0);
+ init_sched_domain_sysctl();
}
#else
void __init sched_init_smp(void)
_