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[PATCH] sched: debug feature - make the sched-domains tree runtime-tweakable

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debugging feature: make the sched-domains tree runtime-tweakable.

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
[ mingo@elte.hu: made it depend on CONFIG_SCHED_DEBUG & small updates ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Nick Piggin 2007-07-26 13:40:43 +02:00 committed by Ingo Molnar
parent d02c7a8cf2
commit e692ab5347
1 changed files with 122 additions and 0 deletions
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122
kernel/sched.c
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@ -53,6 +53,7 @@
#include <linux/percpu.h>
#include <linux/kthread.h>
#include <linux/seq_file.h>
#include <linux/sysctl.h>
#include <linux/syscalls.h>
#include <linux/times.h>
#include <linux/tsacct_kern.h>
@ -5202,10 +5203,129 @@ static void migrate_dead_tasks(unsigned int dead_cpu)
if (!next)
break;
migrate_dead(dead_cpu, next);
}
}
#endif /* CONFIG_HOTPLUG_CPU */
#if defined(CONFIG_SCHED_DEBUG) && defined(CONFIG_SYSCTL)
static struct ctl_table sd_ctl_dir[] = {
{CTL_UNNUMBERED, "sched_domain", NULL, 0, 0755, NULL, },
{0,},
};
static struct ctl_table sd_ctl_root[] = {
{CTL_UNNUMBERED, "kernel", NULL, 0, 0755, sd_ctl_dir, },
{0,},
};
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 = 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[12], 13, "flags", &sd->flags,
sizeof(int), 0644, proc_dointvec_minmax);
return table;
}
static ctl_table *sd_alloc_ctl_cpu_table(int cpu)
{
struct ctl_table *entry, *table;
struct sched_domain *sd;
int domain_num = 0, i;
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 = kstrdup(buf, GFP_KERNEL);
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();
struct ctl_table *entry = sd_alloc_ctl_entry(cpu_num + 1);
char buf[32];
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 = kstrdup(buf, GFP_KERNEL);
entry->mode = 0755;
entry->child = sd_alloc_ctl_cpu_table(i);
}
sd_sysctl_header = register_sysctl_table(sd_ctl_root);
}
#else
static void init_sched_domain_sysctl(void)
{
}
#endif
/*
* migration_call - callback that gets triggered when a CPU is added.
* Here we can start up the necessary migration thread for the new CPU.
@ -6311,6 +6431,8 @@ void __init sched_init_smp(void)
/* XXX: Theoretical race here - CPU may be hotplugged now */
hotcpu_notifier(update_sched_domains, 0);
init_sched_domain_sysctl();
/* Move init over to a non-isolated CPU */
if (set_cpus_allowed(current, non_isolated_cpus) < 0)
BUG();