Commit-ID: cd1bb94b4a0531e8211a3774f17de831f8285f76
Gitweb: http://git.kernel.org/tip/cd1bb94b4a0531e8211a3774f17de831f8285f76
Author: Arun R Bharadwaj <arun@xxxxxxxxxxxxxxxxxx>
AuthorDate: Thu, 16 Apr 2009 12:15:34 +0530
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Wed, 13 May 2009 16:52:42 +0200
timers: /proc/sys sysctl hook to enable timer migration
* Arun R Bharadwaj <arun@xxxxxxxxxxxxxxxxxx> [2009-04-16 12:11:36]:
This patch creates the /proc/sys sysctl interface at
/proc/sys/kernel/timer_migration
Timer migration is enabled by default.
To disable timer migration, when CONFIG_SCHED_DEBUG = y,
echo 0 > /proc/sys/kernel/timer_migration
Signed-off-by: Arun R Bharadwaj <arun@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
include/linux/sched.h | 1 +
kernel/sched.c | 2 ++
kernel/sysctl.c | 8 ++++++++
3 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index b4c38bc..6185040 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1766,6 +1766,7 @@ extern unsigned int sysctl_sched_child_runs_first;
extern unsigned int sysctl_sched_features;
extern unsigned int sysctl_sched_migration_cost;
extern unsigned int sysctl_sched_nr_migrate;
+extern unsigned int sysctl_timer_migration;
int sched_nr_latency_handler(struct ctl_table *table, int write,
struct file *file, void __user *buffer, size_t *length,
diff --git a/kernel/sched.c b/kernel/sched.c
index 9c5b4d3..7f1dd56 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -8731,6 +8731,8 @@ void __init sched_init_smp(void)
}
#endif /* CONFIG_SMP */
+const_debug unsigned int sysctl_timer_migration = 1;
+
int in_sched_functions(unsigned long addr)
{
return in_lock_functions(addr) ||
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index e3d2c7d..b3ce581 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -324,6 +324,14 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = &proc_dointvec,
},
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "timer_migration",
+ .data = &sysctl_timer_migration,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
#endif
{
.ctl_name = CTL_UNNUMBERED,
--
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