On Mon, 6 Jan 2014 16:08:46 -0800 Andi Kleen <a...@firstfloor.org> wrote:
> From: Andi Kleen <a...@linux.intel.com>
>
> [It turns out the documentation patch was already merged
> earlier. So just resending without documentation.]
Confused. How could we have merged the documentation for this feature
but not the feature itself?
> As discussed earlier, this adds a working sysctl to enable/disable
> automatic numa memory balancing at runtime.
>
> This allows to track down performance problems with this
> feature and is generally a good idea.
>
> This was possible earlier through debugfs, but only with special
> debugging options set. Also fix the boot message.
>
> ...
>
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -398,6 +398,15 @@ static struct ctl_table kern_table[] = {
> .mode = 0644,
> .proc_handler = proc_dointvec,
> },
> + {
> + .procname = "numa_balancing",
> + .data = NULL, /* filled in by handler */
> + .maxlen = sizeof(unsigned int),
> + .mode = 0644,
> + .proc_handler = sched_numa_balancing,
> + .extra1 = &zero,
> + .extra2 = &one,
> + },
The name "sched_numa_balancing" is wrong. All the other entries use
"sysctl_numa_balancing_foo", and so should this one.
--- a/include/linux/sched/sysctl.h~numa-add-a-sysctl-for-numa_balancing-fix
+++ a/include/linux/sched/sysctl.h
@@ -100,7 +100,7 @@ extern int sched_rt_handler(struct ctl_t
void __user *buffer, size_t *lenp,
loff_t *ppos);
-extern int sched_numa_balancing(struct ctl_table *table, int write,
+extern int sysctl_numa_balancing(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos);
--- a/kernel/sched/core.c~numa-add-a-sysctl-for-numa_balancing-fix
+++ a/kernel/sched/core.c
@@ -1766,7 +1766,7 @@ void set_numabalancing_state(bool enable
#endif /* CONFIG_SCHED_DEBUG */
#ifdef CONFIG_PROC_SYSCTL
-int sched_numa_balancing(struct ctl_table *table, int write,
+int sysctl_numa_balancing(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
struct ctl_table t;
--- a/kernel/sysctl.c~numa-add-a-sysctl-for-numa_balancing-fix
+++ a/kernel/sysctl.c
@@ -401,7 +401,7 @@ static struct ctl_table kern_table[] = {
.data = NULL, /* filled in by handler */
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = sched_numa_balancing,
+ .proc_handler = sysctl_numa_balancing,
.extra1 = &zero,
.extra2 = &one,
},
_
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