[PATCH] numa-balancing: fix confusion in /proc/sys/kernel/numa_balancing

[PATCH] numa-balancing: fix confusion in /proc/sys/kernel/numa_balancing

[Xishi Qiu]

We can only echo 0 or 1 > "/proc/sys/kernel/numa_balancing", usually 1 means
enable and 0 means disable. But when echo 1, it shows the value is 65536, this
is confusion.

Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
---
 kernel/sched/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 3595403..e97a348 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2135,7 +2135,7 @@ int sysctl_numa_balancing(struct ctl_table *table, int write,
 {
 	struct ctl_table t;
 	int err;
-	int state = numabalancing_enabled;
+	int state = !!numabalancing_enabled;
 
 	if (write && !capable(CAP_SYS_ADMIN))
 		return -EPERM;
-- 
2.0.0


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Re: [PATCH] numa-balancing: fix confusion in /proc/sys/kernel/numa_balancing

[Ingo Molnar]

* Xishi Qiu <qiuxishi@huawei.com> wrote:

> We can only echo 0 or 1 > "/proc/sys/kernel/numa_balancing", usually 1 means
> enable and 0 means disable. But when echo 1, it shows the value is 65536, this
> is confusion.
> 
> Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
> ---
>  kernel/sched/core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 3595403..e97a348 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -2135,7 +2135,7 @@ int sysctl_numa_balancing(struct ctl_table *table, int write,
>  {
>  	struct ctl_table t;
>  	int err;
> -	int state = numabalancing_enabled;
> +	int state = !!numabalancing_enabled;
>  
>  	if (write && !capable(CAP_SYS_ADMIN))
>  		return -EPERM;

So in the latest scheduler tree this variable got renamed, please adjust your 
patch:

  git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/core


Thanks,

	Ingo

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Re: [PATCH] numa-balancing: fix confusion in /proc/sys/kernel/numa_balancing

[Xishi Qiu]

On 2015/9/14 15:43, Ingo Molnar wrote:

> 
> * Xishi Qiu <qiuxishi@huawei.com> wrote:
> 
>> We can only echo 0 or 1 > "/proc/sys/kernel/numa_balancing", usually 1 means
>> enable and 0 means disable. But when echo 1, it shows the value is 65536, this
>> is confusion.
>>
>> Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
>> ---
>>  kernel/sched/core.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
>> index 3595403..e97a348 100644
>> --- a/kernel/sched/core.c
>> +++ b/kernel/sched/core.c
>> @@ -2135,7 +2135,7 @@ int sysctl_numa_balancing(struct ctl_table *table, int write,
>>  {
>>  	struct ctl_table t;
>>  	int err;
>> -	int state = numabalancing_enabled;
>> +	int state = !!numabalancing_enabled;
>>  
>>  	if (write && !capable(CAP_SYS_ADMIN))
>>  		return -EPERM;
> 
> So in the latest scheduler tree this variable got renamed, please adjust your 
> patch:
> 
>   git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/core
> 

Hi Ingo,

I tested the latest kernel in the above tree, it seems that the problem has
been fixed. So please drop this patch.

Thanks,
Xishi Qiu

> 
> Thanks,
> 
> 	Ingo
> 
> 



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