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

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Message-ID: <20150914074317.GA8966@gmail.com>
Date:	Mon, 14 Sep 2015 09:43:17 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Xishi Qiu <qiuxishi@...wei.com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	zhongjiang@...wei.com, Linux MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] numa-balancing: fix confusion in
 /proc/sys/kernel/numa_balancing


* Xishi Qiu <qiuxishi@...wei.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@...wei.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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