linux-kernel - Re: [PATCH] sched: fix the wrong mask

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Message-Id: <20081017192505.E242.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Fri, 17 Oct 2008 19:25:54 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	miaox@...fujitsu.com
Cc:	kosaki.motohiro@...fujitsu.com, Ingo Molnar <mingo@...e.hu>,
	Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched: fix the wrong mask_len

> If the NR_CPUS isn't a multiple of 32, we get a truncated string of sched
> domains by catting /proc/schedstat. This is caused by the wrong mask_len.
> 
> This patch fix it.
> 
> Signed-off-by: Miao Xie <miaox@...fujitsu.com>
> 
> ---
>  kernel/sched_stats.h |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/sched_stats.h b/kernel/sched_stats.h
> index 8385d43..81365b3 100644
> --- a/kernel/sched_stats.h
> +++ b/kernel/sched_stats.h
> @@ -9,7 +9,7 @@
>  static int show_schedstat(struct seq_file *seq, void *v)
>  {
>  	int cpu;
> -	int mask_len = NR_CPUS/32 * 9;
> +	int mask_len = (NR_CPUS/32 + 1) * 9;
>  	char *mask_str = kmalloc(mask_len, GFP_KERNEL);
>  

DIV_ROUND_UP() is better?



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