Re: [RFC] proc: change /proc/stat show

[David Rientjes]

On Tue, 17 Mar 2015, Wang, Yalin wrote:

> diff --git a/fs/proc/stat.c b/fs/proc/stat.c
> index 510413eb..60b39e2 100644
> --- a/fs/proc/stat.c
> +++ b/fs/proc/stat.c
> @@ -130,7 +130,7 @@ static int show_stat(struct seq_file *p, void *v)
>  	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
>  	seq_putc(p, '\n');
>  
> -	for_each_online_cpu(i) {
> +	for_each_present_cpu(i) {
>  		/* Copy values here to work around gcc-2.95.3, gcc-2.96 */
>  		user = kcpustat_cpu(i).cpustat[CPUTIME_USER];
>  		nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE];
> @@ -153,6 +153,7 @@ static int show_stat(struct seq_file *p, void *v)
>  		seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal));
>  		seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest));
>  		seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
> +		seq_printf(p, " %d", cpu_online(i)? 1 : 0);
>  		seq_putc(p, '\n');
>  	}
>  	seq_printf(p, "intr %llu", (unsigned long long)sum);

Makes sense, but why do we need to output the cpu state as part of 
/proc/stat?  This information should already be available elsewhere.
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