linux-kernel - Re: [PATCH] cgroup: print pretty format in /proc/cgroups

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Message-ID: <20140415125325.GH13914@redhat.com>
Date:	Tue, 15 Apr 2014 13:53:25 +0100
From:	"Daniel P. Berrange" <berrange@...hat.com>
To:	Jianyu Zhan <nasa4836@...il.com>
Cc:	tj@...nel.org, lizefan@...wei.com, cgroups@...r.kernel.org,
	containers@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cgroup: print pretty format in /proc/cgroups

On Tue, Apr 15, 2014 at 08:47:45PM +0800, Jianyu Zhan wrote:
> I found that /proc/cgroups printed format has ugly alignment(see below).

[snip]

> diff --git a/kernel/cgroup.c b/kernel/cgroup.c
> index 9fcdaa7..d981697 100644
> --- a/kernel/cgroup.c
> +++ b/kernel/cgroup.c
> @@ -4347,7 +4347,7 @@ static int proc_cgroupstats_show(struct seq_file *m, void *v)
>  	mutex_lock(&cgroup_mutex);
>  
>  	for_each_subsys(ss, i)
> -		seq_printf(m, "%s\t%d\t%d\t%d\n",
> +		seq_printf(m, "%-16s%-16d%-16d%-16d\n",
>  			   ss->name, ss->root->hierarchy_id,
>  			   atomic_read(&ss->root->nr_cgrps), !ss->disabled);

This is liable to break userspace apps which might currently parse the
file by splitting on '\t'

Regards,
Daniel
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