linux-kernel - [Patch v2] cgroup: pretty format /proc/cgroups

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Date:   Mon, 15 Nov 2021 01:12:53 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     tj@...nel.org, lizefan.x@...edance.com, hannes@...xchg.org
Cc:     cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wei Yang <richard.weiyang@...il.com>
Subject: [Patch v2] cgroup: pretty format /proc/cgroups

Current /proc/cgroups looks like this:

 subsys_name    hierarchy       num_cgroups     enabled
cpuset  3       1       1
cpu     2       1       1
cpuacct 2       1       1
memory  4       71      1
freezer 5       1       1

Let's align the title and value. After this patch, it looks like this.

 subsys_name    hierarchy       num_cgroups     enabled
      cpuset            5                 1           1
         cpu            3                 1           1
     cpuacct            3                 1           1
      memory            2                71           1
     freezer            4                 1           1

Signed-off-by: Wei Yang <richard.weiyang@...il.com>

---
v2: the title line is omitted for the start "#"

---
 kernel/cgroup/cgroup-v1.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c
index 81c9e0685948..5b177e0eca2c 100644
--- a/kernel/cgroup/cgroup-v1.c
+++ b/kernel/cgroup/cgroup-v1.c
@@ -664,7 +664,7 @@ int proc_cgroupstats_show(struct seq_file *m, void *v)
 	 */
 
 	for_each_subsys(ss, i)
-		seq_printf(m, "%s\t%d\t%d\t%d\n",
+		seq_printf(m, "%12s\t%9d\t%11d\t%7d\n",
 			   ss->legacy_name, ss->root->hierarchy_id,
 			   atomic_read(&ss->root->nr_cgrps),
 			   cgroup_ssid_enabled(i));
-- 
2.33.1