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| author | Tejun Heo <tj@kernel.org> | 2015-08-18 13:58:16 -0700 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2015-08-18 13:58:16 -0700 |
| commit | d98817d4961b9ef75062d1e129829d283b3dac57 (patch) | |
| tree | a71076ebe528096084a1290d823c0251691e9172 /kernel/cgroup.c | |
| parent | 731a981e1059dd68c97212ccc9c0e1f169c1a77b (diff) | |
| download | linux-d98817d4961b9ef75062d1e129829d283b3dac57.tar.bz2 | |
cgroup: don't print subsystems for the default hierarchy
It doesn't make sense to print subsystems on mount option or
/proc/PID/cgroup for the default hierarchy.
* cgroup.controllers file at the root of the default hierarchy lists
the currently attached controllers.
* The default hierarchy is catch-all for unmounted subsystems.
* The default hierarchy doesn't accept any mount options.
Suppress subsystem printing on mount options and /proc/PID/cgroup for
the default hierarchy.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: cgroups@vger.kernel.org
Diffstat (limited to 'kernel/cgroup.c')
| -rw-r--r-- | kernel/cgroup.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 3f6641632f73..d9f854defa78 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -1333,9 +1333,10 @@ static int cgroup_show_options(struct seq_file *seq, struct cgroup_subsys *ss; int ssid; - for_each_subsys(ss, ssid) - if (root->subsys_mask & (1 << ssid)) - seq_printf(seq, ",%s", ss->name); + if (root != &cgrp_dfl_root) + for_each_subsys(ss, ssid) + if (root->subsys_mask & (1 << ssid)) + seq_printf(seq, ",%s", ss->name); if (root->flags & CGRP_ROOT_NOPREFIX) seq_puts(seq, ",noprefix"); if (root->flags & CGRP_ROOT_XATTR) @@ -5137,9 +5138,11 @@ int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns, continue; seq_printf(m, "%d:", root->hierarchy_id); - for_each_subsys(ss, ssid) - if (root->subsys_mask & (1 << ssid)) - seq_printf(m, "%s%s", count++ ? "," : "", ss->name); + if (root != &cgrp_dfl_root) + for_each_subsys(ss, ssid) + if (root->subsys_mask & (1 << ssid)) + seq_printf(m, "%s%s", count++ ? "," : "", + ss->name); if (strlen(root->name)) seq_printf(m, "%sname=%s", count ? "," : "", root->name); |