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cgroups: include hierarchy ids in /proc/<pid>/cgroup

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Extend the /proc/<pid>/cgroup file to include the appropriate hierarchy ID on
each line.

Currently this ID isn't really needed since a hierarchy can be completely
identified by the set of subsystems bound to it, but this is likely to change
in the near future in order to support stateless subsystems and
merging/rebinding of subsystems.  Getting this change into 2.6.25 reduces the
need for an API change later.

Signed-off-by: Paul Menage <menage@google.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Paul Menage 2008-04-10 21:29:16 -07:00 committed by Linus Torvalds
parent d10d89ec78
commit b6c3006d20
1 changed files with 1 additions and 0 deletions
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1
kernel/cgroup.c
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@ -2569,6 +2569,7 @@ static int proc_cgroup_show(struct seq_file *m, void *v)
/* Skip this hierarchy if it has no active subsystems */
if (!root->actual_subsys_bits)
continue;
seq_printf(m, "%lu:", root->subsys_bits);
for_each_subsys(root, ss)
seq_printf(m, "%s%s", count++ ? "," : "", ss->name);
seq_putc(m, ':');