tools/lssubsys: add support status for the tool

lssubsys currently doesn't support the cgroups v2 filesystem.  Add the
warning about the support status in the help.

Fixes: https://github.com/libcgroup/libcgroup/issues/50
Suggested-by: Tom Hromatka <tom.hromatka@oracle.com>
Signed-off-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>
Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>

diff --git a/src/tools/lssubsys.c b/src/tools/lssubsys.c
index f53b0425e60a94a48accca32b61a2651abe6ac41..7741146f9aa7cffdf4360284c5dbc1d34e78bdc2 100644 (file)
--- a/src/tools/lssubsys.c
+++ b/src/tools/lssubsys.c
@@ -45,6 +45,7 @@ static void usage(int status, const char *program_name)
        info("hierarchies\n");
        info("  -m, --mount-points              Display mount points\n");
        info("  -M, --all-mount-points  Display all mount points\n");
+       info("(Note: currently supported on cgroups v1 only)\n");
 }
 
 static int print_controller_mount(const char *controller, int flags,