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cgroup: Define CGROUP_SUBSYS_COUNT according the configuration

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Since we know exactly how many subsystems exists at compile time we are
able to define CGROUP_SUBSYS_COUNT correctly. CGROUP_SUBSYS_COUNT will
be at max 12 (all controllers enabled). Depending on the architecture
we safe either 32 - 12 pointers (80 bytes) or 64 - 12 pointers (416
bytes) per cgroup.

With this change we can also remove the temporary placeholder to avoid
compilation errors.

Signed-off-by: Daniel Wagner <daniel.wagner@bmw-carit.de>
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Cc: Gao feng <gaofeng@cn.fujitsu.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: John Fastabend <john.r.fastabend@intel.com>
Cc: netdev@vger.kernel.org
Cc: cgroups@vger.kernel.org
This commit is contained in:
Daniel Wagner 2012-09-12 16:12:08 +02:00 committed by Tejun Heo
parent 8a8e04df47
commit a6f00298b2
1 changed files with 1 additions and 7 deletions
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8
include/linux/cgroup.h
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@ -49,16 +49,10 @@ extern const struct file_operations proc_cgroup_operations;
#define IS_SUBSYS_ENABLED(option) IS_ENABLED(option)
enum cgroup_subsys_id {
#include <linux/cgroup_subsys.h>
__CGROUP_TEMPORARY_PLACEHOLDER
CGROUP_SUBSYS_COUNT,
};
#undef IS_SUBSYS_ENABLED
#undef SUBSYS
/*
* This define indicates the maximum number of subsystems that can be loaded
* at once. We limit to this many since cgroupfs_root has subsys_bits to keep
* track of all of them.
*/
#define CGROUP_SUBSYS_COUNT (BITS_PER_BYTE*sizeof(unsigned long))
/* Per-subsystem/per-cgroup state maintained by the system. */
struct cgroup_subsys_state {