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cgroup: drop module support

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With module supported dropped from net_prio, no controller is using
cgroup module support.  None of actual resource controllers can be
built as a module and we aren't gonna add new controllers which don't
control resources.  This patch drops module support from cgroup.

* cgroup_[un]load_subsys() and cgroup_subsys->module removed.

* As there's no point in distinguishing IS_BUILTIN() and IS_MODULE(),
  cgroup_subsys.h now uses IS_ENABLED() directly.

* enum cgroup_subsys_id now exactly matches the list of enabled
  controllers as ordered in cgroup_subsys.h.

* cgroup_subsys[] is now a contiguously occupied array.  Size
  specification is no longer necessary and dropped.

* for_each_builtin_subsys() is removed and for_each_subsys() is
  updated to not require any locking.

* module ref handling is removed from rebind_subsystems().

* Module related comments dropped.

v2: Rebased on top of fe1217c4f3 ("net: net_cls: move cgroupfs
    classid handling into core").

v3: Added {} around the if (need_forkexit_callback) block in
    cgroup_post_fork() for readability as suggested by Li.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
This commit is contained in:
Tejun Heo
2014-02-08 10:36:58 -05:00
parent af6363374c
commit 3ed80a62bf
6 changed files with 32 additions and 308 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/linux/cgroup.h
+4 -25
View File
@@ -37,28 +37,13 @@ extern void cgroup_post_fork(struct task_struct *p);
extern void cgroup_exit(struct task_struct *p, int run_callbacks);
extern int cgroupstats_build(struct cgroupstats *stats,
struct dentry *dentry);
extern int cgroup_load_subsys(struct cgroup_subsys *ss);
extern void cgroup_unload_subsys(struct cgroup_subsys *ss);
extern int proc_cgroup_show(struct seq_file *, void *);
/*
* Define the enumeration of all cgroup subsystems.
*
* We define ids for builtin subsystems and then modular ones.
*/
/* define the enumeration of all cgroup subsystems */
#define SUBSYS(_x) _x ## _subsys_id,
enum cgroup_subsys_id {
#define IS_SUBSYS_ENABLED(option) IS_BUILTIN(option)
#include <linux/cgroup_subsys.h>
#undef IS_SUBSYS_ENABLED
CGROUP_BUILTIN_SUBSYS_COUNT,
__CGROUP_SUBSYS_TEMP_PLACEHOLDER = CGROUP_BUILTIN_SUBSYS_COUNT - 1,
#define IS_SUBSYS_ENABLED(option) IS_MODULE(option)
#include <linux/cgroup_subsys.h>
#undef IS_SUBSYS_ENABLED
CGROUP_SUBSYS_COUNT,
};
#undef SUBSYS
@@ -370,10 +355,9 @@ struct css_set {
struct list_head cgrp_links;
/*
* Set of subsystem states, one for each subsystem. This array
* is immutable after creation apart from the init_css_set
* during subsystem registration (at boot time) and modular subsystem
* loading/unloading.
* Set of subsystem states, one for each subsystem. This array is
* immutable after creation apart from the init_css_set during
* subsystem registration (at boot time).
*/
struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT];
@@ -620,15 +604,10 @@ struct cgroup_subsys {
/* base cftypes, automatically [de]registered with subsys itself */
struct cftype *base_cftypes;
struct cftype_set base_cftset;
/* should be defined only by modular subsystems */
struct module *module;
};
#define SUBSYS(_x) extern struct cgroup_subsys _x ## _subsys;
#define IS_SUBSYS_ENABLED(option) IS_BUILTIN(option)
#include <linux/cgroup_subsys.h>
#undef IS_SUBSYS_ENABLED
#undef SUBSYS
/**
include/linux/cgroup_subsys.h
+12 -12
View File
@@ -3,51 +3,51 @@
*
* DO NOT ADD ANY SUBSYSTEM WITHOUT EXPLICIT ACKS FROM CGROUP MAINTAINERS.
*/
#if IS_SUBSYS_ENABLED(CONFIG_CPUSETS)
#if IS_ENABLED(CONFIG_CPUSETS)
SUBSYS(cpuset)
#endif
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_DEBUG)
#if IS_ENABLED(CONFIG_CGROUP_DEBUG)
SUBSYS(debug)
#endif
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_SCHED)
#if IS_ENABLED(CONFIG_CGROUP_SCHED)
SUBSYS(cpu_cgroup)
#endif
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_CPUACCT)
#if IS_ENABLED(CONFIG_CGROUP_CPUACCT)
SUBSYS(cpuacct)
#endif
#if IS_SUBSYS_ENABLED(CONFIG_MEMCG)
#if IS_ENABLED(CONFIG_MEMCG)
SUBSYS(mem_cgroup)
#endif
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_DEVICE)
#if IS_ENABLED(CONFIG_CGROUP_DEVICE)
SUBSYS(devices)
#endif
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_FREEZER)
#if IS_ENABLED(CONFIG_CGROUP_FREEZER)
SUBSYS(freezer)
#endif
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_NET_CLASSID)
#if IS_ENABLED(CONFIG_CGROUP_NET_CLASSID)
SUBSYS(net_cls)
#endif
#if IS_SUBSYS_ENABLED(CONFIG_BLK_CGROUP)
#if IS_ENABLED(CONFIG_BLK_CGROUP)
SUBSYS(blkio)
#endif
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_PERF)
#if IS_ENABLED(CONFIG_CGROUP_PERF)
SUBSYS(perf)
#endif
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_NET_PRIO)
#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
SUBSYS(net_prio)
#endif
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_HUGETLB)
#if IS_ENABLED(CONFIG_CGROUP_HUGETLB)
SUBSYS(hugetlb)
#endif
/*