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Commit 761b3ef5 authored by Li Zefan's avatar Li Zefan Committed by Tejun Heo
Browse files

cgroup: remove cgroup_subsys argument from callbacks 



The argument is not used at all, and it's not necessary, because
a specific callback handler of course knows which subsys it
belongs to.

Now only ->pupulate() takes this argument, because the handlers of
this callback always call cgroup_add_file()/cgroup_add_files().

So we reduce a few lines of code, though the shrinking of object size
is minimal.

 16 files changed, 113 insertions(+), 162 deletions(-)

   text    data     bss     dec     hex filename
5486240  656987 7039960 13183187         c928d3 vmlinux.o.orig
5486170  656987 7039960 13183117         c9288d vmlinux.o

Signed-off-by: default avatarLi Zefan <lizf@cn.fujitsu.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 61d1d219

Documentation/cgroups/cgroups.txt

+11 −15
Original line number Diff line number Diff line
@@ -558,8 +558,7 @@ Each subsystem may export the following methods. The only mandatory 
methods are create/destroy. Any others that are null are presumed to

be successful no-ops.



struct cgroup_subsys_state *create(struct cgroup_subsys *ss,

				   struct cgroup *cgrp)

struct cgroup_subsys_state *create(struct cgroup *cgrp)

(cgroup_mutex held by caller)



Called to create a subsystem state object for a cgroup. The
@@ -574,7 +573,7 @@ identified by the passed cgroup object having a NULL parent (since 
it's the root of the hierarchy) and may be an appropriate place for

initialization code.



void destroy(struct cgroup_subsys *ss, struct cgroup *cgrp)

void destroy(struct cgroup *cgrp)

(cgroup_mutex held by caller)



The cgroup system is about to destroy the passed cgroup; the subsystem
@@ -585,7 +584,7 @@ cgroup->parent is still valid. (Note - can also be called for a 
newly-created cgroup if an error occurs after this subsystem's

create() method has been called for the new cgroup).



int pre_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp);

int pre_destroy(struct cgroup *cgrp);



Called before checking the reference count on each subsystem. This may

be useful for subsystems which have some extra references even if
@@ -593,8 +592,7 @@ there are not tasks in the cgroup. If pre_destroy() returns error code, 
rmdir() will fail with it. From this behavior, pre_destroy() can be

called multiple times against a cgroup.



int can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,

	       struct cgroup_taskset *tset)

int can_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)

(cgroup_mutex held by caller)



Called prior to moving one or more tasks into a cgroup; if the
@@ -615,8 +613,7 @@ fork. If this method returns 0 (success) then this should remain valid 
while the caller holds cgroup_mutex and it is ensured that either

attach() or cancel_attach() will be called in future.



void cancel_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,

		   struct cgroup_taskset *tset)

void cancel_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)

(cgroup_mutex held by caller)



Called when a task attach operation has failed after can_attach() has succeeded.
@@ -625,23 +622,22 @@ function, so that the subsystem can implement a rollback. If not, not necessary. 
This will be called only about subsystems whose can_attach() operation have

succeeded. The parameters are identical to can_attach().



void attach(struct cgroup_subsys *ss, struct cgroup *cgrp,

	    struct cgroup_taskset *tset)

void attach(struct cgroup *cgrp, struct cgroup_taskset *tset)

(cgroup_mutex held by caller)



Called after the task has been attached to the cgroup, to allow any

post-attachment activity that requires memory allocations or blocking.

The parameters are identical to can_attach().



void fork(struct cgroup_subsy *ss, struct task_struct *task)

void fork(struct task_struct *task)



Called when a task is forked into a cgroup.



void exit(struct cgroup_subsys *ss, struct task_struct *task)

void exit(struct task_struct *task)



Called during task exit.



int populate(struct cgroup_subsys *ss, struct cgroup *cgrp)

int populate(struct cgroup *cgrp)

(cgroup_mutex held by caller)



Called after creation of a cgroup to allow a subsystem to populate
@@ -651,7 +647,7 @@ include/linux/cgroup.h for details). Note that although this 
method can return an error code, the error code is currently not

always handled well.



void post_clone(struct cgroup_subsys *ss, struct cgroup *cgrp)

void post_clone(struct cgroup *cgrp)

(cgroup_mutex held by caller)



Called during cgroup_create() to do any parameter
@@ -659,7 +655,7 @@ initialization which might be required before a task could attach. For 
example in cpusets, no task may attach before 'cpus' and 'mems' are set

up.



void bind(struct cgroup_subsys *ss, struct cgroup *root)

void bind(struct cgroup *root)

(cgroup_mutex and ss->hierarchy_mutex held by caller)



Called when a cgroup subsystem is rebound to a different hierarchy

block/blk-cgroup.c

+8 −14
Original line number Diff line number Diff line
@@ -28,13 +28,10 @@ static LIST_HEAD(blkio_list); 
struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT };

EXPORT_SYMBOL_GPL(blkio_root_cgroup);



static struct cgroup_subsys_state *blkiocg_create(struct cgroup_subsys *,

						  struct cgroup *);

static int blkiocg_can_attach(struct cgroup_subsys *, struct cgroup *,

			      struct cgroup_taskset *);

static void blkiocg_attach(struct cgroup_subsys *, struct cgroup *,

			   struct cgroup_taskset *);

static void blkiocg_destroy(struct cgroup_subsys *, struct cgroup *);

static struct cgroup_subsys_state *blkiocg_create(struct cgroup *);

static int blkiocg_can_attach(struct cgroup *, struct cgroup_taskset *);

static void blkiocg_attach(struct cgroup *, struct cgroup_taskset *);

static void blkiocg_destroy(struct cgroup *);

static int blkiocg_populate(struct cgroup_subsys *, struct cgroup *);



/* for encoding cft->private value on file */
@@ -1548,7 +1545,7 @@ static int blkiocg_populate(struct cgroup_subsys *subsys, struct cgroup *cgroup) 
				ARRAY_SIZE(blkio_files));

}



static void blkiocg_destroy(struct cgroup_subsys *subsys, struct cgroup *cgroup)

static void blkiocg_destroy(struct cgroup *cgroup)

{

	struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup);

	unsigned long flags;
@@ -1598,8 +1595,7 @@ static void blkiocg_destroy(struct cgroup_subsys *subsys, struct cgroup *cgroup) 
		kfree(blkcg);

}



static struct cgroup_subsys_state *

blkiocg_create(struct cgroup_subsys *subsys, struct cgroup *cgroup)

static struct cgroup_subsys_state *blkiocg_create(struct cgroup *cgroup)

{

	struct blkio_cgroup *blkcg;

	struct cgroup *parent = cgroup->parent;
@@ -1628,8 +1624,7 @@ done: 
 * of the main cic data structures.  For now we allow a task to change

 * its cgroup only if it's the only owner of its ioc.

 */

static int blkiocg_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,

			      struct cgroup_taskset *tset)

static int blkiocg_can_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)

{

	struct task_struct *task;

	struct io_context *ioc;
@@ -1648,8 +1643,7 @@ static int blkiocg_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp, 
	return ret;

}



static void blkiocg_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,

			   struct cgroup_taskset *tset)

static void blkiocg_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)

{

	struct task_struct *task;

	struct io_context *ioc;

include/linux/cgroup.h

+12 −17
Original line number Diff line number Diff line
@@ -452,23 +452,18 @@ int cgroup_taskset_size(struct cgroup_taskset *tset); 
 */



struct cgroup_subsys {

	struct cgroup_subsys_state *(*create)(struct cgroup_subsys *ss,

						  struct cgroup *cgrp);

	int (*pre_destroy)(struct cgroup_subsys *ss, struct cgroup *cgrp);

	void (*destroy)(struct cgroup_subsys *ss, struct cgroup *cgrp);

	int (*can_attach)(struct cgroup_subsys *ss, struct cgroup *cgrp,

			  struct cgroup_taskset *tset);

	void (*cancel_attach)(struct cgroup_subsys *ss, struct cgroup *cgrp,

			      struct cgroup_taskset *tset);

	void (*attach)(struct cgroup_subsys *ss, struct cgroup *cgrp,

		       struct cgroup_taskset *tset);

	void (*fork)(struct cgroup_subsys *ss, struct task_struct *task);

	void (*exit)(struct cgroup_subsys *ss, struct cgroup *cgrp,

			struct cgroup *old_cgrp, struct task_struct *task);

	int (*populate)(struct cgroup_subsys *ss,

			struct cgroup *cgrp);

	void (*post_clone)(struct cgroup_subsys *ss, struct cgroup *cgrp);

	void (*bind)(struct cgroup_subsys *ss, struct cgroup *root);

	struct cgroup_subsys_state *(*create)(struct cgroup *cgrp);

	int (*pre_destroy)(struct cgroup *cgrp);

	void (*destroy)(struct cgroup *cgrp);

	int (*can_attach)(struct cgroup *cgrp, struct cgroup_taskset *tset);

	void (*cancel_attach)(struct cgroup *cgrp, struct cgroup_taskset *tset);

	void (*attach)(struct cgroup *cgrp, struct cgroup_taskset *tset);

	void (*fork)(struct task_struct *task);

	void (*exit)(struct cgroup *cgrp, struct cgroup *old_cgrp,

		     struct task_struct *task);

	int (*populate)(struct cgroup_subsys *ss, struct cgroup *cgrp);

	void (*post_clone)(struct cgroup *cgrp);

	void (*bind)(struct cgroup *root);



	int subsys_id;

	int active;

include/net/sock.h

+3 −4
Original line number Diff line number Diff line
@@ -68,7 +68,7 @@ struct cgroup; 
struct cgroup_subsys;

#ifdef CONFIG_NET

int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss);

void mem_cgroup_sockets_destroy(struct cgroup *cgrp, struct cgroup_subsys *ss);

void mem_cgroup_sockets_destroy(struct cgroup *cgrp);

#else

static inline

int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss)
@@ -76,7 +76,7 @@ int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss) 
	return 0;

}

static inline

void mem_cgroup_sockets_destroy(struct cgroup *cgrp, struct cgroup_subsys *ss)

void mem_cgroup_sockets_destroy(struct cgroup *cgrp)

{

}

#endif
@@ -869,8 +869,7 @@ struct proto { 
	 */

	int			(*init_cgroup)(struct cgroup *cgrp,

					       struct cgroup_subsys *ss);

	void			(*destroy_cgroup)(struct cgroup *cgrp,

						  struct cgroup_subsys *ss);

	void			(*destroy_cgroup)(struct cgroup *cgrp);

	struct cg_proto		*(*proto_cgroup)(struct mem_cgroup *memcg);

#endif

};

include/net/tcp_memcontrol.h

+1 −1
Original line number Diff line number Diff line
@@ -13,7 +13,7 @@ struct tcp_memcontrol { 


struct cg_proto *tcp_proto_cgroup(struct mem_cgroup *memcg);

int tcp_init_cgroup(struct cgroup *cgrp, struct cgroup_subsys *ss);

void tcp_destroy_cgroup(struct cgroup *cgrp, struct cgroup_subsys *ss);

void tcp_destroy_cgroup(struct cgroup *cgrp);

unsigned long long tcp_max_memory(const struct mem_cgroup *memcg);

void tcp_prot_mem(struct mem_cgroup *memcg, long val, int idx);

#endif /* _TCP_MEMCG_H */