X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=include%2Flinux%2Fcgroup.h;h=e155aa78d8594eb545547f48f47c7b53bf9fc36a;hb=d0dcd41d7b463de955b7ae7a55f76ff4216ed665;hp=2ebf7afedd9fa0cb621c144202792493ed4b80ab;hpb=a043e3b2c63445512c5592cbe3c8694f3c655e81;p=linux-2.6-omap-h63xx.git diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 2ebf7afedd9..e155aa78d85 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -88,6 +88,17 @@ static inline void css_put(struct cgroup_subsys_state *css) __css_put(css); } +/* bits in struct cgroup flags field */ +enum { + /* Control Group is dead */ + CGRP_REMOVED, + /* Control Group has previously had a child cgroup or a task, + * but no longer (only if CGRP_NOTIFY_ON_RELEASE is set) */ + CGRP_RELEASABLE, + /* Control Group requires release notifications to userspace */ + CGRP_NOTIFY_ON_RELEASE, +}; + struct cgroup { unsigned long flags; /* "unsigned long" so bitops work */ @@ -139,10 +150,10 @@ struct css_set { struct kref ref; /* - * List running through all cgroup groups. Protected by - * css_set_lock + * List running through all cgroup groups in the same hash + * slot. Protected by css_set_lock */ - struct list_head list; + struct hlist_node hlist; /* * List running through all tasks using this cgroup @@ -163,7 +174,16 @@ struct css_set { * during subsystem registration (at boot time). */ struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT]; +}; +/* + * cgroup_map_cb is an abstract callback API for reporting map-valued + * control files + */ + +struct cgroup_map_cb { + int (*fill)(struct cgroup_map_cb *cb, const char *key, u64 value); + void *state; }; /* struct cftype: @@ -186,24 +206,55 @@ struct cftype { char name[MAX_CFTYPE_NAME]; int private; int (*open) (struct inode *inode, struct file *file); - ssize_t (*read) (struct cgroup *cont, struct cftype *cft, + ssize_t (*read) (struct cgroup *cgrp, struct cftype *cft, struct file *file, char __user *buf, size_t nbytes, loff_t *ppos); /* - * read_uint() is a shortcut for the common case of returning a + * read_u64() is a shortcut for the common case of returning a * single integer. Use it in place of read() */ - u64 (*read_uint) (struct cgroup *cont, struct cftype *cft); - ssize_t (*write) (struct cgroup *cont, struct cftype *cft, + u64 (*read_u64) (struct cgroup *cgrp, struct cftype *cft); + /* + * read_s64() is a signed version of read_u64() + */ + s64 (*read_s64) (struct cgroup *cgrp, struct cftype *cft); + /* + * read_map() is used for defining a map of key/value + * pairs. It should call cb->fill(cb, key, value) for each + * entry. The key/value pairs (and their ordering) should not + * change between reboots. + */ + int (*read_map) (struct cgroup *cont, struct cftype *cft, + struct cgroup_map_cb *cb); + /* + * read_seq_string() is used for outputting a simple sequence + * using seqfile. + */ + int (*read_seq_string) (struct cgroup *cont, struct cftype *cft, + struct seq_file *m); + + ssize_t (*write) (struct cgroup *cgrp, struct cftype *cft, struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos); /* - * write_uint() is a shortcut for the common case of accepting + * write_u64() is a shortcut for the common case of accepting * a single integer (as parsed by simple_strtoull) from * userspace. Use in place of write(); return 0 or error. */ - int (*write_uint) (struct cgroup *cont, struct cftype *cft, u64 val); + int (*write_u64) (struct cgroup *cgrp, struct cftype *cft, u64 val); + /* + * write_s64() is a signed version of write_u64() + */ + int (*write_s64) (struct cgroup *cgrp, struct cftype *cft, s64 val); + + /* + * trigger() callback can be used to get some kick from the + * userspace, when the actual string written is not important + * at all. The private field can be used to determine the + * kick type for multiplexing. + */ + int (*trigger)(struct cgroup *cgrp, unsigned int event); int (*release) (struct inode *inode, struct file *file); }; @@ -218,44 +269,51 @@ struct cgroup_scanner { /* Add a new file to the given cgroup directory. Should only be * called by subsystems from within a populate() method */ -int cgroup_add_file(struct cgroup *cont, struct cgroup_subsys *subsys, +int cgroup_add_file(struct cgroup *cgrp, struct cgroup_subsys *subsys, const struct cftype *cft); /* Add a set of new files to the given cgroup directory. Should * only be called by subsystems from within a populate() method */ -int cgroup_add_files(struct cgroup *cont, +int cgroup_add_files(struct cgroup *cgrp, struct cgroup_subsys *subsys, const struct cftype cft[], int count); -int cgroup_is_removed(const struct cgroup *cont); +int cgroup_is_removed(const struct cgroup *cgrp); -int cgroup_path(const struct cgroup *cont, char *buf, int buflen); +int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen); -int cgroup_task_count(const struct cgroup *cont); +int cgroup_task_count(const struct cgroup *cgrp); /* Return true if the cgroup is a descendant of the current cgroup */ -int cgroup_is_descendant(const struct cgroup *cont); +int cgroup_is_descendant(const struct cgroup *cgrp); /* Control Group subsystem type. See Documentation/cgroups.txt for details */ struct cgroup_subsys { struct cgroup_subsys_state *(*create)(struct cgroup_subsys *ss, - struct cgroup *cont); - void (*pre_destroy)(struct cgroup_subsys *ss, struct cgroup *cont); - void (*destroy)(struct cgroup_subsys *ss, struct cgroup *cont); + struct cgroup *cgrp); + void (*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 *cont, struct task_struct *tsk); - void (*attach)(struct cgroup_subsys *ss, struct cgroup *cont, - struct cgroup *old_cont, struct task_struct *tsk); + struct cgroup *cgrp, struct task_struct *tsk); + void (*attach)(struct cgroup_subsys *ss, struct cgroup *cgrp, + struct cgroup *old_cgrp, struct task_struct *tsk); void (*fork)(struct cgroup_subsys *ss, struct task_struct *task); void (*exit)(struct cgroup_subsys *ss, struct task_struct *task); int (*populate)(struct cgroup_subsys *ss, - struct cgroup *cont); - void (*post_clone)(struct cgroup_subsys *ss, struct cgroup *cont); + struct cgroup *cgrp); + void (*post_clone)(struct cgroup_subsys *ss, struct cgroup *cgrp); void (*bind)(struct cgroup_subsys *ss, struct cgroup *root); + /* + * This routine is called with the task_lock of mm->owner held + */ + void (*mm_owner_changed)(struct cgroup_subsys *ss, + struct cgroup *old, + struct cgroup *new); int subsys_id; int active; + int disabled; int early_init; #define MAX_CGROUP_TYPE_NAMELEN 32 const char *name; @@ -273,9 +331,9 @@ struct cgroup_subsys { #undef SUBSYS static inline struct cgroup_subsys_state *cgroup_subsys_state( - struct cgroup *cont, int subsys_id) + struct cgroup *cgrp, int subsys_id) { - return cont->subsys[subsys_id]; + return cgrp->subsys[subsys_id]; } static inline struct cgroup_subsys_state *task_subsys_state( @@ -290,8 +348,6 @@ static inline struct cgroup* task_cgroup(struct task_struct *task, return task_subsys_state(task, subsys_id)->cgroup; } -int cgroup_path(const struct cgroup *cont, char *buf, int buflen); - int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *ss); /* A cgroup_iter should be treated as an opaque object */ @@ -313,10 +369,10 @@ struct cgroup_iter { * - cgroup_scan_tasks() holds the css_set_lock when calling the test_task() * callback, but not while calling the process_task() callback. */ -void cgroup_iter_start(struct cgroup *cont, struct cgroup_iter *it); -struct task_struct *cgroup_iter_next(struct cgroup *cont, +void cgroup_iter_start(struct cgroup *cgrp, struct cgroup_iter *it); +struct task_struct *cgroup_iter_next(struct cgroup *cgrp, struct cgroup_iter *it); -void cgroup_iter_end(struct cgroup *cont, struct cgroup_iter *it); +void cgroup_iter_end(struct cgroup *cgrp, struct cgroup_iter *it); int cgroup_scan_tasks(struct cgroup_scanner *scan); int cgroup_attach_task(struct cgroup *, struct task_struct *); @@ -340,4 +396,13 @@ static inline int cgroupstats_build(struct cgroupstats *stats, #endif /* !CONFIG_CGROUPS */ +#ifdef CONFIG_MM_OWNER +extern void +cgroup_mm_owner_callbacks(struct task_struct *old, struct task_struct *new); +#else /* !CONFIG_MM_OWNER */ +static inline void +cgroup_mm_owner_callbacks(struct task_struct *old, struct task_struct *new) +{ +} +#endif /* CONFIG_MM_OWNER */ #endif /* _LINUX_CGROUP_H */