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memcg: kill CONFIG_MM_OWNER

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CONFIG_MM_OWNER makes no sense.  It is not user-selectable, it is only
selected by CONFIG_MEMCG automatically.  So we can kill this option in
init/Kconfig and do s/CONFIG_MM_OWNER/CONFIG_MEMCG/ globally.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2014-06-04 16:07:34 -07:00 committed by Linus Torvalds
parent 64ac4940d5
commit f98bafa06a
5 changed files with 7 additions and 14 deletions
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2
include/linux/mm_types.h
View file

@ -406,7 +406,7 @@ struct mm_struct {
spinlock_t ioctx_lock;
struct kioctx_table __rcu *ioctx_table;
#endif
#ifdef CONFIG_MM_OWNER
#ifdef CONFIG_MEMCG
/*
* "owner" points to a task that is regarded as the canonical
* user/owner of this mm. All of the following must be true in

4
include/linux/sched.h
View file

@ -2967,7 +2967,7 @@ static inline void inc_syscw(struct task_struct *tsk)
#define TASK_SIZE_OF(tsk) TASK_SIZE
#endif
#ifdef CONFIG_MM_OWNER
#ifdef CONFIG_MEMCG
extern void mm_update_next_owner(struct mm_struct *mm);
extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
#else
@ -2978,7 +2978,7 @@ static inline void mm_update_next_owner(struct mm_struct *mm)
static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
{
}
#endif /* CONFIG_MM_OWNER */
#endif /* CONFIG_MEMCG */
static inline unsigned long task_rlimit(const struct task_struct *tsk,
unsigned int limit)

7
init/Kconfig
View file

@ -933,7 +933,6 @@ config RESOURCE_COUNTERS
config MEMCG
bool "Memory Resource Controller for Control Groups"
depends on RESOURCE_COUNTERS
select MM_OWNER
select EVENTFD
help
Provides a memory resource controller that manages both anonymous
@ -951,9 +950,6 @@ config MEMCG
disable memory resource controller and you can avoid overheads.
(and lose benefits of memory resource controller)
This config option also selects MM_OWNER config option, which
could in turn add some fork/exit overhead.
config MEMCG_SWAP
bool "Memory Resource Controller Swap Extension"
depends on MEMCG && SWAP
@ -1179,9 +1175,6 @@ config SCHED_AUTOGROUP
desktop applications. Task group autogeneration is currently based
upon task session.
config MM_OWNER
bool
config SYSFS_DEPRECATED
bool "Enable deprecated sysfs features to support old userspace tools"
depends on SYSFS

4
kernel/exit.c
View file

@ -352,7 +352,7 @@ int disallow_signal(int sig)
EXPORT_SYMBOL(disallow_signal);
#ifdef CONFIG_MM_OWNER
#ifdef CONFIG_MEMCG
/*
* A task is exiting. If it owned this mm, find a new owner for the mm.
*/
@ -434,7 +434,7 @@ void mm_update_next_owner(struct mm_struct *mm)
task_unlock(c);
put_task_struct(c);
}
#endif /* CONFIG_MM_OWNER */
#endif /* CONFIG_MEMCG */
/*
* Turn us into a lazy TLB process if we

4
kernel/fork.c
View file

@ -1099,12 +1099,12 @@ static void rt_mutex_init_task(struct task_struct *p)
#endif
}
#ifdef CONFIG_MM_OWNER
#ifdef CONFIG_MEMCG
void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
{
mm->owner = p;
}
#endif /* CONFIG_MM_OWNER */
#endif /* CONFIG_MEMCG */
/*
* Initialize POSIX timer handling for a single task.