Commit 7ef949d7 authored by Michal Hocko's avatar Michal Hocko Committed by Linus Torvalds
Browse files

mm: oom_reaper: remove some bloat 

mmput_async is currently used only from the oom_reaper which is defined
only for CONFIG_MMU.  We can save work_struct in mm_struct for
!CONFIG_MMU.

[akpm@linux-foundation.org: fix typo, per Minchan]
Link: http://lkml.kernel.org/r/20160520061658.GB19172@dhcp22.suse.cz


Reported-by: default avatarMinchan Kim <minchan@kernel.org>
Signed-off-by: default avatarMichal Hocko <mhocko@suse.com>
Acked-by: default avatarMinchan Kim <minchan@kernel.org>
Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 1ebab2db

include/linux/mm_types.h

+2 −0
Original line number Diff line number Diff line
@@ -514,7 +514,9 @@ struct mm_struct { 
#ifdef CONFIG_HUGETLB_PAGE

	atomic_long_t hugetlb_usage;

#endif

#ifdef CONFIG_MMU

	struct work_struct async_put_work;

#endif

};



static inline void mm_init_cpumask(struct mm_struct *mm)

include/linux/sched.h

+3 −1
Original line number Diff line number Diff line
@@ -2745,10 +2745,12 @@ static inline bool mmget_not_zero(struct mm_struct *mm) 


/* mmput gets rid of the mappings and all user-space */

extern void mmput(struct mm_struct *);

/* same as above but performs the slow path from the async kontext. Can

#ifdef CONFIG_MMU

/* same as above but performs the slow path from the async context. Can

 * be called from the atomic context as well

 */

extern void mmput_async(struct mm_struct *);

#endif



/* Grab a reference to a task's mm, if it is not already going away */

extern struct mm_struct *get_task_mm(struct task_struct *task);

kernel/fork.c

+2 −0
Original line number Diff line number Diff line
@@ -736,6 +736,7 @@ void mmput(struct mm_struct *mm) 
}

EXPORT_SYMBOL_GPL(mmput);



#ifdef CONFIG_MMU

static void mmput_async_fn(struct work_struct *work)

{

	struct mm_struct *mm = container_of(work, struct mm_struct, async_put_work);
@@ -749,6 +750,7 @@ void mmput_async(struct mm_struct *mm) 
		schedule_work(&mm->async_put_work);

	}

}

#endif



/**

 * set_mm_exe_file - change a reference to the mm's executable file

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