The patch titled
Subject: mm: oom_reaper: remove some bloat
has been added to the -mm tree. Its filename is
mm-oom_reaper-do-not-mmput-synchronously-from-the-oom-reaper-context-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-oom_reaper-do-not-mmput-synchronously-from-the-oom-reaper-context-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-oom_reaper-do-not-mmput-synchronously-from-the-oom-reaper-context-fix.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Michal Hocko <mhocko@xxxxxxxx>
Subject: 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.
Link: http://lkml.kernel.org/r/20160520061658.GB19172@xxxxxxxxxxxxxx
Reported-by: Minchan Kim <minchan@xxxxxxxxxx>
Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
Acked-by: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm_types.h | 2 ++
include/linux/sched.h | 2 ++
kernel/fork.c | 2 ++
3 files changed, 6 insertions(+)
diff -puN include/linux/mm_types.h~mm-oom_reaper-do-not-mmput-synchronously-from-the-oom-reaper-context-fix include/linux/mm_types.h
--- a/include/linux/mm_types.h~mm-oom_reaper-do-not-mmput-synchronously-from-the-oom-reaper-context-fix
+++ a/include/linux/mm_types.h
@@ -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)
diff -puN include/linux/sched.h~mm-oom_reaper-do-not-mmput-synchronously-from-the-oom-reaper-context-fix include/linux/sched.h
--- a/include/linux/sched.h~mm-oom_reaper-do-not-mmput-synchronously-from-the-oom-reaper-context-fix
+++ a/include/linux/sched.h
@@ -2740,10 +2740,12 @@ static inline bool mmget_not_zero(struct
/* mmput gets rid of the mappings and all user-space */
extern void mmput(struct mm_struct *);
+#ifdef CONFIG_MMU
/* same as above but performs the slow path from the async kontext. 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);
diff -puN kernel/fork.c~mm-oom_reaper-do-not-mmput-synchronously-from-the-oom-reaper-context-fix kernel/fork.c
--- a/kernel/fork.c~mm-oom_reaper-do-not-mmput-synchronously-from-the-oom-reaper-context-fix
+++ a/kernel/fork.c
@@ -731,6 +731,7 @@ 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);
@@ -744,6 +745,7 @@ 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
_
Patches currently in -mm which might be from mhocko@xxxxxxxx are
mm-oom_reaper-do-not-mmput-synchronously-from-the-oom-reaper-context-fix.patch
mm-make-mmap_sem-for-write-waits-killable-for-mm-syscalls.patch
mm-make-vm_mmap-killable.patch
mm-make-vm_munmap-killable.patch
mm-aout-handle-vm_brk-failures.patch
mm-elf-handle-vm_brk-error.patch
mm-make-vm_brk-killable.patch
mm-proc-make-clear_refs-killable.patch
mm-fork-make-dup_mmap-wait-for-mmap_sem-for-write-killable.patch
ipc-shm-make-shmem-attach-detach-wait-for-mmap_sem-killable.patch
vdso-make-arch_setup_additional_pages-wait-for-mmap_sem-for-write-killable.patch
coredump-make-coredump_wait-wait-for-mmap_sem-for-write-killable.patch
aio-make-aio_setup_ring-killable.patch
exec-make-exec-path-waiting-for-mmap_sem-killable.patch
prctl-make-pr_set_thp_disable-wait-for-mmap_sem-killable.patch
uprobes-wait-for-mmap_sem-for-write-killable.patch
drm-i915-make-i915_gem_mmap_ioctl-wait-for-mmap_sem-killable.patch
drm-radeon-make-radeon_mn_get-wait-for-mmap_sem-killable.patch
drm-amdgpu-make-amdgpu_mn_get-wait-for-mmap_sem-killable.patch
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