On Tue, May 10, 2022 at 8:51 AM Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx> wrote:
>
> On 5/9/22 9:00 PM, Suren Baghdasaryan wrote:
> > With the last usage of MMF_OOM_VICTIM in exit_mmap gone, this flag is
> > now unused and can be removed.
> >
> > Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
> > ---
> > include/linux/oom.h | 9 ---------
> > include/linux/sched/coredump.h | 1 -
> > mm/oom_kill.c | 4 +---
> > 3 files changed, 1 insertion(+), 13 deletions(-)
> >
> > diff --git a/include/linux/oom.h b/include/linux/oom.h
> > index 6cdf0772dbae..25990e9d9e15 100644
> > --- a/include/linux/oom.h
> > +++ b/include/linux/oom.h
> > @@ -77,15 +77,6 @@ static inline bool tsk_is_oom_victim(struct task_struct * tsk)
> > return tsk->signal->oom_mm;
> > }
> >
> > -/*
> > - * Use this helper if tsk->mm != mm and the victim mm needs a special
> > - * handling. This is guaranteed to stay true after once set.
> > - */
> > -static inline bool mm_is_oom_victim(struct mm_struct *mm)
> > -{
> > - return test_bit(MMF_OOM_VICTIM, &mm->flags);
> > -}
> > -
> > /*
> > * Checks whether a page fault on the given mm is still reliable.
> > * This is no longer true if the oom reaper started to reap the
> > diff --git a/include/linux/sched/coredump.h b/include/linux/sched/coredump.h
> > index 4d9e3a656875..746f6cb07a20 100644
> > --- a/include/linux/sched/coredump.h
> > +++ b/include/linux/sched/coredump.h
> > @@ -70,7 +70,6 @@ static inline int get_dumpable(struct mm_struct *mm)
> > #define MMF_UNSTABLE 22 /* mm is unstable for copy_from_user */
> > #define MMF_HUGE_ZERO_PAGE 23 /* mm has ever used the global huge zero page */
> > #define MMF_DISABLE_THP 24 /* disable THP for all VMAs */
> > -#define MMF_OOM_VICTIM 25 /* mm is the oom victim */
> > #define MMF_OOM_REAP_QUEUED 26 /* mm was queued for oom_reaper */
> > #define MMF_MULTIPROCESS 27 /* mm is shared between processes */
> > /*
> > diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> > index 36355b162727..11291b99599f 100644
> > --- a/mm/oom_kill.c
> > +++ b/mm/oom_kill.c
> > @@ -732,10 +732,8 @@ static void mark_oom_victim(struct task_struct *tsk)
> > return;
> >
> > /* oom_mm is bound to the signal struct life time. */
> > - if (!cmpxchg(&tsk->signal->oom_mm, NULL, mm)) {
> > + if (!cmpxchg(&tsk->signal->oom_mm, NULL, mm))
> > mmgrab(tsk->signal->oom_mm);
> > - set_bit(MMF_OOM_VICTIM, &mm->flags);
> > - }
> >
> > /*
> > * Make sure that the task is woken up from uninterruptible sleep
> >
>
> Thank you for working on the new tests and cleanups.
Thanks for the review!
>
> This series needs a cover-letter that explains why this series is needed
> that includes the information from this last patch.
>
> Please send v2 with a proper cover letter starting with why this series
> is necessary. If you did that, it would have reviewers job is lot easier.
>
> Also it appears you are combining new tests with cleanup patches. I think
> patches 2/3 and 3/3 can be a separate series and the new test can be a
> separate patch.
I used the new selftest to test the patches but otherwise it's true,
they are unrelated. I was debating whether to send them separately and
with your blessing I'll split them up.
Thanks,
Suren.
>
> thanks,
> -- Shuah
