linux-kernel - Re: [PATCH 3/3] mm: delete unused MMF_OOM

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Message-ID: <CAJuCfpGO0E82uY7vfhqeFNKeyxmrFa6PnbmwN6qgf68oAdzD_Q@mail.gmail.com>
Date:   Sun, 15 May 2022 19:46:23 -0700
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     Michal Hocko <mhocko@...e.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        David Rientjes <rientjes@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Roman Gushchin <guro@...com>, Minchan Kim <minchan@...nel.org>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Christian Brauner <brauner@...nel.org>,
        Christoph Hellwig <hch@...radead.org>,
        Oleg Nesterov <oleg@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Jann Horn <jannh@...gle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Peter Xu <peterx@...hat.com>,
        John Hubbard <jhubbard@...dia.com>, shuah@...nel.org,
        LKML <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>, linux-kselftest@...r.kernel.org,
        kernel-team <kernel-team@...roid.com>
Subject: Re: [PATCH 3/3] mm: delete unused MMF_OOM_VICTIM flag

On Tue, May 10, 2022 at 6:08 AM Michal Hocko <mhocko@...e.com> wrote:
>
> On Mon 09-05-22 20:00:14, 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@...gle.com>
>
> LGTM
> Acked-by: Michal Hocko <mhocko@...e.com>
>
> One question below
> [...]
> > 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 */
>
> Have you consider renumbering the follow up flags so that we do not have
> holes in there. Nothing really important but it can confuse somebody in
> the future.

Missed this note until now. I will renumber the constants to avoid confusion.
Thanks,
Suren.

>
> --
> Michal Hocko
> SUSE Labs