The patch titled
Subject: mm: delete unused MMF_OOM_VICTIM flag
has been added to the -mm mm-unstable branch. Its filename is
mm-delete-unused-mmf_oom_victim-flag.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-delete-unused-mmf_oom_victim-flag.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Subject: mm: delete unused MMF_OOM_VICTIM flag
Date: Tue, 31 May 2022 15:31:00 -0700
With the last usage of MMF_OOM_VICTIM in exit_mmap gone, this flag is now
unused and can be removed.
Link: https://lkml.kernel.org/r/20220531223100.510392-2-surenb@xxxxxxxxxx
Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Roman Gushchin <guro@xxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: "Kirill A . Shutemov" <kirill@xxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Christian Brauner (Microsoft) <brauner@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Jann Horn <jannh@xxxxxxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Cc: Liam Howlett <liam.howlett@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/oom.h | 9 ---------
include/linux/sched/coredump.h | 7 +++----
mm/oom_kill.c | 4 +---
3 files changed, 4 insertions(+), 16 deletions(-)
--- a/include/linux/oom.h~mm-delete-unused-mmf_oom_victim-flag
+++ a/include/linux/oom.h
@@ -78,15 +78,6 @@ static inline bool tsk_is_oom_victim(str
}
/*
- * 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
* address space which is reflected by MMF_UNSTABLE flag set in
--- a/include/linux/sched/coredump.h~mm-delete-unused-mmf_oom_victim-flag
+++ a/include/linux/sched/coredump.h
@@ -71,9 +71,8 @@ static inline int get_dumpable(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 */
+#define MMF_OOM_REAP_QUEUED 25 /* mm was queued for oom_reaper */
+#define MMF_MULTIPROCESS 26 /* mm is shared between processes */
/*
* MMF_HAS_PINNED: Whether this mm has pinned any pages. This can be either
* replaced in the future by mm.pinned_vm when it becomes stable, or grow into
@@ -81,7 +80,7 @@ static inline int get_dumpable(struct mm
* pinned pages were unpinned later on, we'll still keep this bit set for the
* lifecycle of this mm, just for simplicity.
*/
-#define MMF_HAS_PINNED 28 /* FOLL_PIN has run, never cleared */
+#define MMF_HAS_PINNED 27 /* FOLL_PIN has run, never cleared */
#define MMF_DISABLE_THP_MASK (1 << MMF_DISABLE_THP)
#define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK |\
--- a/mm/oom_kill.c~mm-delete-unused-mmf_oom_victim-flag
+++ a/mm/oom_kill.c
@@ -765,10 +765,8 @@ static void mark_oom_victim(struct task_
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
_
Patches currently in -mm which might be from surenb@xxxxxxxxxx are
mm-drop-oom-code-from-exit_mmap.patch
mm-delete-unused-mmf_oom_victim-flag.patch
