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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2017-02-23 02:46:39 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-02-23 03:41:30 +0300
commit235190738aba7c5c94300c8d882842a535280e5a (patch)
tree248190ec7e28752ff5971bf9be7dcb9a1b3faefe
parentecf1385d72f0491400a8ceca7001196ca369aa8c (diff)
downloadlinux-235190738aba7c5c94300c8d882842a535280e5a.tar.xz
oom-reaper: use madvise_dontneed() logic to decide if unmap the VMA
Logic on whether we can reap pages from the VMA should match what we have in madvise_dontneed(). In particular, we should skip, VM_PFNMAP VMAs, but we don't now. Let's just extract condition on which we can shoot down pagesi from a VMA with MADV_DONTNEED into separate function and use it in both places. Link: http://lkml.kernel.org/r/20170118122429.43661-4-kirill.shutemov@linux.intel.com Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/internal.h5
-rw-r--r--mm/madvise.c4
-rw-r--r--mm/oom_kill.c9
3 files changed, 9 insertions, 9 deletions
diff --git a/mm/internal.h b/mm/internal.h
index 9ad04fc6eefe..8ab72f4374e0 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -43,6 +43,11 @@ int do_swap_page(struct vm_fault *vmf);
void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
unsigned long floor, unsigned long ceiling);
+static inline bool can_madv_dontneed_vma(struct vm_area_struct *vma)
+{
+ return !(vma->vm_flags & (VM_LOCKED|VM_HUGETLB|VM_PFNMAP));
+}
+
void unmap_page_range(struct mmu_gather *tlb,
struct vm_area_struct *vma,
unsigned long addr, unsigned long end,
diff --git a/mm/madvise.c b/mm/madvise.c
index 7f1490f0d3a6..b530a4986035 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -25,6 +25,8 @@
#include <asm/tlb.h>
+#include "internal.h"
+
/*
* Any behaviour which results in changes to the vma->vm_flags needs to
* take mmap_sem for writing. Others, which simply traverse vmas, need
@@ -474,7 +476,7 @@ static long madvise_dontneed(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
*prev = vma;
- if (vma->vm_flags & (VM_LOCKED|VM_HUGETLB|VM_PFNMAP))
+ if (!can_madv_dontneed_vma(vma))
return -EINVAL;
madvise_userfault_dontneed(vma, prev, start, end);
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index a1977247c7ea..8256788ac119 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -508,14 +508,7 @@ static bool __oom_reap_task_mm(struct task_struct *tsk, struct mm_struct *mm)
tlb_gather_mmu(&tlb, mm, 0, -1);
for (vma = mm->mmap ; vma; vma = vma->vm_next) {
- if (is_vm_hugetlb_page(vma))
- continue;
-
- /*
- * mlocked VMAs require explicit munlocking before unmap.
- * Let's keep it simple here and skip such VMAs.
- */
- if (vma->vm_flags & VM_LOCKED)
+ if (!can_madv_dontneed_vma(vma))
continue;
/*