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mm, oom: avoid reaping only for mm's with blockable invalidate callbacks 

This uses the new annotation to determine if an mm has mmu notifiers
with blockable invalidate range callbacks to avoid oom reaping.
Otherwise, the callbacks are used around unmap_page_range().

Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1712141330120.74052@chino.kir.corp.google.com
Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Dimitri Sivanich <sivanich@hpe.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Oded Gabbay <oded.gabbay@gmail.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Doug Ledford <dledford@redhat.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Mike Marciniszyn <mike.marciniszyn@intel.com>
Cc: Sean Hefty <sean.hefty@intel.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
David Rientjes 2018-01-31 16:18:36 -08:00 committed by Linus Torvalds
parent 5ff7091f5a
commit f340ff8203
1 changed files with 11 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
mm/oom_kill.c
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@ -514,15 +514,12 @@ static bool __oom_reap_task_mm(struct task_struct *tsk, struct mm_struct *mm)
}
/*
* If the mm has notifiers then we would need to invalidate them around
* unmap_page_range and that is risky because notifiers can sleep and
* what they do is basically undeterministic. So let's have a short
* If the mm has invalidate_{start,end}() notifiers that could block,
* sleep to give the oom victim some more time.
* TODO: we really want to get rid of this ugly hack and make sure that
* notifiers cannot block for unbounded amount of time and add
* mmu_notifier_invalidate_range_{start,end} around unmap_page_range
* notifiers cannot block for unbounded amount of time
*/
if (mm_has_notifiers(mm)) {
if (mm_has_blockable_invalidate_notifiers(mm)) {
up_read(&mm->mmap_sem);
schedule_timeout_idle(HZ);
goto unlock_oom;
@ -565,10 +562,14 @@ static bool __oom_reap_task_mm(struct task_struct *tsk, struct mm_struct *mm)
* count elevated without a good reason.
*/
if (vma_is_anonymous(vma) || !(vma->vm_flags & VM_SHARED)) {
tlb_gather_mmu(&tlb, mm, vma->vm_start, vma->vm_end);
unmap_page_range(&tlb, vma, vma->vm_start, vma->vm_end,
NULL);
tlb_finish_mmu(&tlb, vma->vm_start, vma->vm_end);
const unsigned long start = vma->vm_start;
const unsigned long end = vma->vm_end;
tlb_gather_mmu(&tlb, mm, start, end);
mmu_notifier_invalidate_range_start(mm, start, end);
unmap_page_range(&tlb, vma, start, end, NULL);
mmu_notifier_invalidate_range_end(mm, start, end);
tlb_finish_mmu(&tlb, start, end);
}
}
pr_info("oom_reaper: reaped process %d (%s), now anon-rss:%lukB, file-rss:%lukB, shmem-rss:%lukB\n",