Messages in this thread | | | Subject | Re: [PATCHv3] mm: Account pud page tables | From | Vlastimil Babka <> | Date | Wed, 4 Oct 2017 08:03:47 +0200 |
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On 10/02/2017 10:04 AM, Kirill A. Shutemov wrote: > On machine with 5-level paging support a process can allocate > significant amount of memory and stay unnoticed by oom-killer and > memory cgroup. The trick is to allocate a lot of PUD page tables. > We don't account PUD page tables, only PMD and PTE. > > We already addressed the same issue for PMD page tables, see > dc6c9a35b66b ("mm: account pmd page tables to the process"). > Introduction 5-level paging bring the same issue for PUD page tables. > > The patch expands accounting to PUD level. > > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> > Cc: Michal Hocko <mhocko@suse.com> > Cc: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Small fix below:
> --- a/fs/proc/task_mmu.c > +++ b/fs/proc/task_mmu.c > @@ -25,7 +25,7 @@ > > void task_mem(struct seq_file *m, struct mm_struct *mm) > { > - unsigned long text, lib, swap, ptes, pmds, anon, file, shmem; > + unsigned long text, lib, swap, ptes, pmds, puds, anon, file, shmem; > unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss; > > anon = get_mm_counter(mm, MM_ANONPAGES); > @@ -51,6 +51,7 @@ void task_mem(struct seq_file *m, struct mm_struct *mm) > swap = get_mm_counter(mm, MM_SWAPENTS); > ptes = PTRS_PER_PTE * sizeof(pte_t) * atomic_long_read(&mm->nr_ptes); > pmds = PTRS_PER_PMD * sizeof(pmd_t) * mm_nr_pmds(mm); > + puds = PTRS_PER_PUD * sizeof(pmd_t) * mm_nr_puds(mm);
^ pud_t ?
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