Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1739039
| From | "Kirill A. Shutemov" <kirill@shutemov.name> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCHv2] mm: Account pud page tables |
| Date | 2017-09-25 15:10 +0200 |
| Message-ID | <utBj4-6Ms-19@gated-at.bofh.it> (permalink) |
| References | <utwjn-3iD-5@gated-at.bofh.it> <utAdk-5RX-17@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Mon, Sep 25, 2017 at 01:54:30PM +0200, Michal Hocko wrote:
> On Mon 25-09-17 10:39:13, 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.
>
> OK, we definitely need this or something like that but I really do not
> like how much code we actually need for each pte level for accounting.
> Do we really need to distinguish each level? Do we have any arch that
> would use a different number of pages to back pte/pmd/pud?
Looks like we actually do. At least on mips. See PMD_ORDER/PUD_ORDER.
--
Kirill A. Shutemov
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
[PATCHv2] mm: Account pud page tables "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2017-09-25 09:50 +0200
Re: [PATCHv2] mm: Account pud page tables Michal Hocko <mhocko@kernel.org> - 2017-09-25 14:00 +0200
Re: [PATCHv2] mm: Account pud page tables "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-09-25 15:10 +0200
Re: [PATCHv2] mm: Account pud page tables Michal Hocko <mhocko@kernel.org> - 2017-09-25 16:00 +0200
Re: [PATCHv2] mm: Account pud page tables "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-09-26 11:50 +0200
Re: [PATCHv2] mm: Account pud page tables Michal Hocko <mhocko@kernel.org> - 2017-09-26 12:20 +0200
Re: [PATCHv2] mm: Account pud page tables Michal Hocko <mhocko@kernel.org> - 2017-09-26 12:20 +0200
csiph-web