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Re: mm: pages are not freed from lru_add_pvecs after process termination

From Vlastimil Babka <vbabka@suse.cz>
Newsgroups linux.kernel
Subject Re: mm: pages are not freed from lru_add_pvecs after process termination
Date 2016-05-02 17:20 +0200
Message-ID <runNE-5Nz-7@gated-at.bofh.it> (permalink)
References <rsB8m-4NH-5@gated-at.bofh.it> <rsBi2-4Sv-9@gated-at.bofh.it> <runkD-58W-33@gated-at.bofh.it> <runDY-5IL-11@gated-at.bofh.it>
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On 05/02/2016 05:01 PM, Kirill A. Shutemov wrote:
> On Mon, May 02, 2016 at 04:39:35PM +0200, Vlastimil Babka wrote:
>> On 04/27/2016 07:11 PM, Dave Hansen wrote:
>>> 6. Perhaps don't use the LRU pagevecs for large pages.  It limits the
>>>     severity of the problem.
>>
>> I think that makes sense. Being large already amortizes the cost per base
>> page much more than pagevecs do (512 vs ~22 pages?).
>
> We try to do this already, don't we? Any spefic case where we have THPs on
> pagevecs?

For example like this?
__do_huge_pmd_anonymous_page
   lru_cache_add_active_or_unevictable
     lru_cache_add

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Re: mm: pages are not freed from lru_add_pvecs after process  termination Vlastimil Babka <vbabka@suse.cz> - 2016-05-02 16:50 +0200
  Re: mm: pages are not freed from lru_add_pvecs after process  termination "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-05-02 17:10 +0200
    Re: mm: pages are not freed from lru_add_pvecs after process  termination Vlastimil Babka <vbabka@suse.cz> - 2016-05-02 17:20 +0200
    Re: mm: pages are not freed from lru_add_pvecs after process  termination Dave Hansen <dave.hansen@intel.com> - 2016-05-02 17:50 +0200
      Re: mm: pages are not freed from lru_add_pvecs after process  termination "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-05-02 18:10 +0200
        Re: mm: pages are not freed from lru_add_pvecs after process  termination Michal Hocko <mhocko@kernel.org> - 2016-05-03 09:40 +0200
          Re: mm: pages are not freed from lru_add_pvecs after process  termination "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-05-03 12:10 +0200

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