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Groups > linux.kernel > #1193566 > unrolled thread

hugetlb pages not accounted for in rss

Started byMike Kravetz <mike.kravetz@oracle.com>
First post2015-07-28 01:30 +0200
Last post2015-08-04 07:20 +0200
Articles 5 — 3 participants

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  hugetlb pages not accounted for in rss Mike Kravetz <mike.kravetz@oracle.com> - 2015-07-28 01:30 +0200
    Re: hugetlb pages not accounted for in rss Mike Kravetz <mike.kravetz@oracle.com> - 2015-07-28 23:20 +0200
      Re: hugetlb pages not accounted for in rss Jörn Engel <joern@purestorage.com> - 2015-07-29 03:00 +0200
        Re: hugetlb pages not accounted for in rss Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> - 2015-08-04 05:00 +0200
          [PATCH] smaps: fill missing fields for vma(VM_HUGETLB) Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> - 2015-08-04 07:20 +0200

#1193566 — hugetlb pages not accounted for in rss

FromMike Kravetz <mike.kravetz@oracle.com>
Date2015-07-28 01:30 +0200
Subjecthugetlb pages not accounted for in rss
Message-ID<pR00h-8jZ-3@gated-at.bofh.it>
I started looking at the hugetlb self tests.  The test hugetlbfstest
expects hugetlb pages to be accounted for in rss.  However, there is
no code in the kernel to do this accounting.

It looks like there was an effort to add the accounting back in 2013.
The test program made it into tree, but the accounting code did not.

The easiest way to resolve this issue would be to remove the test and
perhaps document that hugetlb pages are not accounted for in rss.
However, it does seem like a big oversight that hugetlb pages are not
accounted for in rss.  From a quick scan of the code it appears THP
pages are properly accounted for.

Thoughts?
-- 
Mike Kravetz
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#1194675

FromMike Kravetz <mike.kravetz@oracle.com>
Date2015-07-28 23:20 +0200
Message-ID<pRks2-4ju-11@gated-at.bofh.it>
In reply to#1193566
On 07/28/2015 11:32 AM, Jörn Engel wrote:
> On Mon, Jul 27, 2015 at 04:26:47PM -0700, Mike Kravetz wrote:
>> I started looking at the hugetlb self tests.  The test hugetlbfstest
>> expects hugetlb pages to be accounted for in rss.  However, there is
>> no code in the kernel to do this accounting.
>>
>> It looks like there was an effort to add the accounting back in 2013.
>> The test program made it into tree, but the accounting code did not.
>
> My apologies.  Upstream work always gets axed first when I run out of
> time - which happens more often than not.

No worries, I just noticed the inconsistency of the test program and
no supporting code in the kernel.

>> The easiest way to resolve this issue would be to remove the test and
>> perhaps document that hugetlb pages are not accounted for in rss.
>> However, it does seem like a big oversight that hugetlb pages are not
>> accounted for in rss.  From a quick scan of the code it appears THP
>> pages are properly accounted for.
>>
>> Thoughts?
>
> Unsurprisingly I agree that hugepages should count towards rss.  Keeping
> the test in keeps us honest.  Actually fixing the issue would make us
> honest and correct.
>
> Increasingly we have tiny processes (by rss) that actually consume large
> fractions of total memory.  Makes rss somewhat useless as a measure of
> anything.

I'll take a look at what it would take to get the accounting in place.
-- 
Mike Kravetz

>
> Jörn
>
> --
> Consensus is no proof!
> -- John Naisbitt
>
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#1194749

FromJörn Engel <joern@purestorage.com>
Date2015-07-29 03:00 +0200
Message-ID<pRnSV-Ns-1@gated-at.bofh.it>
In reply to#1194675
On Tue, Jul 28, 2015 at 04:30:19PM -0700, David Rientjes wrote:
> 
> It's not only the oom killer, I don't believe hugeltb pages are accounted 
> to the "rss" in memcg.  They use the hugetlb_cgroup for that.  Starting to 
> account for them in existing memcg deployments would cause them to hit 
> their memory limits much earlier.  The "rss_huge" field in memcg only 
> represents transparent hugepages.
> 
> I agree with your comment that having done this when hugetlbfs was 
> introduced would have been optimal.
> 
> It's always difficult to add a new class of memory to an existing metric 
> ("new" here because it's currently unaccounted).
> 
> If we can add yet another process metric to track hugetlbfs memory mapped, 
> then the test could be converted to use that.  I'm not sure if the 
> jusitifcation would be strong enough, but you could try.

Well, we definitely need something.  Having a 100GB process show 3GB of
rss is not very useful.  How would we notice a memory leak if it only
affects hugepages, for example?

Jörn

--
The object-oriented version of 'Spaghetti code' is, of course, 'Lasagna code'.
(Too many layers).
-- Roberto Waltman.
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#1199389

FromNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Date2015-08-04 05:00 +0200
Message-ID<pTACl-5Ra-3@gated-at.bofh.it>
In reply to#1194749
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#1199413 — [PATCH] smaps: fill missing fields for vma(VM_HUGETLB)

FromNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Date2015-08-04 07:20 +0200
Subject[PATCH] smaps: fill missing fields for vma(VM_HUGETLB)
Message-ID<pTCNQ-Kb-7@gated-at.bofh.it>
In reply to#1199389
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