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From: Zi Yan <ziy@nvidia.com>
To: Roman Gushchin <guro@fb.com>
CC: <linux-mm@kvack.org>, Matthew Wilcox <willy@infradead.org>, "Kirill A .
 Shutemov" <kirill.shutemov@linux.intel.com>, Andrew Morton
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Subject: Re: [RFC PATCH v3 00/49] 1GB PUD THP support on x86_64
Date: Thu, 4 Mar 2021 11:26:03 -0500
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On 1 Mar 2021, at 20:59, Roman Gushchin wrote:

> On Wed, Feb 24, 2021 at 05:35:36PM -0500, Zi Yan wrote:
>> From: Zi Yan <ziy@nvidia.com>
>>
>> Hi all,
>>
>> I have rebased my 1GB PUD THP support patches on v5.11-mmotm-2021-02-1=
8-18-29
>> and the code is available at
>> https://github.com/x-y-z/linux-1gb-thp/tree/1gb_thp_v5.11-mmotm-2021-0=
2-18-18-29
>> if you want to give it a try. The actual 49 patches are not sent out w=
ith this
>> cover letter. :)
>>
>> Instead of asking for code review, I would like to discuss on the conc=
erns I got
>> from previous RFCs. I think there are two major ones:
>>
>> 1. 1GB page allocation. Current implementation allocates 1GB pages fro=
m CMA
>>    regions that are reserved at boot time like hugetlbfs. The concerns=
 on
>>    using CMA is that an educated guess is needed to avoid depleting ke=
rnel
>>    memory in case CMA regions are set too large. Recently David Rientj=
es
>>    proposes to use process_madvise() for hugepage collapse, which is a=
n
>>    alternative [1] but might not work for 1GB pages, since there is no=
 way of
>>    _allocating_ a 1GB page to which collapse pages. I proposed a simil=
ar
>>    approach at LSF/MM 2019, generating physically contiguous memory af=
ter pages
>>    are allocated [2], which is usable for 1GB THPs. This approach does=
 in-place
>>    huge page promotion thus does not require page allocation.
>
> Well, I don't think there an alternative to cma as now. When the memory=
 is almost
> filled at least once, any subsequent activity leading to substantial sl=
ab allocations
> (e.g. run git gc) will fragment the memory, so that there are virtually=
 no chances
> to find a continuous GB.
>
> It's possible in theory to reduce the fragmentation on 1GB scale by gro=
uping
> non-movable pageblocks, but it seems a separate project.

My experiments showed that finding continuous GBs is possible, but I agre=
e that
CMA is more reliable and 1GB scale defragmentation should be a separate p=
roject.


=E2=80=94
Best Regards,
Yan Zi

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=knea
-----END PGP SIGNATURE-----

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