linux-kernel - Re: [PATCH v6 2/8] hugetlb: restructure pool allocations

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Date:   Mon, 2 Oct 2023 11:57:10 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Mike Kravetz <mike.kravetz@...cle.com>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        Xiongchun Duan <duanxiongchun@...edance.com>,
        Barry Song <21cnbao@...il.com>,
        David Rientjes <rientjes@...gle.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Matthew Wilcox <willy@...radead.org>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        Joao Martins <joao.m.martins@...cle.com>,
        David Hildenbrand <david@...hat.com>,
        Michal Hocko <mhocko@...e.com>,
        Oscar Salvador <osalvador@...e.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 2/8] hugetlb: restructure pool allocations



On 9/29/23 22:57, Mike Kravetz wrote:
> On 09/27/23 13:26, Konrad Dybcio wrote:
>>
>>
>> On 26.09.2023 01:48, Mike Kravetz wrote:
>>> Allocation of a hugetlb page for the hugetlb pool is done by the routine
>>> alloc_pool_huge_page.  This routine will allocate contiguous pages from
>>> a low level allocator, prep the pages for usage as a hugetlb page and
>>> then add the resulting hugetlb page to the pool.
>>>
>>> In the 'prep' stage, optional vmemmap optimization is done.  For
>>> performance reasons we want to perform vmemmap optimization on multiple
>>> hugetlb pages at once.  To do this, restructure the hugetlb pool
>>> allocation code such that vmemmap optimization can be isolated and later
>>> batched.
>>>
>>> The code to allocate hugetlb pages from bootmem was also modified to
>>> allow batching.
>>>
>>> No functional changes, only code restructure.
>>>
>>> Signed-off-by: Mike Kravetz <mike.kravetz@...cle.com>
>>> Reviewed-by: Muchun Song <songmuchun@...edance.com>
>>> ---
>> Hi, looks like this patch prevents today's next from booting
>> on at least one Qualcomm ARM64 platform. Reverting it makes
>> the device boot again.
> 
> Can you share the config used and any other specific information such as
> kernel command line.
Later this week.

Konrad