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Message-ID: <ba5a528d-7e85-77a2-5096-5a143a3b1606@linaro.org>
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
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