linux-kernel - Re: [PATCH v8 2/8] hugetlb: restructure pool allocations

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Message-Id: <367C3465-B07D-402A-9647-9E0890130107@linux.dev>
Date:   Thu, 19 Oct 2023 11:11:06 +0800
From:   Muchun Song <muchun.song@...ux.dev>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     Linux-MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
        Muchun Song <songmuchun@...edance.com>,
        Joao Martins <joao.m.martins@...cle.com>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Oscar Salvador <osalvador@...e.de>,
        David Hildenbrand <david@...hat.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        David Rientjes <rientjes@...gle.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        Barry Song <21cnbao@...il.com>, Michal Hocko <mhocko@...e.com>,
        Matthew Wilcox <willy@...radead.org>,
        Xiongchun Duan <duanxiongchun@...edance.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Usama Arif <usama.arif@...edance.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v8 2/8] hugetlb: restructure pool allocations



> On Oct 19, 2023, at 10:31, Mike Kravetz <mike.kravetz@...cle.com> 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>

The difference is small compared with v7. So

Reviewed-by: Muchun Song <songmuchun@...edance.com>

Thanks.