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Subject: Re: [PATCH v8 2/8] hugetlb: restructure pool allocations
From:   Muchun Song <muchun.song@linux.dev>
In-Reply-To: <20231019023113.345257-3-mike.kravetz@oracle.com>
Date:   Thu, 19 Oct 2023 11:11:06 +0800
Cc:     Linux-MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>,
        Muchun Song <songmuchun@bytedance.com>,
        Joao Martins <joao.m.martins@oracle.com>,
        Konrad Dybcio <konradybcio@kernel.org>,
        Oscar Salvador <osalvador@suse.de>,
        David Hildenbrand <david@redhat.com>,
        Miaohe Lin <linmiaohe@huawei.com>,
        David Rientjes <rientjes@google.com>,
        Anshuman Khandual <anshuman.khandual@arm.com>,
        Naoya Horiguchi <naoya.horiguchi@linux.dev>,
        Barry Song <21cnbao@gmail.com>, Michal Hocko <mhocko@suse.com>,
        Matthew Wilcox <willy@infradead.org>,
        Xiongchun Duan <duanxiongchun@bytedance.com>,
        Sergey Senozhatsky <senozhatsky@chromium.org>,
        Usama Arif <usama.arif@bytedance.com>,
        Andrew Morton <akpm@linux-foundation.org>
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References: <20231019023113.345257-1-mike.kravetz@oracle.com>
 <20231019023113.345257-3-mike.kravetz@oracle.com>
To:     Mike Kravetz <mike.kravetz@oracle.com>
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> On Oct 19, 2023, at 10:31, Mike Kravetz <mike.kravetz@oracle.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@oracle.com>

The difference is small compared with v7. So

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

Thanks.