linux-kernel - Re: [PATCH mm-unstable v2 0/3] mm/hugetlb: alloc/free gigantic folios

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Message-ID: <b4cbb2e8-bc21-4af7-b092-081201302033@oracle.com>
Date: Fri, 30 Aug 2024 10:55:05 -0700
From: jane.chu@...cle.com
To: Yu Zhao <yuzhao@...gle.com>, Andrew Morton <akpm@...ux-foundation.org>,
        Muchun Song <muchun.song@...ux.dev>
Cc: "Matthew Wilcox (Oracle)" <willy@...radead.org>, Zi Yan <ziy@...dia.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH mm-unstable v2 0/3] mm/hugetlb: alloc/free gigantic folios

On 8/13/2024 8:54 PM, Yu Zhao wrote:

> Use __GFP_COMP for gigantic folios can greatly reduce not only the
> amount of code but also the allocation and free time.
>
> Approximate LOC to mm/hugetlb.c: +60, -240
>
> Allocate and free 500 1GB hugeTLB memory without HVO by:

Do you also have numbers with HVO enabled ?

>    time echo 500 >/sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages
>    time echo 0 >/sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages
>
>         Before  After
> Alloc  ~13s    ~10s
> Free   ~15s    <1s
>
Thanks,

-jane