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Subject: Re: [PATCH v6 8/8] hugetlb: batch TLB flushes when restoring vmemmap
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From:   Muchun Song <muchun.song@linux.dev>
In-Reply-To: <20230925234837.86786-9-mike.kravetz@oracle.com>
Date:   Tue, 26 Sep 2023 10:20:09 +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>,
        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>,
        Andrew Morton <akpm@linux-foundation.org>
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 <20230925234837.86786-9-mike.kravetz@oracle.com>
To:     Mike Kravetz <mike.kravetz@oracle.com>
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> On Sep 26, 2023, at 07:48, Mike Kravetz <mike.kravetz@oracle.com> wrote:
> 
> Update the internal hugetlb restore vmemmap code path such that TLB
> flushing can be batched.  Use the existing mechanism of passing the
> VMEMMAP_REMAP_NO_TLB_FLUSH flag to indicate flushing should not be
> performed for individual pages.  The routine hugetlb_vmemmap_restore_folios
> is the only user of this new mechanism, and it will perform a global
> flush after all vmemmap is restored.
> 
> Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
> Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>

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

Thanks.