linux-kernel - Re: [PATCH v3 1/3] mm: enable MADV

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Message-ID: <e4d6dc06-30cb-1f92-32a9-d9057bcbf6b0@intel.com>
Date:   Fri, 18 Feb 2022 08:39:44 +0800
From:   Yin Fengwei <fengwei.yin@...el.com>
To:     David Hildenbrand <david@...hat.com>,
        Mike Kravetz <mike.kravetz@...cle.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>
CC:     Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Mina Almasry <almasrymina@...gle.com>,
        "Michal Hocko" <mhocko@...e.com>, Peter Xu <peterx@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Shuah Khan <shuah@...nel.org>, Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v3 1/3] mm: enable MADV_DONTNEED for hugetlb mappings



On 2/17/2022 4:58 PM, David Hildenbrand wrote:
>> In man page of mmap, NOTE for "Huge page (Huge TLB) mappings":
>>
>> "For munmap(), addr, and length must both be a multiple of the 
>> underlying huge page size."
>>
>> Should we apply same rule to MADV_DONTNEED? Thanks.
> madvise() already has different rules than mmap() for ordinary pages, so
> we'd much rather try staying consistent with madvise() rules.

Thanks for clarification.

Regards
Yin, Fengwei