linux-kernel - Re: [RFC PATCH] fs: introduce ST_HUGE flag and set it to tmpfs and hugetlbfs

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Message-ID: <20180419090119.5p5vos3vm57epr2j@node.shutemov.name>
Date:   Thu, 19 Apr 2018 12:01:19 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     Yang Shi <yang.shi@...ux.alibaba.com>, viro@...iv.linux.org.uk,
        nyc@...omorphy.com, kirill.shutemov@...ux.intel.com,
        hughd@...gle.com, akpm@...ux-foundation.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] fs: introduce ST_HUGE flag and set it to tmpfs and
 hugetlbfs

On Wed, Apr 18, 2018 at 01:26:35PM -0700, Mike Kravetz wrote:
> If an application would want to take advantage of this flag for tmpfs, it
> needs to map at a fixed address (MAP_FIXED) for huge page alignment.  So,
> it will need to do one of the 'mmap tricks' to get a mapping at a suitably
> aligned address.  

We don't need MAP_FIXED. We already have all required magic in
shmem_get_unmapped_area().

-- 
 Kirill A. Shutemov