From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Thu, 19 Apr 2018 12:01:19 +0300 From: "Kirill A. Shutemov" To: Mike Kravetz Cc: Yang Shi , viro@zeniv.linux.org.uk, nyc@holomorphy.com, kirill.shutemov@linux.intel.com, hughd@google.com, akpm@linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH] fs: introduce ST_HUGE flag and set it to tmpfs and hugetlbfs Message-ID: <20180419090119.5p5vos3vm57epr2j@node.shutemov.name> References: <1523999293-94152-1-git-send-email-yang.shi@linux.alibaba.com> <2804a1d0-9d68-ac43-3041-9490147b52b5@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2804a1d0-9d68-ac43-3041-9490147b52b5@oracle.com> Sender: owner-linux-mm@kvack.org List-ID: 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