From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: zhong jiang <zhongjiang@huawei.com>
Cc: kirill.shutemov@linux.intel.com, Mel Gorman <mgorman@suse.de>,
Michal Hocko <mhocko@suse.cz>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: A question about transparent hugepages
Date: Thu, 4 Aug 2016 12:16:01 +0300 [thread overview]
Message-ID: <20160804091601.GA12395@node.shutemov.name> (raw)
In-Reply-To: <57A2BE55.1020302@huawei.com>
On Thu, Aug 04, 2016 at 12:02:29PM +0800, zhong jiang wrote:
> according to the total_mapcount, Different process can map any subpages of the
> transparent hugepages. How it can happen to ?
For anonymous memory it can only happen over copy-on-write via fork() +
munmap() or something in one of the processes.
Now we have tmpfs/shmem with huge pages in mainline. In this case you can
map any subpage directly from file.
--
Kirill A. Shutemov
prev parent reply other threads:[~2016-08-04 9:16 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-04 4:02 A question about transparent hugepages zhong jiang
2016-08-04 9:16 ` Kirill A. Shutemov [this message]
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