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Subject: Re: [PATCHv2 04/28] mm: make remove_migration_ptes() beyond
 mm/migration.c
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Hugh Dickins <hughd@google.com>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>
References: <1455200516-132137-1-git-send-email-kirill.shutemov@linux.intel.com>
 <1455200516-132137-5-git-send-email-kirill.shutemov@linux.intel.com>
Cc: Vlastimil Babka <vbabka@suse.cz>, Christoph Lameter <cl@gentwo.org>,
        Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
        Jerome Marchand <jmarchan@redhat.com>, Yang Shi <yang.shi@linaro.org>,
        Sasha Levin <sasha.levin@oracle.com>, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org
From: Dave Hansen <dave.hansen@intel.com>
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Date: Fri, 12 Feb 2016 08:54:58 -0800
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On 02/11/2016 06:21 AM, Kirill A. Shutemov wrote
> We also shouldn't try to mlock() pte-mapped huge pages: pte-mapeed THP
> pages are never mlocked.

That's kinda subtle.  Can you explain more?

If we did the following:

	ptr = mmap(NULL, 512*PAGE_SIZE, ...);
	mlock(ptr, 512*PAGE_SIZE);
	fork();
	munmap(ptr + 100 * PAGE_SIZE, PAGE_SIZE);

I'd expect to get two processes, each mapping the same compound THP, one
with a PMD and the other with 511 ptes and one hole.  Is there something
different that goes on?