linux-kernel - Re: [PATCH] compaction: fix isolate_migratepages

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Message-Id: <20150428151420.227e7ac34745e9fe8e9bc145@linux-foundation.org>
Date:	Tue, 28 Apr 2015 15:14:20 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] compaction: fix isolate_migratepages_block() for THP=n

On Mon, 27 Apr 2015 14:26:46 +0300 "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> wrote:

> PageTrans* helpers are always-false if THP is disabled compile-time.
> It means the fucntion will fail to detect hugetlb pages in this case.
> 
> Let's use PageCompound() instead. With small tweak to how we calculate
> next low_pfn it will make function ready to see tail pages.

<scratches head>

So this patch has no runtime effects at present?  It is preparation for
something else?

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