linux-kernel - Re: [PATCH 2/2] page cache: Store only head pages in i

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Message-ID: <20181123105643.fxqk7l57rdurdubx@kshutemo-mobl1>
Date:   Fri, 23 Nov 2018 13:56:44 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH 2/2] page cache: Store only head pages in i_pages

On Thu, Nov 22, 2018 at 01:32:24PM -0800, Matthew Wilcox wrote:
> Transparent Huge Pages are currently stored in i_pages as pointers to
> consecutive subpages.  This patch changes that to storing consecutive
> pointers to the head page in preparation for storing huge pages more
> efficiently in i_pages.

I probably miss something, I don't see how it wouldn't break
split_huge_page().

I don't see what would replace head pages in i_pages with
formerly-tail-pages?

Hm?

-- 
 Kirill A. Shutemov