Date: Fri, 6 Nov 2015 14:39:00 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Hugh Dickins <hughd@google.com>,
        Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
        Sasha Levin <sasha.levin@oracle.com>, Minchan Kim <minchan@kernel.org>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        Vladimir Davydov <vdavydov@parallels.com>
Subject: Re: [PATCH 4/4] mm: prepare page_referenced() and page_idle to new
 THP refcounting
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On Fri, 6 Nov 2015 12:29:21 +0200 "Kirill A. Shutemov" <kirill@shutemov.name> wrote:

> > page_mapcount() is getting pretty bad too.
> 
> Do you want me to uninline slow path (PageCompound())?

I guess so.  Uninlining all of page_mapcount() does this:

gcc-4.4.4:

   text    data     bss     dec     hex filename
 973702  273954  831512 2079168  1fb9c0 mm/built-in.o-before
 970148  273954  831000 2075102  1fa9de mm/built-in.o-after

That's quite a bit of bloat.

I don't know why bss changed; this usually (always?) happens.  Seems
bogus.
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