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Date: Mon, 9 Nov 2015 01:40:16 +0200
From: "Kirill A. Shutemov" <kirill@shutemov.name>
Subject: Re: [PATCH 4/4] mm: prepare page_referenced() and page_idle to new
 THP refcounting
Message-ID: <20151108234016.GC29600@node.shutemov.name>
References: <1446564375-72143-1-git-send-email-kirill.shutemov@linux.intel.com>
 <1446564375-72143-5-git-send-email-kirill.shutemov@linux.intel.com>
 <20151105163211.608eec970de21a95faf6e156@linux-foundation.org>
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To: Andrew Morton <akpm@linux-foundation.org>
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>

On Fri, Nov 06, 2015 at 02:39:00PM -0800, Andrew Morton wrote:
> 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.

Here it is.