Re: [PATCH 4/4] mm: prepare page_referenced() and page_idle to new THP refcounting

[Kirill A. Shutemov]

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@xxxxxxxxxxxxx> 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.