linux-kernel - Re: [PATCH 5/6] memcg: remove PCG_FILE

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Date:	Mon, 20 Feb 2012 08:52:38 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Hillf Danton <dhillf@...il.com>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.cz>, Hugh Dickins <hughd@...gle.com>,
	Greg Thelen <gthelen@...gle.com>
Subject: Re: [PATCH 5/6] memcg: remove PCG_FILE_MAPPED

On Sat, 18 Feb 2012 22:43:58 +0800
Hillf Danton <dhillf@...il.com> wrote:

> On Sat, Feb 18, 2012 at 9:39 PM, Johannes Weiner <hannes@...xchg.org> wrote:
> > On Fri, Feb 17, 2012 at 06:28:18PM +0900, KAMEZAWA Hiroyuki wrote:
> >> @@ -2559,7 +2555,7 @@ static int mem_cgroup_move_account(struct page *page,
> >>
> >>       move_lock_mem_cgroup(from, &flags);
> >>
> >> -     if (PageCgroupFileMapped(pc)) {
> >> +     if (page_mapped(page)) {
> >
> > As opposed to update_page_stat(), this runs against all types of
> > pages, so I think it should be
> >
> >        if (!PageAnon(page) && page_mapped(page))
> >
> > instead.
> >
> Perhaps the following helper or similar needed,
> along with page_mapped()
> 
> static inline bool page_is_file_mapping(struct page *page)
> {
> 	struct address_space *mapping = page_mapping(page);
> 
> 	return mapping && mapping != &swapper_space &&
> 		((unsigned long)mapping & PAGE_MAPPING_FLAGS) == 0;
> }
> 

Ah, thank you. I'll post a fix soon.

Ragard,
-Kame

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