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

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Message-ID: <CAJd=RBD=U1Uy_MnO9wL_Ag6M7tYUOfs=aSXV+sJabHWRNSSudQ@mail.gmail.com>
Date:	Sat, 18 Feb 2012 22:43:58 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"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, 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;
}

>>               /* Update mapped_file data for mem_cgroup */
>>               preempt_disable();
>>               __this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
--
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