linux-kernel - Re: [PATCH 5/5] add NR_ANON

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Date:	Sun, 5 Jul 2009 22:19:47 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 5/5] add NR_ANON_PAGES to OOM log

>> > > + printk("%ld total anon pages\n", global_page_state(NR_ANON_PAGES));
>> > >   printk("%ld total pagecache pages\n", global_page_state(NR_FILE_PAGES));
>> >
>> > Can we put related items together, ie. this looks more friendly:
>> >
>> >         Anon:XXX active_anon:XXX inactive_anon:XXX
>> >         File:XXX active_file:XXX inactive_file:XXX
>>
>> hmmm. Actually NR_ACTIVE_ANON + NR_INACTIVE_ANON != NR_ANON_PAGES.
>> tmpfs pages are accounted as FILE, but it is stay in anon lru.
>
> Right, that's exactly the reason I propose to put them together: to
> make the number of tmpfs pages obvious.
>
>> I think your proposed format easily makes confusion. this format cause to
>> imazine Anon = active_anon + inactive_anon.
>
> Yes it may confuse normal users :(
>
>> At least, we need to use another name, I think.
>
> Hmm I find it hard to work out a good name.
>
> But instead, it may be a good idea to explicitly compute the tmpfs
> pages, because the excessive use of tmpfs pages could be a common
> reason of OOM.

Yeah,  explicite tmpfs/shmem accounting is also useful for /proc/meminfo.
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