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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 9 Jul 2009 19:27:52 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...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

On Thu, Jul 9, 2009 at 4:20 PM, KOSAKI
Motohiro<kosaki.motohiro@...fujitsu.com> wrote:
>> > On Mon, 6 Jul 2009, Minchan Kim wrote:
>> >
>> > > Anyway, I think it's not a big cost in normal system.
>> > > So If you want to add new accounting, I don't have any objection. :)
>> >
>> > Lets keep the counters to a mininum. If we can calculate the values from
>> > something else then there is no justification for a new counter.
>> >
>> > A new counter increases the size of the per cpu structures that exist for
>> > each zone and each cpu. 1 byte gets multiplies by the number of cpus and
>> > that gets multiplied by the number of zones.
>>
>> OK. I'll implement this idea.
>
> Grr, sorry I cancel this opinion. Shem pages can't be calculated
> by minchan's formula.
>
> if those page are mlocked, the page move to unevictable lru. then
> this calculation don't account mlocked page. However mlocked tmpfs pages
> also make OOM issue.

Absolutely. You're right.
But In my opinion,  mlocked shmem pages are important ?
Now we care only number of unevictable pages but don't care what kinds
of pages there are in unevictable list.

What we need is to decode OOM more easily.
I think what kinds of pages there area unevictable lur list is not important.

-- 
Kind regards,
Minchan Kim
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/