linux-kernel - Re: Memory usage per memory zone

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Date:	Wed, 11 Mar 2009 20:26:11 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	jack marrow <jackmarrow2@...il.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: Memory usage per memory zone

On Wed, Mar 11, 2009 at 02:16:38PM +0200, jack marrow wrote:
> 2009/3/11 Wu Fengguang <fengguang.wu@...el.com>:
> > On Wed, Mar 11, 2009 at 01:51:32PM +0200, jack marrow wrote:
> >> 2009/3/11 Wu Fengguang <fengguang.wu@...el.com>:
> >> > Hi jack,
> >> >
> >> > On Wed, Mar 11, 2009 at 11:41:43AM +0100, jack marrow wrote:
> >> >> Hello,
> >> >>
> >> >> I have a box where the oom-killer is killing processes due to running
> >> >> out of memory in zone_normal. I can see using slabtop that the inode
> >> >
> >> > How do you know that the memory pressure on zone normal stand out alone?
> >>
> >> For the normal zone only, I see "all_unreclaimable: yes" and 3 megs of free ram:
> >>
> >> kernel: Normal free:2576kB min:3728kB low:7456kB high:11184kB
> >> active:1304kB inactive:128kB present:901120kB pages_scanned:168951
> >> all_unreclaimable? yes
> >
> > It's normal behavior.  Linux kernel tries hard to utilize most of
> > the free memory for caching files :)
> 
> With all_unreclaimable = yes is normal?

Ah, perhaps not.

Can you paste /proc/vmstat, /proc/meminfo, /proc/zoneinfo and
/proc/slabinfo? Thank you.

> >
> >> >> caches are using up lots of memory and guess this is the problem, so
> >> >> have cleared them using an echo to drop_caches.
> >> >
> >> > It would better be backed by concrete numbers...
> >> >
> >> >>
> >> >> I would quite like to not guess though - is it possible to use slabtop
> >> >> (or any other way) to view ram usage per zone so I can pick out the
> >> >> culprit?
> >> >
> >> > /proc/zoneinfo and /proc/vmstat do have some per-zone numbers.
> >> > Some of them deal with slabs.
> >>
> >> Thanks, I'll read up on how to interpret these.
> >>
> >> Do you recommend these two files for tracking down memory usage per
> >> process per zone?
> >
> > No, the two interfaces provide system wide counters.  We have the well
> > known tools "ps" and "top" for per-process numbers, hehe.
> 
> ps and top do not have per-zone numbers. How do I get those?

Maybe through the pagemap interface: Documentation/vm/pagemap.txt

Thanks,
Fengguang

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