Messages in this thread | | | Date | Wed, 11 Mar 2009 20:26:11 +0800 | From | Wu Fengguang <> | Subject | Re: Memory usage per memory zone |
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On Wed, Mar 11, 2009 at 02:16:38PM +0200, jack marrow wrote: > 2009/3/11 Wu Fengguang <fengguang.wu@intel.com>: > > On Wed, Mar 11, 2009 at 01:51:32PM +0200, jack marrow wrote: > >> 2009/3/11 Wu Fengguang <fengguang.wu@intel.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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