Messages in this thread |  | | | Date | Wed, 11 Mar 2009 20:11:23 +0800 | | From | Wu Fengguang <> | | Subject | Re: Memory usage per memory zone |
| |
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 :)
> >> 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.
Thanks, Fengguang
|  |