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    SubjectRe: 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@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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