Re: echo 0 > /proc/sys/vm/swappiness triggers OOM killer under 2.6.14.

[Robert Hancock]

Rob Landley wrote:
> > > Under 2.6.14 (UML), I have a workload that runs with 64 megs ram and 256
> > > megs swap space.  It completes (albeit swapping like mad) with swappiness
> > > at the default 60, but if I set it to 0 the OOM killer kicks in and the
> > > script aborts.
> >
> > You should get some debugging output in dmesg when the OOM killer kicks
> > in, can you post this?

> oom-killer: gfp_mask=0x400d2, order=0

OK, nothing really special about this..

> Free pages:        1416kB (0kB HighMem)
> Active:14014 inactive:718 dirty:1 writeback:0 unstable:0 free:354 slab:468 
> mapped:14722 pagetables:58
> DMA free:1416kB min:1024kB low:1280kB high:1536kB active:56056kB 
> inactive:2872kB present:65536kB pages_scanned:26577 all_unreclaimable? no

It looks like some memory is available here, but likely some UML person 
would have to say for sure..

> Out of Memory: Killed process 30055 (cc1).
> Badness in handle_page_fault 
> at /home/landley/newbuild/firmware-build/tmpdir/linux-2.6.14/arch/um/kernel/trap_kern.c:98

You likely need a UML person for this part too :-)

--
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@xxxxxxxxxxxxx
Home Page: http://www.roberthancock.com/

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