Re: VM/VFS bug with large amount of memory and file systems?

Anton Altaparmakov
2007-09-15T10:50:42Z

Hi,

Thanks for looking into this.

On 15 Sep 2007, at 11:08, Peter Zijlstra wrote:
> On Sat, 2007-09-15 at 08:27 +0100, Anton Altaparmakov wrote:
>
> Please, don't word wrap log-files, they're hard enough to read without
> it :-(
>
> ( I see people do this more and more often, *WHY*? is that because we
> like 80 char lines, in code and email? )

I haven't word wrapped it at all. The lines appear as whole lines in
Apple Mail (my email client). It must be your email client that is
wrapping them...

> Anyway, looks like all of zone_normal is pinned in kernel allocations:
>
>> Sep 13 15:31:25 escabot Normal free:3648kB min:3744kB low:4680kB
>> high: 5616kB active:0kB inactive:3160kB present:894080kB
>> pages_scanned:5336 all_unreclaimable? yes
>
> Out of the 870 odd mb only 3 is on the lru.
>
> Would be grand it you could have a look at slabinfo and the like.

Ok, Marc, would you be able to do the copy to /dev/null again (booted
without the ram=2G option) and when you see that most of the memory
has gone run:

cat /proc/slabinfo > slabinfo.txt
cat /proc/meminfo > meminfo.txt
cat /proc/vmstat > vmstat.txt
cat /proc/zoneinfo > zoneinfo.txt

Then quickly abort the copy with "Ctrl+C" so hopefully you will not
get a kernel panic...

Please send the content of the generated files. Thanks.

That should hopefully show what in the kernel has eaten all the low
memory...

Best regards,

Anton
--
Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @)
Unix Support, Computing Service, University of Cambridge, CB2 3QH, UK
Linux NTFS maintainer, http://www.linux-ntfs.org/