Re: problems getting KSM running on newer 2.6.32.x kernels

[Nikola Ciprich <extmaillist@linuxbox.cz>]

Hi Avi, Izik,

today I spent some time investigating the problem and I've found the culprit:
RHEL5 glibc doesn't define MADV_MERGEABLE, so qemu-kvm didn't compile with KSM
support.
After I added -DMADV_MERGEABLE=12 -DMADV_UNMERGEABLE=13 CFLAGS,
things started to work.
Strange it worked for me before -  I don't remember using that kind of
hack before, but nevermind, it works now!

thanks and sorry for my fault.

have a nice day

nik

On Tue, Feb 09, 2010 at 03:02:17PM +0200, Izik Eidus wrote:
> On Tue, 09 Feb 2010 12:51:47 +0200
> Avi Kivity <avi@redhat.com> wrote:
> 
> > On 02/01/2010 12:37 PM, Nikola Ciprich wrote:
> > > Hello,
> > > it seems to me that after upgrading to some 2.6.32.x release, KSM stopped working
> > > for me. I'm not exactly sure which update did this, but enabling KSM doesn't
> > > seem to do anything, ksmd process just sleeps and doesn't merge any memory.
> > > Early 2.6.32 versions worked correctly for me, now I'm using 2.6.32.7 and qemu-kvm-0.12.2.
> > >
> > > I'm enabling it using:
> > >
> > > echo 262144>  /sys/kernel/mm/ksm/pages_to_scan
> > > echo 100>  /sys/kernel/mm/ksm/sleep_millisecs
> > > echo 1>  /sys/kernel/mm/ksm/run
> 
> Is it happen to you just in 2.6.32.x? what happen with 2.6.33.x?
> 
> I have tested it on 2.6.33.x and it seems to work...
> 
> > >
> > >    
> > 
> > Izik?
> > 
> 
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