[Qemu-devel] [Bug 648356] Re: VirtFS possible memory leak in 9p virtio mapped

[Moshroum]

** Description changed:

  I use as client Debian squeeze i386 with a custom kernel:
  Linux (none) 2.6.35.5 #3 Thu Sep 23 18:36:02 UTC 2010 i686 GNU/Linux
  
  And as host Debian squeeze amd64
  Linux asd 2.6.32-5-amd64 #1 SMP Fri Sep 17 21:50:19 UTC 2010 x86_64 GNU/Linux
  
  kvm version is:
  kvm-88-5908-gdd67374
  
  Started the client using:
  sudo /usr/local/kvm/bin/qemu-system-x86_64 -m 1024 -kernel 
linux-2.6.35.5.qemu -drive file=root.img,if=virtio -net 
nic,macaddr=02:ca:ff:ee:ba:be,model=virtio,vlan=1 -net 
tap,ifname=tap1,vlan=1,script=no -virtfs 
local,path=/host,security_model=mapped,mount_tag=host -nographic
  
- 
  I've done following inside the guest:
  
  $  mount -t 9p -o trans=virtio host /mnt
  $ rm -f /mnt/test
  $ touch /mnt/test
  $ ls -l /mnt/test
- $ while true ;do ls -l /host/test > /dev/null; done
+ $ while true ;do ls -l /mnt/test > /dev/null; done
  
  Now I can see on my host system that the memory consumption starts at
  90MB and after a minute it raises to 130MB.  The extra memory
  consumption stops when I stop the while-loop.
  
  $ while true ;do ls -l /tmp > /dev/null; done
  
  Doesn't show that behaviour.

-- 
VirtFS possible memory leak in 9p virtio mapped
https://bugs.launchpad.net/bugs/648356
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Status in QEMU: New

Bug description:
I use as client Debian squeeze i386 with a custom kernel:
Linux (none) 2.6.35.5 #3 Thu Sep 23 18:36:02 UTC 2010 i686 GNU/Linux

And as host Debian squeeze amd64
Linux asd 2.6.32-5-amd64 #1 SMP Fri Sep 17 21:50:19 UTC 2010 x86_64 GNU/Linux

kvm version is:
kvm-88-5908-gdd67374

Started the client using:
sudo /usr/local/kvm/bin/qemu-system-x86_64 -m 1024 -kernel linux-2.6.35.5.qemu 
-drive file=root.img,if=virtio -net 
nic,macaddr=02:ca:ff:ee:ba:be,model=virtio,vlan=1 -net 
tap,ifname=tap1,vlan=1,script=no -virtfs 
local,path=/host,security_model=mapped,mount_tag=host -nographic

I've done following inside the guest:

$  mount -t 9p -o trans=virtio host /mnt
$ rm -f /mnt/test
$ touch /mnt/test
$ ls -l /mnt/test
$ while true ;do ls -l /mnt/test > /dev/null; done

Now I can see on my host system that the memory consumption starts at 90MB and 
after a minute it raises to 130MB.  The extra memory consumption stops when I 
stop the while-loop.

$ while true ;do ls -l /tmp > /dev/null; done

Doesn't show that behaviour.