[libvirt] 'dommemstat' is not working for LXC hypervisor.
Hi Daniel, I am using libvirt version 0.8.0. I created a domain 'srikanth_vm' using 'lxc' hypervisor. I am able to start the Domain. But, I am not able to get the memory stats for that Domain. If I issue 'dommemstat Srikanth_vm' in the virsh console, the following error is throwing: error: Failed to get memory statistics for domain srikanth_vm error: this function is not supported by the hypervisor: virDomainMemoryStats Can you please let me know, how can I get memory stats for a particular domain in libvirt? Regards, Srikanth.
On Wed, Apr 28, 2010 at 12:00:09PM +0530, Kumar L Srikanth-B22348 wrote:
Hi Daniel,
I am using libvirt version 0.8.0. I created a domain 'srikanth_vm' using 'lxc' hypervisor. I am able to start the Domain. But, I am not able to get the memory stats for that Domain.
If I issue 'dommemstat Srikanth_vm' in the virsh console, the following error is throwing:
error: Failed to get memory statistics for domain srikanth_vm
error: this function is not supported by the hypervisor: virDomainMemoryStats
That is expected - no one has implemented the dommemstat API for the LXC driver yet, though it should be really quiet easy todo so. All the info should be available already via the memory cgroup controller
Can you please let me know, how can I get memory stats for a particular domain in libvirt?
The virDomainGetInfo API / virhs dominfo command shows you the overall allocated memory. The dommemstats command gives you a finer breakdown of usage of that memory by the guest Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
Thanks for the reply Daniel. Virsh dominfo dommand showing following results: Id: 32473 Name: vm1 UUID: f13bc513-15f2-1dd1-74f6-18c47931ece9 OS Type: exe State: running CPU(s): 1 Max memory: 5000000 kB Used memory: 5000000 kB Autostart: disable Though whatever services running on the domain, every time used memory is showing as 5000000 kB. Is that result is correct? Regards, Srikanth. -----Original Message----- From: Daniel P. Berrange [mailto:berrange@redhat.com] Sent: Wednesday, April 28, 2010 4:10 PM To: Kumar L Srikanth-B22348 Cc: libvir-list@redhat.com Subject: Re: 'dommemstat' is not working for LXC hypervisor. On Wed, Apr 28, 2010 at 12:00:09PM +0530, Kumar L Srikanth-B22348 wrote:
Hi Daniel,
I am using libvirt version 0.8.0. I created a domain 'srikanth_vm' using 'lxc' hypervisor. I am able to start the Domain. But, I am not able to get the memory stats for that Domain.
If I issue 'dommemstat Srikanth_vm' in the virsh console, the following error is throwing:
error: Failed to get memory statistics for domain srikanth_vm
error: this function is not supported by the hypervisor: virDomainMemoryStats
That is expected - no one has implemented the dommemstat API for the LXC driver yet, though it should be really quiet easy todo so. All the info should be available already via the memory cgroup controller
Can you please let me know, how can I get memory stats for a particular domain in libvirt?
The virDomainGetInfo API / virhs dominfo command shows you the overall allocated memory. The dommemstats command gives you a finer breakdown of usage of that memory by the guest Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
On Wed, Apr 28, 2010 at 04:43:41PM +0530, Kumar L Srikanth-B22348 wrote:
Thanks for the reply Daniel. Virsh dominfo dommand showing following results:
Id: 32473 Name: vm1 UUID: f13bc513-15f2-1dd1-74f6-18c47931ece9 OS Type: exe State: running CPU(s): 1 Max memory: 5000000 kB Used memory: 5000000 kB Autostart: disable
Though whatever services running on the domain, every time used memory is showing as 5000000 kB. Is that result is correct?
The 'Max memory' 5000000 KB is the hard limit that is allocated to the container. I thought that the 'used memory' field would be lower, but its possible we don't have the actual stats for used memory so just set both the same. I'd have to research the code again to answer for sure... Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
Daniel, My requirement is to get how much memory is free in the guest domain. Can you please let me know, how can I do that? And also, as you said it's quite easy to implement dommemstats for lxc driver, is there any possibility to implement that? Regards, Srikanth. -----Original Message----- From: Daniel P. Berrange [mailto:berrange@redhat.com] Sent: Wednesday, April 28, 2010 4:46 PM To: Kumar L Srikanth-B22348 Cc: libvir-list@redhat.com Subject: Re: 'dommemstat' is not working for LXC hypervisor. On Wed, Apr 28, 2010 at 04:43:41PM +0530, Kumar L Srikanth-B22348 wrote:
Thanks for the reply Daniel. Virsh dominfo dommand showing following results:
Id: 32473 Name: vm1 UUID: f13bc513-15f2-1dd1-74f6-18c47931ece9 OS Type: exe State: running CPU(s): 1 Max memory: 5000000 kB Used memory: 5000000 kB Autostart: disable
Though whatever services running on the domain, every time used memory
is showing as 5000000 kB. Is that result is correct?
The 'Max memory' 5000000 KB is the hard limit that is allocated to the container. I thought that the 'used memory' field would be lower, but its possible we don't have the actual stats for used memory so just set both the same. I'd have to research the code again to answer for sure... Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
On Wed, Apr 28, 2010 at 8:19 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Daniel, My requirement is to get how much memory is free in the guest domain. Can you please let me know, how can I do that?
Do you enable cgroup memory subsystem? If so, something wrong in lxc driver of 0.8.0. BTW, 'Used memory' includes both RSS and caches, so if you need total-RSS value, you should use dommemstat.
And also, as you said it's quite easy to implement dommemstats for lxc driver, is there any possibility to implement that?
We can get statistics of dommemstat easily through memory.stat of cgroup.memory subsystem except statistics of page faults. ozaki-r
Regards, Srikanth.
-----Original Message----- From: Daniel P. Berrange [mailto:berrange@redhat.com] Sent: Wednesday, April 28, 2010 4:46 PM To: Kumar L Srikanth-B22348 Cc: libvir-list@redhat.com Subject: Re: 'dommemstat' is not working for LXC hypervisor.
On Wed, Apr 28, 2010 at 04:43:41PM +0530, Kumar L Srikanth-B22348 wrote:
Thanks for the reply Daniel. Virsh dominfo dommand showing following results:
Id: 32473 Name: vm1 UUID: f13bc513-15f2-1dd1-74f6-18c47931ece9 OS Type: exe State: running CPU(s): 1 Max memory: 5000000 kB Used memory: 5000000 kB Autostart: disable
Though whatever services running on the domain, every time used memory
is showing as 5000000 kB. Is that result is correct?
The 'Max memory' 5000000 KB is the hard limit that is allocated to the container. I thought that the 'used memory' field would be lower, but its possible we don't have the actual stats for used memory so just set both the same. I'd have to research the code again to answer for sure...
Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
-- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
Thanks ozaki. But can you please elaborate the process of getting memory.stat of a particular domain? I mounted cgroup filesystem prior to start libvirtd service using the below command: mount -t cgroup cgroup /cgroup Then started libvirtd service. Then started the domain. Here, can you let me know the process of viewing memory stats of that particular domain? By the way, in the /cgroup directory lot of files are created. In those, which one can be memory stats? Regards, Srikanth. -----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 5:27 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor. On Wed, Apr 28, 2010 at 8:19 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Daniel, My requirement is to get how much memory is free in the guest domain. Can you please let me know, how can I do that?
Do you enable cgroup memory subsystem? If so, something wrong in lxc driver of 0.8.0. BTW, 'Used memory' includes both RSS and caches, so if you need total-RSS value, you should use dommemstat.
And also, as you said it's quite easy to implement dommemstats for lxc driver, is there any possibility to implement that?
We can get statistics of dommemstat easily through memory.stat of cgroup.memory subsystem except statistics of page faults. ozaki-r
Regards, Srikanth.
-----Original Message----- From: Daniel P. Berrange [mailto:berrange@redhat.com] Sent: Wednesday, April 28, 2010 4:46 PM To: Kumar L Srikanth-B22348 Cc: libvir-list@redhat.com Subject: Re: 'dommemstat' is not working for LXC hypervisor.
On Wed, Apr 28, 2010 at 04:43:41PM +0530, Kumar L Srikanth-B22348 wrote:
Thanks for the reply Daniel. Virsh dominfo dommand showing following results:
Id: 32473 Name: vm1 UUID: f13bc513-15f2-1dd1-74f6-18c47931ece9 OS Type: exe State: running CPU(s): 1 Max memory: 5000000 kB Used memory: 5000000 kB Autostart: disable
Though whatever services running on the domain, every time used memory
is showing as 5000000 kB. Is that result is correct?
The 'Max memory' 5000000 KB is the hard limit that is allocated to the container. I thought that the 'used memory' field would be lower, but its possible we don't have the actual stats for used memory so just set both the same. I'd have to research the code again to answer for sure...
Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
-- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
On Thu, Apr 29, 2010 at 9:14 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Thanks ozaki. But can you please elaborate the process of getting memory.stat of a particular domain? I mounted cgroup filesystem prior to start libvirtd service using the below command: mount -t cgroup cgroup /cgroup
Then started libvirtd service. Then started the domain.
Here, can you let me know the process of viewing memory stats of that particular domain?
Could you check output of dominfo again. Cannot you get proper 'Used memory'?
By the way, in the /cgroup directory lot of files are created. In those, which one can be memory stats?
/cgroup/memory.stat is. ozaki-r
Regards, Srikanth.
-----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 5:27 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor.
On Wed, Apr 28, 2010 at 8:19 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Daniel, My requirement is to get how much memory is free in the guest domain. Can you please let me know, how can I do that?
Do you enable cgroup memory subsystem? If so, something wrong in lxc driver of 0.8.0.
BTW, 'Used memory' includes both RSS and caches, so if you need total-RSS value, you should use dommemstat.
And also, as you said it's quite easy to implement dommemstats for lxc driver, is there any possibility to implement that?
We can get statistics of dommemstat easily through memory.stat of cgroup.memory subsystem except statistics of page faults.
ozaki-r
Regards, Srikanth.
-----Original Message----- From: Daniel P. Berrange [mailto:berrange@redhat.com] Sent: Wednesday, April 28, 2010 4:46 PM To: Kumar L Srikanth-B22348 Cc: libvir-list@redhat.com Subject: Re: 'dommemstat' is not working for LXC hypervisor.
On Wed, Apr 28, 2010 at 04:43:41PM +0530, Kumar L Srikanth-B22348 wrote:
Thanks for the reply Daniel. Virsh dominfo dommand showing following results:
Id: 32473 Name: vm1 UUID: f13bc513-15f2-1dd1-74f6-18c47931ece9 OS Type: exe State: running CPU(s): 1 Max memory: 5000000 kB Used memory: 5000000 kB Autostart: disable
Though whatever services running on the domain, every time used memory
is showing as 5000000 kB. Is that result is correct?
The 'Max memory' 5000000 KB is the hard limit that is allocated to the container. I thought that the 'used memory' field would be lower, but its possible we don't have the actual stats for used memory so just set both the same. I'd have to research the code again to answer for sure...
Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
-- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
Now it's showing Used Memory as 0. I don't know whether it's correct or not. I wrote a small script in the domain to check the used memory, which will run continuously in the infinite loop. dominfo 'domainname' is showing Used Memory as 0. Is this right way to check the Used Memory of that domain? Regards, Srikanth. -----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 5:50 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor. On Thu, Apr 29, 2010 at 9:14 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Thanks ozaki. But can you please elaborate the process of getting memory.stat of a particular domain? I mounted cgroup filesystem prior to start libvirtd service using the below command: mount -t cgroup cgroup /cgroup
Then started libvirtd service. Then started the domain.
Here, can you let me know the process of viewing memory stats of that particular domain?
Could you check output of dominfo again. Cannot you get proper 'Used memory'?
By the way, in the /cgroup directory lot of files are created. In those, which one can be memory stats?
/cgroup/memory.stat is. ozaki-r
Regards, Srikanth.
-----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 5:27 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor.
On Wed, Apr 28, 2010 at 8:19 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Daniel, My requirement is to get how much memory is free in the guest domain. Can you please let me know, how can I do that?
Do you enable cgroup memory subsystem? If so, something wrong in lxc driver of 0.8.0.
BTW, 'Used memory' includes both RSS and caches, so if you need total-RSS value, you should use dommemstat.
And also, as you said it's quite easy to implement dommemstats for lxc driver, is there any possibility to implement that?
We can get statistics of dommemstat easily through memory.stat of cgroup.memory subsystem except statistics of page faults.
ozaki-r
Regards, Srikanth.
-----Original Message----- From: Daniel P. Berrange [mailto:berrange@redhat.com] Sent: Wednesday, April 28, 2010 4:46 PM To: Kumar L Srikanth-B22348 Cc: libvir-list@redhat.com Subject: Re: 'dommemstat' is not working for LXC hypervisor.
On Wed, Apr 28, 2010 at 04:43:41PM +0530, Kumar L Srikanth-B22348 wrote:
Thanks for the reply Daniel. Virsh dominfo dommand showing following results:
Id: 32473 Name: vm1 UUID: f13bc513-15f2-1dd1-74f6-18c47931ece9 OS Type: exe State: running CPU(s): 1 Max memory: 5000000 kB Used memory: 5000000 kB Autostart: disable
Though whatever services running on the domain, every time used memory
is showing as 5000000 kB. Is that result is correct?
The 'Max memory' 5000000 KB is the hard limit that is allocated to the container. I thought that the 'used memory' field would be lower, but its possible we don't have the actual stats for used memory so just set both the same. I'd have to research the code again to answer for sure...
Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 |7D3B 9505 :|
-- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
On Thu, Apr 29, 2010 at 9:32 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Now it's showing Used Memory as 0. I don't know whether it's correct or not. I wrote a small script in the domain to check the used memory, which will run continuously in the infinite loop. dominfo 'domainname' is showing Used Memory as 0. Is this right way to check the Used Memory of that domain?
dominfo should be...but something wrong. In my machine, dominfo shows like: # virsh -c lxc:/// dominfo 31105 Id: 31105 Name: cl_lxc_test UUID: fd7b21d9-6cbb-17a8-53dd-233f0aed4b4a OS Type: exe State: running CPU(s): 1 CPU time: 3.0s Max memory: 131072 kB Used memory: 23672 kB Autostart: disable However, the version of libvirt is not 0.8.0. So I try to check what changed by recent updates. Thanks, ozaki-r
Regards, Srikanth.
-----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 5:50 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor.
On Thu, Apr 29, 2010 at 9:14 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Thanks ozaki. But can you please elaborate the process of getting memory.stat of a particular domain? I mounted cgroup filesystem prior to start libvirtd service using the below command: mount -t cgroup cgroup /cgroup
Then started libvirtd service. Then started the domain.
Here, can you let me know the process of viewing memory stats of that particular domain?
Could you check output of dominfo again. Cannot you get proper 'Used memory'?
By the way, in the /cgroup directory lot of files are created. In those, which one can be memory stats?
/cgroup/memory.stat is.
ozaki-r
Regards, Srikanth.
-----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 5:27 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor.
On Wed, Apr 28, 2010 at 8:19 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Daniel, My requirement is to get how much memory is free in the guest domain. Can you please let me know, how can I do that?
Do you enable cgroup memory subsystem? If so, something wrong in lxc driver of 0.8.0.
BTW, 'Used memory' includes both RSS and caches, so if you need total-RSS value, you should use dommemstat.
And also, as you said it's quite easy to implement dommemstats for lxc driver, is there any possibility to implement that?
We can get statistics of dommemstat easily through memory.stat of cgroup.memory subsystem except statistics of page faults.
ozaki-r
Regards, Srikanth.
-----Original Message----- From: Daniel P. Berrange [mailto:berrange@redhat.com] Sent: Wednesday, April 28, 2010 4:46 PM To: Kumar L Srikanth-B22348 Cc: libvir-list@redhat.com Subject: Re: 'dommemstat' is not working for LXC hypervisor.
On Wed, Apr 28, 2010 at 04:43:41PM +0530, Kumar L Srikanth-B22348 wrote:
Thanks for the reply Daniel. Virsh dominfo dommand showing following results:
Id: 32473 Name: vm1 UUID: f13bc513-15f2-1dd1-74f6-18c47931ece9 OS Type: exe State: running CPU(s): 1 Max memory: 5000000 kB Used memory: 5000000 kB Autostart: disable
Though whatever services running on the domain, every time used memory
is showing as 5000000 kB. Is that result is correct?
The 'Max memory' 5000000 KB is the hard limit that is allocated to the container. I thought that the 'used memory' field would be lower, but its possible we don't have the actual stats for used memory so just set both the same. I'd have to research the code again to answer for sure...
Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 |7D3B 9505 :|
-- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
Thanks Ozaki. Please let me know the result, once you checked with 0.8.0. Regards, Srikanth. -----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 6:14 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor. On Thu, Apr 29, 2010 at 9:32 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Now it's showing Used Memory as 0. I don't know whether it's correct or not. I wrote a small script in the domain to check the used memory, which will run continuously in the infinite loop. dominfo 'domainname' is showing Used Memory as 0. Is this right way to check the Used Memory of that domain?
dominfo should be...but something wrong. In my machine, dominfo shows like: # virsh -c lxc:/// dominfo 31105 Id: 31105 Name: cl_lxc_test UUID: fd7b21d9-6cbb-17a8-53dd-233f0aed4b4a OS Type: exe State: running CPU(s): 1 CPU time: 3.0s Max memory: 131072 kB Used memory: 23672 kB Autostart: disable However, the version of libvirt is not 0.8.0. So I try to check what changed by recent updates. Thanks, ozaki-r
Regards, Srikanth.
-----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 5:50 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor.
On Thu, Apr 29, 2010 at 9:14 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Thanks ozaki. But can you please elaborate the process of getting memory.stat of a particular domain? I mounted cgroup filesystem prior to start libvirtd service using the below command: mount -t cgroup cgroup /cgroup
Then started libvirtd service. Then started the domain.
Here, can you let me know the process of viewing memory stats of that particular domain?
Could you check output of dominfo again. Cannot you get proper 'Used memory'?
By the way, in the /cgroup directory lot of files are created. In those, which one can be memory stats?
/cgroup/memory.stat is.
ozaki-r
Regards, Srikanth.
-----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 5:27 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor.
On Wed, Apr 28, 2010 at 8:19 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Daniel, My requirement is to get how much memory is free in the guest domain. Can you please let me know, how can I do that?
Do you enable cgroup memory subsystem? If so, something wrong in lxc driver of 0.8.0.
BTW, 'Used memory' includes both RSS and caches, so if you need total-RSS value, you should use dommemstat.
And also, as you said it's quite easy to implement dommemstats for lxc driver, is there any possibility to implement that?
We can get statistics of dommemstat easily through memory.stat of cgroup.memory subsystem except statistics of page faults.
ozaki-r
Regards, Srikanth.
-----Original Message----- From: Daniel P. Berrange [mailto:berrange@redhat.com] Sent: Wednesday, April 28, 2010 4:46 PM To: Kumar L Srikanth-B22348 Cc: libvir-list@redhat.com Subject: Re: 'dommemstat' is not working for LXC hypervisor.
On Wed, Apr 28, 2010 at 04:43:41PM +0530, Kumar L Srikanth-B22348 wrote:
Thanks for the reply Daniel. Virsh dominfo dommand showing following results:
Id: 32473 Name: vm1 UUID: f13bc513-15f2-1dd1-74f6-18c47931ece9 OS Type: exe State: running CPU(s): 1 Max memory: 5000000 kB Used memory: 5000000 kB Autostart: disable
Though whatever services running on the domain, every time used memory
is showing as 5000000 kB. Is that result is correct?
The 'Max memory' 5000000 KB is the hard limit that is allocated to the container. I thought that the 'used memory' field would be lower, but its possible we don't have the actual stats for used memory so just set both the same. I'd have to research the code again to answer for sure...
Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 |7D3B 9505 :|
-- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
On Thu, Apr 29, 2010 at 9:54 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Thanks Ozaki. Please let me know the result, once you checked with 0.8.0.
I may understand what happen. Could you check 'tree -d /cgroup' where running your domain and could you find that a directory named your domain has another directory named some numeric number? If so, could you try cgroup without ns subsystem like mount -t cgroup -o cpu,cpuacct,cpuset,memory,devices cgroup /cgroup or something. I guess running lxc with ns subsystem of cgroup has still problems. ozaki-r
Regards, Srikanth.
-----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 6:14 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor.
On Thu, Apr 29, 2010 at 9:32 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Now it's showing Used Memory as 0. I don't know whether it's correct or not. I wrote a small script in the domain to check the used memory, which will run continuously in the infinite loop. dominfo 'domainname' is showing Used Memory as 0. Is this right way to check the Used Memory of that domain?
dominfo should be...but something wrong.
In my machine, dominfo shows like:
# virsh -c lxc:/// dominfo 31105 Id: 31105 Name: cl_lxc_test UUID: fd7b21d9-6cbb-17a8-53dd-233f0aed4b4a OS Type: exe State: running CPU(s): 1 CPU time: 3.0s Max memory: 131072 kB Used memory: 23672 kB Autostart: disable
However, the version of libvirt is not 0.8.0. So I try to check what changed by recent updates.
Thanks, ozaki-r
Regards, Srikanth.
-----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 5:50 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor.
On Thu, Apr 29, 2010 at 9:14 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Thanks ozaki. But can you please elaborate the process of getting memory.stat of a particular domain? I mounted cgroup filesystem prior to start libvirtd service using the below command: mount -t cgroup cgroup /cgroup
Then started libvirtd service. Then started the domain.
Here, can you let me know the process of viewing memory stats of that particular domain?
Could you check output of dominfo again. Cannot you get proper 'Used memory'?
By the way, in the /cgroup directory lot of files are created. In those, which one can be memory stats?
/cgroup/memory.stat is.
ozaki-r
Regards, Srikanth.
-----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 5:27 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor.
On Wed, Apr 28, 2010 at 8:19 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Daniel, My requirement is to get how much memory is free in the guest domain. Can you please let me know, how can I do that?
Do you enable cgroup memory subsystem? If so, something wrong in lxc driver of 0.8.0.
BTW, 'Used memory' includes both RSS and caches, so if you need total-RSS value, you should use dommemstat.
And also, as you said it's quite easy to implement dommemstats for lxc driver, is there any possibility to implement that?
We can get statistics of dommemstat easily through memory.stat of cgroup.memory subsystem except statistics of page faults.
ozaki-r
Regards, Srikanth.
-----Original Message----- From: Daniel P. Berrange [mailto:berrange@redhat.com] Sent: Wednesday, April 28, 2010 4:46 PM To: Kumar L Srikanth-B22348 Cc: libvir-list@redhat.com Subject: Re: 'dommemstat' is not working for LXC hypervisor.
On Wed, Apr 28, 2010 at 04:43:41PM +0530, Kumar L Srikanth-B22348 wrote:
Thanks for the reply Daniel. Virsh dominfo dommand showing following results:
Id: 32473 Name: vm1 UUID: f13bc513-15f2-1dd1-74f6-18c47931ece9 OS Type: exe State: running CPU(s): 1 Max memory: 5000000 kB Used memory: 5000000 kB Autostart: disable
Though whatever services running on the domain, every time used memory
is showing as 5000000 kB. Is that result is correct?
The 'Max memory' 5000000 KB is the hard limit that is allocated to the container. I thought that the 'used memory' field would be lower, but its possible we don't have the actual stats for used memory so just set both the same. I'd have to research the code again to answer for sure...
Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 |7D3B 9505 :|
-- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
On Thu, Apr 29, 2010 at 10:23 PM, Ryota Ozaki <ozaki.ryota@gmail.com> wrote:
On Thu, Apr 29, 2010 at 9:54 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Thanks Ozaki. Please let me know the result, once you checked with 0.8.0.
I may understand what happen.
Could you check 'tree -d /cgroup' where running your domain and could you find that a directory named your domain has another directory named some numeric number?
If so, could you try cgroup without ns subsystem like mount -t cgroup -o cpu,cpuacct,cpuset,memory,devices cgroup /cgroup or something.
I guess running lxc with ns subsystem of cgroup has still problems.
OK, I've confirmed my expectation is correct. With 0.8.0, I can get proper used memory value without ns subsystem and cannot with ns enabled. The reason why this happens is as follows: ns creates a subgroup on every fork and put any child processes into them. So all processes in a container place under sub directories of libvirt/lxc/<domain>/. OTOH, cgroup.memory subsystem accounts memory statistics only its group by default, i.e., it isn't aware of sub groups (directories). On issuing dominfo, lxc driver just gets memory statistics of libvirt/lxc/<domain>/ that has no process, eventually we always get 0 as used memory. I think one solution that addresses this problem is to enable memory.use_hierarchy for every creation of libvirt/lxc/<domain>/. The option allows to account memory statistics with hierarchal manner and we can get total memory consumptions at the top of groups, i.e., libvirt/lxc/<domain>/. Thanks, ozaki-r
ozaki-r
Regards, Srikanth.
-----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 6:14 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor.
On Thu, Apr 29, 2010 at 9:32 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Now it's showing Used Memory as 0. I don't know whether it's correct or not. I wrote a small script in the domain to check the used memory, which will run continuously in the infinite loop. dominfo 'domainname' is showing Used Memory as 0. Is this right way to check the Used Memory of that domain?
dominfo should be...but something wrong.
In my machine, dominfo shows like:
# virsh -c lxc:/// dominfo 31105 Id: 31105 Name: cl_lxc_test UUID: fd7b21d9-6cbb-17a8-53dd-233f0aed4b4a OS Type: exe State: running CPU(s): 1 CPU time: 3.0s Max memory: 131072 kB Used memory: 23672 kB Autostart: disable
However, the version of libvirt is not 0.8.0. So I try to check what changed by recent updates.
Thanks, ozaki-r
Regards, Srikanth.
-----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 5:50 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor.
On Thu, Apr 29, 2010 at 9:14 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Thanks ozaki. But can you please elaborate the process of getting memory.stat of a particular domain? I mounted cgroup filesystem prior to start libvirtd service using the below command: mount -t cgroup cgroup /cgroup
Then started libvirtd service. Then started the domain.
Here, can you let me know the process of viewing memory stats of that particular domain?
Could you check output of dominfo again. Cannot you get proper 'Used memory'?
By the way, in the /cgroup directory lot of files are created. In those, which one can be memory stats?
/cgroup/memory.stat is.
ozaki-r
Regards, Srikanth.
-----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 5:27 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor.
On Wed, Apr 28, 2010 at 8:19 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Daniel, My requirement is to get how much memory is free in the guest domain. Can you please let me know, how can I do that?
Do you enable cgroup memory subsystem? If so, something wrong in lxc driver of 0.8.0.
BTW, 'Used memory' includes both RSS and caches, so if you need total-RSS value, you should use dommemstat.
And also, as you said it's quite easy to implement dommemstats for lxc driver, is there any possibility to implement that?
We can get statistics of dommemstat easily through memory.stat of cgroup.memory subsystem except statistics of page faults.
ozaki-r
Regards, Srikanth.
-----Original Message----- From: Daniel P. Berrange [mailto:berrange@redhat.com] Sent: Wednesday, April 28, 2010 4:46 PM To: Kumar L Srikanth-B22348 Cc: libvir-list@redhat.com Subject: Re: 'dommemstat' is not working for LXC hypervisor.
On Wed, Apr 28, 2010 at 04:43:41PM +0530, Kumar L Srikanth-B22348 wrote:
Thanks for the reply Daniel. Virsh dominfo dommand showing following results:
Id: 32473 Name: vm1 UUID: f13bc513-15f2-1dd1-74f6-18c47931ece9 OS Type: exe State: running CPU(s): 1 Max memory: 5000000 kB Used memory: 5000000 kB Autostart: disable
Though whatever services running on the domain, every time used memory
is showing as 5000000 kB. Is that result is correct?
The 'Max memory' 5000000 KB is the hard limit that is allocated to the container. I thought that the 'used memory' field would be lower, but its possible we don't have the actual stats for used memory so just set both the same. I'd have to research the code again to answer for sure...
Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 |7D3B 9505 :|
-- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
Thanks for your time Ozaki. But, I am new to libvirt. Can you please let me know how can we enable memory.use_hierarchy for every creation of libvirt/lxc/<domain>/? Regards, Srikanth. -----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 9:51 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor. On Thu, Apr 29, 2010 at 10:23 PM, Ryota Ozaki <ozaki.ryota@gmail.com> wrote:
On Thu, Apr 29, 2010 at 9:54 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Thanks Ozaki. Please let me know the result, once you checked with 0.8.0.
I may understand what happen.
Could you check 'tree -d /cgroup' where running your domain and could you find that a directory named your domain has another directory named some numeric number?
If so, could you try cgroup without ns subsystem like mount -t cgroup -o cpu,cpuacct,cpuset,memory,devices cgroup /cgroup or something.
I guess running lxc with ns subsystem of cgroup has still problems.
OK, I've confirmed my expectation is correct. With 0.8.0, I can get proper used memory value without ns subsystem and cannot with ns enabled. The reason why this happens is as follows: ns creates a subgroup on every fork and put any child processes into them. So all processes in a container place under sub directories of libvirt/lxc/<domain>/. OTOH, cgroup.memory subsystem accounts memory statistics only its group by default, i.e., it isn't aware of sub groups (directories). On issuing dominfo, lxc driver just gets memory statistics of libvirt/lxc/<domain>/ that has no process, eventually we always get 0 as used memory. I think one solution that addresses this problem is to enable memory.use_hierarchy for every creation of libvirt/lxc/<domain>/. The option allows to account memory statistics with hierarchal manner and we can get total memory consumptions at the top of groups, i.e., libvirt/lxc/<domain>/. Thanks, ozaki-r
ozaki-r
Regards, Srikanth.
-----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 6:14 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor.
On Thu, Apr 29, 2010 at 9:32 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Now it's showing Used Memory as 0. I don't know whether it's correct or not. I wrote a small script in the domain to check the used memory, which will run continuously in the infinite loop. dominfo 'domainname' is showing Used Memory as 0. Is this right way to check the Used Memory of that domain?
dominfo should be...but something wrong.
In my machine, dominfo shows like:
# virsh -c lxc:/// dominfo 31105 Id: 31105 Name: cl_lxc_test UUID: fd7b21d9-6cbb-17a8-53dd-233f0aed4b4a OS Type: exe State: running CPU(s): 1 CPU time: 3.0s Max memory: 131072 kB Used memory: 23672 kB Autostart: disable
However, the version of libvirt is not 0.8.0. So I try to check what changed by recent updates.
Thanks, ozaki-r
Regards, Srikanth.
-----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 5:50 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor.
On Thu, Apr 29, 2010 at 9:14 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Thanks ozaki. But can you please elaborate the process of getting memory.stat of a particular domain? I mounted cgroup filesystem prior to start libvirtd service using the below command: mount -t cgroup cgroup /cgroup
Then started libvirtd service. Then started the domain.
Here, can you let me know the process of viewing memory stats of that particular domain?
Could you check output of dominfo again. Cannot you get proper 'Used memory'?
By the way, in the /cgroup directory lot of files are created. In those, which one can be memory stats?
/cgroup/memory.stat is.
ozaki-r
Regards, Srikanth.
-----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 5:27 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor.
On Wed, Apr 28, 2010 at 8:19 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Daniel, My requirement is to get how much memory is free in the guest domain. Can you please let me know, how can I do that?
Do you enable cgroup memory subsystem? If so, something wrong in lxc driver of 0.8.0.
BTW, 'Used memory' includes both RSS and caches, so if you need total-RSS value, you should use dommemstat.
And also, as you said it's quite easy to implement dommemstats for lxc driver, is there any possibility to implement that?
We can get statistics of dommemstat easily through memory.stat of cgroup.memory subsystem except statistics of page faults.
ozaki-r
Regards, Srikanth.
-----Original Message----- From: Daniel P. Berrange [mailto:berrange@redhat.com] Sent: Wednesday, April 28, 2010 4:46 PM To: Kumar L Srikanth-B22348 Cc: libvir-list@redhat.com Subject: Re: 'dommemstat' is not working for LXC hypervisor.
On Wed, Apr 28, 2010 at 04:43:41PM +0530, Kumar L Srikanth-B22348 wrote:
Thanks for the reply Daniel. Virsh dominfo dommand showing following results:
Id: 32473 Name: vm1 UUID: f13bc513-15f2-1dd1-74f6-18c47931ece9 OS Type: exe State: running CPU(s): 1 Max memory: 5000000 kB Used memory: 5000000 kB Autostart: disable
Though whatever services running on the domain, every time used memory
is showing as 5000000 kB. Is that result is correct?
The 'Max memory' 5000000 KB is the hard limit that is allocated to the container. I thought that the 'used memory' field would be lower, but its possible we don't have the actual stats for used memory so just set both the same. I'd have to research the code again to answer for sure...
Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 |7D3B 9505 :|
-- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
On Fri, Apr 30, 2010 at 12:43 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Thanks for your time Ozaki. But, I am new to libvirt. Can you please let me know how can we enable memory.use_hierarchy for every creation of libvirt/lxc/<domain>/?
Oh I'm sorry for confusing you, the solution is for developers. For users, dropping ns subsystem of cgroups is a workaround at this time. So please enable cgroups like this mount -t cgroup -o cpu,cpuacct,cpuset,memory,devices cgroup /cgroup and then try running a domain. Note that just doing umount and mount will fail because of cgroups limitation. Cgroups doesn't allow dropping a subsystem containing groups. So before umounting, delete every groups (subdirectories). Or just rebooting your machine is an easier way. (reboot is always the last resort ;-) Regards, ozaki-r
Regards, Srikanth.
-----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 9:51 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor.
On Thu, Apr 29, 2010 at 10:23 PM, Ryota Ozaki <ozaki.ryota@gmail.com> wrote:
On Thu, Apr 29, 2010 at 9:54 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Thanks Ozaki. Please let me know the result, once you checked with 0.8.0.
I may understand what happen.
Could you check 'tree -d /cgroup' where running your domain and could you find that a directory named your domain has another directory named some numeric number?
If so, could you try cgroup without ns subsystem like mount -t cgroup -o cpu,cpuacct,cpuset,memory,devices cgroup /cgroup or something.
I guess running lxc with ns subsystem of cgroup has still problems.
OK, I've confirmed my expectation is correct. With 0.8.0, I can get proper used memory value without ns subsystem and cannot with ns enabled.
The reason why this happens is as follows: ns creates a subgroup on every fork and put any child processes into them. So all processes in a container place under sub directories of libvirt/lxc/<domain>/. OTOH, cgroup.memory subsystem accounts memory statistics only its group by default, i.e., it isn't aware of sub groups (directories). On issuing dominfo, lxc driver just gets memory statistics of libvirt/lxc/<domain>/ that has no process, eventually we always get 0 as used memory.
I think one solution that addresses this problem is to enable memory.use_hierarchy for every creation of libvirt/lxc/<domain>/. The option allows to account memory statistics with hierarchal manner and we can get total memory consumptions at the top of groups, i.e., libvirt/lxc/<domain>/.
Thanks, ozaki-r
ozaki-r
Regards, Srikanth.
-----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 6:14 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor.
On Thu, Apr 29, 2010 at 9:32 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Now it's showing Used Memory as 0. I don't know whether it's correct or not. I wrote a small script in the domain to check the used memory, which will run continuously in the infinite loop. dominfo 'domainname' is showing Used Memory as 0. Is this right way to check the Used Memory of that domain?
dominfo should be...but something wrong.
In my machine, dominfo shows like:
# virsh -c lxc:/// dominfo 31105 Id: 31105 Name: cl_lxc_test UUID: fd7b21d9-6cbb-17a8-53dd-233f0aed4b4a OS Type: exe State: running CPU(s): 1 CPU time: 3.0s Max memory: 131072 kB Used memory: 23672 kB Autostart: disable
However, the version of libvirt is not 0.8.0. So I try to check what changed by recent updates.
Thanks, ozaki-r
Regards, Srikanth.
-----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 5:50 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor.
On Thu, Apr 29, 2010 at 9:14 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Thanks ozaki. But can you please elaborate the process of getting memory.stat of a particular domain? I mounted cgroup filesystem prior to start libvirtd service using the below command: mount -t cgroup cgroup /cgroup
Then started libvirtd service. Then started the domain.
Here, can you let me know the process of viewing memory stats of that particular domain?
Could you check output of dominfo again. Cannot you get proper 'Used memory'?
By the way, in the /cgroup directory lot of files are created. In those, which one can be memory stats?
/cgroup/memory.stat is.
ozaki-r
Regards, Srikanth.
-----Original Message----- From: Ryota Ozaki [mailto:ozaki.ryota@gmail.com] Sent: Thursday, April 29, 2010 5:27 PM To: Kumar L Srikanth-B22348 Cc: Daniel P. Berrange; libvirt list; Ryota OZAKI Subject: Re: [libvirt] 'dommemstat' is not working for LXC hypervisor.
On Wed, Apr 28, 2010 at 8:19 PM, Kumar L Srikanth-B22348 <B22348@freescale.com> wrote:
Daniel, My requirement is to get how much memory is free in the guest domain. Can you please let me know, how can I do that?
Do you enable cgroup memory subsystem? If so, something wrong in lxc driver of 0.8.0.
BTW, 'Used memory' includes both RSS and caches, so if you need total-RSS value, you should use dommemstat.
And also, as you said it's quite easy to implement dommemstats for lxc driver, is there any possibility to implement that?
We can get statistics of dommemstat easily through memory.stat of cgroup.memory subsystem except statistics of page faults.
ozaki-r
Regards, Srikanth.
-----Original Message----- From: Daniel P. Berrange [mailto:berrange@redhat.com] Sent: Wednesday, April 28, 2010 4:46 PM To: Kumar L Srikanth-B22348 Cc: libvir-list@redhat.com Subject: Re: 'dommemstat' is not working for LXC hypervisor.
On Wed, Apr 28, 2010 at 04:43:41PM +0530, Kumar L Srikanth-B22348 wrote: > Thanks for the reply Daniel. > Virsh dominfo dommand showing following results: > > Id: 32473 > Name: vm1 > UUID: f13bc513-15f2-1dd1-74f6-18c47931ece9 > OS Type: exe > State: running > CPU(s): 1 > Max memory: 5000000 kB > Used memory: 5000000 kB > Autostart: disable > > > Though whatever services running on the domain, every time used > memory
> is showing as 5000000 kB. Is that result is correct?
The 'Max memory' 5000000 KB is the hard limit that is allocated to the container. I thought that the 'used memory' field would be lower, but its possible we don't have the actual stats for used memory so just set both the same. I'd have to research the code again to answer for sure...
Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 |7D3B 9505 :|
-- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
On Wed, Apr 28, 2010 at 8:15 PM, Daniel P. Berrange <berrange@redhat.com> wrote:
On Wed, Apr 28, 2010 at 04:43:41PM +0530, Kumar L Srikanth-B22348 wrote:
Thanks for the reply Daniel. Virsh dominfo dommand showing following results:
Id: 32473 Name: vm1 UUID: f13bc513-15f2-1dd1-74f6-18c47931ece9 OS Type: exe State: running CPU(s): 1 Max memory: 5000000 kB Used memory: 5000000 kB Autostart: disable
Though whatever services running on the domain, every time used memory is showing as 5000000 kB. Is that result is correct?
The 'Max memory' 5000000 KB is the hard limit that is allocated to the container. I thought that the 'used memory' field would be lower, but its possible we don't have the actual stats for used memory so just set both the same. I'd have to research the code again to answer for sure...
Hmm, we should be able to get 'Used memory' via cgroup.memory. If not, it should be a regression. I haven't tested on 0.8.0 yet though, it worked on 0.7.6 at least. ozaki-r
Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
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participants (3)
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Daniel P. Berrange -
Kumar L Srikanth-B22348 -
Ryota Ozaki