[Pkg-libvirt-maintainers] Bug#574272: [PATCH] add debug printout to qemuMonitorTextGetMigrationStatus()

[Andreas Bießmann]

Full quote (and cc to Guido Günther) since message before seems to be
delayed (or will be returned).

Investigation of 'info migration' in kvm 72 showed following result:

---8<---
qemuMonitorTextGetMigrationStatus(): reply = 'Migration active
Transfer rate 0.0 kb/s
Iteration 0
Transferred 14/136192 pages
Maximum migration speed is 32.0 mb/s
'
--->8---

Seems a huge effort to switch back to 'info migration' when 'info
migrate' failes ...

I suggest a new patch to detect the error in qemu-monitor when parsing
reply to 'info migrate', patch attached.

regards

Andreas Bießmann

Andreas Bießmann wrote:
> This is result of further investigation of 'info migrate' issue. kvm 72 seems
> to have 'info migration' rather than 'info migrate'. Maybe we could use this
> command in favor of 'info migrate', but we need to know the version of command
> interface. Still have to investigate the command 'info migration' in kvm 72!
> 
> Patch and further comments attached!
> 
> regards
> 
> Andreas Bießmann
> 
> ---
> 
> Result of this patch with kvm 72 is:
> 
> ---8<---
> qemuMonitorTextGetMigrationStatus(): reply = 'info version  -- show the version of qemu
> info network  -- show the network state
> info block  -- show the block devices
> info blockstats  -- show block device statistics
> info registers  -- show the cpu registers
> info cpus  -- show infos for each CPU
> info history  -- show the command line history
> info irq  -- show the interrupts statistics (if available)
> info pic  -- show i8259 (PIC) state
> info pci  -- show PCI info
> info tlb  -- show virtual to physical memory mappings
> info mem  -- show the active virtual memory mappings
> info jit  -- show dynamic compiler info
> info kqemu  -- show kqemu information
> info kvm  -- show kvm information
> info usb  -- show guest USB devices
> info usbhost  -- show host USB devices
> info profile  -- show profiling information
> info capture  -- show capture information
> info snapshots  -- show the currently saved VM snapshots
> info pcmcia  -- show guest PCMCIA status
> info mice  -- show which guest mouse is receiving events
> info vnc  -- show the vnc server status
> info name  -- show the current VM name
> info slirp  -- show SLIRP statistics
> info migration  -- show migration information
> '
> --->8---
> 
> Result of this patch with qemu-kvm 0.11.1 installed is:
> 
> ---8<---
> qemuMonitorTextGetMigrationStatus(): reply = 'Migration status: active
> transferred ram: 108 kbytes
> remaining ram: 540820 kbytes
> total ram: 540928 kbytes
> '
> --->8---
> 
> This message is continiously repeated. transferred ram, remaining ram and
> total ram is always the same value!
> 
> Signed-off-by: Andreas Bießmann <biessmann at corscience.de>
> ---
>  src/qemu/qemu_monitor_text.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/src/qemu/qemu_monitor_text.c b/src/qemu/qemu_monitor_text.c
> index 7f0e7f6..137fd7d 100644
> --- a/src/qemu/qemu_monitor_text.c
> +++ b/src/qemu/qemu_monitor_text.c
> @@ -1024,6 +1024,8 @@ int qemuMonitorTextGetMigrationStatus(qemuMonitorPtr mon,
>          return -1;
>      }
>  
> +    printf("\n%s(): reply = '%s'\n", __func__, reply);
> +
>      if ((tmp = strstr(reply, MIGRATION_PREFIX)) != NULL) {
>          tmp += strlen(MIGRATION_PREFIX);
>          end = strchr(tmp, '\r');


-- 
Andreas Bießmann, Dipl.-Ing. (FH)
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