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Re: [libvirt] [PATCH libvirt-python] virNodeInfo.memory is in KiB



Hello Daniel,


Am 05.12.18 um 13:10 schrieb Daniel P. Berrangé:
> On Wed, Dec 05, 2018 at 01:01:13PM +0100, Philipp Hahn wrote:
>> but the Python library does an extra left shift of 10 bits returning MiB
>> instead:
...
>>> # ./a.out
>>> 4041088
>>
>>> # python -c 'import libvirt;c=libvirt.open("qemu:///system");print(c.getInfo()[1])'
>>> 3946
>>
>> Fixes: 197153c6
> 
> Not sure why you're quoting that commit has as it is unrelated.
> 
> This use of MB is from pretty much day 1 in 506fb7d8

Yes, you're right, that was the wrong commit hash and 506fb7d8 is the
correct one.

>> Signed-off-by: Philipp Hahn <hahn univention de>
>> ---
>>  libvirt-override.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/libvirt-override.c b/libvirt-override.c
>> index f7b2f6b..616fa1c 100644
>> --- a/libvirt-override.c
>> +++ b/libvirt-override.c
>> @@ -2740,7 +2740,7 @@ libvirt_virNodeGetInfo(PyObject *self ATTRIBUTE_UNUSED,
>>      VIR_PY_LIST_SET_GOTO(py_retval, 0,
>>                           libvirt_constcharPtrWrap(&info.model[0]), error);
>>      VIR_PY_LIST_SET_GOTO(py_retval, 1,
>> -                         libvirt_longWrap((long) info.memory >> 10), error);
>> +                         libvirt_longWrap((long) info.memory), error);
> 
> We can't change this as it would break every single existing user of this
> API which have been written to expect this to be a MB value.

Okay. This is already documented in libvirt-override-api.xml:

> 102     <function name='virNodeGetInfo' file='python'>                                                                                                                             
> 103       <info>Extract hardware information about the Node. Note that the memory size is reported in MiB instead of KiB.</info>

I was only looking at the C-API documentation.
So my patch can go to >/dev/null.

Sorry for the noise.

Philipp


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