thr3ads.net - Linux Virtualization - [virtio-dev] Re: [PATCH v2] virtio_balloon: export hugetlb page allocation counts [Mar 2018]

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Jonathan Helman

2018-Mar-20 04:26 UTC

[PATCH v2] virtio_balloon: export hugetlb page allocation counts

> On Mar 19, 2018, at 7:31 PM, Jason Wang <jasowang at redhat.com>
wrote:
> 
> 
> 
> On 2018?03?20? 06:14, Jonathan Helman wrote:
>> Export the number of successful and failed hugetlb page
>> allocations via the virtio balloon driver. These 2 counts
>> come directly from the vm_events HTLB_BUDDY_PGALLOC and
>> HTLB_BUDDY_PGALLOC_FAIL.
>> 
>> Signed-off-by: Jonathan Helman <jonathan.helman at oracle.com>
> 
> Reviewed-by: Jason Wang <jasowang at redhat.com>
Thanks.
> 
>> ---
>>  drivers/virtio/virtio_balloon.c     | 6 ++++++
>>  include/uapi/linux/virtio_balloon.h | 4 +++-
>>  2 files changed, 9 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/virtio/virtio_balloon.c
b/drivers/virtio/virtio_balloon.c
>> index dfe5684..6b237e3 100644
>> --- a/drivers/virtio/virtio_balloon.c
>> +++ b/drivers/virtio/virtio_balloon.c
>> @@ -272,6 +272,12 @@ static unsigned int update_balloon_stats(struct
virtio_balloon *vb)
>>  				pages_to_bytes(events[PSWPOUT]));
>>  	update_stat(vb, idx++, VIRTIO_BALLOON_S_MAJFLT, events[PGMAJFAULT]);
>>  	update_stat(vb, idx++, VIRTIO_BALLOON_S_MINFLT, events[PGFAULT]);
>> +#ifdef CONFIG_HUGETLB_PAGE
>> +	update_stat(vb, idx++, VIRTIO_BALLOON_S_HTLB_PGALLOC,
>> +		    events[HTLB_BUDDY_PGALLOC]);
>> +	update_stat(vb, idx++, VIRTIO_BALLOON_S_HTLB_PGFAIL,
>> +		    events[HTLB_BUDDY_PGALLOC_FAIL]);
>> +#endif
>>  #endif
>>  	update_stat(vb, idx++, VIRTIO_BALLOON_S_MEMFREE,
>>  				pages_to_bytes(i.freeram));
>> diff --git a/include/uapi/linux/virtio_balloon.h
b/include/uapi/linux/virtio_balloon.h
>> index 4e8b830..40297a3 100644
>> --- a/include/uapi/linux/virtio_balloon.h
>> +++ b/include/uapi/linux/virtio_balloon.h
>> @@ -53,7 +53,9 @@ struct virtio_balloon_config {
>>  #define VIRTIO_BALLOON_S_MEMTOT   5   /* Total amount of memory */
>>  #define VIRTIO_BALLOON_S_AVAIL    6   /* Available memory as in /proc
*/
>>  #define VIRTIO_BALLOON_S_CACHES   7   /* Disk caches */
>> -#define VIRTIO_BALLOON_S_NR       8
>> +#define VIRTIO_BALLOON_S_HTLB_PGALLOC  8  /* Hugetlb page allocations
*/
>> +#define VIRTIO_BALLOON_S_HTLB_PGFAIL   9  /* Hugetlb page allocation
failures */
>> +#define VIRTIO_BALLOON_S_NR       10
>>    /*
>>   * Memory statistics structure.
> 
> Not for this patch, but it looks to me that exporting such nr through uapi
is fragile.
Sorry, can you explain what you mean here?

Jon
> 
> Thanks

Jason Wang

2018-Mar-22 01:52 UTC

head link

[virtio-dev] Re: [PATCH v2] virtio_balloon: export hugetlb page allocation counts

On 2018?03?20? 12:26, Jonathan Helman wrote:>> On Mar 19, 2018, at 7:31 PM, Jason Wang <jasowang at redhat.com>
wrote:
>>
>>
>>
>> On 2018?03?20? 06:14, Jonathan Helman wrote:
>>> Export the number of successful and failed hugetlb page
>>> allocations via the virtio balloon driver. These 2 counts
>>> come directly from the vm_events HTLB_BUDDY_PGALLOC and
>>> HTLB_BUDDY_PGALLOC_FAIL.
>>>
>>> Signed-off-by: Jonathan Helman <jonathan.helman at
oracle.com>
>> Reviewed-by: Jason Wang <jasowang at redhat.com>
> Thanks.
>
>>> ---
>>>   drivers/virtio/virtio_balloon.c     | 6 ++++++
>>>   include/uapi/linux/virtio_balloon.h | 4 +++-
>>>   2 files changed, 9 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/virtio/virtio_balloon.c
b/drivers/virtio/virtio_balloon.c
>>> index dfe5684..6b237e3 100644
>>> --- a/drivers/virtio/virtio_balloon.c
>>> +++ b/drivers/virtio/virtio_balloon.c
>>> @@ -272,6 +272,12 @@ static unsigned int
update_balloon_stats(struct virtio_balloon *vb)
>>>   				pages_to_bytes(events[PSWPOUT]));
>>>   	update_stat(vb, idx++, VIRTIO_BALLOON_S_MAJFLT,
events[PGMAJFAULT]);
>>>   	update_stat(vb, idx++, VIRTIO_BALLOON_S_MINFLT,
events[PGFAULT]);
>>> +#ifdef CONFIG_HUGETLB_PAGE
>>> +	update_stat(vb, idx++, VIRTIO_BALLOON_S_HTLB_PGALLOC,
>>> +		    events[HTLB_BUDDY_PGALLOC]);
>>> +	update_stat(vb, idx++, VIRTIO_BALLOON_S_HTLB_PGFAIL,
>>> +		    events[HTLB_BUDDY_PGALLOC_FAIL]);
>>> +#endif
>>>   #endif
>>>   	update_stat(vb, idx++, VIRTIO_BALLOON_S_MEMFREE,
>>>   				pages_to_bytes(i.freeram));
>>> diff --git a/include/uapi/linux/virtio_balloon.h
b/include/uapi/linux/virtio_balloon.h
>>> index 4e8b830..40297a3 100644
>>> --- a/include/uapi/linux/virtio_balloon.h
>>> +++ b/include/uapi/linux/virtio_balloon.h
>>> @@ -53,7 +53,9 @@ struct virtio_balloon_config {
>>>   #define VIRTIO_BALLOON_S_MEMTOT   5   /* Total amount of memory
*/
>>>   #define VIRTIO_BALLOON_S_AVAIL    6   /* Available memory as in
/proc */
>>>   #define VIRTIO_BALLOON_S_CACHES   7   /* Disk caches */
>>> -#define VIRTIO_BALLOON_S_NR       8
>>> +#define VIRTIO_BALLOON_S_HTLB_PGALLOC  8  /* Hugetlb page
allocations */
>>> +#define VIRTIO_BALLOON_S_HTLB_PGFAIL   9  /* Hugetlb page
allocation failures */
>>> +#define VIRTIO_BALLOON_S_NR       10
>>>     /*
>>>    * Memory statistics structure.
>> Not for this patch, but it looks to me that exporting such nr through
uapi is fragile.
> Sorry, can you explain what you mean here?
>
> Jon
Spec said "Within an output buffer submitted to the statsq, the device 
MUST ignore entries with tag values that it does not recognize". So 
exporting VIRTIO_BALLOON_S_NR seems useless and device implementation 
can not depend on such number in uapi.

Thanks
>
>> Thanks
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: virtio-dev-unsubscribe at lists.oasis-open.org
> For additional commands, e-mail: virtio-dev-help at lists.oasis-open.org
>

Michael S. Tsirkin

2018-Mar-22 03:10 UTC

head link

[virtio-dev] Re: [PATCH v2] virtio_balloon: export hugetlb page allocation counts

On Thu, Mar 22, 2018 at 09:52:18AM +0800, Jason Wang
wrote:> 
> 
> On 2018?03?20? 12:26, Jonathan Helman wrote:
> > > On Mar 19, 2018, at 7:31 PM, Jason Wang <jasowang at
redhat.com> wrote:
> > > 
> > > 
> > > 
> > > On 2018?03?20? 06:14, Jonathan Helman wrote:
> > > > Export the number of successful and failed hugetlb page
> > > > allocations via the virtio balloon driver. These 2 counts
> > > > come directly from the vm_events HTLB_BUDDY_PGALLOC and
> > > > HTLB_BUDDY_PGALLOC_FAIL.
> > > > 
> > > > Signed-off-by: Jonathan Helman <jonathan.helman at
oracle.com>
> > > Reviewed-by: Jason Wang <jasowang at redhat.com>
> > Thanks.
> > 
> > > > ---
> > > >   drivers/virtio/virtio_balloon.c     | 6 ++++++
> > > >   include/uapi/linux/virtio_balloon.h | 4 +++-
> > > >   2 files changed, 9 insertions(+), 1 deletion(-)
> > > > 
> > > > diff --git a/drivers/virtio/virtio_balloon.c
b/drivers/virtio/virtio_balloon.c
> > > > index dfe5684..6b237e3 100644
> > > > --- a/drivers/virtio/virtio_balloon.c
> > > > +++ b/drivers/virtio/virtio_balloon.c
> > > > @@ -272,6 +272,12 @@ static unsigned int
update_balloon_stats(struct virtio_balloon *vb)
> > > >   				pages_to_bytes(events[PSWPOUT]));
> > > >   	update_stat(vb, idx++, VIRTIO_BALLOON_S_MAJFLT,
events[PGMAJFAULT]);
> > > >   	update_stat(vb, idx++, VIRTIO_BALLOON_S_MINFLT,
events[PGFAULT]);
> > > > +#ifdef CONFIG_HUGETLB_PAGE
> > > > +	update_stat(vb, idx++, VIRTIO_BALLOON_S_HTLB_PGALLOC,
> > > > +		    events[HTLB_BUDDY_PGALLOC]);
> > > > +	update_stat(vb, idx++, VIRTIO_BALLOON_S_HTLB_PGFAIL,
> > > > +		    events[HTLB_BUDDY_PGALLOC_FAIL]);
> > > > +#endif
> > > >   #endif
> > > >   	update_stat(vb, idx++, VIRTIO_BALLOON_S_MEMFREE,
> > > >   				pages_to_bytes(i.freeram));
> > > > diff --git a/include/uapi/linux/virtio_balloon.h
b/include/uapi/linux/virtio_balloon.h
> > > > index 4e8b830..40297a3 100644
> > > > --- a/include/uapi/linux/virtio_balloon.h
> > > > +++ b/include/uapi/linux/virtio_balloon.h
> > > > @@ -53,7 +53,9 @@ struct virtio_balloon_config {
> > > >   #define VIRTIO_BALLOON_S_MEMTOT   5   /* Total amount of
memory */
> > > >   #define VIRTIO_BALLOON_S_AVAIL    6   /* Available memory
as in /proc */
> > > >   #define VIRTIO_BALLOON_S_CACHES   7   /* Disk caches */
> > > > -#define VIRTIO_BALLOON_S_NR       8
> > > > +#define VIRTIO_BALLOON_S_HTLB_PGALLOC  8  /* Hugetlb page
allocations */
> > > > +#define VIRTIO_BALLOON_S_HTLB_PGFAIL   9  /* Hugetlb page
allocation failures */
> > > > +#define VIRTIO_BALLOON_S_NR       10
> > > >     /*
> > > >    * Memory statistics structure.
> > > Not for this patch, but it looks to me that exporting such nr
through uapi is fragile.
> > Sorry, can you explain what you mean here?
> > 
> > Jon
> 
> Spec said "Within an output buffer submitted to the statsq, the device
MUST
> ignore entries with tag values that it does not recognize". So
exporting
> VIRTIO_BALLOON_S_NR seems useless and device implementation can not depend
> on such number in uapi.
> 
> Thanks
Suggestions? I don't like to break build for people ...
> > 
> > > Thanks
> > 
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: virtio-dev-unsubscribe at lists.oasis-open.org
> > For additional commands, e-mail: virtio-dev-help at
lists.oasis-open.org
> >

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