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Michael S. Tsirkin

2018-Mar-22 03:10 UTC

[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
> >

Jason Wang

2018-Mar-23 02:38 UTC

head link

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

On 2018?03?22? 11:10, Michael S. Tsirkin wrote:> 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 ...
>
Didn't have a good idea. But maybe we should keep VIRTIO_BALLOON_S_NR 
unchanged, and add a comment here.

Thanks

Jonathan Helman

2018-Apr-09 21:11 UTC

head link

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

On 03/22/2018 07:38 PM, Jason Wang wrote:> 
> 
> On 2018?03?22? 11:10, Michael S. Tsirkin wrote:
>> 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 ...
>>
> 
> Didn't have a good idea. But maybe we should keep VIRTIO_BALLOON_S_NR 
> unchanged, and add a comment here.
> 
> Thanks
I think Jason's comment is for a future patch. Didn't see this patch get
applied, so wondering if it could be.

Thanks,
Jon

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