linux-kernel - Re: [PATCH] virtio_balloon: export huge page allocation statistics

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Date:   Fri, 2 Mar 2018 14:16:05 -0800
From:   Jonathan Helman <jonathan.helman@...cle.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     jasowang@...hat.com, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] virtio_balloon: export huge page allocation statistics



On 02/27/2018 07:20 AM, Michael S. Tsirkin wrote:
> On Fri, Feb 16, 2018 at 09:44:32PM -0800, Jonathan Helman wrote:
>> Export statistics for successful and failed huge page allocations
>> from the virtio balloon driver. These 2 stats come directly from
>> the vm_events HTLB_BUDDY_PGALLOC and HTLB_BUDDY_PGALLOC_FAIL.
>> Signed-off-by: Jonathan Helman <jonathan.helman@...cle.com>
> 
> Any host/guest intergace changes need to be copied to
> the virtio TC mailing list (subscriber-only, sorry about that):
> virtio-dev@...ts.oasis-open.org
> 

Sorry, will do on v2.

>> ---
>>   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..e3e8071 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  /* Number of htlb pgalloc successes */
>> +#define VIRTIO_BALLOON_S_HTLB_PGFAIL   9  /* Number of htlb pgalloc failures */
>> +#define VIRTIO_BALLOON_S_NR       10
> 
> Can you clarify the comments pls? Eschew abbreviation.

Sure. How about the following instead? Hoping it makes things clearer, 
without going over the 80 character limit ;)

#define VIRTIO_BALLOON_S_HTLB_PGALLOC  8  /* Hugetlb page allocations */
#define VIRTIO_BALLOON_S_HTLB_PGFAIL   9  /* Hugetlb page allocation 
failures */

If this is better, I'll send out a v2.

Thanks,
Jon

> 
>>   
>>   /*
>>    * Memory statistics structure.
>> -- 
>> 1.8.3.1