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SubjectRe: [PATCH] virtio_balloon: export huge page allocation statistics
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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@oracle.com>
>
> Any host/guest intergace changes need to be copied to
> the virtio TC mailing list (subscriber-only, sorry about that):
> virtio-dev@lists.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

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