From: Jonathan Helman <jonathan.helman@oracle.com>
To: Jason Wang <jasowang@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>
Cc: virtualization@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, virtio-dev@lists.oasis-open.org,
Mihai Carabas <mihai.carabas@oracle.com>
Subject: Re: [virtio-dev] Re: [PATCH v2] virtio_balloon: export hugetlb page allocation counts
Date: Mon, 9 Apr 2018 14:11:19 -0700 [thread overview]
Message-ID: <b1414be4-84bc-5d02-afff-9e42c1fd7210@oracle.com> (raw)
In-Reply-To: <3f8a1b91-c5ba-8a24-72b8-02d884a67826@redhat.com>
On 03/22/2018 07:38 PM, Jason Wang wrote:
>
>
> On 2018年03月22日 11:10, Michael S. Tsirkin wrote:
>> On Thu, Mar 22, 2018 at 09:52:18AM +0800, Jason Wang wrote:
>>> On 2018年03月20日 12:26, Jonathan Helman wrote:
>>>>> On Mar 19, 2018, at 7:31 PM, Jason Wang<jasowang@redhat.com> wrote:
>>>>>
>>>>>
>>>>>
>>>>> On 2018年03月20日 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@oracle.com>
>>>>> Reviewed-by: Jason Wang<jasowang@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
next prev parent reply other threads:[~2018-04-09 21:11 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-19 22:14 [PATCH v2] virtio_balloon: export hugetlb page allocation counts Jonathan Helman
2018-03-20 2:31 ` Jason Wang
2018-03-20 4:26 ` Jonathan Helman
2018-03-22 1:52 ` [virtio-dev] " Jason Wang
2018-03-22 3:10 ` Michael S. Tsirkin
2018-03-23 2:38 ` Jason Wang
2018-04-09 21:11 ` Jonathan Helman [this message]
2018-04-11 3:12 ` Jason Wang
2018-04-12 0:24 ` Jonathan Helman
2018-04-13 7:01 ` Jason Wang
2018-04-13 13:44 ` Michael S. Tsirkin
2018-04-13 17:10 ` Jonathan Helman
2018-04-13 21:51 ` Michael S. Tsirkin
2018-04-13 22:03 ` Jonathan Helman
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=b1414be4-84bc-5d02-afff-9e42c1fd7210@oracle.com \
--to=jonathan.helman@oracle.com \
--cc=jasowang@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mihai.carabas@oracle.com \
--cc=mst@redhat.com \
--cc=virtio-dev@lists.oasis-open.org \
--cc=virtualization@lists.linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).