From: Alexander Duyck <alexander.h.duyck@linux.intel.com>
To: David Hildenbrand <david@redhat.com>,
Alexander Duyck <alexander.duyck@gmail.com>,
virtio-dev@lists.oasis-open.org, kvm@vger.kernel.org,
mst@redhat.com, catalin.marinas@arm.com, dave.hansen@intel.com,
linux-kernel@vger.kernel.org, willy@infradead.org,
mhocko@kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org,
will@kernel.org, linux-arm-kernel@lists.infradead.org,
osalvador@suse.de
Cc: yang.zhang.wz@gmail.com, pagupta@redhat.com,
konrad.wilk@oracle.com, nitesh@redhat.com, riel@surriel.com,
lcapitulino@redhat.com, wei.w.wang@intel.com,
aarcange@redhat.com, ying.huang@intel.com, pbonzini@redhat.com,
dan.j.williams@intel.com, fengguang.wu@intel.com,
kirill.shutemov@linux.intel.com
Subject: Re: [PATCH v9 7/8] virtio-balloon: Pull page poisoning config out of free page hinting
Date: Mon, 09 Sep 2019 08:31:51 -0700 [thread overview]
Message-ID: <f9c1abd93b9546885eb10d0cd62ee7421b484ba2.camel@linux.intel.com> (raw)
In-Reply-To: <4dfcf372-97be-65ab-1349-75f24aa4f98a@redhat.com>
On Mon, 2019-09-09 at 10:59 +0200, David Hildenbrand wrote:
> On 07.09.19 19:26, Alexander Duyck wrote:
> > From: Alexander Duyck <alexander.h.duyck@linux.intel.com>
> >
> > Currently the page poisoning setting wasn't being enabled unless free page
> > hinting was enabled. However we will need the page poisoning tracking logic
> > as well for unused page reporting. As such pull it out and make it a
> > separate bit of config in the probe function.
> >
> > In addition we can actually wrap the code in a check for NO_SANITY. If we
> > don't care what is actually in the page we can just default to 0 and leave
> > it there.
> >
> > Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
> > ---
> > drivers/virtio/virtio_balloon.c | 22 +++++++++++++++-------
> > 1 file changed, 15 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
> > index 226fbb995fb0..d2547df7de93 100644
> > --- a/drivers/virtio/virtio_balloon.c
> > +++ b/drivers/virtio/virtio_balloon.c
> > @@ -842,7 +842,6 @@ static int virtio_balloon_register_shrinker(struct virtio_balloon *vb)
> > static int virtballoon_probe(struct virtio_device *vdev)
> > {
> > struct virtio_balloon *vb;
> > - __u32 poison_val;
> > int err;
> >
> > if (!vdev->config->get) {
> > @@ -909,11 +908,18 @@ static int virtballoon_probe(struct virtio_device *vdev)
> > VIRTIO_BALLOON_CMD_ID_STOP);
> > spin_lock_init(&vb->free_page_list_lock);
> > INIT_LIST_HEAD(&vb->free_page_list);
> > - if (virtio_has_feature(vdev, VIRTIO_BALLOON_F_PAGE_POISON)) {
> > - memset(&poison_val, PAGE_POISON, sizeof(poison_val));
> > - virtio_cwrite(vb->vdev, struct virtio_balloon_config,
> > - poison_val, &poison_val);
> > - }
> > + }
> > + if (virtio_has_feature(vdev, VIRTIO_BALLOON_F_PAGE_POISON)) {
> > + __u32 poison_val;
> > +
> > + /*
> > + * Let hypervisor know that we are expecting a specific
> > + * value to be written back in unused pages.
> > + */
>
> "Let the hypervisor know" ... ?
>
> > + memset(&poison_val, PAGE_POISON, sizeof(poison_val));
> > +
> > + virtio_cwrite(vb->vdev, struct virtio_balloon_config,
> > + poison_val, &poison_val);
> > }
> > /*
> > * We continue to use VIRTIO_BALLOON_F_DEFLATE_ON_OOM to decide if a
> > @@ -1014,7 +1020,9 @@ static int virtballoon_restore(struct virtio_device *vdev)
> >
> > static int virtballoon_validate(struct virtio_device *vdev)
> > {
> > - if (!page_poisoning_enabled())
> > + /* Notify host if we care about poison value */
>
> "Tell the host whether we care about poisoned pages." ?
>
> > + if (IS_ENABLED(CONFIG_PAGE_POISONING_NO_SANITY) ||
> > + !page_poisoning_enabled())
> > __virtio_clear_bit(vdev, VIRTIO_BALLOON_F_PAGE_POISON);
> >
> > __virtio_clear_bit(vdev, VIRTIO_F_IOMMU_PLATFORM);
> >
>
> Reviewed-by: David Hildenbrand <david@redhat.com>
>
Thanks. I will update the comments for v10.
- Alex
next prev parent reply other threads:[~2019-09-09 15:31 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-07 17:25 [PATCH v9 0/8] stg mail -e --version=v9 \ Alexander Duyck
2019-09-07 17:25 ` [PATCH v9 1/8] mm: Add per-cpu logic to page shuffling Alexander Duyck
2019-09-09 8:14 ` David Hildenbrand
2019-09-09 15:11 ` Alexander Duyck
2019-09-10 12:11 ` Michal Hocko
2019-09-10 22:14 ` Alexander Duyck
2019-09-10 22:11 ` Alexander Duyck
2019-09-09 9:07 ` Kirill A. Shutemov
2019-09-09 15:12 ` Alexander Duyck
2019-09-07 17:25 ` [PATCH v9 2/8] mm: Adjust shuffle code to allow for future coalescing Alexander Duyck
2019-09-09 8:19 ` David Hildenbrand
2019-09-09 9:47 ` Kirill A. Shutemov
2019-09-09 15:22 ` Alexander Duyck
2019-09-09 15:35 ` Kirill A. Shutemov
2019-09-09 15:37 ` Alexander Duyck
2019-09-09 16:43 ` Alexander Duyck
2019-09-09 17:00 ` Kirill A. Shutemov
2019-09-10 12:20 ` Michal Hocko
2019-09-10 14:48 ` Alexander Duyck
2019-09-07 17:25 ` [PATCH v9 3/8] mm: Move set/get_pcppage_migratetype to mmzone.h Alexander Duyck
2019-09-09 8:22 ` David Hildenbrand
2019-09-09 9:56 ` Kirill A. Shutemov
2019-09-09 18:01 ` Alexander Duyck
2019-09-09 18:12 ` Alexander Duyck
2019-09-10 12:23 ` Michal Hocko
2019-09-10 14:46 ` Alexander Duyck
2019-09-10 17:45 ` Michal Hocko
2019-09-10 20:26 ` Alexander Duyck
2019-09-07 17:25 ` [PATCH v9 4/8] mm: Use zone and order instead of free area in free_list manipulators Alexander Duyck
2019-09-10 12:27 ` Michal Hocko
2019-09-07 17:25 ` [PATCH v9 5/8] arm64: Move hugetlb related definitions out of pgtable.h to page-defs.h Alexander Duyck
2019-09-09 8:52 ` David Hildenbrand
2019-09-09 15:27 ` Alexander Duyck
2019-09-17 17:48 ` Will Deacon
2019-09-17 20:07 ` Alexander Duyck
2019-09-07 17:25 ` [PATCH v9 6/8] mm: Introduce Reported pages Alexander Duyck
2019-09-09 14:42 ` Kirill A. Shutemov
2019-09-09 16:25 ` Alexander Duyck
2019-09-09 16:33 ` Kirill A. Shutemov
2019-09-07 17:26 ` [PATCH v9 7/8] virtio-balloon: Pull page poisoning config out of free page hinting Alexander Duyck
2019-09-09 8:59 ` David Hildenbrand
2019-09-09 15:31 ` Alexander Duyck [this message]
2019-09-07 17:26 ` [PATCH v9 8/8] virtio-balloon: Add support for providing unused page reports to host Alexander Duyck
2019-09-07 17:34 ` [PATCH v9 0/8] mm / virtio: Provide support for unused page reporting Alexander Duyck
2019-09-10 12:42 ` [PATCH v9 0/8] stg mail -e --version=v9 \ Michal Hocko
2019-09-10 14:42 ` Alexander Duyck
2019-09-10 14:47 ` Michal Hocko
2019-09-10 16:05 ` Alexander Duyck
2019-09-10 16:18 ` [virtio-dev] " Dr. David Alan Gilbert
2019-09-10 16:22 ` David Hildenbrand
2019-09-11 9:23 ` Michael S. Tsirkin
2019-09-11 9:50 ` David Hildenbrand
2019-09-10 17:52 ` Michal Hocko
2019-09-10 18:00 ` Michal Hocko
2019-09-10 20:37 ` Alexander Duyck
2019-09-10 21:23 ` Alexander Duyck
2019-09-11 11:36 ` Michal Hocko
2019-09-11 11:47 ` David Hildenbrand
2019-09-11 12:08 ` Michael S. Tsirkin
2019-09-11 12:19 ` Michal Hocko
2019-09-11 12:25 ` Michal Hocko
2019-09-11 12:42 ` David Hildenbrand
2019-09-11 12:54 ` Michal Hocko
2019-09-11 13:03 ` David Hildenbrand
2019-09-11 13:20 ` Michal Hocko
2019-09-11 13:51 ` Michal Hocko
2019-09-11 16:09 ` David Hildenbrand
2019-09-12 7:16 ` Michal Hocko
2019-09-12 7:47 ` David Hildenbrand
2019-09-12 9:26 ` Michal Hocko
2019-09-12 12:00 ` Nitesh Narayan Lal
2019-09-11 14:03 ` Nitesh Narayan Lal
2019-09-11 16:02 ` David Hildenbrand
2019-09-11 13:19 ` Nitesh Narayan Lal
2019-09-11 12:55 ` Nitesh Narayan Lal
2019-09-11 15:12 ` Alexander Duyck
2019-09-12 9:19 ` Michal Hocko
2019-09-12 10:24 ` Kirill A. Shutemov
2019-09-12 11:11 ` Michal Hocko
2019-09-12 15:42 ` Alexander Duyck
2019-09-12 16:35 ` Mel Gorman
2019-09-12 17:48 ` Alexander Duyck
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