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Tsirkin" To: Nico Pache Cc: linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, xen-devel@lists.xenproject.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, jerrin.shaji-george@broadcom.com, bcm-kernel-feedback-list@broadcom.com, arnd@arndb.de, gregkh@linuxfoundation.org, david@redhat.com, jasowang@redhat.com, xuanzhuo@linux.alibaba.com, eperezma@redhat.com, jgross@suse.com, sstabellini@kernel.org, oleksandr_tyshchenko@epam.com, akpm@linux-foundation.org, hannes@cmpxchg.org, mhocko@kernel.org, roman.gushchin@linux.dev, shakeel.butt@linux.dev, muchun.song@linux.dev, nphamcs@gmail.com, yosry.ahmed@linux.dev, kanchana.p.sridhar@intel.com, alexander.atanasov@virtuozzo.com Subject: Re: [RFC 2/5] virtio_balloon: update the NR_BALLOON_PAGES state Message-ID: <20250312025331-mutt-send-email-mst@kernel.org> References: <20250312000700.184573-1-npache@redhat.com> <20250312000700.184573-3-npache@redhat.com> Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: <20250312000700.184573-3-npache@redhat.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: SJMYBjED9-2iX7LfWQvlyAx8XuHyXjz_jFWu13BcwE4_1741762551 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Tue, Mar 11, 2025 at 06:06:57PM -0600, Nico Pache wrote: > Update the NR_BALLOON_PAGES counter when pages are added to or > removed from the virtio balloon. > > Signed-off-by: Nico Pache > --- > drivers/virtio/virtio_balloon.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c > index 89da052f4f68..406414dbb477 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -274,6 +274,8 @@ static unsigned int fill_balloon(struct virtio_balloon *vb, size_t num) > > set_page_pfns(vb, vb->pfns + vb->num_pfns, page); > vb->num_pages += VIRTIO_BALLOON_PAGES_PER_PAGE; > + mod_node_page_state(page_pgdat(page), NR_BALLOON_PAGES, > + VIRTIO_BALLOON_PAGES_PER_PAGE); > if (!virtio_has_feature(vb->vdev, > VIRTIO_BALLOON_F_DEFLATE_ON_OOM)) > adjust_managed_page_count(page, -1); This means the counter is in virtio balloon page units, which runs counter to the declared goal of making the interface hypervisor-agnostic. > @@ -324,6 +326,8 @@ static unsigned int leak_balloon(struct virtio_balloon *vb, size_t num) > set_page_pfns(vb, vb->pfns + vb->num_pfns, page); > list_add(&page->lru, &pages); > vb->num_pages -= VIRTIO_BALLOON_PAGES_PER_PAGE; > + mod_node_page_state(page_pgdat(page), NR_BALLOON_PAGES, > + -VIRTIO_BALLOON_PAGES_PER_PAGE); Same. Thanks, > } > > num_freed_pages = vb->num_pfns; > -- > 2.48.1