On Tue, Nov 19, 2019 at 2:17 AM Michael S. Tsirkin mst@redhat.com wrote:
virtio_balloon_shrinker_scan should return number of system pages freed, but because it's calling functions that deal with balloon pages, it gets confused and sometimes returns the number of balloon pages.
It does not matter practically as the exact number isn't used, but it seems better to be consistent in case someone starts using this API.
Further, if we ever tried to iteratively leak pages as virtio_balloon_shrinker_scan tries to do, we'd run into issues - this is because freed_pages was accumulating total freed pages, but was also subtracted on each iteration from pages_to_free, which can result in either leaking less memory than we were supposed to free, or or more if pages_to_free underruns.
On a system with 4K pages we are lucky that we are never asked to leak more than 128 pages while we can leak up to 256 at a time, but it looks like a real issue for systems with page size != 4K.
Cc: stable@vger.kernel.org Fixes: 71994620bb25 ("virtio_balloon: replace oom notifier with shrinker") Reported-by: Khazhismel Kumykov khazhy@google.com Reviewed-by: Wei Wang wei.w.wang@intel.com Signed-off-by: Michael S. Tsirkin mst@redhat.com
drivers/virtio/virtio_balloon.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-)
diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c index 226fbb995fb0..7cee05cdf3fb 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -772,6 +772,13 @@ static unsigned long shrink_free_pages(struct virtio_balloon *vb, return blocks_freed << VIRTIO_BALLOON_FREE_PAGE_ORDER; }
+static unsigned long leak_balloon_pages(struct virtio_balloon *vb,
unsigned long pages_to_free)+{
return leak_balloon(vb, pages_to_free * VIRTIO_BALLOON_PAGES_PER_PAGE) /VIRTIO_BALLOON_PAGES_PER_PAGE;+}
static unsigned long shrink_balloon_pages(struct virtio_balloon *vb, unsigned long pages_to_free) { @@ -782,11 +789,9 @@ static unsigned long shrink_balloon_pages(struct virtio_balloon *vb, * VIRTIO_BALLOON_ARRAY_PFNS_MAX balloon pages, so we call it * multiple times to deflate pages till reaching pages_to_free. */
while (vb->num_pages && pages_to_free) {pages_freed += leak_balloon(vb, pages_to_free) /VIRTIO_BALLOON_PAGES_PER_PAGE;pages_to_free -= pages_freed;}
while (vb->num_pages && pages_freed < pages_to_free)pages_freed += leak_balloon_pages(vb, pages_to_free);
pages_to_free - pages_freed ?
update_balloon_size(vb); return pages_freed;@@ -799,7 +804,7 @@ static unsigned long virtio_balloon_shrinker_scan(struct shrinker *shrinker, struct virtio_balloon *vb = container_of(shrinker, struct virtio_balloon, shrinker);
pages_to_free = sc->nr_to_scan * VIRTIO_BALLOON_PAGES_PER_PAGE;
pages_to_free = sc->nr_to_scan; if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) pages_freed = shrink_free_pages(vb, pages_to_free);-- MST