diff options
| -rw-r--r-- | hw/virtio/virtio-balloon.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c index 77532e80d5..2112874055 100644 --- a/hw/virtio/virtio-balloon.c +++ b/hw/virtio/virtio-balloon.c @@ -119,6 +119,8 @@ static void balloon_deflate_page(VirtIOBalloon *balloon, RAMBlock *rb; size_t rb_page_size; ram_addr_t ram_offset, host_page_base; + void *host_addr; + int ret; /* XXX is there a better way to get to the RAMBlock than via a * host address? */ @@ -147,6 +149,17 @@ static void balloon_deflate_page(VirtIOBalloon *balloon, balloon->pbp = NULL; } } + + host_addr = (void *)((uintptr_t)addr & ~(rb_page_size - 1)); + + /* When a page is deflated, we hint the whole host page it lives + * on, since we can't do anything smaller */ + ret = qemu_madvise(host_addr, rb_page_size, QEMU_MADV_WILLNEED); + if (ret != 0) { + warn_report("Couldn't MADV_WILLNEED on balloon deflate: %s", + strerror(errno)); + /* Otherwise ignore, failing to page hint shouldn't be fatal */ + } } static const char *balloon_stat_names[] = { |