On Thu, Jan 10, 2008 at 04:11:51PM +0900, Akio Takebe wrote:
> Hi, Marcelo
>
> >+struct balloon_buf *alloc_balloon_buf(struct virtio_device *vdev, gfp_t
> >flags)
> >+{
> >+ struct balloon_buf *buf;
> >+
> >+ buf = kzalloc(sizeof(struct balloon_buf), flags);
> >+ if (!buf)
> >+ dev_printk(KERN_ERR, &vdev->dev, "%s: alloc fail\n", __func__);
> >+
> >+ return buf;
> >+}
> >+
> [snip..]
> >+static int kvm_balloon_inflate(struct virtballoon *v, int32_t npages)
> >+{
> >+ LIST_HEAD(tmp_list);
> >+ struct page *page, *tmp;
> >+ struct balloon_buf *buf;
> >+ u32 *pfn;
> >+ int allocated = 0;
> >+ int i, r = -ENOMEM;
> >+
> >+ buf = alloc_balloon_buf(v->vdev, GFP_KERNEL);
> When does balloon driver free the buf?
Hi Akio,
The buffers are passed from the virtio handling routine to the balloon_thread
through the balloon_work list, and then freed here:
+ spin_lock_irq(&v->queue_lock);
+ while (!list_empty(&v->balloon_work)) {
+ struct balloon_work *work;
+ struct balloon_buf *buf;
+
+ work = list_entry(v->balloon_work.next,
+ struct balloon_work, list);
+ list_del(&work->list);
+ spin_unlock_irq(&v->queue_lock);
+ buf = work->buf;
+ kfree(work);
+
+ switch(buf->hdr.cmd) {
+ case CMD_BALLOON_DEFLATE:
+ deflate_done(v, buf);
+ break;
+ case CMD_BALLOON_INFLATE:
+ inflate_done(v, buf);
+ break;
+ default:
+ printk("%s: unknown cmd 0x%x\n", __func__,
+ buf->hdr.cmd);
+ }
+ kfree(buf);
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