On Tue, Jun 26, 2012 at 01:32:58PM -0700, Frank Swiderski wrote:
> +static void fill_balloon(struct virtio_balloon *vb, size_t num)
> +{
> + int err;
> +
> + /* We can only do one array worth at a time. */
> + num = min(num, ARRAY_SIZE(vb->pfns));
> +
> + for (vb->num_pfns = 0; vb->num_pfns < num; vb->num_pfns++) {
> + struct page *page;
> + unsigned long inode_pfn = find_available_inode_page(vb);
> + /* Should always be able to find a page. */
> + BUG_ON(!inode_pfn);
> + page = read_mapping_page(the_inode.inode.i_mapping, inode_pfn,
> + NULL);
> + if (IS_ERR(page)) {
> + if (printk_ratelimit())
> + dev_printk(KERN_INFO, &vb->vdev->dev,
> + "Out of puff! Can't get %zu pages\n",
> + num);
> + break;
> + }
> +
> + /* Set the page to be dirty */
> + set_page_dirty(page);
> +
> + vb->pfns[vb->num_pfns] = page_to_pfn(page);
> + }
> +
> + /* Didn't get any? Oh well. */
> + if (vb->num_pfns == 0)
> + return;
Went to look at this driver, and noticed caller will re-invoke
this immediately if this triggers, so we busy-wait
re-trying this. When does read_mapping_page fail?
Is there any condition we could wait on?
--
MST
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