> > +/* > > + * VIRTIO_BALLOON_PFNS_LIMIT is used to limit the size of page bitmap > > + * to prevent a very large page bitmap, there are two reasons for this: > > + * 1) to save memory. > > + * 2) allocate a large bitmap may fail. > > + * > > + * The actual limit of pfn is determined by: > > + * pfn_limit = min(max_pfn, VIRTIO_BALLOON_PFNS_LIMIT); > > + * > > + * If system has more pages than VIRTIO_BALLOON_PFNS_LIMIT, we will > > +scan > > + * the page list and send the PFNs with several times. To reduce the > > + * overhead of scanning the page list. VIRTIO_BALLOON_PFNS_LIMIT > > +should > > + * be set with a value which can cover most cases. > > + */ > > +#define VIRTIO_BALLOON_PFNS_LIMIT ((32 * (1ULL << 30)) >> > PAGE_SHIFT) > > +/* 32GB */ > > + > > static int oom_pages = OOM_VBALLOON_DEFAULT_PAGES; > > module_param(oom_pages, int, S_IRUSR | S_IWUSR); > > MODULE_PARM_DESC(oom_pages, "pages to free on OOM"); > > > > +extern unsigned long get_max_pfn(void); > > + > > Please just include the correct header. No need for this hackery. > Will change. Thanks! Liang _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
