// ***** Region management:
+/** @brief Take a per-page snapshot of a region
+ *
+ * @param data The start of the region (must be at the beginning of a page)
+ * @param pag_count Number of pages of the region
+ * @param pagemap Linux kernel pagemap values fot this region (or NULL)
+ * @param reference_pages Snapshot page numbers of the previous soft_dirty_reset (or NULL)
+ * @return Snapshot page numbers of this new snapshot
+ */
size_t* mc_take_page_snapshot_region(void* data, size_t page_count, uint64_t* pagemap, size_t* reference_pages)
{
size_t* pagenos = (size_t*) malloc(page_count * sizeof(size_t));
for (size_t i=0; i!=page_count; ++i) {
bool softclean = pagemap && !(pagemap[i] & SOFT_DIRTY);
- if (softclean) {
+ if (softclean && reference_pages) {
// The page is softclean, it is the same page as the reference page:
pagenos[i] = reference_pages[i];
mc_model_checker->pages->ref_page(reference_pages[i]);
}
}
+/** @brief Restore a snapshot of a region
+ *
+ * If possible, the restoration will be incremental
+ * (the modified pages will not be touched).
+ *
+ * @param data The start of the region (must be at the beginning of a page)
+ * @param pag_count Number of pages of the region
+ * @param pagemap Linux kernel pagemap values fot this region (or NULL)
+ * @param reference_pages Snapshot page numbers of the previous soft_dirty_reset (or NULL)
+ */
void mc_restore_page_snapshot_region(mc_mem_region_t region, size_t page_count, uint64_t* pagemap, mc_mem_region_t reference_region)
{
for (size_t i=0; i!=page_count; ++i) {