return -1;
}
+ // It might be a partial read:
count -= n;
data += n;
offset += n;
}
}
-/** @brief Reset the softdirty bits
+/** @brief Reset the soft-dirty bits
*
* This is done after checkpointing and after checkpoint restoration
* (if per page checkpoiting is used) in order to know which pages were
* modified.
+ *
+ * See https://www.kernel.org/doc/Documentation/vm/soft-dirty.txt
* */
void mc_softdirty_reset() {
mc_ensure_fd(&mc_model_checker->fd_clear_refs, "/proc/self/clear_refs", O_WRONLY|O_CLOEXEC);
}
}
-/** @brief Read /proc/self/pagemap informations in order to find properties on the pages
+/** @brief Read memory page informations
*
- * For each virtual memory page, this file provides informations.
+ * For each virtual memory page of the process,
+ * /proc/self/pagemap provides a 64 bit field of information.
* We are interested in the soft-dirty bit: with this we can track which
* pages were modified between snapshots/restorations and avoid
* copying data which was not modified.
*
+ * See https://www.kernel.org/doc/Documentation/vm/pagemap.txt
+ *
* @param pagemap Output buffer for pagemap informations
* @param start_addr Address of the first page
* @param page_count Number of pages