+ rra_start = rrd_file->header_len;
+ dontneed_start = PAGE_START(rra_start) + _page_size;
+ for (i = 0; i < rrd->stat_head->rra_cnt; ++i) {
+ active_block =
+ PAGE_START(rra_start
+ + rrd->rra_ptr[i].cur_row
+ * rrd->stat_head->ds_cnt * sizeof(rrd_value_t));
+ if (active_block > dontneed_start) {
+#ifdef USE_MADVISE
+ madvise(rrd_simple_file->file_start + dontneed_start,
+ active_block - dontneed_start - 1, MADV_DONTNEED);
+#endif
+/* in linux at least only fadvise DONTNEED seems to purge pages from cache */
+#ifdef HAVE_POSIX_FADVISE
+ posix_fadvise(rrd_simple_file->fd, dontneed_start,
+ active_block - dontneed_start - 1,
+ POSIX_FADV_DONTNEED);
+#endif
+ }
+ dontneed_start = active_block;
+ /* do not release 'hot' block if update for this RAA will occur
+ * within 10 minutes */
+ if (rrd->stat_head->pdp_step * rrd->rra_def[i].pdp_cnt -
+ rrd->live_head->last_up % (rrd->stat_head->pdp_step *
+ rrd->rra_def[i].pdp_cnt) < 10 * 60) {
+ dontneed_start += _page_size;
+ }
+ rra_start +=
+ rrd->rra_def[i].row_cnt * rrd->stat_head->ds_cnt *
+ sizeof(rrd_value_t);
+ }
+
+ if (dontneed_start < rrd_file->file_len) {
+#ifdef USE_MADVISE
+ madvise(rrd_simple_file->file_start + dontneed_start,
+ rrd_file->file_len - dontneed_start, MADV_DONTNEED);
+#endif
+#ifdef HAVE_POSIX_FADVISE
+ posix_fadvise(rrd_simple_file->fd, dontneed_start,
+ rrd_file->file_len - dontneed_start,
+ POSIX_FADV_DONTNEED);
+#endif
+ }
+
+#if defined DEBUG && DEBUG > 1
+ mincore_print(rrd_file, "after");