+void filter_tally(struct obd_export *exp, struct page **pages, int nr_pages,
+ unsigned long *blocks, int blocks_per_page, int wr)
+{
+ struct filter_obd *filter = &exp->exp_obd->u.filter;
+ struct filter_export_data *fed = &exp->exp_filter_data;
+ struct page *last_page = NULL;
+ unsigned long *last_block = NULL;
+ unsigned long discont_pages = 0;
+ unsigned long discont_blocks = 0;
+ int i;
+
+ if (nr_pages == 0)
+ return;
+
+ lprocfs_oh_tally_log2(&filter->fo_filter_stats.hist[BRW_R_PAGES + wr],
+ nr_pages);
+ lprocfs_oh_tally_log2(&fed->fed_brw_stats.hist[BRW_R_PAGES + wr],
+ nr_pages);
+
+ while (nr_pages-- > 0) {
+ if (last_page && (*pages)->index != (last_page->index + 1))
+ discont_pages++;
+ last_page = *pages;
+ pages++;
+ for (i = 0; i < blocks_per_page; i++) {
+ if (last_block && *blocks != (*last_block + 1))
+ discont_blocks++;
+ last_block = blocks++;
+ }
+ }
+
+ lprocfs_oh_tally(&filter->fo_filter_stats.hist[BRW_R_DISCONT_PAGES +wr],
+ discont_pages);
+ lprocfs_oh_tally(&fed->fed_brw_stats.hist[BRW_R_DISCONT_PAGES + wr],
+ discont_pages);
+ lprocfs_oh_tally(&filter->fo_filter_stats.hist[BRW_R_DISCONT_BLOCKS+wr],
+ discont_blocks);
+ lprocfs_oh_tally(&fed->fed_brw_stats.hist[BRW_R_DISCONT_BLOCKS + wr],
+ discont_blocks);
+}
+
+#define pct(a,b) (b ? a * 100 / b : 0)
+
+static void display_brw_stats(struct seq_file *seq, char *name, char *units,
+ struct obd_histogram *read, struct obd_histogram *write, int log2)
+{
+ unsigned long read_tot, write_tot, r, w, read_cum = 0, write_cum = 0;
+ int i;
+
+ seq_printf(seq, "\n%26s read | write\n", " ");
+ seq_printf(seq, "%-22s %-5s %% cum %% | %-5s %% cum %%\n",
+ name, units, units);
+
+ read_tot = lprocfs_oh_sum(read);
+ write_tot = lprocfs_oh_sum(write);
+ for (i = 0; i < OBD_HIST_MAX; i++) {
+ r = read->oh_buckets[i];
+ w = write->oh_buckets[i];
+ read_cum += r;
+ write_cum += w;
+ if (read_cum == 0 && write_cum == 0)
+ continue;
+
+ if (!log2)
+ seq_printf(seq, "%u", i);
+ else if (i < 10)
+ seq_printf(seq, "%u", 1<<i);
+ else if (i < 20)
+ seq_printf(seq, "%uK", 1<<(i-10));
+ else
+ seq_printf(seq, "%uM", 1<<(i-20));
+
+ seq_printf(seq, ":\t\t%10lu %3lu %3lu | %4lu %3lu %3lu\n",
+ r, pct(r, read_tot), pct(read_cum, read_tot),
+ w, pct(w, write_tot), pct(write_cum, write_tot));
+
+ if (read_cum == read_tot && write_cum == write_tot)
+ break;
+ }
+}
+
+static void brw_stats_show(struct seq_file *seq, struct brw_stats *brw_stats)
+{
+ struct timeval now;
+
+ /* this sampling races with updates */
+ do_gettimeofday(&now);
+ seq_printf(seq, "snapshot_time: %lu.%lu (secs.usecs)\n",
+ now.tv_sec, now.tv_usec);
+
+ display_brw_stats(seq, "pages per bulk r/w", "rpcs",
+ &brw_stats->hist[BRW_R_PAGES],
+ &brw_stats->hist[BRW_W_PAGES], 1);
+
+ display_brw_stats(seq, "discontiguous pages", "rpcs",
+ &brw_stats->hist[BRW_R_DISCONT_PAGES],
+ &brw_stats->hist[BRW_W_DISCONT_PAGES], 0);
+
+ display_brw_stats(seq, "discontiguous blocks", "rpcs",
+ &brw_stats->hist[BRW_R_DISCONT_BLOCKS],
+ &brw_stats->hist[BRW_W_DISCONT_BLOCKS], 0);
+
+ display_brw_stats(seq, "disk fragmented I/Os", "ios",
+ &brw_stats->hist[BRW_R_DIO_FRAGS],
+ &brw_stats->hist[BRW_W_DIO_FRAGS], 0);
+
+ display_brw_stats(seq, "disk I/Os in flight", "ios",
+ &brw_stats->hist[BRW_R_RPC_HIST],
+ &brw_stats->hist[BRW_W_RPC_HIST], 0);
+
+ {
+ char title[24];
+ sprintf(title, "I/O time (1/%ds)", HZ);
+ display_brw_stats(seq, title, "ios",
+ &brw_stats->hist[BRW_R_IO_TIME],
+ &brw_stats->hist[BRW_W_IO_TIME], 1);
+ }
+
+ display_brw_stats(seq, "disk I/O size", "ios",
+ &brw_stats->hist[BRW_R_DISK_IOSIZE],
+ &brw_stats->hist[BRW_W_DISK_IOSIZE], 1);
+}
+
+static int filter_brw_stats_seq_show(struct seq_file *seq, void *v)
+{
+ struct obd_device *dev = seq->private;
+ struct filter_obd *filter = &dev->u.filter;
+
+ brw_stats_show(seq, &filter->fo_filter_stats);
+
+ return 0;
+}
+
+static ssize_t filter_brw_stats_seq_write(struct file *file, const char *buf,
+ size_t len, loff_t *off)
+{
+ struct seq_file *seq = file->private_data;
+ struct obd_device *dev = seq->private;
+ struct filter_obd *filter = &dev->u.filter;
+ int i;
+
+ for (i = 0; i < BRW_LAST; i++)
+ lprocfs_oh_clear(&filter->fo_filter_stats.hist[i]);
+
+ return len;
+}
+
+LPROC_SEQ_FOPS(filter_brw_stats);
+
+int lproc_filter_attach_seqstat(struct obd_device *dev)
+{
+ return lprocfs_obd_seq_create(dev, "brw_stats", 0444,
+ &filter_brw_stats_fops, dev);
+}
+
+static int filter_per_export_stats_seq_show(struct seq_file *seq, void *v)
+{
+ struct filter_export_data *fed = seq->private;
+
+ brw_stats_show(seq, &fed->fed_brw_stats);
+
+ return 0;
+}
+
+static ssize_t filter_per_export_stats_seq_write(struct file *file,
+ const char *buf, size_t len, loff_t *off)
+{
+ struct seq_file *seq = file->private_data;
+ struct filter_export_data *fed = seq->private;
+ int i;
+
+ for (i = 0; i < BRW_LAST; i++)
+ lprocfs_oh_clear(&fed->fed_brw_stats.hist[i]);
+
+ return len;
+}
+
+LPROC_SEQ_FOPS(filter_per_export_stats);
+
+void lprocfs_filter_init_vars(struct lprocfs_static_vars *lvars)
+{
+ lvars->module_vars = lprocfs_filter_module_vars;
+ lvars->obd_vars = lprocfs_filter_obd_vars;
+}