diff options
Diffstat (limited to 'runtime/stat-common.c')
| -rw-r--r-- | runtime/stat-common.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/runtime/stat-common.c b/runtime/stat-common.c index 7a6f439b..8b2f3cf3 100644 --- a/runtime/stat-common.c +++ b/runtime/stat-common.c @@ -133,11 +133,17 @@ static int _stp_val_to_bucket(int64_t val) #define HIST_WIDTH 50 #endif +#ifndef HIST_ELISION +#define HIST_ELISION 2 /* zeroes before and after */ +#endif + + static void _stp_stat_print_histogram (Hist st, stat *sd) { int scale, i, j, val_space, cnt_space; int low_bucket = -1, high_bucket = 0, over = 0, under = 0; int64_t val, v, max = 0; + int eliding = 0; if (st->type != HIST_LOG && st->type != HIST_LINEAR) return; @@ -215,8 +221,38 @@ static void _stp_stat_print_histogram (Hist st, stat *sd) _stp_print("value |"); reprint (HIST_WIDTH, "-"); _stp_print(" count\n"); + + eliding=0; for (i = low_bucket; i <= high_bucket; i++) { int over_under = 0; + + /* Elide consecutive zero buckets. Specifically, skip + this row if it is zero and some of its nearest + neighbours are also zero. */ + int k; + int elide=1; + for (k=i-HIST_ELISION; k<=i+HIST_ELISION; k++) + { + if (k >= 0 && k < st->buckets && sd->histogram[k] != 0) + elide = 0; + } + if (elide) + { + eliding = 1; + continue; + } + + /* State change: we have elided some rows, but now are about + to print a new one. So let's print a mark on the vertical + axis to represent the missing rows. */ + if (eliding) + { + reprint (val_space, " "); + _stp_print(" ~\n"); + eliding = 0; + } + + if (st->type == HIST_LINEAR) { if (i == 0) { /* underflow */ |