tweak hpb stats destructor output

Including the last rb_gc_count() call would be useful, and
avoid showing giant SIZE_MAX initializers for acc.min fields.

1 files changed, 9 insertions, 4 deletions

diff --git a/ext/mwrap/mwrap.c b/ext/mwrap/mwrap.c
index 138384d..b60c21d 100644
--- a/ext/mwrap/mwrap.c
+++ b/ext/mwrap/mwrap.c
@@ -1351,21 +1351,26 @@ static void dump_hpb(FILE *fp, unsigned flags)
         if (flags & DUMP_HPB_STATS) {
                 fprintf(fp,
                         "lifespan_max: %zu\n"
-                        "lifespan_min: %zu\n"
+                        "lifespan_min:%s%zu\n"
                         "lifespan_mean: %0.3f\n"
                         "lifespan_stddev: %0.3f\n"
                         "deathspan_max: %zu\n"
-                        "deathspan_min: %zu\n"
+                        "deathspan_min:%s%zu\n"
                         "deathspan_mean: %0.3f\n"
-                        "deathspan_stddev: %0.3f\n",
+                        "deathspan_stddev: %0.3f\n"
+                        "gc_count: %zu\n",
                         hpb_stats.alive.max,
+                        hpb_stats.alive.min == SIZE_MAX ? " -" : " ",
                         hpb_stats.alive.min,
                         hpb_stats.alive.mean,
                         acc_stddev_dbl(&hpb_stats.alive),
                         hpb_stats.reborn.max,
+                        hpb_stats.reborn.min == SIZE_MAX ? " -" : " ",
                         hpb_stats.reborn.min,
                         hpb_stats.reborn.mean,
-                        acc_stddev_dbl(&hpb_stats.reborn));
+                        acc_stddev_dbl(&hpb_stats.reborn),
+                        /* n.b.: unsafe to call rb_gc_count() in destructor */
+                        generation);
         }
         if (flags & DUMP_HPB_EACH) {
                 struct alloc_hdr *h;