Add +RTS -vg flag for requesting some GC trace messages, outside DEBUG

DEBUG imposes a significant performance hit in the GC, yet we often
want some of the debugging output, so -vg gives us the cheap trace
messages without the sanity checking of DEBUG, just like -vs for the
scheduler.

1 files changed, 1 insertions, 1 deletions

diff --git a/rts/sm/GCUtils.c b/rts/sm/GCUtils.c
index 103430abed..636f23dc23 100644
--- a/rts/sm/GCUtils.c
+++ b/rts/sm/GCUtils.c
@@ -92,7 +92,7 @@ push_scan_block (bdescr *bd, step_workspace *ws)
     ASSERT(bd->link == NULL);
 
     // update stats: this is a block that has been copied & scavenged
-    copied += bd->free - bd->start;
+    gct->copied += bd->free - bd->start;
 
     // put the scan block on the ws->scavd_list.
     bd->link = ws->scavd_list;