Another overhaul of the recent_activity / idle GC handling (#5991)

Improvements:

 - we now turn off the timer signal in the non-threaded RTS after
   idleGCDelay.  This should make the xmonad users on #5991 happy.

 - we now turn off the timer signal after idleGCDelay even if the
   idle GC is disabled with +RTS -I0.

 - we now do *not* turn off the timer when profiling.

 - more comments to explain the meaning of the various ACTIVITY_*
   values

1 files changed, 1 insertions, 0 deletions

diff --git a/includes/rts/Flags.h b/includes/rts/Flags.h
index da71a4bf83..9ca7fb9f7e 100644
--- a/includes/rts/Flags.h
+++ b/includes/rts/Flags.h
@@ -53,6 +53,7 @@ struct GC_FLAGS {
     rtsBool frontpanel;
 
     Time    idleGCDelayTime;    /* units: TIME_RESOLUTION */
+    rtsBool doIdleGC;
 
     StgWord heapBase;           /* address to ask the OS for memory */
 };