code review 5714049: runtime: run init on main thread

src/pkg/runtime/mheap.c

 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 // Page heap.
 //
 // See malloc.h for overview.
 //
 // When a MSpan is in the heap free list, state == MSpanFree
 // and heapmap(s->start) == span, heapmap(s->start+s->npages-1) == span.
@@ skipping 308 matching lines @@
         }
 
         // Insert s into appropriate list.
         if(s->npages < nelem(h->free))
                 runtime·MSpanList_Insert(&h->free[s->npages], s);
         else
                 runtime·MSpanList_Insert(&h->large, s);
 }
 
 // Release (part of) unused memory to OS.
-// Goroutine created in runtime·schedinit.
+// Goroutine created at startup.
 // Loop forever.
 void
 runtime·MHeap_Scavenger(void)
 {
         MHeap *h;
         MSpan *s, *list;
         uint64 tick, now, forcegc, limit;
         uint32 k, i;
         uintptr released, sumreleased;
         byte *env;
@@ skipping 112 matching lines @@
                 runtime·printf("failed MSpanList_Insert %p %p %p\n", span, span->next, span->prev);
                 runtime·throw("MSpanList_Insert");
         }
         span->next = list->next;
         span->prev = list;
         span->next->prev = span;
         span->prev->next = span;
 }