Reduce signal sender thread stack size to 32k.

src/heap.cc

Index: src/heap.cc
===================================================================
--- src/heap.cc	(revision 10282)
+++ src/heap.cc	(working copy)
@@ -580,6 +580,7 @@
   PagedSpace* map_space = Heap::map_space();
   PagedSpace* cell_space = Heap::cell_space();
   LargeObjectSpace* lo_space = Heap::lo_space();
+  bool one_gc_has_been_performed = false;
   bool gc_performed = true;
   while (gc_performed) {
     gc_performed = false;
@@ -615,10 +616,17 @@
     // allocation in the other spaces.
     large_object_size += cell_space_size + map_space_size + code_space_size +
         data_space_size + pointer_space_size;
-    if (!(lo_space->ReserveSpace(large_object_size))) {
+
+    // If we already did one GC in order to make space in old space, there is
+    // no sense in doing another one.  We will attempt to force through the
+    // large object space allocation, which comes directly from the OS,
+    // regardless of any soft limit.
+    if (!one_gc_has_been_performed &&
+        !(lo_space->ReserveSpace(large_object_size))) {
       Heap::CollectGarbage(LO_SPACE);
       gc_performed = true;
     }
+    if (gc_performed) one_gc_has_been_performed = true;

[Vyacheslav Egorov (Chromium), 2011/12/21 13:22:12]

scavenge will not free any space in LO.

gc_performed does not imply full_gc_performed.

   }
 }
 
@@ -5301,8 +5309,8 @@
 
   // The new space size must be a power of two to support single-bit testing
   // for containment.
-  max_semispace_size_ = RoundUpToPowerOf2(max_semispace_size_);
-  reserved_semispace_size_ = RoundUpToPowerOf2(reserved_semispace_size_);
+  max_semispace_size_ = SignedRoundUpToPowerOf2(max_semispace_size_);

[Vyacheslav Egorov (Chromium), 2011/12/21 13:22:12]

what's the point of these fields being signed? looks ugly.

+  reserved_semispace_size_ = SignedRoundUpToPowerOf2(reserved_semispace_size_);
   initial_semispace_size_ = Min(initial_semispace_size_, max_semispace_size_);
   external_allocation_limit_ = 10 * max_semispace_size_;