Backed out changeset 350af7271fad (bug 1892242) for causing SM bustages in testGCOutOfMemory.cpp.

js/public/HeapAPI.h

@@ -380,7 +380,7 @@ enum StackKind {
  * initial value. In the browser this configured by the
  * javascript.options.mem.nursery.max_kb pref.
  */
-const uint32_t DefaultNurseryMaxBytes = 64 * js::gc::ChunkSize;
+const uint32_t DefaultNurseryMaxBytes = 16 * js::gc::ChunkSize;
 
 /* Default maximum heap size in bytes to pass to JS_NewContext(). */
 const uint32_t DefaultHeapMaxBytes = 32 * 1024 * 1024;

modules/libpref/init/all.js

@@ -942,7 +942,7 @@ pref("javascript.options.mem.max", -1);
 
 // JSGC_MIN_NURSERY_BYTES / JSGC_MAX_NURSERY_BYTES
 pref("javascript.options.mem.nursery.min_kb", 256);
-pref("javascript.options.mem.nursery.max_kb", 65536);
+pref("javascript.options.mem.nursery.max_kb", 16384);
 
 // JSGC_MODE
 pref("javascript.options.mem.gc_per_zone", true);