Disable concurrent marking/sweeping, and background compilation on ARMv5TE

runtime/vm/pages.cc

Index: runtime/vm/pages.cc
diff --git a/runtime/vm/pages.cc b/runtime/vm/pages.cc
index 64b1d5e91f7d342c85cc9622fba2cd1d72c9db40..5609a6e0096a7f885ea86c1c1a1c789a14ceaf12 100644
--- a/runtime/vm/pages.cc
+++ b/runtime/vm/pages.cc
@@ -17,6 +17,14 @@
 
 namespace dart {
 
+// Disable concurrent sweeping by default on armv5te. The relevant
+// implementations are uniprocessors.
+#if defined(TARGET_ARCH_ARM_5TE)
+#define USING_CONCURRENT_SWEEP false
+#else
+#define USING_CONCURRENT_SWEEP true
+#endif
+
 DEFINE_FLAG(int, heap_growth_rate, 0,
             "The max number of pages the heap can grow at a time");
 DEFINE_FLAG(int, old_gen_growth_space_ratio, 20,
@@ -35,7 +43,7 @@ DEFINE_FLAG(bool, log_code_drop, false,
             "Emit a log message when pointers to unused code are dropped.");
 DEFINE_FLAG(bool, always_drop_code, false,
             "Always try to drop code if the function's usage counter is >= 0");
-DEFINE_FLAG(bool, concurrent_sweep, true,
+DEFINE_FLAG(bool, concurrent_sweep, USING_CONCURRENT_SWEEP,

[Ivan Posva, 2016/05/12 17:19:46]

ditto

[zra, 2016/05/12 19:54:21]

Done.

[zra, 2016/05/12 19:59:11]

That is, I moved concurrent_sweep. Moving the others, and changing some to
Release and Debug mode flags, broke the Product mode build a lot, so I'll make a
separate change to track everything down.

             "Concurrent sweep for old generation.");
 DEFINE_FLAG(bool, log_growth, false, "Log PageSpace growth policy decisions.");