| Index: src/flag-definitions.h
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| diff --git a/src/flag-definitions.h b/src/flag-definitions.h
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| index 149c65d1a3a68c754ece9c69d933b00b724ddb84..09af638d6f7a54bb3e3736dd14af6cbc8d11fde7 100644
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| --- a/src/flag-definitions.h
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| +++ b/src/flag-definitions.h
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| @@ -408,6 +408,10 @@ DEFINE_bool(trace_incremental_marking, false,
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|              "trace progress of the incremental marking")
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|  DEFINE_bool(track_gc_object_stats, false,
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|              "track object counts and memory usage")
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| +DEFINE_bool(parallel_sweeping, false, "enable parallel sweeping")
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| +DEFINE_bool(concurrent_sweeping, false, "enable concurrent sweeping")
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| +DEFINE_int(sweeper_threads, 1,
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| +           "number of parallel and concurrent sweeping threads")
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|  #ifdef VERIFY_HEAP
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|  DEFINE_bool(verify_heap, false, "verify heap pointers before and after GC")
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|  #endif
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| 
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