Compilation filter
This CL introduces a static compilation filter mechanism intended
to allow us to reduce compilation time and space requirements until
we have a profiling mechanism in place.
It supports 5 modes of filtering:
o interpret-only (compile nothing)
o deferred-compilation (compile only those methods believe to be
compute-intensive)
o space (optimized for space)
o balanced (best return on space investment)
o speed (compile everything)
A future CL will allow the default filtering mode to be set
via system property. For now, you can pass it in via command
line as follows:
dalvikvm -compiler-filter:[interpret-only|defer-compilation|
space|balanced|speed]
or dex2oat --runtime-arg -compiler-filter:[one of the above modes]
Creating a file named art/SMALL_ART will force the filter
default to interpret-only. Later on we'll move this capability
to a persistent system property.
or modify kDefaultCompilerFilter in runtime.h
It also changes the compiler driver to allow the compilers to
decline to compile a method by return NULL.
Change-Id: Ic73411818f8bb845a4a19a05b0395c50902c534f
(cherry picked from commit a024a0686c3b0fea13f362bff70d65981e5febc5)diff --git a/compiler/dex/frontend.cc b/compiler/dex/frontend.cc
index 9cc4d18..8da1520 100644
--- a/compiler/dex/frontend.cc
+++ b/compiler/dex/frontend.cc
@@ -103,6 +103,7 @@
// (1 << kDebugDumpBitcodeFile) |
// (1 << kDebugVerifyBitcode) |
// (1 << kDebugShowSummaryMemoryUsage) |
+ // (1 << kDebugShowFilterStats) |
0;
static CompiledMethod* CompileMethod(CompilerDriver& compiler,
@@ -180,6 +181,10 @@
cu->mir_graph->InlineMethod(code_item, access_flags, invoke_type, class_def_idx, method_idx,
class_loader, dex_file);
+ if (cu->mir_graph->SkipCompilation(Runtime::Current()->GetCompilerFilter())) {
+ return NULL;
+ }
+
/* Do a code layout pass */
cu->mir_graph->CodeLayout();