Pack JIT mini-debug-infos together.

We currently produce one in-memory ELF file per JITed method,
which has significant overheads due to the ELF file headers.

Pack several of those files together regularly to save space.
Similarly, prune information about methods which were GCed.

This reduces the size of JIT mini-debug-info by factor of 10.
The final overhead is 5% to 10% relative to the JIT code size.

Test: ./art/test.py -b -r -t 137
Change-Id: Idfaff8ed9a209e871e815e527f24f36c63a57bbf

1 files changed, 6 insertions, 8 deletions

diff --git a/compiler/optimizing/optimizing_compiler.cc b/compiler/optimizing/optimizing_compiler.cc
index c9b4d36bc4..4936a6d3c0 100644
--- a/compiler/optimizing/optimizing_compiler.cc
+++ b/compiler/optimizing/optimizing_compiler.cc
@@ -1456,8 +1456,8 @@ bool OptimizingCompiler::JitCompile(Thread* self,
   return true;
 }
 
-void OptimizingCompiler::GenerateJitDebugInfo(
-    ArtMethod* method, const debug::MethodDebugInfo& info) {
+void OptimizingCompiler::GenerateJitDebugInfo(ArtMethod* method ATTRIBUTE_UNUSED,
+                                              const debug::MethodDebugInfo& info) {
   const CompilerOptions& compiler_options = GetCompilerDriver()->GetCompilerOptions();
   DCHECK(compiler_options.GenerateAnyDebugInfo());
 
@@ -1472,12 +1472,10 @@ void OptimizingCompiler::GenerateJitDebugInfo(
       info);
   AddNativeDebugInfoForJit(Thread::Current(),
                            reinterpret_cast<const void*>(info.code_address),
-                           elf_file);
-
-  VLOG(jit)
-      << "JIT mini-debug-info added for " << ArtMethod::PrettyMethod(method)
-      << " size=" << PrettySize(elf_file.size())
-      << " total_size=" << PrettySize(GetJitMiniDebugInfoMemUsage());
+                           elf_file,
+                           debug::PackElfFileForJIT,
+                           compiler_options.GetInstructionSet(),
+                           compiler_options.GetInstructionSetFeatures());
 }
 
 }  // namespace art