commit a17c2b694ce53a484f534ba7abab7ec12cd4ffcc
author David Srbecky <dsrbecky@google.com> Tue Apr 14 16:59:27 2020 +0100
committer Christopher Ferris <cferris@google.com> Thu Apr 16 15:03:19 2020 -0700
tree 9fbc74ee5582c15d71067201c46b7c5b3d554035
parent 8c6d5bf83c9551264932e8d4268870cc26567fed

Optimize Memory::ReadString

This function is responsible for majority of CPU time in prefetto.

Reduce the number of memory reads (don't read strings byte-by-byte).

Update all calls of ReadString to include the third parameter to have
a max read.

Add an Elf creation benchmark since this function is on the elf
creation path.

Test: libunwindstack_unit_test
Change-Id: Ia36e1f1a5ba76c9e9f13c43fb9e3691dde7897f2

libunwindstack/Android.bp

diff --git a/libunwindstack/Android.bp b/libunwindstack/Android.bp
index ab59a4b..21da12d 100644
--- a/libunwindstack/Android.bp
+++ b/libunwindstack/Android.bp
@@ -373,7 +373,9 @@
 
     srcs: [
         "benchmarks/unwind_benchmarks.cpp",
+        "benchmarks/ElfBenchmark.cpp",
         "benchmarks/SymbolBenchmark.cpp",
+        "benchmarks/Utils.cpp",
     ],
 
     data: [