Combine madvise for clearing region space
Reduce how many madvise calls there are so that the mmap semaphore
has less contention.
Reduces the number of madvice calls from clearing regions when doing
few random camera gestures by ~80%.
Test: test-art-host
Bug: 62194020
(cherry picked from commit 1f0dc6f98833ece47617e45e3ad9689f4b248b80)
Change-Id: I506722f3d26d392278fdc68120bb64eec0768ddf
diff --git a/runtime/mem_map.cc b/runtime/mem_map.cc
index 6c39361..12793e4 100644
--- a/runtime/mem_map.cc
+++ b/runtime/mem_map.cc
@@ -952,6 +952,9 @@
}
void ZeroAndReleasePages(void* address, size_t length) {
+ if (length == 0) {
+ return;
+ }
uint8_t* const mem_begin = reinterpret_cast<uint8_t*>(address);
uint8_t* const mem_end = mem_begin + length;
uint8_t* const page_begin = AlignUp(mem_begin, kPageSize);