Commit ab16dd10 authored May 15, 2017 by Christopher Ferris

Set the decay timer for all forked apps.

This will cause native memory frees to be less expensive, but it will cost
a bit of PSS that might hang around.

Bug: 36401135

Test: Built and booted bullhead.
Test: Ran jemalloc unit tests.
Test: Ran bionic unit tests.
Test: Ran a test that allocated and free'd a large piece of memory,
Test: and verified that after changing the parameter, the PSS
Test: sticks around (decay timer set to 1), the PSS is purged (decay
Test: timer set to 0).
Change-Id: I140b26986f3f81fddd5b9ed9c9e4f2d4977b819b

parent f465d84e

core/jni/com_android_internal_os_Zygote.cpp

+4 −0

Original line number	Diff line number	Diff line
		@@ -27,6 +27,7 @@
		#include <fcntl.h>
		#include <grp.h>
		#include <inttypes.h>
		#include <malloc.h>
		#include <mntent.h>
		#include <paths.h>
		#include <signal.h>
		@@ -519,6 +520,9 @@ static pid_t ForkAndSpecializeCommon(JNIEnv* env, uid_t uid, gid_t gid, jintArra
		// The child process.
		gMallocLeakZygoteChild = 1;

		// Set the jemalloc decay time to 1.
		mallopt(M_DECAY_TIME, 1);

		// Clean up any descriptors which must be closed immediately
		DetachDescriptors(env, fdsToClose);