Make sure Zygote is running at process priority 0 after VM has started. (8b238abd) · Commits · e / os / android_frameworks_base

core/jni/com_android_internal_os_Zygote.cpp

+21 −1

Original line number	Original line	Diff line number	Diff line
	@@ -37,6 +37,7 @@
	#include <sys/prctl.h>		#include <sys/prctl.h>
	#include <sys/resource.h>		#include <sys/resource.h>
	#include <sys/stat.h>		#include <sys/stat.h>
			#include <sys/time.h>
	#include <sys/types.h>		#include <sys/types.h>
	#include <sys/utsname.h>		#include <sys/utsname.h>
	#include <sys/wait.h>		#include <sys/wait.h>
	@@ -153,6 +154,24 @@ static void SetSigChldHandler() {
	}		}
	}		}

			// Resets nice priority for zygote process. Zygote priority can be set
			// to high value during boot phase to speed it up. We want to ensure
			// zygote is running at normal priority before childs are forked from it.
			//
			// This ends up being called repeatedly before each fork(), but there's
			// no real harm in that.
			static void ResetNicePriority(JNIEnv* env) {
			errno = 0;
			int prio = getpriority(PRIO_PROCESS, 0);
			if (prio == -1 && errno != 0) {
			ALOGW("getpriority failed: %s\n", strerror(errno));
			}
			if (prio != 0 && setpriority(PRIO_PROCESS, 0, 0) != 0) {
			ALOGE("setpriority(%d, 0, 0) failed: %s", PRIO_PROCESS, strerror(errno));
			RuntimeAbort(env, __LINE__, "setpriority failed");
			}
			}

	// Sets the SIGCHLD handler back to default behavior in zygote children.		// Sets the SIGCHLD handler back to default behavior in zygote children.
	static void UnsetSigChldHandler() {		static void UnsetSigChldHandler() {
	struct sigaction sa;		struct sigaction sa;
	@@ -486,6 +505,8 @@ static pid_t ForkAndSpecializeCommon(JNIEnv* env, uid_t uid, gid_t gid, jintArra
	RuntimeAbort(env, __LINE__, "Unable to restat file descriptor table.");		RuntimeAbort(env, __LINE__, "Unable to restat file descriptor table.");
	}		}

			ResetNicePriority(env);

	pid_t pid = fork();		pid_t pid = fork();

	if (pid == 0) {		if (pid == 0) {
	@@ -774,4 +795,3 @@ int register_com_android_internal_os_Zygote(JNIEnv* env) {
	return RegisterMethodsOrDie(env, "com/android/internal/os/Zygote", gMethods, NELEM(gMethods));		return RegisterMethodsOrDie(env, "com/android/internal/os/Zygote", gMethods, NELEM(gMethods));
	}		}
	} // namespace android		} // namespace android