lmkd: Implement pid purge command to clear old pids when zygote restarts am: c89be17730 (1e8187f2) · Commits · e / os / android_system_core

lmkd/include/lmkd.h

+10 −0

Original line number	Diff line number	Diff line
		@@ -30,6 +30,7 @@ enum lmk_cmd {
		LMK_TARGET = 0, /* Associate minfree with oom_adj_score */
		LMK_PROCPRIO, /* Register a process and set its oom_adj_score */
		LMK_PROCREMOVE, /* Unregister a process */
		LMK_PROCPURGE, /* Purge all registered processes */
		};

		/*
		@@ -142,6 +143,15 @@ inline size_t lmkd_pack_set_procremove(LMKD_CTRL_PACKET packet,
		return 2 * sizeof(int);
		}

		/*
		* Prepare LMK_PROCPURGE packet and return packet size in bytes.
		* Warning: no checks performed, caller should ensure valid parameters.
		*/
		inline size_t lmkd_pack_set_procpurge(LMKD_CTRL_PACKET packet) {
		packet[0] = htonl(LMK_PROCPURGE);
		return sizeof(int);
		}

		__END_DECLS

		#endif /* _LMKD_H_ */

+30 −0

Original line number	Diff line number	Diff line
		@@ -619,6 +619,31 @@ static void cmd_procremove(LMKD_CTRL_PACKET packet) {
		pid_remove(params.pid);
		}

		static void cmd_procpurge() {
		int i;
		struct proc *procp;
		struct proc *next;

		if (use_inkernel_interface) {
		return;
		}

		for (i = 0; i <= ADJTOSLOT(OOM_SCORE_ADJ_MAX); i++) {
		procadjslot_list[i].next = &procadjslot_list[i];
		procadjslot_list[i].prev = &procadjslot_list[i];
		}

		for (i = 0; i < PIDHASH_SZ; i++) {
		procp = pidhash[i];
		while (procp) {
		next = procp->pidhash_next;
		free(procp);
		procp = next;
		}
		}
		memset(&pidhash[0], 0, sizeof(pidhash));
		}

		static void cmd_target(int ntargets, LMKD_CTRL_PACKET packet) {
		int i;
		struct lmk_target target;
		@@ -761,6 +786,11 @@ static void ctrl_command_handler(int dsock_idx) {
		goto wronglen;
		cmd_procremove(packet);
		break;
		case LMK_PROCPURGE:
		if (nargs != 0)
		goto wronglen;
		cmd_procpurge();
		break;
		default:
		ALOGE("Received unknown command code %d", cmd);
		return;