Merge "system: Add support for getting/setting i/o priorities and include a userspace tool" (1bfb4803) · Commits · e / os / android_system_core

include/cutils/iosched_policy.h

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		/*
		* Copyright (C) 2007 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		#ifndef __CUTILS_IOSCHED_POLICY_H
		#define __CUTILS_IOSCHED_POLICY_H

		#ifdef __cplusplus
		extern "C" {
		#endif

		typedef enum {
		IoSchedClass_NONE,
		IoSchedClass_RT,
		IoSchedClass_BE,
		IoSchedClass_IDLE,
		} IoSchedClass;

		extern int android_set_ioprio(int pid, IoSchedClass clazz, int ioprio);
		extern int android_get_ioprio(int pid, IoSchedClass clazz, int ioprio);

		#ifdef __cplusplus
		}
		#endif

		#endif /* __CUTILS_IOSCHED_POLICY_H */

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		/* libs/cutils/iosched_policy.c
		**
		** Copyright 2007, The Android Open Source Project
		**
		** Licensed under the Apache License, Version 2.0 (the "License");
		** you may not use this file except in compliance with the License.
		** You may obtain a copy of the License at
		**
		** http://www.apache.org/licenses/LICENSE-2.0
		**
		** Unless required by applicable law or agreed to in writing, software
		** distributed under the License is distributed on an "AS IS" BASIS,
		** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		** See the License for the specific language governing permissions and
		** limitations under the License.
		*/

		#include <stdio.h>
		#include <stdlib.h>
		#include <unistd.h>
		#include <string.h>
		#include <errno.h>
		#include <fcntl.h>
		#include <linux/unistd.h>

		#ifdef HAVE_SCHED_H

		#include <cutils/iosched_policy.h>

		extern int ioprio_set(int which, int who, int ioprio);

		enum {
		WHO_PROCESS = 1,
		WHO_PGRP,
		WHO_USER,
		};

		#define CLASS_SHIFT 13
		#define IOPRIO_NORM 4

		int android_set_ioprio(int pid, IoSchedClass clazz, int ioprio) {
		if (ioprio_set(WHO_PROCESS, pid, ioprio \| (clazz << CLASS_SHIFT))) {
		return -1;
		}
		return 0;
		}

		int android_get_ioprio(int pid, IoSchedClass clazz, int ioprio) {
		int rc;

		if ((rc = ioprio_get(WHO_PROCESS, pid)) < 0) {
		return -1;
		}

		*clazz = (rc >> CLASS_SHIFT);
		*ioprio = (rc & 0xff);
		return 0;
		}

		#endif /* HAVE_SCHED_H */

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		#include <stdio.h>
		#include <stdlib.h>
		#include <unistd.h>
		#include <errno.h>

		#include <cutils/iosched_policy.h>

		static char *classes[] = {"none", "rt", "be", "idle", NULL};

		int ionice_main(int argc, char *argv[])
		{
		IoSchedClass clazz = IoSchedClass_NONE;
		int ioprio = 0;
		int pid;

		if(argc != 2 && argc != 4) {
		fprintf(stderr, "usage: ionice <pid> [none\|rt\|be\|idle] [prio]\n");
		return 1;
		}

		if (!(pid = atoi(argv[1]))) {
		fprintf(stderr, "Invalid pid specified\n");
		return 1;
		}

		if (argc == 2) {
		if (android_get_ioprio(pid, &clazz, &ioprio)) {
		fprintf(stderr, "Failed to read priority (%s)\n", strerror(errno));
		return 1;
		}
		fprintf(stdout, "Pid %d, class %s (%d), prio %d\n", pid, classes[clazz], clazz, ioprio);
		return 0;
		}

		if (!strcmp(argv[2], "none")) {
		clazz = IoSchedClass_NONE;
		} else if (!strcmp(argv[2], "rt")) {
		clazz = IoSchedClass_RT;
		} else if (!strcmp(argv[2], "be")) {
		clazz = IoSchedClass_BE;
		} else if (!strcmp(argv[2], "idle")) {
		clazz = IoSchedClass_IDLE;
		} else {
		fprintf(stderr, "Unsupported class '%s'\n", argv[2]);
		return 1;
		}

		ioprio = atoi(argv[3]);

		printf("Setting pid %d i/o class to %d, prio %d\n", pid, clazz, ioprio);
		if (android_set_ioprio(pid, clazz, ioprio)) {
		fprintf(stderr, "Failed to set priority (%s)\n", strerror(errno));
		return 1;
		}

		return 0;
		}