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12
android/system/extras/sane_schedstat/Android.mk Normal file
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LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES := sane_schedstat.c
LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES)
LOCAL_MODULE_TAGS := debug
LOCAL_MODULE := sane_schedstat
LOCAL_CFLAGS := -Wno-unused-parameter
include $(BUILD_EXECUTABLE)

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android/system/extras/sane_schedstat/NOTICE Normal file
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Copyright (c) 2010, 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.
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
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Apache License
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http://www.apache.org/licenses/
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157
android/system/extras/sane_schedstat/sane_schedstat.c Normal file
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/*
** Copyright 2010 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.
*/
/* Opens /proc/sched_stat and diff's the counters.
Currently support version 15, modify parse() to support other
versions
*/
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <sys/uio.h>
#include <unistd.h>
#include <sys/time.h>
#include <fcntl.h>
#define MAX_CPU 2
struct cpu_stat {
/* sched_yield() stats */
unsigned int yld_count; /* sched_yield() called */
/* schedule() stats */
unsigned int sched_switch; /* switched to expired queue and reused it */
unsigned int sched_count; /* schedule() called */
unsigned int sched_goidle; /* schedule() left the cpu idle */
/* try_to_wake_up() stats */
unsigned int ttwu_count; /* try_to_wake_up() called */
/* try_to_wake_up() called and found the process being awakened last ran on
* the waking cpu */
unsigned int ttwu_local;
/* latency stats */
unsigned long long cpu_time; /* time spent running by tasks (ms) */
unsigned long long run_delay; /* time spent waiting to run by tasks (ms) */
unsigned long pcount; /* number of tasks (not necessarily unique) given */
};
struct cpu_stat cpu_prev[MAX_CPU];
struct cpu_stat cpu_delta[MAX_CPU];
struct cpu_stat tmp;
static const char *next_line(const char *b) {
while (1) {
switch (*b) {
case '\n':
return b + 1;
case '\0':
return NULL;
}
b++;
}
}
static int print() {
int i;
printf("CPU yield() schedule() switch idle ttwu() local cpu_time wait_time timeslices\n");
for (i=0; i<MAX_CPU; i++) {
printf(" %2d %7u %10u %6u %4u %8u %5u %9llu %9llu %10lu\n",
i,
cpu_delta[i].yld_count,
cpu_delta[i].sched_count, cpu_delta[i].sched_switch, cpu_delta[i].sched_goidle,
cpu_delta[i].ttwu_count, cpu_delta[i].ttwu_local,
cpu_delta[i].cpu_time / 1000000, cpu_delta[i].run_delay / 1000000, cpu_delta[i].pcount);
}
return 0;
}
static int parse_cpu_v15(const char *b) {
int cpu;
if (sscanf(b, "cpu%d %u %u %u %u %u %u %llu %llu %lu\n",
&cpu, &tmp.yld_count,
&tmp.sched_switch, &tmp.sched_count, &tmp.sched_goidle,
&tmp.ttwu_count, &tmp.ttwu_local,
&tmp.cpu_time, &tmp.run_delay, &tmp.pcount) != 10) {
printf("Could not parse %s\n", b);
return -1;
}
cpu_delta[cpu].yld_count = tmp.yld_count - cpu_prev[cpu].yld_count;
cpu_delta[cpu].sched_switch = tmp.sched_switch - cpu_prev[cpu].sched_switch;
cpu_delta[cpu].sched_count = tmp.sched_count - cpu_prev[cpu].sched_count;
cpu_delta[cpu].sched_goidle = tmp.sched_goidle - cpu_prev[cpu].sched_goidle;
cpu_delta[cpu].ttwu_count = tmp.ttwu_count - cpu_prev[cpu].ttwu_count;
cpu_delta[cpu].ttwu_local = tmp.ttwu_local - cpu_prev[cpu].ttwu_local;
cpu_delta[cpu].cpu_time = tmp.cpu_time - cpu_prev[cpu].cpu_time;
cpu_delta[cpu].run_delay = tmp.run_delay - cpu_prev[cpu].run_delay;
cpu_delta[cpu].pcount = tmp.pcount - cpu_prev[cpu].pcount;
cpu_prev[cpu] = tmp;
return 0;
}
static int parse(const char *b) {
unsigned int version;
unsigned long long ts;
if (sscanf(b, "version %u\n", &version) != 1) {
printf("Could not parse version\n");
return -1;
}
switch (version) {
case 15:
b = next_line(b);
if (!b || sscanf(b, "timestamp %llu\n", &ts) != 1) {
printf("Could not parse timestamp\n");
return -1;
}
while (1) {
b = next_line(b);
if (!b) break;
if (b[0] == 'c') {
if (parse_cpu_v15(b)) return -1;
}
}
break;
default:
printf("Can not handle version %u\n", version);
return -1;
}
return 0;
}
int main(int argc, char **argv) {
int i;
int fd;
char buf[4096];
while (1) {
fd = open("/proc/schedstat", O_RDONLY);
if (fd < 0) return -1;
i = read(fd, buf, sizeof(buf) - 1);
close(fd);
buf[i] = '\0';
if (parse(buf)) return -1;
print();
sleep(1);
}
return 0;
}