new file mode 100644
@@ -0,0 +1,9 @@
+# cpuidle_stats execution:
+ - can compile and run separately.
+ - can run as part of cpuidle test : "sudo make -C cpuidle check"
+
+# info:
+- Need sudo permission to run.
+- saves trace in cpuidle/cpuidle_trace.log.
+- Gives complete and current sampling time(in/out and timespent) cpuidle
+state information.
@@ -56,5 +56,14 @@ fi
trap "restore_cpus; sigtrap" SIGHUP SIGINT SIGTERM
+check_cpuidle_trace() {
+ echo "### cpuidle state transition check:"
+ echo "## Collect the overall and current runtime cpuidle stats"
+ check "cpuidle stats execution" "./cpuidle_stats"
+ return 0
+}
+
for_each_cpu check_cpuidle_kill
restore_cpus
+
+check_cpuidle_trace
new file mode 100644
@@ -0,0 +1,443 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <sched.h>
+#include <linux/unistd.h>
+#include <signal.h>
+#include <time.h>
+
+#define path "./cpuidle_trace.log"
+
+unsigned int num_of_cpus;
+int signal_handled = 0;
+struct timeval start_time, stop_time;
+FILE *log_file;
+struct cpu_idle_stats {
+ int num_states, exit,active_state;
+ struct state_stats{
+ char name[25],desc[25],latency[25];
+ char power[25],time[25], usage[25];
+ int in;
+ double time_spent, entry_time;
+ } **state;
+ double exit_time;
+} **cpuidle_stats;
+
+double traceline_time_stamp(char *line)
+{
+ char *ptr;
+ char time_stamp[14];
+
+ ptr = strchr(line,'.');
+ if( ptr == NULL) {
+ printf("Funtion-%s : error, line format not recognized\n",__func__);
+ return -1; //todo - proper return value
+ }
+ strncpy(time_stamp,(ptr-6),13); //6 digits before and after decimal
+ time_stamp[14]=0; //set EOS
+
+ return atof(time_stamp);
+}
+
+void print_stat()
+{
+ int cpu,state;
+
+ fprintf(log_file,"=================== Current cpuidle statistics ================\n");
+
+ for(cpu=0 ; cpu<4 ; cpu++) {
+ fprintf(log_file,"cpu-%d : [State] [In-Count] [Time Spent]\n",cpu);
+ for(state=0 ; state<5 ; state++) {
+ fprintf(log_file,"\t[states-%d] in-count = %d time-spent = %lf\n",
+ state, cpuidle_stats[cpu]->state[state]->in,
+ cpuidle_stats[cpu]->state[state]->time_spent);
+ }
+ fprintf(log_file,"\t\t[Out-Count] = %d\n\n",cpuidle_stats[cpu]->exit);
+ }
+}
+
+/* function: scan the trace file
+ */
+int scan_trace_file(void)
+{
+ char line[1024],str[50];
+ FILE *fp;
+
+ printf("Scanning trace file ...\n");
+ fp = fopen (path, "r");
+ if (fp == NULL) {
+ printf("function-%s: error fopen\n",__func__);
+ return -1;
+ }
+
+ while( fgets(line, sizeof(line), fp) != NULL ) {
+ if(strstr(line,"cpu_idle")) {
+ int cpu_num;
+ for(cpu_num=0 ; cpu_num<4 ; cpu_num++) {
+ int ret;
+
+ sprintf(str,"cpu_id=%d",cpu_num);
+ if(strstr(line,str) == NULL)
+ continue;
+
+ for(ret=0 ; ret<cpuidle_stats[cpu_num]->num_states ; ret++) {
+ sprintf(str,"state=%d",ret);
+ if(strstr(line,"state=4294967295")) { //todo: do it better
+ cpuidle_stats[cpu_num]->exit_time =
+ traceline_time_stamp(line);
+ if(cpuidle_stats[cpu_num]->state[cpuidle_stats[cpu_num]->active_state]->entry_time)
+ cpuidle_stats[cpu_num]->state[cpuidle_stats[cpu_num]->active_state]->time_spent +=
+ cpuidle_stats[cpu_num]->exit_time -
+ cpuidle_stats[cpu_num]->state[cpuidle_stats[cpu_num]->active_state]->entry_time;
+
+ cpuidle_stats[cpu_num]->exit++;
+ break;
+ }
+ if(strstr(line,str) == NULL)
+ continue;
+
+ cpuidle_stats[cpu_num]->active_state = ret;
+ cpuidle_stats[cpu_num]->state[ret]->entry_time =
+ traceline_time_stamp(line);
+ cpuidle_stats[cpu_num]->state[ret]->in++;
+ }
+
+ }
+ }
+ }
+ print_stat();
+ printf("Logs saved in cpuidle_stats.log\n\n");
+}
+
+/* function: allocate and setup few structure for you
+ */
+void print_cpus_states_info(struct cpu_idle_stats **cpuidle_stats)
+{
+ int cpus, states;
+ char line_buf[1024],*ptr;
+
+ for(cpus=0 ; cpus<num_of_cpus ; cpus++)
+ {
+ memset(line_buf,'\0',sizeof(line_buf));
+ ptr=line_buf;
+ fprintf(log_file,"=========================================================\n");
+ fprintf(log_file,"\nCPU%d - Overall cpuidle state info: [STATE-0 ---> STATE-%d]\n"
+ ,cpus,(cpuidle_stats[cpus]->num_states-1));
+ for(states=0 ; states< cpuidle_stats[cpus]->num_states ; states++)
+ {
+ int str_len= strlen(cpuidle_stats[cpus]->state[states]->desc);
+ memcpy(ptr,cpuidle_stats[cpus]->state[states]->desc,str_len);
+ ptr += (str_len - 1);
+ *ptr++ = '/';
+ *ptr++ = '\t';
+ }
+ fprintf(log_file," desc[0->4] - %s\n",line_buf);
+
+ memset(line_buf,'\0',sizeof(line_buf));
+ ptr=line_buf;
+ for(states=0 ; states< cpuidle_stats[cpus]->num_states ; states++)
+ {
+ int str_len= strlen(cpuidle_stats[cpus]->state[states]->latency);
+ memcpy(ptr,cpuidle_stats[cpus]->state[states]->latency,str_len);
+ ptr += (str_len - 1);
+ *ptr++ = '\t';
+ }
+ fprintf(log_file," latency[0->4] - %s\n",line_buf);
+
+ memset(line_buf,'\0',sizeof(line_buf));
+ ptr=line_buf;
+ for(states=0 ; states< cpuidle_stats[cpus]->num_states ; states++)
+ {
+ int str_len= strlen(cpuidle_stats[cpus]->state[states]->name);
+ memcpy(ptr,cpuidle_stats[cpus]->state[states]->name,str_len);
+ ptr += (str_len - 1);
+ *ptr++ = '\t';
+ }
+ fprintf(log_file," name[0->4] - %s\n",line_buf);
+
+ memset(line_buf,'\0',sizeof(line_buf));
+ ptr=line_buf;
+ for(states=0 ; states< cpuidle_stats[cpus]->num_states ; states++)
+ {
+ int str_len= strlen(cpuidle_stats[cpus]->state[states]->power);
+ memcpy(ptr,cpuidle_stats[cpus]->state[states]->power,str_len);
+ ptr += (str_len - 1);
+ *ptr++ = '\t';
+ }
+ fprintf(log_file," power[0->4] - %s\n",line_buf);
+
+ memset(line_buf,'\0',sizeof(line_buf));
+ ptr=line_buf;
+ for(states=0 ; states< cpuidle_stats[cpus]->num_states ; states++)
+ {
+ int str_len= strlen(cpuidle_stats[cpus]->state[states]->time);
+ memcpy(ptr,cpuidle_stats[cpus]->state[states]->time,str_len);
+ ptr += (str_len - 1);
+ *ptr++ = '\t';
+ }
+ fprintf(log_file," time[0->4] - %s\n",line_buf);
+
+ memset(line_buf,'\0',sizeof(line_buf));
+ ptr=line_buf;
+ for(states=0 ; states< cpuidle_stats[cpus]->num_states ; states++)
+ {
+ int str_len= strlen(cpuidle_stats[cpus]->state[states]->usage);
+ memcpy(ptr,cpuidle_stats[cpus]->state[states]->usage,str_len);
+ ptr += (str_len - 1);
+ *ptr++ = '\t';
+ }
+ fprintf(log_file," usage[0->4] - %s\n",line_buf);
+ }
+ fprintf(log_file,"=========================================================\n");
+}
+
+/* function: read sys attribute in char buffer
+ */
+int read_attribute(char *state_path, char *buf)
+{
+ int fd, ret;
+
+ fd = open(state_path, O_RDONLY, 0666);
+ if(fd < 0) {
+ ret = fd;
+ goto fail;
+ }
+ ret = read(fd, buf, 255);
+ if(ret < 0) {
+ close(fd);
+ goto fail;
+ }
+ close(fd);
+ return 0;
+fail:
+ printf("function-%s: error/fail\n",__func__);
+ return ret;
+}
+
+/* Function: Read the cpu-state attributes from sysfs
+ */
+int read_state_stats(struct state_stats *state, char *state_path)
+{
+ char state_attr_path[256];
+ int ret;
+
+ snprintf(state_attr_path, sizeof(state_attr_path),"%s/%s",
+ state_path,"desc");
+ ret = read_attribute(state_attr_path,state->desc);
+ if(ret < 0)
+ goto fail;
+
+ snprintf(state_attr_path, sizeof(state_attr_path),"%s/%s",
+ state_path,"latency");
+ ret = read_attribute(state_attr_path,state->latency);
+ if(ret < 0)
+ goto fail;
+
+ snprintf(state_attr_path, sizeof(state_attr_path),"%s/%s",
+ state_path,"name");
+ ret = read_attribute(state_attr_path,state->name);
+ if(ret < 0)
+ goto fail;
+
+ snprintf(state_attr_path, sizeof(state_attr_path),"%s/%s",
+ state_path,"power");
+ ret = read_attribute(state_attr_path,state->power);
+ if(ret < 0)
+ goto fail;
+
+ snprintf(state_attr_path, sizeof(state_attr_path),"%s/%s",
+ state_path,"time");
+ ret = read_attribute(state_attr_path,state->time);
+ if(ret < 0)
+ goto fail;
+
+ snprintf(state_attr_path, sizeof(state_attr_path),"%s/%s",
+ state_path,"usage");
+ ret = read_attribute(state_attr_path,state->usage);
+ if(ret < 0)
+ goto fail;
+
+ return 0;
+fail:
+ printf("Function-%s: error\n",__func__);
+ return ret;
+}
+
+/* function: print complete stats present in sysfs from epoch time
+ */
+int get_states_info(struct cpu_idle_stats **cpuidle_stats, int num_of_cpus)
+{
+ char cpu_path[256],state_path[256];
+ int cpu,state,ret;
+ FILE *file;
+
+ for(cpu=0 ; cpu<num_of_cpus ; cpu++) {
+ snprintf(cpu_path, sizeof(state_path),
+ "/sys/devices/system/cpu/cpu%d/cpuidle",cpu);
+ for(state=0 ; state<256 ; state++){
+ snprintf(state_path, sizeof(state_path),"%s/state%d",
+ cpu_path,state);
+ file = fopen(state_path,"r");
+ if(file != NULL) {
+ fclose(file);
+ }
+ else {
+ fprintf(log_file,"cpu-%d total states = %d\n",cpu,state);
+ cpuidle_stats[cpu]->num_states = state;
+ break;
+ }
+ }
+
+ cpuidle_stats[cpu]->state =
+ malloc(cpuidle_stats[cpu]->num_states * sizeof(int *));
+ for(state=0 ; state<cpuidle_stats[cpu]->num_states ; state++) {
+ cpuidle_stats[cpu]->state[state] =
+ malloc(sizeof(struct state_stats));
+ memset(cpuidle_stats[cpu]->state[state],'\0',
+ sizeof(struct state_stats));
+ snprintf(state_path, sizeof(state_path),"%s/state%d",
+ cpu_path,state);
+ ret = read_state_stats(cpuidle_stats[cpu]->state[state],
+ state_path);
+ }
+ }
+ print_cpus_states_info(cpuidle_stats);
+}
+
+/* function: checks cpu and state information and allocate structure accordingly
+ */
+int setup_cpuidle_info()
+{
+ int ret,retb;
+
+ num_of_cpus = sysconf(_SC_NPROCESSORS_CONF);
+ fprintf(log_file,"number of cpus = %d\n",num_of_cpus);
+
+ cpuidle_stats = malloc(num_of_cpus * sizeof(int *));
+ for( ret=0 ; ret<num_of_cpus ; ret++) {
+ int i;
+
+ cpuidle_stats[ret] = (struct cpu_idle_stats*)
+ malloc(sizeof(struct cpu_idle_stats));
+ if(!cpuidle_stats[ret]) {
+ printf("functioin:%s memory allocation failure\n",__func__);
+ }
+ memset(cpuidle_stats[ret],0,sizeof(struct cpu_idle_stats));
+ }
+ ret = get_states_info(cpuidle_stats, num_of_cpus);
+ if(ret < 0) {
+ printf("function:%s: error\n",__func__);
+ }
+
+ return ret;
+}
+
+/* function: Handler to stop tracing
+ */
+void handle_tracing_stop(int signum)
+{
+ char buf[256];
+ int ret;
+ double duration;
+
+ snprintf(buf,sizeof(buf),
+ "echo 0 > /sys/kernel/debug/tracing/events/power/cpu_idle/enable");
+ ret = system(buf);
+ if(ret != 0)
+ goto fail;
+
+ snprintf(buf,sizeof(buf),
+ "cat /sys/kernel/debug/tracing/trace > ./cpuidle_trace.log");
+ ret = system(buf);
+ if(ret != 0)
+ goto fail;
+
+ printf("\nCapturing cpu_idle trace : end, saved in file:"
+ "cpuidle_trace.log\n");
+ signal_handled = 1;
+ return;
+fail:
+ printf("san-%s: fail/error\n",__func__);
+}
+
+/* function: Generate cpuidle trace and save in file
+ */
+int capture_trace()
+{
+ char buf[256];
+ char p[]="adkfh";
+ int ret;
+
+ printf("\n\nCapturing cpu_idle trace : start\n");
+ signal(SIGINT, handle_tracing_stop);
+
+ /* prepare */
+ snprintf(buf,sizeof(buf),
+ "echo 0 > /sys/kernel/debug/tracing/events/power/cpu_idle/enable");
+ ret = system(buf);
+ if(ret != 0)
+ goto fail;
+ snprintf(buf,sizeof(buf),"echo > /sys/kernel/debug/tracing/trace");
+ ret = system(buf);
+ if(ret != 0)
+ goto fail;
+ /* enable tracing */
+ snprintf(buf,sizeof(buf),
+ "echo nop > /sys/kernel/debug/tracing/current_tracer");
+ ret = system(buf);
+ if(ret != 0)
+ goto fail;
+ snprintf(buf,sizeof(buf),
+ "echo 1 > /sys/kernel/debug/tracing/tracing_enabled");
+ ret = system(buf);
+ if(ret != 0)
+ goto fail;
+ snprintf(buf,sizeof(buf),"echo 1 > /sys/kernel/debug/tracing/tracing_on");
+ ret = system(buf);
+ if(ret != 0)
+ goto fail;
+
+ gettimeofday(&start_time,NULL);
+ snprintf(buf,sizeof(buf),
+ "echo 1 > /sys/kernel/debug/tracing/events/power/cpu_idle/enable");
+ ret = system(buf);
+ if(ret != 0)
+ goto fail;
+
+ printf("\nPress Ctrl + c to Exit\n");
+ while(!signal_handled)
+ sleep(1);
+
+ return 0;
+fail:
+ printf("%s: fail/error\n",__func__);
+ return ret;
+}
+
+int main()
+{
+ int ret;
+
+ log_file = fopen("cpuidle_stats.log","w");
+ if(log_file == NULL) {
+ printf("error: can't create log file\n");
+ return -1;
+ }
+
+ ret = setup_cpuidle_info();
+ if(ret < 0) {
+ printf("function: %s: error\n",__func__);
+ }
+
+ ret = capture_trace();
+ if(ret != 0)
+ return ret;
+
+ scan_trace_file();
+
+ return 0;
+}
Add functionality to record the overall and current runtime cpuidle statistics. Signed-off-by: Sanjay Singh Rawat <sanjay.rawat@linaro.com> --- cpuidle/Readme.txt | 9 + cpuidle/cpuidle_03.sh | 9 + cpuidle/cpuidle_stats.c | 443 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 461 insertions(+) create mode 100644 cpuidle/Readme.txt create mode 100644 cpuidle/cpuidle_stats.c