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turbostat: Add a helper to parse a single int out of a file 

Many different chunks of code in turbostat open a file, parse a single
int out of it, and close it.  Factor that out into a common function.

Signed-off-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Josh Triplett 2013-08-20 17:20:16 -07:00 committed by Len Brown
parent 7482341976
commit 95aebc44e7
1 changed files with 31 additions and 64 deletions
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95
tools/power/x86/turbostat/turbostat.c
View File

@ -21,6 +21,7 @@
#define _GNU_SOURCE
#include MSRHEADER
#include <stdarg.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
@ -1173,28 +1174,39 @@ void free_all_buffers(void)
outp = NULL;
}
/*
* Parse a file containing a single int.
*/
int parse_int_file(const char *fmt, ...)
{
va_list args;
char path[PATH_MAX];
FILE *filep;
int value;
va_start(args, fmt);
vsnprintf(path, sizeof(path), fmt, args);
va_end(args);
filep = fopen(path, "r");
if (!filep) {
perror(path);
exit(1);
}
if (fscanf(filep, "%d", &value) != 1) {
perror(path);
exit(1);
}
fclose(filep);
return value;
}
/*
* cpu_is_first_sibling_in_core(cpu)
* return 1 if given CPU is 1st HT sibling in the core
*/
int cpu_is_first_sibling_in_core(int cpu)
{
char path[64];
FILE *filep;
int first_cpu;
sprintf(path, "/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list", cpu);
filep = fopen(path, "r");
if (filep == NULL) {
perror(path);
exit(1);
}
if (fscanf(filep, "%d", &first_cpu) != 1) {
perror(path);
exit(1);
}
fclose(filep);
return (cpu == first_cpu);
return cpu == parse_int_file("/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list", cpu);
}
/*
@ -1203,62 +1215,17 @@ int cpu_is_first_sibling_in_core(int cpu)
*/
int cpu_is_first_core_in_package(int cpu)
{
char path[64];
FILE *filep;
int first_cpu;
sprintf(path, "/sys/devices/system/cpu/cpu%d/topology/core_siblings_list", cpu);
filep = fopen(path, "r");
if (filep == NULL) {
perror(path);
exit(1);
}
if (fscanf(filep, "%d", &first_cpu) != 1) {
perror(path);
exit(1);
}
fclose(filep);
return (cpu == first_cpu);
return cpu == parse_int_file("/sys/devices/system/cpu/cpu%d/topology/core_siblings_list", cpu);
}
int get_physical_package_id(int cpu)
{
char path[80];
FILE *filep;
int pkg;
sprintf(path, "/sys/devices/system/cpu/cpu%d/topology/physical_package_id", cpu);
filep = fopen(path, "r");
if (filep == NULL) {
perror(path);
exit(1);
}
if (fscanf(filep, "%d", &pkg) != 1) {
perror(path);
exit(1);
}
fclose(filep);
return pkg;
return parse_int_file("/sys/devices/system/cpu/cpu%d/topology/physical_package_id", cpu);
}
int get_core_id(int cpu)
{
char path[80];
FILE *filep;
int core;
sprintf(path, "/sys/devices/system/cpu/cpu%d/topology/core_id", cpu);
filep = fopen(path, "r");
if (filep == NULL) {
perror(path);
exit(1);
}
if (fscanf(filep, "%d", &core) != 1) {
perror(path);
exit(1);
}
fclose(filep);
return core;
return parse_int_file("/sys/devices/system/cpu/cpu%d/topology/core_id", cpu);
}
int get_num_ht_siblings(int cpu)