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linux-cpupower-6.4-rc3

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This cpupower fixes update for Linux 67.4-rc3 consists of:
 
 - a resource leak fix
 - fix drift in C0 percentage calculation due to System-wide TSC read.
   To lower this drift read TSC per CPU and also just after mperf read.
   This technique improves C0 percentage calculation in Mperf monitor
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Merge tag 'linux-cpupower-6.4-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux

Pull cpupower utility fixes for 6.4-rc3 from Shuah Khan:

"This cpupower fixes update for Linux 67.4-rc3 consists of:

- a resource leak fix
- fix drift in C0 percentage calculation due to System-wide TSC read.
  To lower this drift read TSC per CPU and also just after mperf read.
  This technique improves C0 percentage calculation in Mperf monitor"

* tag 'linux-cpupower-6.4-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux:
  cpupower: Make TSC read per CPU for Mperf monitor
  cpupower:Fix resource leaks in sysfs_get_enabled()
This commit is contained in:
Rafael J. Wysocki 2023-05-19 16:23:07 +02:00
parent f1fcbaa18b c2adb1877b
commit eab866bfff
2 changed files with 30 additions and 24 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

23
tools/power/cpupower/lib/powercap.c
View file

@ -40,25 +40,34 @@ static int sysfs_get_enabled(char *path, int *mode)
{
int fd;
char yes_no;
int ret = 0;
*mode = 0;
fd = open(path, O_RDONLY);
if (fd == -1)
return -1;
if (fd == -1) {
ret = -1;
goto out;
}
if (read(fd, &yes_no, 1) != 1) {
close(fd);
return -1;
ret = -1;
goto out_close;
}
if (yes_no == '1') {
*mode = 1;
return 0;
goto out_close;
} else if (yes_no == '0') {
return 0;
goto out_close;
} else {
ret = -1;
goto out_close;
}
return -1;
out_close:
close(fd);
out:
return ret;
}
int powercap_get_enabled(int *mode)

31
tools/power/cpupower/utils/idle_monitor/mperf_monitor.c
View file

@ -70,8 +70,8 @@ static int max_freq_mode;
*/
static unsigned long max_frequency;
static unsigned long long tsc_at_measure_start;
static unsigned long long tsc_at_measure_end;
static unsigned long long *tsc_at_measure_start;
static unsigned long long *tsc_at_measure_end;
static unsigned long long *mperf_previous_count;
static unsigned long long *aperf_previous_count;
static unsigned long long *mperf_current_count;
@ -169,7 +169,7 @@ static int mperf_get_count_percent(unsigned int id, double *percent,
aperf_diff = aperf_current_count[cpu] - aperf_previous_count[cpu];
if (max_freq_mode == MAX_FREQ_TSC_REF) {
tsc_diff = tsc_at_measure_end - tsc_at_measure_start;
tsc_diff = tsc_at_measure_end[cpu] - tsc_at_measure_start[cpu];
*percent = 100.0 * mperf_diff / tsc_diff;
dprint("%s: TSC Ref - mperf_diff: %llu, tsc_diff: %llu\n",
mperf_cstates[id].name, mperf_diff, tsc_diff);
@ -206,7 +206,7 @@ static int mperf_get_count_freq(unsigned int id, unsigned long long *count,
if (max_freq_mode == MAX_FREQ_TSC_REF) {
/* Calculate max_freq from TSC count */
tsc_diff = tsc_at_measure_end - tsc_at_measure_start;
tsc_diff = tsc_at_measure_end[cpu] - tsc_at_measure_start[cpu];
time_diff = timespec_diff_us(time_start, time_end);
max_frequency = tsc_diff / time_diff;
}
@ -225,33 +225,27 @@ static int mperf_get_count_freq(unsigned int id, unsigned long long *count,
static int mperf_start(void)
{
int cpu;
unsigned long long dbg;
clock_gettime(CLOCK_REALTIME, &time_start);
mperf_get_tsc(&tsc_at_measure_start);
for (cpu = 0; cpu < cpu_count; cpu++)
for (cpu = 0; cpu < cpu_count; cpu++) {
mperf_get_tsc(&tsc_at_measure_start[cpu]);
mperf_init_stats(cpu);
}
mperf_get_tsc(&dbg);
dprint("TSC diff: %llu\n", dbg - tsc_at_measure_start);
return 0;
}
static int mperf_stop(void)
{
unsigned long long dbg;
int cpu;
for (cpu = 0; cpu < cpu_count; cpu++)
for (cpu = 0; cpu < cpu_count; cpu++) {
mperf_measure_stats(cpu);
mperf_get_tsc(&tsc_at_measure_end[cpu]);
}
mperf_get_tsc(&tsc_at_measure_end);
clock_gettime(CLOCK_REALTIME, &time_end);
mperf_get_tsc(&dbg);
dprint("TSC diff: %llu\n", dbg - tsc_at_measure_end);
return 0;
}
@ -353,7 +347,8 @@ struct cpuidle_monitor *mperf_register(void)
aperf_previous_count = calloc(cpu_count, sizeof(unsigned long long));
mperf_current_count = calloc(cpu_count, sizeof(unsigned long long));
aperf_current_count = calloc(cpu_count, sizeof(unsigned long long));
tsc_at_measure_start = calloc(cpu_count, sizeof(unsigned long long));
tsc_at_measure_end = calloc(cpu_count, sizeof(unsigned long long));
mperf_monitor.name_len = strlen(mperf_monitor.name);
return &mperf_monitor;
}
@ -364,6 +359,8 @@ void mperf_unregister(void)
free(aperf_previous_count);
free(mperf_current_count);
free(aperf_current_count);
free(tsc_at_measure_start);
free(tsc_at_measure_end);
free(is_valid);
}