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tools/power turbostat: if --debug, print sampling overhead

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The --debug option now pre-pends each row with
the number  of micro-seconds [usec] to collect
the finishing snapshot for that row.

Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Len Brown 2017-05-27 21:06:55 -07:00
parent a99d87306f
commit f4fdf2b474
1 changed files with 19 additions and 2 deletions
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21
tools/power/x86/turbostat/turbostat.c
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@ -150,6 +150,8 @@ size_t cpu_present_setsize, cpu_affinity_setsize, cpu_subset_size;
#define MAX_ADDED_COUNTERS 16
struct thread_data {
struct timeval tv_begin;
struct timeval tv_end;
unsigned long long tsc;
unsigned long long aperf;
unsigned long long mperf;
@ -530,6 +532,8 @@ void print_header(char *delim)
struct msr_counter *mp;
int printed = 0;
if (debug)
outp += sprintf(outp, "usec %s", delim);
if (DO_BIC(BIC_Package))
outp += sprintf(outp, "%sPackage", (printed++ ? delim : ""));
if (DO_BIC(BIC_Core))
@ -782,6 +786,14 @@ int format_counters(struct thread_data *t, struct core_data *c,
(cpu_subset && !CPU_ISSET_S(t->cpu_id, cpu_subset_size, cpu_subset)))
return 0;
if (debug) {
/* on each row, print how many usec each timestamp took to gather */
struct timeval tv;
timersub(&t->tv_end, &t->tv_begin, &tv);
outp += sprintf(outp, "%5ld\t", tv.tv_sec * 1000000 + tv.tv_usec);
}
interval_float = tv_delta.tv_sec + tv_delta.tv_usec/1000000.0;
tsc = t->tsc * tsc_tweak;
@ -1503,6 +1515,9 @@ int get_counters(struct thread_data *t, struct core_data *c, struct pkg_data *p)
struct msr_counter *mp;
int i;
gettimeofday(&t->tv_begin, (struct timezone *)NULL);
if (cpu_migrate(cpu)) {
fprintf(outf, "Could not migrate to CPU %d\n", cpu);
return -1;
@ -1586,7 +1601,7 @@ retry:
/* collect core counters only for 1st thread in core */
if (!(t->flags & CPU_IS_FIRST_THREAD_IN_CORE))
return 0;
goto done;
if (DO_BIC(BIC_CPU_c3) && !do_slm_cstates && !do_knl_cstates) {
if (get_msr(cpu, MSR_CORE_C3_RESIDENCY, &c->c3))
@ -1622,7 +1637,7 @@ retry:
/* collect package counters only for 1st core in package */
if (!(t->flags & CPU_IS_FIRST_CORE_IN_PACKAGE))
return 0;
goto done;
if (DO_BIC(BIC_Totl_c0)) {
if (get_msr(cpu, MSR_PKG_WEIGHTED_CORE_C0_RES, &p->pkg_wtd_core_c0))
@ -1715,6 +1730,8 @@ retry:
if (get_mp(cpu, mp, &p->counter[i]))
return -10;
}
done:
gettimeofday(&t->tv_end, (struct timezone *)NULL);
return 0;
}