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tools/power turbostat: stop migrating, unless '-m' 

Turbostat has the capability to set its own affinity to
each CPU so that its MSR accesses are on the local CPU.

However, using the in-kernel cross-call in  the msr driver
tends to be less invasive, so do that -- by-default.
'-m' remains to get the old behaviour.

Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Len Brown 2017-05-27 21:18:12 -07:00
parent f4fdf2b474
commit c91fc8519d
1 changed files with 9 additions and 1 deletions
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10
tools/power/x86/turbostat/turbostat.c
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@ -92,6 +92,7 @@ unsigned int do_ring_perf_limit_reasons;
unsigned int crystal_hz;
unsigned long long tsc_hz;
int base_cpu;
int do_migrate;
double discover_bclk(unsigned int family, unsigned int model);
unsigned int has_hwp; /* IA32_PM_ENABLE, IA32_HWP_CAPABILITIES */
/* IA32_HWP_REQUEST, IA32_HWP_STATUS */
@ -302,6 +303,9 @@ int for_all_cpus(int (func)(struct thread_data *, struct core_data *, struct pkg
int cpu_migrate(int cpu)
{
if (!do_migrate)
return 0;
CPU_ZERO_S(cpu_affinity_setsize, cpu_affinity_set);
CPU_SET_S(cpu, cpu_affinity_setsize, cpu_affinity_set);
if (sched_setaffinity(0, cpu_affinity_setsize, cpu_affinity_set) == -1)
@ -5000,6 +5004,7 @@ void cmdline(int argc, char **argv)
{"hide", required_argument, 0, 'H'}, // meh, -h taken by --help
{"Joules", no_argument, 0, 'J'},
{"list", no_argument, 0, 'l'},
{"migrate", no_argument, 0, 'm'},
{"out", required_argument, 0, 'o'},
{"quiet", no_argument, 0, 'q'},
{"show", required_argument, 0, 's'},
@ -5011,7 +5016,7 @@ void cmdline(int argc, char **argv)
progname = argv[0];
while ((opt = getopt_long_only(argc, argv, "+C:c:Ddhi:JM:m:o:qST:v",
while ((opt = getopt_long_only(argc, argv, "+C:c:Ddhi:Jmo:qST:v",
long_options, &option_index)) != -1) {
switch (opt) {
case 'a':
@ -5054,6 +5059,9 @@ void cmdline(int argc, char **argv)
list_header_only++;
quiet++;
break;
case 'm':
do_migrate = 1;
break;
case 'o':
outf = fopen_or_die(optarg, "w");
break;