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Commit c91fc851 authored by Len Brown's avatar Len Brown
Browse files

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: default avatarLen Brown <len.brown@intel.com>
parent f4fdf2b4

tools/power/x86/turbostat/turbostat.c

+9 −1
Original line number Diff line number Diff line
@@ -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;