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authorLen Brown <len.brown@intel.com>2012-11-08 22:38:05 -0500
committerLen Brown <len.brown@intel.com>2012-11-27 00:03:06 -0500
commite52966c084f9d9ea12be2ac7df801d610d4a19a5 (patch)
tree4ea59e63067349ce8671cdcf7fe06a62c0b1933b /tools/power
parent3fc808aaa052dec7b155f3242c6c0eabf0c49127 (diff)
downloadvexpress-lsk-e52966c084f9d9ea12be2ac7df801d610d4a19a5.tar.gz
tools/power turbostat: prevent infinite loop on migration error path
Turbostat assumed if it can't migrate to a CPU, then the CPU must have gone off-line and turbostat should re-initialize with the new topology. But if turbostat can not migrate because it is restricted by a cpuset, then it will fail to migrate even after re-initialization, resulting in an infinite loop. Spit out a warning when we can't migrate and endure only 2 re-initialize cycles in a row before giving up and exiting. Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'tools/power')
-rw-r--r--tools/power/x86/turbostat/turbostat.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 3c063a00f3b..77e76b11382 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -656,8 +656,10 @@ int get_counters(struct thread_data *t, struct core_data *c, struct pkg_data *p)
{
int cpu = t->cpu_id;
- if (cpu_migrate(cpu))
+ if (cpu_migrate(cpu)) {
+ fprintf(stderr, "Could not migrate to CPU %d\n", cpu);
return -1;
+ }
t->tsc = rdtsc(); /* we are running on local CPU of interest */
@@ -1088,15 +1090,22 @@ int mark_cpu_present(int cpu)
void turbostat_loop()
{
int retval;
+ int restarted = 0;
restart:
+ restarted++;
+
retval = for_all_cpus(get_counters, EVEN_COUNTERS);
if (retval < -1) {
exit(retval);
} else if (retval == -1) {
+ if (restarted > 1) {
+ exit(retval);
+ }
re_initialize();
goto restart;
}
+ restarted = 0;
gettimeofday(&tv_even, (struct timezone *)NULL);
while (1) {