Turbostat: Refactor migrate CPU before get_MSR

In two out of three "get_msr" calls, there is a CPU migration, which
does not seem to be used by something else (in one case, it was used by
the rdtsc call).
Move the migrate call directly into the open_msr function

diff --git a/src/turbostat.c b/src/turbostat.c
index c777860..d602ffe 100644 (file)
--- a/src/turbostat.c
+++ b/src/turbostat.c
@@ -271,6 +271,12 @@ open_msr(int cpu)
 {
        char pathname[32];
 
+       /* FIXME: Do we really need this, why? */
+       if (cpu_migrate(cpu)) {
+               ERROR("Could not migrate to CPU %d\n", cpu);
+               return -ERR_CPU_MIGRATE;
+       }
+
        ssnprintf(pathname, 32, "/dev/cpu/%d/msr", cpu);
        return open(pathname, O_RDONLY);
 }
@@ -438,11 +444,6 @@ get_counters(struct thread_data *t, struct core_data *c, struct pkg_data *p)
        int msr_fd;
        int retval = 0;
 
-       if (cpu_migrate(cpu)) {
-               WARNING("Could not migrate to CPU %d\n", cpu);
-               return -ERR_CPU_MIGRATE;
-       }
-
        msr_fd = open_msr(cpu);
        if (msr_fd < 0)
                return -ERR_CANT_OPEN_MSR;
@@ -968,7 +969,6 @@ set_temperature_target(struct thread_data *t, struct core_data *c, struct pkg_da
 {
        unsigned long long msr;
        unsigned int target_c_local;
-       int cpu;
 
        /* tcc_activation_temp is used only for dts or ptm */
        if (!(do_dts || do_ptm))
@@ -978,12 +978,6 @@ set_temperature_target(struct thread_data *t, struct core_data *c, struct pkg_da
        if (!(t->flags & CPU_IS_FIRST_THREAD_IN_CORE) || !(t->flags & CPU_IS_FIRST_CORE_IN_PACKAGE))
                return 0;
 
-       cpu = t->cpu_id;
-       if (cpu_migrate(cpu)) {
-               ERROR("Could not migrate to CPU %d\n", cpu);
-               return -ERR_CPU_MIGRATE;
-       }
-
        if (tcc_activation_temp_override != 0) {
                tcc_activation_temp = tcc_activation_temp_override;
                ERROR("cpu%d: Using cmdline TCC Target (%d C)\n",
@@ -991,7 +985,7 @@ set_temperature_target(struct thread_data *t, struct core_data *c, struct pkg_da
                return 0;
        }
 
-       if (get_msr(cpu, MSR_IA32_TEMPERATURE_TARGET, &msr))
+       if (get_msr(t->cpu_id, MSR_IA32_TEMPERATURE_TARGET, &msr))
                goto guess;
 
        target_c_local = (msr >> 16) & 0x7F;
@@ -1006,7 +1000,7 @@ set_temperature_target(struct thread_data *t, struct core_data *c, struct pkg_da
 guess:
        tcc_activation_temp = TJMAX_DEFAULT;
        WARNING("cpu%d: Guessing tjMax %d C, Please use -T to specify\n",
-               cpu, tcc_activation_temp);
+               t->cpu_id, tcc_activation_temp);
 
        return 0;
 }