doug@s15:~/temp-k-git-3.10rc4/linux/drivers/cpufreq$ diff -u intel_pstate.c.315rc5.dirk3 intel_pstate.c.315rc5.dirk4
--- intel_pstate.c.315rc5.dirk3 2014-05-22 08:09:49.307336907 -0700
+++ intel_pstate.c.315rc5.dirk4 2014-05-24 14:56:35.670640514 -0700
@@ -98,6 +98,7 @@
        struct vid_data vid;
        struct _pid pid;

+       int     active_flag;
        ktime_t last_sample_time;
        u64     prev_aperf;
        u64     prev_mperf;
@@ -627,7 +628,7 @@
        if (duration_us > sample_time * 10) {
                sample_ratio = div_fp(int_tofp(sample_time),
                                int_tofp(duration_us));
-               core_busy = mul_fp(core_busy, sample_ratio);
+//             core_busy = mul_fp(core_busy, sample_ratio);
        }

        return core_busy;
@@ -658,23 +659,34 @@
        struct cpudata *cpu = (struct cpudata *) __data;
        struct sample *sample;

-       u32 pstate_save = cpu->pstate.current_pstate;
+       u32 pstate_save;

-       intel_pstate_sample(cpu);

-       sample = &cpu->sample;
+       if( cpu->active_flag != 0){ // check for overrun
+               pr_info("Intel pstate: Catastrophic Error: Overrun: cpu %d\n", cpu->cpu);
+       } else {
+               cpu->active_flag = 1;
+
+               pstate_save = cpu->pstate.current_pstate;
+
+               intel_pstate_sample(cpu);

-       intel_pstate_adjust_busy_pstate(cpu);
+               sample = &cpu->sample;

-       trace_pstate_sample(fp_toint(sample->core_pct_busy),
-                       fp_toint(intel_pstate_get_scaled_busy(cpu)),
-                       pstate_save,
-                       cpu->pstate.current_pstate,
-                       sample->mperf,
-                       sample->aperf,
-                       sample->freq);
+               intel_pstate_adjust_busy_pstate(cpu);

-       intel_pstate_set_sample_time(cpu);
+               trace_pstate_sample(fp_toint(sample->core_pct_busy),
+                               fp_toint(intel_pstate_get_scaled_busy(cpu)),
+                               pstate_save,
+                               cpu->pstate.current_pstate,
+                               sample->mperf,
+                               sample->aperf,
+                               sample->freq);
+
+               intel_pstate_set_sample_time(cpu);
+
+               cpu->active_flag = 0;
+       } /* endif */
 }

 #define ICPU(model, policy) \
@@ -730,6 +742,8 @@

        pr_info("Intel pstate controlling: cpu %d\n", cpunum);

+       cpu->active_flag = 0;
+
        return 0;
 }