2 files changed, 47 insertions, 28 deletions

diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
index 5c28b37dea11..fb039cd345d8 100644
--- a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
+++ b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
@@ -939,10 +939,25 @@ static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
         free_cpumask_var(data->acpi_data.shared_cpu_map);
 }
 
+static int get_transition_latency(struct powernow_k8_data *data)
+{
+        int max_latency = 0;
+        int i;
+        for (i = 0; i < data->acpi_data.state_count; i++) {
+                int cur_latency = data->acpi_data.states[i].transition_latency
+                        + data->acpi_data.states[i].bus_master_latency;
+                if (cur_latency > max_latency)
+                        max_latency = cur_latency;
+        }
+        /* value in usecs, needs to be in nanoseconds */
+        return 1000 * max_latency;
+}
+
 #else
 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data) { return -ENODEV; }
 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data) { return; }
 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index) { return; }
+static int get_transition_latency(struct powernow_k8_data *data) { return 0; }
 #endif /* CONFIG_X86_POWERNOW_K8_ACPI */
 
 /* Take a frequency, and issue the fid/vid transition command */
@@ -1173,7 +1188,13 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
                 if (rc) {
                         goto err_out;
                 }
-        }
+                /* Take a crude guess here.
+                 * That guess was in microseconds, so multiply with 1000 */
+                pol->cpuinfo.transition_latency = (
+                         ((data->rvo + 8) * data->vstable * VST_UNITS_20US) +
+                         ((1 << data->irt) * 30)) * 1000;
+        } else /* ACPI _PSS objects available */
+                pol->cpuinfo.transition_latency = get_transition_latency(data);
 
         /* only run on specific CPU from here on */
         oldmask = current->cpus_allowed;
@@ -1204,11 +1225,6 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
                 cpumask_copy(pol->cpus, &per_cpu(cpu_core_map, pol->cpu));
         data->available_cores = pol->cpus;
 
-        /* Take a crude guess here.
-         * That guess was in microseconds, so multiply with 1000 */
-        pol->cpuinfo.transition_latency = (((data->rvo + 8) * data->vstable * VST_UNITS_20US)
-            + (3 * (1 << data->irt) * 10)) * 1000;
-
         if (cpu_family == CPU_HW_PSTATE)
                 pol->cur = find_khz_freq_from_pstate(data->powernow_table, data->currpstate);
         else
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index 6a2b036c9389..6f45b1658a67 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -117,11 +117,7 @@ static inline cputime64_t get_cpu_idle_time_jiffy(unsigned int cpu,
         busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.irq);
         busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.softirq);
         busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.steal);
-
-        if (!dbs_tuners_ins.ignore_nice) {
-                busy_time = cputime64_add(busy_time,
-                                kstat_cpu(cpu).cpustat.nice);
-        }
+        busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.nice);
 
         idle_time = cputime64_sub(cur_wall_time, busy_time);
         if (wall)
@@ -137,23 +133,6 @@ static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall)
         if (idle_time == -1ULL)
                 return get_cpu_idle_time_jiffy(cpu, wall);
 
-        if (dbs_tuners_ins.ignore_nice) {
-                cputime64_t cur_nice;
-                unsigned long cur_nice_jiffies;
-                struct cpu_dbs_info_s *dbs_info;
-
-                dbs_info = &per_cpu(cpu_dbs_info, cpu);
-                cur_nice = cputime64_sub(kstat_cpu(cpu).cpustat.nice,
-                                         dbs_info->prev_cpu_nice);
-                /*
-                 * Assumption: nice time between sampling periods will be
-                 * less than 2^32 jiffies for 32 bit sys
-                 */
-                cur_nice_jiffies = (unsigned long)
-                                        cputime64_to_jiffies64(cur_nice);
-                dbs_info->prev_cpu_nice = kstat_cpu(cpu).cpustat.nice;
-                return idle_time + jiffies_to_usecs(cur_nice_jiffies);
-        }
         return idle_time;
 }
 
@@ -319,6 +298,9 @@ static ssize_t store_ignore_nice_load(struct cpufreq_policy *policy,
                 dbs_info = &per_cpu(cpu_dbs_info, j);
                 dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
                                                 &dbs_info->prev_cpu_wall);
+                if (dbs_tuners_ins.ignore_nice)
+                        dbs_info->prev_cpu_nice = kstat_cpu(j).cpustat.nice;
+
         }
         mutex_unlock(&dbs_mutex);
 
@@ -419,6 +401,23 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
                                 j_dbs_info->prev_cpu_idle);
                 j_dbs_info->prev_cpu_idle = cur_idle_time;
 
+                if (dbs_tuners_ins.ignore_nice) {
+                        cputime64_t cur_nice;
+                        unsigned long cur_nice_jiffies;
+
+                        cur_nice = cputime64_sub(kstat_cpu(j).cpustat.nice,
+                                         j_dbs_info->prev_cpu_nice);
+                        /*
+                         * Assumption: nice time between sampling periods will
+                         * be less than 2^32 jiffies for 32 bit sys
+                         */
+                        cur_nice_jiffies = (unsigned long)
+                                        cputime64_to_jiffies64(cur_nice);
+
+                        j_dbs_info->prev_cpu_nice = kstat_cpu(j).cpustat.nice;
+                        idle_time += jiffies_to_usecs(cur_nice_jiffies);
+                }
+
                 if (unlikely(!wall_time || wall_time < idle_time))
                         continue;
 
@@ -575,6 +574,10 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 
                         j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
                                                 &j_dbs_info->prev_cpu_wall);
+                        if (dbs_tuners_ins.ignore_nice) {
+                                j_dbs_info->prev_cpu_nice =
+                                                kstat_cpu(j).cpustat.nice;
+                        }
                 }
                 this_dbs_info->cpu = cpu;
                 /*