Reenabled linux-xen, added patches for Xen Kernel Version 2.6.27.31,

[people/pmueller/ipfire-2.x.git] / src / patches / suse-2.6.27.31 / patches.drivers / cpufreq_add_idle_microaccounting_6.patch

diff --git a/src/patches/suse-2.6.27.31/patches.drivers/cpufreq_add_idle_microaccounting_6.patch b/src/patches/suse-2.6.27.31/patches.drivers/cpufreq_add_idle_microaccounting_6.patch
new file mode 100644 (file)
index 0000000..c483bcb
--- /dev/null
+++ b/src/patches/suse-2.6.27.31/patches.drivers/cpufreq_add_idle_microaccounting_6.patch
@@ -0,0 +1,111 @@
+From: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
+Subject: cpufreq,ondemand: Use get_cpu_idle_time_us() to get micro-accounted idle information
+
+Use get_cpu_idle_time_us() to get micro-accounted idle information.
+This enables ondemand to get more accurate idle and busy timings
+than the jiffy based calculation. As a result, we can decrease
+the ondemand safety gaurd band from 80-10 to 95-3.
+
+Results in more aggressive power savings.
+
+Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
+Signed-off-by: Thomas Renninger <trenn@suse.de>
+
+---
+ drivers/cpufreq/cpufreq_ondemand.c |   46 ++++++++++++++++++++++++++++++++++++-
+ 1 file changed, 45 insertions(+), 1 deletion(-)
+
+Index: cpufreq.git/drivers/cpufreq/cpufreq_ondemand.c
+===================================================================
+--- cpufreq.git.orig/drivers/cpufreq/cpufreq_ondemand.c        2008-07-31 14:52:15.000000000 -0700
++++ cpufreq.git/drivers/cpufreq/cpufreq_ondemand.c     2008-07-31 14:52:22.000000000 -0700
+@@ -18,6 +18,9 @@
+ #include <linux/jiffies.h>
+ #include <linux/kernel_stat.h>
+ #include <linux/mutex.h>
++#include <linux/hrtimer.h>
++#include <linux/tick.h>
++#include <linux/ktime.h>
+ 
+ /*
+  * dbs is used in this file as a shortform for demandbased switching
+@@ -26,6 +29,8 @@
+ 
+ #define DEF_FREQUENCY_DOWN_DIFFERENTIAL               (10)
+ #define DEF_FREQUENCY_UP_THRESHOLD            (80)
++#define MICRO_FREQUENCY_DOWN_DIFFERENTIAL     (3)
++#define MICRO_FREQUENCY_UP_THRESHOLD          (95)
+ #define MIN_FREQUENCY_UP_THRESHOLD            (11)
+ #define MAX_FREQUENCY_UP_THRESHOLD            (100)
+ 
+@@ -58,6 +63,7 @@ enum {DBS_NORMAL_SAMPLE, DBS_SUB_SAMPLE}
+ struct cpu_dbs_info_s {
+       cputime64_t prev_cpu_idle;
+       cputime64_t prev_cpu_wall;
++      cputime64_t prev_cpu_nice;
+       struct cpufreq_policy *cur_policy;
+       struct delayed_work work;
+       struct cpufreq_frequency_table *freq_table;
+@@ -97,7 +103,8 @@ static struct dbs_tuners {
+       .powersave_bias = 0,
+ };
+ 
+-static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall)
++static inline cputime64_t get_cpu_idle_time_jiffy(unsigned int cpu,
++                                                      cputime64_t *wall)
+ {
+       cputime64_t idle_time;
+       cputime64_t cur_wall_time;
+@@ -123,6 +130,33 @@ static inline cputime64_t get_cpu_idle_t
+       return idle_time;
+ }
+ 
++static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall)
++{
++      u64 idle_time = get_cpu_idle_time_us(cpu, 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;
++}
++
+ /*
+  * Find right freq to be set now with powersave_bias on.
+  * Returns the freq_hi to be used right now and will set freq_hi_jiffies,
+@@ -602,6 +636,16 @@ EXPORT_SYMBOL(cpufreq_gov_ondemand);
+ 
+ static int __init cpufreq_gov_dbs_init(void)
+ {
++      cputime64_t wall;
++      u64 idle_time = get_cpu_idle_time_us(smp_processor_id(), &wall);
++
++      if (idle_time != -1ULL) {
++              /* Idle micro accounting is supported. Use finer thresholds */
++              dbs_tuners_ins.up_threshold = MICRO_FREQUENCY_UP_THRESHOLD;
++              dbs_tuners_ins.down_differential =
++                                      MICRO_FREQUENCY_DOWN_DIFFERENTIAL;
++      }
++
+       kondemand_wq = create_workqueue("kondemand");
+       if (!kondemand_wq) {
+               printk(KERN_ERR "Creation of kondemand failed\n");
+
+--