sched: Allow for overlapping sched_domain spans

[mirror_ubuntu-kernels.git] / include / linux / sched.h

diff --git a/include/linux/sched.h b/include/linux/sched.h
index a837b20ba190330c23b59ec5a3fb584fc9f6308f..bde99d5358dc84af2fceb2a20199bd9ed7556426 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -808,7 +808,7 @@ enum cpu_idle_type {
  * when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the
  * increased costs.
  */
-#if BITS_PER_LONG > 32
+#if 0 /* BITS_PER_LONG > 32 -- currently broken: it increases power usage under light load  */
 # define SCHED_LOAD_RESOLUTION 10
 # define scale_load(w)         ((w) << SCHED_LOAD_RESOLUTION)
 # define scale_load_down(w)    ((w) >> SCHED_LOAD_RESOLUTION)
@@ -844,6 +844,7 @@ enum cpu_idle_type {
 #define SD_SERIALIZE           0x0400  /* Only a single load balancing instance */
 #define SD_ASYM_PACKING                0x0800  /* Place busy groups earlier in the domain */
 #define SD_PREFER_SIBLING      0x1000  /* Prefer to place tasks in a sibling domain */
+#define SD_OVERLAP             0x2000  /* sched_domains of this level overlap */
 
 enum powersavings_balance_level {
        POWERSAVINGS_BALANCE_NONE = 0,  /* No power saving load balance */
@@ -893,16 +894,21 @@ static inline int sd_power_saving_flags(void)
        return 0;
 }
 
-struct sched_group {
-       struct sched_group *next;       /* Must be a circular list */
+struct sched_group_power {
        atomic_t ref;
-
        /*
         * CPU power of this group, SCHED_LOAD_SCALE being max power for a
         * single CPU.
         */
-       unsigned int cpu_power, cpu_power_orig;
+       unsigned int power, power_orig;
+};
+
+struct sched_group {
+       struct sched_group *next;       /* Must be a circular list */
+       atomic_t ref;
+
        unsigned int group_weight;
+       struct sched_group_power *sgp;
 
        /*
         * The CPUs this group covers.