Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (37 commits)
  sched: Fix SD_POWERSAVING_BALANCE|SD_PREFER_LOCAL vs SD_WAKE_AFFINE
  sched: Stop buddies from hogging the system
  sched: Add new wakeup preemption mode: WAKEUP_RUNNING
  sched: Fix TASK_WAKING & loadaverage breakage
  sched: Disable wakeup balancing
  sched: Rename flags to wake_flags
  sched: Clean up the load_idx selection in select_task_rq_fair
  sched: Optimize cgroup vs wakeup a bit
  sched: x86: Name old_perf in a unique way
  sched: Implement a gentler fair-sleepers feature
  sched: Add SD_PREFER_LOCAL
  sched: Add a few SYNC hint knobs to play with
  sched: Fix sync wakeups again
  sched: Add WF_FORK
  sched: Rename sync arguments
  sched: Rename select_task_rq() argument
  sched: Feature to disable APERF/MPERF cpu_power
  x86: sched: Provide arch implementations using aperf/mperf
  x86: Add generic aperf/mperf code
  x86: Move APERF/MPERF into a X86_FEATURE
  ...

Fix up trivial conflict in arch/x86/include/asm/processor.h due to
nearby addition of amd_get_nb_id() declaration from the EDAC merge.

4 files changed, 73 insertions, 78 deletions

diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index c1f253dac155..8dd30638fe44 100644
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -13,7 +13,7 @@ CFLAGS_common.o		:= $(nostackp)
 
 obj-y                   := intel_cacheinfo.o addon_cpuid_features.o
 obj-y                   += proc.o capflags.o powerflags.o common.o
-obj-y                   += vmware.o hypervisor.o
+obj-y                   += vmware.o hypervisor.o sched.o
 
 obj-$(CONFIG_X86_32)    += bugs.o cmpxchg.o
 obj-$(CONFIG_X86_64)    += bugs_64.o
diff --git a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
index ae9b503220ca..4109679863c1 100644
--- a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
+++ b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
@@ -60,7 +60,6 @@ enum {
 };
 
 #define INTEL_MSR_RANGE         (0xffff)
-#define CPUID_6_ECX_APERFMPERF_CAPABILITY       (0x1)
 
 struct acpi_cpufreq_data {
         struct acpi_processor_performance *acpi_data;
@@ -71,11 +70,7 @@ struct acpi_cpufreq_data {
 
 static DEFINE_PER_CPU(struct acpi_cpufreq_data *, drv_data);
 
-struct acpi_msr_data {
-        u64 saved_aperf, saved_mperf;
-};
-
-static DEFINE_PER_CPU(struct acpi_msr_data, msr_data);
+static DEFINE_PER_CPU(struct aperfmperf, old_perf);
 
 DEFINE_TRACE(power_mark);
 
@@ -244,23 +239,12 @@ static u32 get_cur_val(const struct cpumask *mask)
         return cmd.val;
 }
 
-struct perf_pair {
-        union {
-                struct {
-                        u32 lo;
-                        u32 hi;
-                } split;
-                u64 whole;
-        } aperf, mperf;
-};
-
 /* Called via smp_call_function_single(), on the target CPU */
 static void read_measured_perf_ctrs(void *_cur)
 {
-        struct perf_pair *cur = _cur;
+        struct aperfmperf *am = _cur;
 
-        rdmsr(MSR_IA32_APERF, cur->aperf.split.lo, cur->aperf.split.hi);
-        rdmsr(MSR_IA32_MPERF, cur->mperf.split.lo, cur->mperf.split.hi);
+        get_aperfmperf(am);
 }
 
 /*
@@ -279,63 +263,17 @@ static void read_measured_perf_ctrs(void *_cur)
 static unsigned int get_measured_perf(struct cpufreq_policy *policy,
                                       unsigned int cpu)
 {
-        struct perf_pair readin, cur;
-        unsigned int perf_percent;
+        struct aperfmperf perf;
+        unsigned long ratio;
         unsigned int retval;
 
-        if (smp_call_function_single(cpu, read_measured_perf_ctrs, &readin, 1))
+        if (smp_call_function_single(cpu, read_measured_perf_ctrs, &perf, 1))
                 return 0;
 
-        cur.aperf.whole = readin.aperf.whole -
-                                per_cpu(msr_data, cpu).saved_aperf;
-        cur.mperf.whole = readin.mperf.whole -
-                                per_cpu(msr_data, cpu).saved_mperf;
-        per_cpu(msr_data, cpu).saved_aperf = readin.aperf.whole;
-        per_cpu(msr_data, cpu).saved_mperf = readin.mperf.whole;
-
-#ifdef __i386__
-        /*
-         * We dont want to do 64 bit divide with 32 bit kernel
-         * Get an approximate value. Return failure in case we cannot get
-         * an approximate value.
-         */
-        if (unlikely(cur.aperf.split.hi || cur.mperf.split.hi)) {
-                int shift_count;
-                u32 h;
-
-                h = max_t(u32, cur.aperf.split.hi, cur.mperf.split.hi);
-                shift_count = fls(h);
-
-                cur.aperf.whole >>= shift_count;
-                cur.mperf.whole >>= shift_count;
-        }
-
-        if (((unsigned long)(-1) / 100) < cur.aperf.split.lo) {
-                int shift_count = 7;
-                cur.aperf.split.lo >>= shift_count;
-                cur.mperf.split.lo >>= shift_count;
-        }
-
-        if (cur.aperf.split.lo && cur.mperf.split.lo)
-                perf_percent = (cur.aperf.split.lo * 100) / cur.mperf.split.lo;
-        else
-                perf_percent = 0;
+        ratio = calc_aperfmperf_ratio(&per_cpu(old_perf, cpu), &perf);
+        per_cpu(old_perf, cpu) = perf;
 
-#else
-        if (unlikely(((unsigned long)(-1) / 100) < cur.aperf.whole)) {
-                int shift_count = 7;
-                cur.aperf.whole >>= shift_count;
-                cur.mperf.whole >>= shift_count;
-        }
-
-        if (cur.aperf.whole && cur.mperf.whole)
-                perf_percent = (cur.aperf.whole * 100) / cur.mperf.whole;
-        else
-                perf_percent = 0;
-
-#endif
-
-        retval = (policy->cpuinfo.max_freq * perf_percent) / 100;
+        retval = (policy->cpuinfo.max_freq * ratio) >> APERFMPERF_SHIFT;
 
         return retval;
 }
@@ -731,12 +669,8 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
         acpi_processor_notify_smm(THIS_MODULE);
 
         /* Check for APERF/MPERF support in hardware */
-        if (c->x86_vendor == X86_VENDOR_INTEL && c->cpuid_level >= 6) {
-                unsigned int ecx;
-                ecx = cpuid_ecx(6);
-                if (ecx & CPUID_6_ECX_APERFMPERF_CAPABILITY)
-                        acpi_cpufreq_driver.getavg = get_measured_perf;
-        }
+        if (cpu_has(c, X86_FEATURE_APERFMPERF))
+                acpi_cpufreq_driver.getavg = get_measured_perf;
 
         dprintk("CPU%u - ACPI performance management activated.\n", cpu);
         for (i = 0; i < perf->state_count; i++)
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 80a722a071b5..40e1835b35e8 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -350,6 +350,12 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)
                         set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
         }
 
+        if (c->cpuid_level > 6) {
+                unsigned ecx = cpuid_ecx(6);
+                if (ecx & 0x01)
+                        set_cpu_cap(c, X86_FEATURE_APERFMPERF);
+        }
+
         if (cpu_has_xmm2)
                 set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
         if (cpu_has_ds) {
diff --git a/arch/x86/kernel/cpu/sched.c b/arch/x86/kernel/cpu/sched.c
new file mode 100644
index 000000000000..a640ae5ad201
--- /dev/null
+++ b/arch/x86/kernel/cpu/sched.c
@@ -0,0 +1,55 @@
+#include <linux/sched.h>
+#include <linux/math64.h>
+#include <linux/percpu.h>
+#include <linux/irqflags.h>
+
+#include <asm/cpufeature.h>
+#include <asm/processor.h>
+
+#ifdef CONFIG_SMP
+
+static DEFINE_PER_CPU(struct aperfmperf, old_perf_sched);
+
+static unsigned long scale_aperfmperf(void)
+{
+        struct aperfmperf val, *old = &__get_cpu_var(old_perf_sched);
+        unsigned long ratio, flags;
+
+        local_irq_save(flags);
+        get_aperfmperf(&val);
+        local_irq_restore(flags);
+
+        ratio = calc_aperfmperf_ratio(old, &val);
+        *old = val;
+
+        return ratio;
+}
+
+unsigned long arch_scale_freq_power(struct sched_domain *sd, int cpu)
+{
+        /*
+         * do aperf/mperf on the cpu level because it includes things
+         * like turbo mode, which are relevant to full cores.
+         */
+        if (boot_cpu_has(X86_FEATURE_APERFMPERF))
+                return scale_aperfmperf();
+
+        /*
+         * maybe have something cpufreq here
+         */
+
+        return default_scale_freq_power(sd, cpu);
+}
+
+unsigned long arch_scale_smt_power(struct sched_domain *sd, int cpu)
+{
+        /*
+         * aperf/mperf already includes the smt gain
+         */
+        if (boot_cpu_has(X86_FEATURE_APERFMPERF))
+                return SCHED_LOAD_SCALE;
+
+        return default_scale_smt_power(sd, cpu);
+}
+
+#endif