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authorLinus Torvalds <torvalds@linux-foundation.org>2009-09-17 21:00:02 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-17 21:00:02 -0700
commitdcbf77b9e86e1726f5fbd01bb98820dac06d456e (patch)
tree2f0b728ce70c03e1d0e3461e8a3c3d1fbe68fb90 /arch
parentca043a66ae48c74fa628ec92178f7a54f5b9a106 (diff)
parent29cd8bae396583a2ee9a3340db8c5102acf9f6fd (diff)
downloadlinux-2.6.38-lt-ux500-dcbf77b9e86e1726f5fbd01bb98820dac06d456e.tar.gz
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.
Diffstat (limited to 'arch')
-rw-r--r--arch/ia64/include/asm/topology.h17
-rw-r--r--arch/mips/include/asm/mach-ip27/topology.h1
-rw-r--r--arch/powerpc/include/asm/topology.h9
-rw-r--r--arch/sh/include/asm/topology.h10
-rw-r--r--arch/sparc/include/asm/topology_64.h7
-rw-r--r--arch/x86/include/asm/cpufeature.h1
-rw-r--r--arch/x86/include/asm/processor.h30
-rw-r--r--arch/x86/include/asm/topology.h14
-rw-r--r--arch/x86/kernel/cpu/Makefile2
-rw-r--r--arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c88
-rw-r--r--arch/x86/kernel/cpu/intel.c6
-rw-r--r--arch/x86/kernel/cpu/sched.c55
12 files changed, 129 insertions, 111 deletions
diff --git a/arch/ia64/include/asm/topology.h b/arch/ia64/include/asm/topology.h
index 7b4c8c70b2d..d0141fbf51d 100644
--- a/arch/ia64/include/asm/topology.h
+++ b/arch/ia64/include/asm/topology.h
@@ -61,12 +61,13 @@ void build_cpu_to_node_map(void);
.cache_nice_tries = 2, \
.busy_idx = 2, \
.idle_idx = 1, \
- .newidle_idx = 2, \
- .wake_idx = 1, \
- .forkexec_idx = 1, \
+ .newidle_idx = 0, \
+ .wake_idx = 0, \
+ .forkexec_idx = 0, \
.flags = SD_LOAD_BALANCE \
| SD_BALANCE_NEWIDLE \
| SD_BALANCE_EXEC \
+ | SD_BALANCE_FORK \
| SD_WAKE_AFFINE, \
.last_balance = jiffies, \
.balance_interval = 1, \
@@ -85,14 +86,14 @@ void build_cpu_to_node_map(void);
.cache_nice_tries = 2, \
.busy_idx = 3, \
.idle_idx = 2, \
- .newidle_idx = 2, \
- .wake_idx = 1, \
- .forkexec_idx = 1, \
+ .newidle_idx = 0, \
+ .wake_idx = 0, \
+ .forkexec_idx = 0, \
.flags = SD_LOAD_BALANCE \
+ | SD_BALANCE_NEWIDLE \
| SD_BALANCE_EXEC \
| SD_BALANCE_FORK \
- | SD_SERIALIZE \
- | SD_WAKE_BALANCE, \
+ | SD_SERIALIZE, \
.last_balance = jiffies, \
.balance_interval = 64, \
.nr_balance_failed = 0, \
diff --git a/arch/mips/include/asm/mach-ip27/topology.h b/arch/mips/include/asm/mach-ip27/topology.h
index 07547231e07..23059170700 100644
--- a/arch/mips/include/asm/mach-ip27/topology.h
+++ b/arch/mips/include/asm/mach-ip27/topology.h
@@ -48,7 +48,6 @@ extern unsigned char __node_distances[MAX_COMPACT_NODES][MAX_COMPACT_NODES];
.cache_nice_tries = 1, \
.flags = SD_LOAD_BALANCE \
| SD_BALANCE_EXEC \
- | SD_WAKE_BALANCE, \
.last_balance = jiffies, \
.balance_interval = 1, \
.nr_balance_failed = 0, \
diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm/topology.h
index 054a16d6808..394edcbcce7 100644
--- a/arch/powerpc/include/asm/topology.h
+++ b/arch/powerpc/include/asm/topology.h
@@ -57,14 +57,13 @@ static inline int pcibus_to_node(struct pci_bus *bus)
.cache_nice_tries = 1, \
.busy_idx = 3, \
.idle_idx = 1, \
- .newidle_idx = 2, \
- .wake_idx = 1, \
+ .newidle_idx = 0, \
+ .wake_idx = 0, \
.flags = SD_LOAD_BALANCE \
| SD_BALANCE_EXEC \
+ | SD_BALANCE_FORK \
| SD_BALANCE_NEWIDLE \
- | SD_WAKE_IDLE \
- | SD_SERIALIZE \
- | SD_WAKE_BALANCE, \
+ | SD_SERIALIZE, \
.last_balance = jiffies, \
.balance_interval = 1, \
.nr_balance_failed = 0, \
diff --git a/arch/sh/include/asm/topology.h b/arch/sh/include/asm/topology.h
index b69ee850906..f8c40cc6505 100644
--- a/arch/sh/include/asm/topology.h
+++ b/arch/sh/include/asm/topology.h
@@ -15,14 +15,14 @@
.cache_nice_tries = 2, \
.busy_idx = 3, \
.idle_idx = 2, \
- .newidle_idx = 2, \
- .wake_idx = 1, \
- .forkexec_idx = 1, \
+ .newidle_idx = 0, \
+ .wake_idx = 0, \
+ .forkexec_idx = 0, \
.flags = SD_LOAD_BALANCE \
| SD_BALANCE_FORK \
| SD_BALANCE_EXEC \
- | SD_SERIALIZE \
- | SD_WAKE_BALANCE, \
+ | SD_BALANCE_NEWIDLE \
+ | SD_SERIALIZE, \
.last_balance = jiffies, \
.balance_interval = 1, \
.nr_balance_failed = 0, \
diff --git a/arch/sparc/include/asm/topology_64.h b/arch/sparc/include/asm/topology_64.h
index e5ea8d33242..26cd25c0839 100644
--- a/arch/sparc/include/asm/topology_64.h
+++ b/arch/sparc/include/asm/topology_64.h
@@ -52,13 +52,12 @@ static inline int pcibus_to_node(struct pci_bus *pbus)
.busy_idx = 3, \
.idle_idx = 2, \
.newidle_idx = 0, \
- .wake_idx = 1, \
- .forkexec_idx = 1, \
+ .wake_idx = 0, \
+ .forkexec_idx = 0, \
.flags = SD_LOAD_BALANCE \
| SD_BALANCE_FORK \
| SD_BALANCE_EXEC \
- | SD_SERIALIZE \
- | SD_WAKE_BALANCE, \
+ | SD_SERIALIZE, \
.last_balance = jiffies, \
.balance_interval = 1, \
}
diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 847fee6493a..9cfc88b9774 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -96,6 +96,7 @@
#define X86_FEATURE_CLFLUSH_MONITOR (3*32+25) /* "" clflush reqd with monitor */
#define X86_FEATURE_EXTD_APICID (3*32+26) /* has extended APICID (8 bits) */
#define X86_FEATURE_AMD_DCM (3*32+27) /* multi-node processor */
+#define X86_FEATURE_APERFMPERF (3*32+28) /* APERFMPERF */
/* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
#define X86_FEATURE_XMM3 (4*32+ 0) /* "pni" SSE-3 */
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 42a3f936dad..c3429e8b242 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -27,6 +27,7 @@ struct mm_struct;
#include <linux/cpumask.h>
#include <linux/cache.h>
#include <linux/threads.h>
+#include <linux/math64.h>
#include <linux/init.h>
/*
@@ -1022,4 +1023,33 @@ extern int set_tsc_mode(unsigned int val);
extern int amd_get_nb_id(int cpu);
+struct aperfmperf {
+ u64 aperf, mperf;
+};
+
+static inline void get_aperfmperf(struct aperfmperf *am)
+{
+ WARN_ON_ONCE(!boot_cpu_has(X86_FEATURE_APERFMPERF));
+
+ rdmsrl(MSR_IA32_APERF, am->aperf);
+ rdmsrl(MSR_IA32_MPERF, am->mperf);
+}
+
+#define APERFMPERF_SHIFT 10
+
+static inline
+unsigned long calc_aperfmperf_ratio(struct aperfmperf *old,
+ struct aperfmperf *new)
+{
+ u64 aperf = new->aperf - old->aperf;
+ u64 mperf = new->mperf - old->mperf;
+ unsigned long ratio = aperf;
+
+ mperf >>= APERFMPERF_SHIFT;
+ if (mperf)
+ ratio = div64_u64(aperf, mperf);
+
+ return ratio;
+}
+
#endif /* _ASM_X86_PROCESSOR_H */
diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index 26d06e052a1..6f0695d744b 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -116,15 +116,11 @@ extern unsigned long node_remap_size[];
# define SD_CACHE_NICE_TRIES 1
# define SD_IDLE_IDX 1
-# define SD_NEWIDLE_IDX 2
-# define SD_FORKEXEC_IDX 0
#else
# define SD_CACHE_NICE_TRIES 2
# define SD_IDLE_IDX 2
-# define SD_NEWIDLE_IDX 2
-# define SD_FORKEXEC_IDX 1
#endif
@@ -137,22 +133,20 @@ extern unsigned long node_remap_size[];
.cache_nice_tries = SD_CACHE_NICE_TRIES, \
.busy_idx = 3, \
.idle_idx = SD_IDLE_IDX, \
- .newidle_idx = SD_NEWIDLE_IDX, \
- .wake_idx = 1, \
- .forkexec_idx = SD_FORKEXEC_IDX, \
+ .newidle_idx = 0, \
+ .wake_idx = 0, \
+ .forkexec_idx = 0, \
\
.flags = 1*SD_LOAD_BALANCE \
| 1*SD_BALANCE_NEWIDLE \
| 1*SD_BALANCE_EXEC \
| 1*SD_BALANCE_FORK \
- | 0*SD_WAKE_IDLE \
+ | 0*SD_BALANCE_WAKE \
| 1*SD_WAKE_AFFINE \
- | 1*SD_WAKE_BALANCE \
| 0*SD_SHARE_CPUPOWER \
| 0*SD_POWERSAVINGS_BALANCE \
| 0*SD_SHARE_PKG_RESOURCES \
| 1*SD_SERIALIZE \
- | 1*SD_WAKE_IDLE_FAR \
| 0*SD_PREFER_SIBLING \
, \
.last_balance = jiffies, \
diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index c1f253dac15..8dd30638fe4 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 ae9b503220c..4109679863c 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 80a722a071b..40e1835b35e 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 00000000000..a640ae5ad20
--- /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