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

Pull scheduler changes from Ingo Molnar:
 "Continued quest to clean up and enhance the cputime code by Frederic
  Weisbecker, in preparation for future tickless kernel features.

  Other than that, smallish changes."

Fix up trivial conflicts due to additions next to each other in arch/{x86/}Kconfig

* 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (24 commits)
  cputime: Make finegrained irqtime accounting generally available
  cputime: Gather time/stats accounting config options into a single menu
  ia64: Reuse system and user vtime accounting functions on task switch
  ia64: Consolidate user vtime accounting
  vtime: Consolidate system/idle context detection
  cputime: Use a proper subsystem naming for vtime related APIs
  sched: cpu_power: enable ARCH_POWER
  sched/nohz: Clean up select_nohz_load_balancer()
  sched: Fix load avg vs. cpu-hotplug
  sched: Remove __ARCH_WANT_INTERRUPTS_ON_CTXSW
  sched: Fix nohz_idle_balance()
  sched: Remove useless code in yield_to()
  sched: Add time unit suffix to sched sysctl knobs
  sched/debug: Limit sd->*_idx range on sysctl
  sched: Remove AFFINE_WAKEUPS feature flag
  s390: Remove leftover account_tick_vtime() header
  cputime: Consolidate vtime handling on context switch
  sched: Move cputime code to its own file
  cputime: Generalize CONFIG_VIRT_CPU_ACCOUNTING
  tile: Remove SD_PREFER_LOCAL leftover
  ...

14 files changed, 89 insertions, 119 deletions

diff --git a/arch/Kconfig b/arch/Kconfig
index 1a7b468abf4a..a62965d057f6 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -304,4 +304,13 @@ config HAVE_RCU_USER_QS
           are already protected inside rcu_irq_enter/rcu_irq_exit() but
           preemption or signal handling on irq exit still need to be protected.
 
+config HAVE_VIRT_CPU_ACCOUNTING
+        bool
+
+config HAVE_IRQ_TIME_ACCOUNTING
+        bool
+        help
+          Archs need to ensure they use a high enough resolution clock to
+          support irq time accounting and then call enable_sched_clock_irqtime().
+
 source "kernel/gcov/Kconfig"
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 310cf5781fad..3c720ef6c32d 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -25,6 +25,7 @@ config IA64
         select HAVE_GENERIC_HARDIRQS
         select HAVE_MEMBLOCK
         select HAVE_MEMBLOCK_NODE_MAP
+        select HAVE_VIRT_CPU_ACCOUNTING
         select ARCH_DISCARD_MEMBLOCK
         select GENERIC_IRQ_PROBE
         select GENERIC_PENDING_IRQ if SMP
@@ -340,17 +341,6 @@ config FORCE_MAX_ZONEORDER
         default "17" if HUGETLB_PAGE
         default "11"
 
-config VIRT_CPU_ACCOUNTING
-        bool "Deterministic task and CPU time accounting"
-        default n
-        help
-          Select this option to enable more accurate task and CPU time
-          accounting.  This is done by reading a CPU counter on each
-          kernel entry and exit and on transitions within the kernel
-          between system, softirq and hardirq state, so there is a
-          small performance impact.
-          If in doubt, say N here.
-
 config SMP
         bool "Symmetric multi-processing support"
         select USE_GENERIC_SMP_HELPERS
diff --git a/arch/ia64/include/asm/switch_to.h b/arch/ia64/include/asm/switch_to.h
index cb2412fcd17f..d38c7ea5eea5 100644
--- a/arch/ia64/include/asm/switch_to.h
+++ b/arch/ia64/include/asm/switch_to.h
@@ -30,13 +30,6 @@ extern struct task_struct *ia64_switch_to (void *next_task);
 extern void ia64_save_extra (struct task_struct *task);
 extern void ia64_load_extra (struct task_struct *task);
 
-#ifdef CONFIG_VIRT_CPU_ACCOUNTING
-extern void ia64_account_on_switch (struct task_struct *prev, struct task_struct *next);
-# define IA64_ACCOUNT_ON_SWITCH(p,n) ia64_account_on_switch(p,n)
-#else
-# define IA64_ACCOUNT_ON_SWITCH(p,n)
-#endif
-
 #ifdef CONFIG_PERFMON
   DECLARE_PER_CPU(unsigned long, pfm_syst_info);
 # define PERFMON_IS_SYSWIDE() (__get_cpu_var(pfm_syst_info) & 0x1)
@@ -49,7 +42,6 @@ extern void ia64_account_on_switch (struct task_struct *prev, struct task_struct
          || PERFMON_IS_SYSWIDE())
 
 #define __switch_to(prev,next,last) do {                                                         \
-        IA64_ACCOUNT_ON_SWITCH(prev, next);                                                      \
         if (IA64_HAS_EXTRA_STATE(prev))                                                          \
                 ia64_save_extra(prev);                                                           \
         if (IA64_HAS_EXTRA_STATE(next))                                                          \
diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c
index ecc904b33c5f..80ff9acc5edf 100644
--- a/arch/ia64/kernel/time.c
+++ b/arch/ia64/kernel/time.c
@@ -83,32 +83,36 @@ static struct clocksource *itc_clocksource;
 
 extern cputime_t cycle_to_cputime(u64 cyc);
 
+static void vtime_account_user(struct task_struct *tsk)
+{
+        cputime_t delta_utime;
+        struct thread_info *ti = task_thread_info(tsk);
+
+        if (ti->ac_utime) {
+                delta_utime = cycle_to_cputime(ti->ac_utime);
+                account_user_time(tsk, delta_utime, delta_utime);
+                ti->ac_utime = 0;
+        }
+}
+
 /*
  * Called from the context switch with interrupts disabled, to charge all
  * accumulated times to the current process, and to prepare accounting on
  * the next process.
  */
-void ia64_account_on_switch(struct task_struct *prev, struct task_struct *next)
+void vtime_task_switch(struct task_struct *prev)
 {
         struct thread_info *pi = task_thread_info(prev);
-        struct thread_info *ni = task_thread_info(next);
-        cputime_t delta_stime, delta_utime;
-        __u64 now;
+        struct thread_info *ni = task_thread_info(current);
 
-        now = ia64_get_itc();
-
-        delta_stime = cycle_to_cputime(pi->ac_stime + (now - pi->ac_stamp));
         if (idle_task(smp_processor_id()) != prev)
-                account_system_time(prev, 0, delta_stime, delta_stime);
+                vtime_account_system(prev);
         else
-                account_idle_time(delta_stime);
+                vtime_account_idle(prev);
 
-        if (pi->ac_utime) {
-                delta_utime = cycle_to_cputime(pi->ac_utime);
-                account_user_time(prev, delta_utime, delta_utime);
-        }
+        vtime_account_user(prev);
 
-        pi->ac_stamp = ni->ac_stamp = now;
+        pi->ac_stamp = ni->ac_stamp;
         ni->ac_stime = ni->ac_utime = 0;
 }
 
@@ -116,29 +120,32 @@ void ia64_account_on_switch(struct task_struct *prev, struct task_struct *next)
  * Account time for a transition between system, hard irq or soft irq state.
  * Note that this function is called with interrupts enabled.
  */
-void account_system_vtime(struct task_struct *tsk)
+static cputime_t vtime_delta(struct task_struct *tsk)
 {
         struct thread_info *ti = task_thread_info(tsk);
-        unsigned long flags;
         cputime_t delta_stime;
         __u64 now;
 
-        local_irq_save(flags);
-
         now = ia64_get_itc();
 
         delta_stime = cycle_to_cputime(ti->ac_stime + (now - ti->ac_stamp));
-        if (irq_count() || idle_task(smp_processor_id()) != tsk)
-                account_system_time(tsk, 0, delta_stime, delta_stime);
-        else
-                account_idle_time(delta_stime);
         ti->ac_stime = 0;
-
         ti->ac_stamp = now;
 
-        local_irq_restore(flags);
+        return delta_stime;
+}
+
+void vtime_account_system(struct task_struct *tsk)
+{
+        cputime_t delta = vtime_delta(tsk);
+
+        account_system_time(tsk, 0, delta, delta);
+}
+
+void vtime_account_idle(struct task_struct *tsk)
+{
+        account_idle_time(vtime_delta(tsk));
 }
-EXPORT_SYMBOL_GPL(account_system_vtime);
 
 /*
  * Called from the timer interrupt handler to charge accumulated user time
@@ -146,14 +153,7 @@ EXPORT_SYMBOL_GPL(account_system_vtime);
  */
 void account_process_tick(struct task_struct *p, int user_tick)
 {
-        struct thread_info *ti = task_thread_info(p);
-        cputime_t delta_utime;
-
-        if (ti->ac_utime) {
-                delta_utime = cycle_to_cputime(ti->ac_utime);
-                account_user_time(p, delta_utime, delta_utime);
-                ti->ac_utime = 0;
-        }
+        vtime_account_user(p);
 }
 
 #endif /* CONFIG_VIRT_CPU_ACCOUNTING */
diff --git a/arch/powerpc/include/asm/time.h b/arch/powerpc/include/asm/time.h
index 3b4b4a8da922..c1f267694acb 100644
--- a/arch/powerpc/include/asm/time.h
+++ b/arch/powerpc/include/asm/time.h
@@ -197,12 +197,6 @@ struct cpu_usage {
 
 DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
 
-#if defined(CONFIG_VIRT_CPU_ACCOUNTING)
-#define account_process_vtime(tsk)              account_process_tick(tsk, 0)
-#else
-#define account_process_vtime(tsk)              do { } while (0)
-#endif
-
 extern void secondary_cpu_time_init(void);
 
 DECLARE_PER_CPU(u64, decrementers_next_tb);
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 1a1f2ddfb581..e9cb51f5f801 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -514,9 +514,6 @@ struct task_struct *__switch_to(struct task_struct *prev,
 
         local_irq_save(flags);
 
-        account_system_vtime(current);
-        account_process_vtime(current);
-
         /*
          * We can't take a PMU exception inside _switch() since there is a
          * window where the kernel stack SLB and the kernel stack are out
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index e49e93191b69..eaa9d0e6abca 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -291,13 +291,12 @@ static inline u64 calculate_stolen_time(u64 stop_tb)
  * Account time for a transition between system, hard irq
  * or soft irq state.
  */
-void account_system_vtime(struct task_struct *tsk)
+static u64 vtime_delta(struct task_struct *tsk,
+                        u64 *sys_scaled, u64 *stolen)
 {
-        u64 now, nowscaled, delta, deltascaled;
-        unsigned long flags;
-        u64 stolen, udelta, sys_scaled, user_scaled;
+        u64 now, nowscaled, deltascaled;
+        u64 udelta, delta, user_scaled;
 
-        local_irq_save(flags);
         now = mftb();
         nowscaled = read_spurr(now);
         get_paca()->system_time += now - get_paca()->starttime;
@@ -305,7 +304,7 @@ void account_system_vtime(struct task_struct *tsk)
         deltascaled = nowscaled - get_paca()->startspurr;
         get_paca()->startspurr = nowscaled;
 
-        stolen = calculate_stolen_time(now);
+        *stolen = calculate_stolen_time(now);
 
         delta = get_paca()->system_time;
         get_paca()->system_time = 0;
@@ -322,35 +321,45 @@ void account_system_vtime(struct task_struct *tsk)
          * the user ticks get saved up in paca->user_time_scaled to be
          * used by account_process_tick.
          */
-        sys_scaled = delta;
+        *sys_scaled = delta;
         user_scaled = udelta;
         if (deltascaled != delta + udelta) {
                 if (udelta) {
-                        sys_scaled = deltascaled * delta / (delta + udelta);
-                        user_scaled = deltascaled - sys_scaled;
+                        *sys_scaled = deltascaled * delta / (delta + udelta);
+                        user_scaled = deltascaled - *sys_scaled;
                 } else {
-                        sys_scaled = deltascaled;
+                        *sys_scaled = deltascaled;
                 }
         }
         get_paca()->user_time_scaled += user_scaled;
 
-        if (in_interrupt() || idle_task(smp_processor_id()) != tsk) {
-                account_system_time(tsk, 0, delta, sys_scaled);
-                if (stolen)
-                        account_steal_time(stolen);
-        } else {
-                account_idle_time(delta + stolen);
-        }
-        local_irq_restore(flags);
+        return delta;
+}
+
+void vtime_account_system(struct task_struct *tsk)
+{
+        u64 delta, sys_scaled, stolen;
+
+        delta = vtime_delta(tsk, &sys_scaled, &stolen);
+        account_system_time(tsk, 0, delta, sys_scaled);
+        if (stolen)
+                account_steal_time(stolen);
+}
+
+void vtime_account_idle(struct task_struct *tsk)
+{
+        u64 delta, sys_scaled, stolen;
+
+        delta = vtime_delta(tsk, &sys_scaled, &stolen);
+        account_idle_time(delta + stolen);
 }
-EXPORT_SYMBOL_GPL(account_system_vtime);
 
 /*
  * Transfer the user and system times accumulated in the paca
  * by the exception entry and exit code to the generic process
  * user and system time records.
  * Must be called with interrupts disabled.
- * Assumes that account_system_vtime() has been called recently
+ * Assumes that vtime_account() has been called recently
  * (i.e. since the last entry from usermode) so that
  * get_paca()->user_time_scaled is up to date.
  */
@@ -366,6 +375,12 @@ void account_process_tick(struct task_struct *tsk, int user_tick)
         account_user_time(tsk, utime, utimescaled);
 }
 
+void vtime_task_switch(struct task_struct *prev)
+{
+        vtime_account(prev);
+        account_process_tick(prev, 0);
+}
+
 #else /* ! CONFIG_VIRT_CPU_ACCOUNTING */
 #define calc_cputime_factors()
 #endif
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 30fd01de6bed..72afd2888cad 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -1,6 +1,7 @@
 config PPC64
         bool "64-bit kernel"
         default n
+        select HAVE_VIRT_CPU_ACCOUNTING
         help
           This option selects whether a 32-bit or a 64-bit kernel
           will be built.
@@ -337,21 +338,6 @@ config PPC_MM_SLICES
         default y if (!PPC_FSL_BOOK3E && PPC64 && HUGETLB_PAGE) || (PPC_STD_MMU_64 && PPC_64K_PAGES)
         default n
 
-config VIRT_CPU_ACCOUNTING
-        bool "Deterministic task and CPU time accounting"
-        depends on PPC64
-        default y
-        help
-          Select this option to enable more accurate task and CPU time
-          accounting.  This is done by reading a CPU counter on each
-          kernel entry and exit and on transitions within the kernel
-          between system, softirq and hardirq state, so there is a
-          small performance impact.  This also enables accounting of
-          stolen time on logically-partitioned systems running on
-          IBM POWER5-based machines.
-
-          If in doubt, say Y here.
-
 config PPC_HAVE_PMU_SUPPORT
        bool
 
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 107610e01a29..f5ab543396da 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -49,9 +49,6 @@ config GENERIC_LOCKBREAK
 config PGSTE
         def_bool y if KVM
 
-config VIRT_CPU_ACCOUNTING
-        def_bool y
-
 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
         def_bool y
 
@@ -89,6 +86,8 @@ config S390
         select HAVE_MEMBLOCK
         select HAVE_MEMBLOCK_NODE_MAP
         select HAVE_CMPXCHG_LOCAL
+        select HAVE_VIRT_CPU_ACCOUNTING
+        select VIRT_CPU_ACCOUNTING
         select ARCH_DISCARD_MEMBLOCK
         select BUILDTIME_EXTABLE_SORT
         select ARCH_INLINE_SPIN_TRYLOCK
diff --git a/arch/s390/include/asm/cputime.h b/arch/s390/include/asm/cputime.h
index 8709bdef233c..023d5ae24482 100644
--- a/arch/s390/include/asm/cputime.h
+++ b/arch/s390/include/asm/cputime.h
@@ -12,6 +12,9 @@
 #include <linux/spinlock.h>
 #include <asm/div64.h>
 
+
+#define __ARCH_HAS_VTIME_ACCOUNT
+
 /* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */
 
 typedef unsigned long long __nocast cputime_t;
diff --git a/arch/s390/include/asm/switch_to.h b/arch/s390/include/asm/switch_to.h
index f223068b7822..314cc9426fc4 100644
--- a/arch/s390/include/asm/switch_to.h
+++ b/arch/s390/include/asm/switch_to.h
@@ -89,12 +89,8 @@ static inline void restore_access_regs(unsigned int *acrs)
         prev = __switch_to(prev,next);                                  \
 } while (0)
 
-extern void account_vtime(struct task_struct *, struct task_struct *);
-extern void account_tick_vtime(struct task_struct *);
-
 #define finish_arch_switch(prev) do {                                        \
         set_fs(current->thread.mm_segment);                                  \
-        account_vtime(prev, current);                                        \
 } while (0)
 
 #endif /* __ASM_SWITCH_TO_H */
diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
index 4fc97b40a6e1..cb5093c26d16 100644
--- a/arch/s390/kernel/vtime.c
+++ b/arch/s390/kernel/vtime.c
@@ -99,7 +99,7 @@ static int do_account_vtime(struct task_struct *tsk, int hardirq_offset)
         return virt_timer_forward(user + system);
 }
 
-void account_vtime(struct task_struct *prev, struct task_struct *next)
+void vtime_task_switch(struct task_struct *prev)
 {
         struct thread_info *ti;
 
@@ -107,7 +107,7 @@ void account_vtime(struct task_struct *prev, struct task_struct *next)
         ti = task_thread_info(prev);
         ti->user_timer = S390_lowcore.user_timer;
         ti->system_timer = S390_lowcore.system_timer;
-        ti = task_thread_info(next);
+        ti = task_thread_info(current);
         S390_lowcore.user_timer = ti->user_timer;
         S390_lowcore.system_timer = ti->system_timer;
 }
@@ -122,7 +122,7 @@ void account_process_tick(struct task_struct *tsk, int user_tick)
  * Update process times based on virtual cpu times stored by entry.S
  * to the lowcore fields user_timer, system_timer & steal_clock.
  */
-void account_system_vtime(struct task_struct *tsk)
+void vtime_account(struct task_struct *tsk)
 {
         struct thread_info *ti = task_thread_info(tsk);
         u64 timer, system;
@@ -138,7 +138,7 @@ void account_system_vtime(struct task_struct *tsk)
 
         virt_timer_forward(system);
 }
-EXPORT_SYMBOL_GPL(account_system_vtime);
+EXPORT_SYMBOL_GPL(vtime_account);
 
 void __kprobes vtime_stop_cpu(void)
 {
diff --git a/arch/tile/include/asm/topology.h b/arch/tile/include/asm/topology.h
index 7a7ce390534f..d5e86c9f74fd 100644
--- a/arch/tile/include/asm/topology.h
+++ b/arch/tile/include/asm/topology.h
@@ -69,7 +69,6 @@ static inline const struct cpumask *cpumask_of_node(int node)
                                 | 1*SD_BALANCE_FORK                     \
                                 | 0*SD_BALANCE_WAKE                     \
                                 | 0*SD_WAKE_AFFINE                      \
-                                | 0*SD_PREFER_LOCAL                     \
                                 | 0*SD_SHARE_CPUPOWER                   \
                                 | 0*SD_SHARE_PKG_RESOURCES              \
                                 | 0*SD_SERIALIZE                        \
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 8ff1f56a0188..488ba8da8fef 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -101,6 +101,7 @@ config X86
         select GENERIC_STRNCPY_FROM_USER
         select GENERIC_STRNLEN_USER
         select HAVE_RCU_USER_QS if X86_64
+        select HAVE_IRQ_TIME_ACCOUNTING
 
 config INSTRUCTION_DECODER
         def_bool (KPROBES || PERF_EVENTS || UPROBES)
@@ -800,17 +801,6 @@ config SCHED_MC
           making when dealing with multi-core CPU chips at a cost of slightly
           increased overhead in some places. If unsure say N here.
 
-config IRQ_TIME_ACCOUNTING
-        bool "Fine granularity task level IRQ time accounting"
-        default n
-        ---help---
-          Select this option to enable fine granularity task irq time
-          accounting. This is done by reading a timestamp on each
-          transitions between softirq and hardirq state, so there can be a
-          small performance impact.
-
-          If in doubt, say N here.
-
 source "kernel/Kconfig.preempt"
 
 config X86_UP_APIC