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Date: Thu, 26 Jun 2014 18:16:04 +0900
From: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
To: linux-kernel@...r.kernel.org
CC: Fernando Luis Vazquez Cao <fernando_b1@....ntt.co.jp>,
Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
Frederic Weisbecker <fweisbec@...il.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Arjan van de Ven <arjan@...ux.intel.com>,
Oleg Nesterov <oleg@...hat.com>,
Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
Denys Vlasenko <vda.linux@...glemail.com>
Subject: [PATCH 7/8] cputime: generic iowait accounting for VIRT_CPU_ACCOUNTING
Get iowait's timestamp for accounting w/ VIRT_CPU_ACCOUNTING_GEN.
(currently arm is only user of this?)
At last of this series of changes, introduce common function
vtime_iowait_exit to replace all arch_record_iowait_exit.
Not-tested-by: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
---
arch/ia64/include/asm/cputime.h | 2 --
arch/ia64/kernel/time.c | 2 +-
arch/powerpc/include/asm/cputime.h | 3 ---
arch/powerpc/kernel/time.c | 2 +-
arch/s390/include/asm/cputime.h | 2 --
arch/s390/kernel/vtime.c | 2 +-
include/linux/vtime.h | 3 +++
kernel/sched/core.c | 4 +---
kernel/sched/cputime.c | 25 +++++++++++++++++++++++--
9 files changed, 30 insertions(+), 15 deletions(-)
diff --git a/arch/ia64/include/asm/cputime.h b/arch/ia64/include/asm/cputime.h
index 6089cbd..e2d3f5b 100644
--- a/arch/ia64/include/asm/cputime.h
+++ b/arch/ia64/include/asm/cputime.h
@@ -24,8 +24,6 @@
# include <asm/processor.h>
# include <asm-generic/cputime_nsecs.h>
extern void arch_vtime_task_switch(struct task_struct *tsk);
-extern void ia64_record_iowait_exit(int cpu);
-# define arch_record_iowait_exit(cpu) ia64_record_iowait_exit(cpu)
#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
#endif /* __IA64_CPUTIME_H */
diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c
index 37c907d..4b34346 100644
--- a/arch/ia64/kernel/time.c
+++ b/arch/ia64/kernel/time.c
@@ -143,7 +143,7 @@ EXPORT_SYMBOL_GPL(vtime_account_system);
*/
DEFINE_PER_CPU(u64, ia64_iowait_exit);
-void ia64_record_iowait_exit(int cpu)
+void vtime_iowait_exit(int cpu)
{
/* FIXME: ITC might not synchronized between cpus/sockets */
per_cpu(ia64_iowait_exit, cpu) = ia64_get_itc();
diff --git a/arch/powerpc/include/asm/cputime.h b/arch/powerpc/include/asm/cputime.h
index f33a801..607559a 100644
--- a/arch/powerpc/include/asm/cputime.h
+++ b/arch/powerpc/include/asm/cputime.h
@@ -230,9 +230,6 @@ static inline cputime_t clock_t_to_cputime(const unsigned long clk)
static inline void arch_vtime_task_switch(struct task_struct *tsk) { }
-void ppc_record_iowait_exit(int cpu);
-#define arch_record_iowait_exit(cpu) ppc_record_iowait_exit(cpu)
-
#endif /* __KERNEL__ */
#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
#endif /* __POWERPC_CPUTIME_H */
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 879d97a..7afddc1 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -355,7 +355,7 @@ EXPORT_SYMBOL_GPL(vtime_account_system);
DEFINE_PER_CPU(u64, vtime_iowait_exit);
-void ppc_record_iowait_exit(int cpu)
+void vtime_iowait_exit(int cpu)
{
per_cpu(vtime_iowait_exit, cpu) = mftb();
}
diff --git a/arch/s390/include/asm/cputime.h b/arch/s390/include/asm/cputime.h
index f4f882d..e136328 100644
--- a/arch/s390/include/asm/cputime.h
+++ b/arch/s390/include/asm/cputime.h
@@ -180,10 +180,8 @@ struct s390_idle_data {
DECLARE_PER_CPU(struct s390_idle_data, s390_idle);
void s390_get_idle_and_iowait(int cpu, cputime64_t reti, cputime64_t retw);
-void s390_record_iowait_exit(int cpu);
#define arch_idle_and_iowait(cpu, i, w) s390_get_idle_and_iowait(cpu, i, w)
-#define arch_record_iowait_exit(cpu) s390_save_iowait_exit(cpu)
static inline int s390_nohz_delay(int cpu)
{
diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
index f945cbd..123fa74 100644
--- a/arch/s390/kernel/vtime.c
+++ b/arch/s390/kernel/vtime.c
@@ -214,7 +214,7 @@ void s390_get_idle_and_iowait(int cpu, cputime64_t *reti, cputime64_t *retw)
}
}
-void s390_record_iowait_exit(int cpu)
+void vtime_iowait_exit(int cpu)
{
struct s390_idle_data *idle = &per_cpu(s390_idle, cpu);
diff --git a/include/linux/vtime.h b/include/linux/vtime.h
index c5165fd..7f4632a 100644
--- a/include/linux/vtime.h
+++ b/include/linux/vtime.h
@@ -49,6 +49,7 @@ static inline void vtime_task_switch(struct task_struct *prev)
}
#endif /* __ARCH_HAS_VTIME_TASK_SWITCH */
+extern void vtime_iowait_exit(int cpu);
extern void vtime_account_system(struct task_struct *tsk);
extern void vtime_account_idle(struct task_struct *tsk);
extern void vtime_account_user(struct task_struct *tsk);
@@ -66,8 +67,10 @@ static inline void vtime_account_irq_enter(struct task_struct *tsk)
#else /* !CONFIG_VIRT_CPU_ACCOUNTING */
+static inline void vtime_iowait_exit(int cpu) { }
static inline void vtime_task_switch(struct task_struct *prev) { }
static inline void vtime_account_system(struct task_struct *tsk) { }
+static inline void vtime_account_idle(struct task_struct *tsk) { }
static inline void vtime_account_user(struct task_struct *tsk) { }
static inline void vtime_account_irq_enter(struct task_struct *tsk) { }
#endif /* !CONFIG_VIRT_CPU_ACCOUNTING */
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 52abf79..f8eec61 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4345,9 +4345,7 @@ static inline void iowait_stop(struct rq *rq)
raw_spin_lock(&rq->iowait_lock);
rq->nr_iowait--;
if (!rq->nr_iowait && rq != this_rq()) {
-#ifdef arch_record_iowait_exit
- arch_record_iowait_exit(rq->cpu);
-#endif
+ vtime_iowait_exit(rq->cpu);
rq->last_iowait = ktime_get();
}
raw_spin_unlock(&rq->iowait_lock);
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index 283e011..866a3ff 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -741,11 +741,32 @@ void vtime_guest_exit(struct task_struct *tsk)
}
EXPORT_SYMBOL_GPL(vtime_guest_exit);
+DEFINE_PER_CPU(unsigned long long, vtime_exit_iowait);
+
+void vtime_iowait_exit(int cpu)
+{
+ /* FIXME: don't compare local clock on different cpus */
+ per_cpu(vtime_exit_iowait, cpu) = local_clock();
+}
+
void vtime_account_idle(struct task_struct *tsk)
{
- cputime_t delta_cpu = get_vtime_delta(tsk);
+ unsigned long long now, delta;
+ cputime_t delta_cpu, idle_cpu;
+
+ now = local_clock();
+ if (now < tsk->vtime_snap)
+ return;
+
+ delta = now - tsk->vtime_snap;
+
+ WARN_ON_ONCE(tsk->vtime_snap_whence == VTIME_SLEEPING);
+ tsk->vtime_snap += delta;
+
+ delta_cpu = nsecs_to_cputime(delta);
+ idle_cpu = nsecs_to_cputime(now - per_cpu_var(vtime_exit_iowait));
- account_idle_time(delta_cpu);
+ account_idle_and_iowait(0, delta_cpu - idle_cpu, delta_cpu);
}
void arch_vtime_task_switch(struct task_struct *prev)
--
1.7.1
--
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