[PATCH 22/36] cputime: Push time to account_user_time() in nsecs
From: Frederic Weisbecker
Date: Thu Nov 17 2016 - 13:09:46 EST
This is one more step toward converting cputime accounting to pure nsecs.
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
Cc: Wanpeng Li <wanpeng.li@xxxxxxxxxxx>
Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
---
arch/ia64/kernel/time.c | 5 +++--
arch/powerpc/kernel/time.c | 2 +-
arch/s390/kernel/vtime.c | 2 +-
include/linux/kernel_stat.h | 2 +-
kernel/sched/cputime.c | 42 ++++++++++++++++++++++++------------------
5 files changed, 30 insertions(+), 23 deletions(-)
diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c
index 021f44a..ce6bf09 100644
--- a/arch/ia64/kernel/time.c
+++ b/arch/ia64/kernel/time.c
@@ -63,11 +63,12 @@ extern cputime_t cycle_to_cputime(u64 cyc);
void vtime_account_user(struct task_struct *tsk)
{
- cputime_t delta_utime;
+ u64 delta_utime;
struct thread_info *ti = task_thread_info(tsk);
if (ti->ac_utime) {
- delta_utime = cycle_to_cputime(ti->ac_utime);
+ /* TODO: cycle_to_ns */
+ delta_utime = cputime_to_nsecs(cycle_to_cputime(ti->ac_utime));
account_user_time(tsk, delta_utime);
ti->ac_utime = 0;
}
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 19361fb..9b372b1 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -392,7 +392,7 @@ void vtime_account_user(struct task_struct *tsk)
acct->user_time = 0;
acct->user_time_scaled = 0;
acct->utime_sspurr = 0;
- account_user_time(tsk, utime);
+ account_user_time(tsk, cputime_to_nsecs(utime));
tsk->utimescaled += cputime_to_nsecs(utimescaled);
}
diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
index 4905e8c..0ac0d4c 100644
--- a/arch/s390/kernel/vtime.c
+++ b/arch/s390/kernel/vtime.c
@@ -137,7 +137,7 @@ static int do_account_vtime(struct task_struct *tsk, int hardirq_offset)
user_scaled = (user_scaled * mult) / div;
system_scaled = (system_scaled * mult) / div;
}
- account_user_time(tsk, user);
+ account_user_time(tsk, cputime_to_nsecs(user));
tsk->utimescaled += cputime_to_nsecs(user_scaled);
account_system_time(tsk, hardirq_offset, system);
tsk->stimescaled += cputime_to_nsecs(system_scaled);
diff --git a/include/linux/kernel_stat.h b/include/linux/kernel_stat.h
index 00f7768..6831734 100644
--- a/include/linux/kernel_stat.h
+++ b/include/linux/kernel_stat.h
@@ -78,7 +78,7 @@ static inline unsigned int kstat_cpu_irqs_sum(unsigned int cpu)
return kstat_cpu(cpu).irqs_sum;
}
-extern void account_user_time(struct task_struct *, cputime_t);
+extern void account_user_time(struct task_struct *, u64);
extern void account_system_time(struct task_struct *, int, cputime_t);
extern void account_steal_time(cputime_t);
extern void account_idle_time(cputime_t);
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index 31c457f..f5318d9 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -116,18 +116,18 @@ static inline void task_group_account_field(struct task_struct *p, int index,
* @p: the process that the cpu time gets accounted to
* @cputime: the cpu time spent in user space since the last update
*/
-void account_user_time(struct task_struct *p, cputime_t cputime)
+void account_user_time(struct task_struct *p, u64 cputime)
{
int index;
/* Add user time to process. */
- p->utime += cputime_to_nsecs(cputime);
- account_group_user_time(p, cputime_to_nsecs(cputime));
+ p->utime += cputime;
+ account_group_user_time(p, cputime);
index = (task_nice(p) > 0) ? CPUTIME_NICE : CPUTIME_USER;
/* Add user time to cpustat. */
- task_group_account_field(p, index, cputime_to_nsecs(cputime));
+ task_group_account_field(p, index, cputime);
/* Account for user time used */
acct_account_cputime(p);
@@ -363,8 +363,9 @@ void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times)
static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
struct rq *rq, int ticks)
{
- u64 cputime = (__force u64) cputime_one_jiffy * ticks;
+ u64 old_cputime = (__force u64) cputime_one_jiffy * ticks;
cputime_t other;
+ u64 cputime;
/*
* When returning from idle, many ticks can get accounted at
@@ -374,9 +375,11 @@ static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
* other time can exceed ticks occasionally.
*/
other = account_other_time(ULONG_MAX);
- if (other >= cputime)
+ if (other >= old_cputime)
return;
- cputime -= other;
+
+ old_cputime -= other;
+ cputime = cputime_to_nsecs(old_cputime);
if (this_cpu_ksoftirqd() == p) {
/*
@@ -384,15 +387,16 @@ static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
* So, we have to handle it separately here.
* Also, p->stime needs to be updated for ksoftirqd.
*/
- __account_system_time(p, cputime, CPUTIME_SOFTIRQ);
+ __account_system_time(p, old_cputime, CPUTIME_SOFTIRQ);
} else if (user_tick) {
account_user_time(p, cputime);
} else if (p == rq->idle) {
- account_idle_time(cputime);
+ account_idle_time(old_cputime);
} else if (p->flags & PF_VCPU) { /* System time or guest time */
- account_guest_time(p, cputime);
+
+ account_guest_time(p, old_cputime);
} else {
- __account_system_time(p, cputime, CPUTIME_SYSTEM);
+ __account_system_time(p, old_cputime, CPUTIME_SYSTEM);
}
}
@@ -475,7 +479,8 @@ void thread_group_cputime_adjusted(struct task_struct *p, u64 *ut, u64 *st)
*/
void account_process_tick(struct task_struct *p, int user_tick)
{
- cputime_t cputime, steal;
+ cputime_t old_cputime, steal;
+ u64 cputime;
struct rq *rq = this_rq();
if (vtime_accounting_cpu_enabled())
@@ -486,20 +491,21 @@ void account_process_tick(struct task_struct *p, int user_tick)
return;
}
- cputime = cputime_one_jiffy;
+ old_cputime = cputime_one_jiffy;
steal = steal_account_process_time(ULONG_MAX);
- if (steal >= cputime)
+ if (steal >= old_cputime)
return;
- cputime -= steal;
+ old_cputime -= steal;
+ cputime = cputime_to_nsecs(old_cputime);
if (user_tick)
account_user_time(p, cputime);
else if ((p != rq->idle) || (irq_count() != HARDIRQ_OFFSET))
- account_system_time(p, HARDIRQ_OFFSET, cputime);
+ account_system_time(p, HARDIRQ_OFFSET, old_cputime);
else
- account_idle_time(cputime);
+ account_idle_time(old_cputime);
}
/*
@@ -738,7 +744,7 @@ void vtime_account_user(struct task_struct *tsk)
tsk->vtime_snap_whence = VTIME_SYS;
if (vtime_delta(tsk)) {
delta_cpu = get_vtime_delta(tsk);
- account_user_time(tsk, delta_cpu);
+ account_user_time(tsk, cputime_to_nsecs(delta_cpu));
}
write_seqcount_end(&tsk->vtime_seqcount);
}
--
2.7.4