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sched/cputime: Allow accounting system time using cpustat index

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In order to prepare for CONFIG_VIRT_CPU_ACCOUNTING_NATIVE=y to delay
cputime accounting to the tick, let's provide APIs to account system
time to precise contexts: hardirq, softirq, pure system, ...

Inspired-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Link: http://lkml.kernel.org/r/1483636310-6557-4-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Frederic Weisbecker 2017-01-05 18:11:43 +01:00 committed by Ingo Molnar
parent 8388d21468
commit c31cc6a518
2 changed files with 7 additions and 5 deletions
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2
include/linux/kernel_stat.h
View File

@ -80,6 +80,8 @@ static inline unsigned int kstat_cpu_irqs_sum(unsigned int cpu)
extern void account_user_time(struct task_struct *, cputime_t);
extern void account_system_time(struct task_struct *, int, cputime_t);
extern void account_system_index_time(struct task_struct *, cputime_t,
enum cpu_usage_stat);
extern void account_steal_time(cputime_t);
extern void account_idle_time(cputime_t);

10
kernel/sched/cputime.c
View File

@ -176,8 +176,8 @@ static void account_guest_time(struct task_struct *p, cputime_t cputime)
* @cputime: the cpu time spent in kernel space since the last update
* @index: pointer to cpustat field that has to be updated
*/
static inline
void __account_system_time(struct task_struct *p, cputime_t cputime, int index)
void account_system_index_time(struct task_struct *p,
cputime_t cputime, enum cpu_usage_stat index)
{
/* Add system time to process. */
p->stime += cputime;
@ -213,7 +213,7 @@ void account_system_time(struct task_struct *p, int hardirq_offset,
else
index = CPUTIME_SYSTEM;
__account_system_time(p, cputime, index);
account_system_index_time(p, cputime, index);
}
/*
@ -400,7 +400,7 @@ 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_index_time(p, cputime, CPUTIME_SOFTIRQ);
} else if (user_tick) {
account_user_time(p, cputime);
} else if (p == rq->idle) {
@ -408,7 +408,7 @@ static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
} else if (p->flags & PF_VCPU) { /* System time or guest time */
account_guest_time(p, cputime);
} else {
__account_system_time(p, cputime, CPUTIME_SYSTEM);
account_system_index_time(p, cputime, CPUTIME_SYSTEM);
}
}