lkml.org 
[lkml]   [2019]   [Jul]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3 1/2] cputime: remove duplicate code in account_process_tick
Date
The irqtime_account_process_tick path was introduced for precise ns irq
time account from commit abb74cefa9c6 ("sched: Export ns irqtimes
through /proc/stat") while account_process_tick still use jiffes. This
divide isn't necessary especially now both paths are ns precison.

Move out the irqtime_account_process_tick func from IRQ_TIME_ACCOUNTING.
So it do generally same things as account_process_tick whenever if
IRQ_TIME_ACCOUNTING set or if sched_clock_irqtime enabled.

Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
---
kernel/sched/cputime.c | 25 ++-----------------------
1 file changed, 2 insertions(+), 23 deletions(-)

diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index 2305ce89a26c..5086b24d7bee 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -332,7 +332,6 @@ void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times)
rcu_read_unlock();
}

-#ifdef CONFIG_IRQ_TIME_ACCOUNTING
/*
* Account a tick to a process and cpustat
* @p: the process that the CPU time gets accounted to
@@ -390,6 +389,7 @@ static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
}
}

+#ifdef CONFIG_IRQ_TIME_ACCOUNTING
static void irqtime_account_idle_ticks(int ticks)
{
struct rq *rq = this_rq();
@@ -398,8 +398,6 @@ static void irqtime_account_idle_ticks(int ticks)
}
#else /* CONFIG_IRQ_TIME_ACCOUNTING */
static inline void irqtime_account_idle_ticks(int ticks) { }
-static inline void irqtime_account_process_tick(struct task_struct *p, int user_tick,
- struct rq *rq, int nr_ticks) { }
#endif /* CONFIG_IRQ_TIME_ACCOUNTING */

/*
@@ -474,31 +472,12 @@ void thread_group_cputime_adjusted(struct task_struct *p, u64 *ut, u64 *st)
*/
void account_process_tick(struct task_struct *p, int user_tick)
{
- u64 cputime, steal;
struct rq *rq = this_rq();

if (vtime_accounting_cpu_enabled())
return;

- if (sched_clock_irqtime) {
- irqtime_account_process_tick(p, user_tick, rq, 1);
- return;
- }
-
- cputime = TICK_NSEC;
- steal = steal_account_process_time(ULONG_MAX);
-
- if (steal >= cputime)
- return;
-
- cputime -= steal;
-
- if (user_tick)
- account_user_time(p, cputime);
- else if ((p != rq->idle) || (irq_count() != HARDIRQ_OFFSET))
- account_system_time(p, HARDIRQ_OFFSET, cputime);
- else
- account_idle_time(cputime);
+ irqtime_account_process_tick(p, user_tick, rq, 1);
}

/*
--
2.19.1.856.g8858448bb
\
 
 \ /
  Last update: 2019-07-22 09:39    [W:0.046 / U:1.512 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site