linux-kernel - [RFC PATCH 04/11] time,nohz: add cpu parameter to steal_account_process

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Message-Id: <1435157880-22925-5-git-send-email-riel@redhat.com>
Date:	Wed, 24 Jun 2015 10:57:53 -0400
From:	riel@...hat.com
To:	linux-kernel@...r.kernel.org
Cc:	fweisbec@...hat.com, peterz@...radead.org, mingo@...nel.org,
	tglx@...utronix.de, luto@...capital.net
Subject: [RFC PATCH 04/11] time,nohz: add cpu parameter to steal_account_process_tick

From: Rik van Riel <riel@...hat.com>

Add a cpu parameter to steal_account_process_tick, so it can
be used to do CPU time accounting for another CPU.

Signed-off-by: Rik van Riel <riel@...hat.com>
---
 kernel/sched/cputime.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index 7df761cd6dfc..9717d86cf2ab 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -254,15 +254,15 @@ void account_idle_time(cputime_t cputime)
 		cpustat[CPUTIME_IDLE] += (__force u64) cputime;
 }
 
-static __always_inline bool steal_account_process_tick(void)
+static __always_inline bool steal_account_process_tick(int cpu)
 {
 #ifdef CONFIG_PARAVIRT
 	if (static_key_false(&paravirt_steal_enabled)) {
 		u64 steal;
 		cputime_t steal_ct;
 
-		steal = paravirt_steal_clock(smp_processor_id());
-		steal -= this_rq()->prev_steal_time;
+		steal = paravirt_steal_clock(cpu);
+		steal -= cpu_rq(cpu)->prev_steal_time;
 
 		/*
 		 * cputime_t may be less precise than nsecs (eg: if it's
@@ -270,7 +270,7 @@ static __always_inline bool steal_account_process_tick(void)
 		 * granularity and account the rest on the next rounds.
 		 */
 		steal_ct = nsecs_to_cputime(steal);
-		this_rq()->prev_steal_time += cputime_to_nsecs(steal_ct);
+		cpu_rq(cpu)->prev_steal_time += cputime_to_nsecs(steal_ct);
 
 		account_steal_time(steal_ct);
 		return steal_ct;
@@ -345,7 +345,7 @@ static void irqtime_account_process_tick(struct task_struct *p, int cpu,
 	u64 cputime = (__force u64) cputime_one_jiffy;
 	u64 *cpustat = kstat->cpustat;
 
-	if (steal_account_process_tick())
+	if (steal_account_process_tick(cpu))
 		return;
 
 	cputime *= ticks;
@@ -483,7 +483,7 @@ void account_process_tick(struct task_struct *p, int user_tick)
 		return;
 	}
 
-	if (steal_account_process_tick())
+	if (steal_account_process_tick(cpu))
 		return;
 
 	if (user_tick)
-- 
2.1.0

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