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Message-Id: <1435157880-22925-2-git-send-email-riel@redhat.com>
Date: Wed, 24 Jun 2015 10:57:50 -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 01/11] nohz,time: make account_process_tick work on the task's CPU
From: Rik van Riel <riel@...hat.com>
Teach account_process_tick to work on the CPU of the task
specified in the function argument. This allows us to do
remote tick based sampling of a nohz_full cpu from a
housekeeping CPU.
Signed-off-by: Rik van Riel <riel@...hat.com>
---
kernel/sched/cputime.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index 8394b1ee600c..97077c282626 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -463,8 +463,14 @@ void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime
void account_process_tick(struct task_struct *p, int user_tick)
{
cputime_t one_jiffy_scaled = cputime_to_scaled(cputime_one_jiffy);
- struct rq *rq = this_rq();
+ int cpu = task_cpu(p);
+ struct rq *rq = cpu_rq(cpu);
+ /*
+ * Tests current CPU, not "cpu", to see whether account_process_tick()
+ * should do work on this invocation, or whether time keeping for
+ * this CPU is done in some other way.
+ */
if (vtime_accounting_enabled())
return;
--
2.1.0
--
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