linux-kernel - [PATCH 15/25] sched/vtime: Introduce vtime_accounting_enabled

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Message-Id: <1542163569-20047-16-git-send-email-frederic@kernel.org>
Date:   Wed, 14 Nov 2018 03:45:59 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Wanpeng Li <wanpengli@...cent.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Yauheni Kaliuta <yauheni.kaliuta@...hat.com>,
        Ingo Molnar <mingo@...nel.org>, Rik van Riel <riel@...hat.com>
Subject: [PATCH 15/25] sched/vtime: Introduce vtime_accounting_enabled_cpu()

This allows us to check if a remote CPU runs vtime accounting
(ie: is nohz_full). We'll need that to reliably support "nice"
accounting on kcpustat.

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
Cc: Yauheni Kaliuta <yauheni.kaliuta@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Rik van Riel <riel@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Wanpeng Li <wanpengli@...cent.com>
Cc: Ingo Molnar <mingo@...nel.org>
---
 include/linux/vtime.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/vtime.h b/include/linux/vtime.h
index 82fed7a..a53f6ea 100644
--- a/include/linux/vtime.h
+++ b/include/linux/vtime.h
@@ -31,6 +31,16 @@ static inline bool vtime_accounting_enabled(void)
 	return context_tracking_enabled();
 }
 
+static inline bool vtime_accounting_enabled_cpu(int cpu)
+{
+	if (vtime_accounting_enabled()) {
+		if (context_tracking_enabled_cpu(cpu))
+			return true;
+	}
+
+	return false;
+}
+
 static inline bool vtime_accounting_enabled_this_cpu(void)
 {
 	if (vtime_accounting_enabled()) {
@@ -51,6 +61,7 @@ static inline void vtime_task_switch(struct task_struct *prev)
 
 #else /* !CONFIG_VIRT_CPU_ACCOUNTING */
 
+static inline bool vtime_accounting_enabled_cpu(int cpu) {return false; }
 static inline bool vtime_accounting_enabled_this_cpu(void) { return false; }
 static inline void vtime_task_switch(struct task_struct *prev) { }
 
-- 
2.7.4