linux-kernel - [RFC PATCH 09/11] nohz,time: add tick_accounting

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Message-Id: <1435157880-22925-10-git-send-email-riel@redhat.com>
Date:	Wed, 24 Jun 2015 10:57:58 -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 09/11] nohz,time: add tick_accounting_remote macro

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

With the introduction of remote tick based sampling, we now have
three ways of gathering time statistics:
- local tick based sampling
- vtime accounting (used natively on some architectures)
- remote tick based sampling

On a system with remote tick based sampling, the housekeeping
CPUs will still do local tick based sampling. This results in
needing two macros for switching the timekeeping code.

Signed-off-by: Rik van Riel <riel@...hat.com>
---
 include/linux/vtime.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/vtime.h b/include/linux/vtime.h
index 4f5c1a3712e7..a587058c7967 100644
--- a/include/linux/vtime.h
+++ b/include/linux/vtime.h
@@ -17,6 +17,7 @@ struct task_struct;
  */
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
 static inline bool tick_accounting_disabled(void) { return true; }
+static inline bool tick_accounting_remote(void) { return false; }
 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
 
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
@@ -29,10 +30,12 @@ static inline bool tick_accounting_disabled(void)
 
 	return false;
 }
+static inline bool tick_accounting_remote(void) { return true; }
 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */
 
 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
 static inline bool tick_accounting_disabled(void) { return false; }
+static inline bool tick_accounting_remote(void) { return false; }
 #endif /* !CONFIG_VIRT_CPU_ACCOUNTING */
 
 
-- 
2.1.0

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