linux-kernel - [tip:sched/core] sched, timer: Provide an atomic ' struct task

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Message-ID: <tip-971e8a985482c76487edb5a49811e99b96e846e1@git.kernel.org>
Date:	Fri, 8 May 2015 06:22:54 -0700
From:	tip-bot for Jason Low <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	Waiman.Long@...com, hpa@...or.com, umgwanakikbuti@...il.com,
	dave@...olabs.net, preeti@...ux.vnet.ibm.com, bp@...en8.de,
	oleg@...hat.com, peterz@...radead.org, tglx@...utronix.de,
	fweisbec@...il.com, jason.low2@...com, akpm@...ux-foundation.org,
	mingo@...nel.org, paulmck@...ux.vnet.ibm.com, mgorman@...e.de,
	scott.norton@...com, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, riel@...hat.com,
	rostedt@...dmis.org, aswin@...com
Subject: [tip:sched/core] sched, timer: Provide an atomic '
 struct task_cputime' data structure

Commit-ID:  971e8a985482c76487edb5a49811e99b96e846e1
Gitweb:     http://git.kernel.org/tip/971e8a985482c76487edb5a49811e99b96e846e1
Author:     Jason Low <jason.low2@...com>
AuthorDate: Tue, 28 Apr 2015 13:00:23 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 8 May 2015 12:17:45 +0200

sched, timer: Provide an atomic 'struct task_cputime' data structure

This patch adds an atomic variant of the 'struct task_cputime' data structure,
which can be used to store and update task_cputime statistics without
needing to do locking.

Suggested-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Jason Low <jason.low2@...com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Rik van Riel <riel@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Aswin Chandramouleeswaran <aswin@...com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Davidlohr Bueso <dave@...olabs.net>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Mike Galbraith <umgwanakikbuti@...il.com>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Preeti U Murthy <preeti@...ux.vnet.ibm.com>
Cc: Scott J Norton <scott.norton@...com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Waiman Long <Waiman.Long@...com>
Link: http://lkml.kernel.org/r/1430251224-5764-5-git-send-email-jason.low2@hp.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 include/linux/sched.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index a45874c..6eb78cd 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -572,6 +572,23 @@ struct task_cputime {
 		.sum_exec_runtime = 0,				\
 	}
 
+/*
+ * This is the atomic variant of task_cputime, which can be used for
+ * storing and updating task_cputime statistics without locking.
+ */
+struct task_cputime_atomic {
+	atomic64_t utime;
+	atomic64_t stime;
+	atomic64_t sum_exec_runtime;
+};
+
+#define INIT_CPUTIME_ATOMIC \
+	(struct task_cputime_atomic) {				\
+		.utime = ATOMIC64_INIT(0),			\
+		.stime = ATOMIC64_INIT(0),			\
+		.sum_exec_runtime = ATOMIC64_INIT(0),		\
+	}
+
 #ifdef CONFIG_PREEMPT_COUNT
 #define PREEMPT_DISABLED	(1 + PREEMPT_ENABLED)
 #else
--
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