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Commit 971e8a98 authored by Jason Low's avatar Jason Low Committed by Ingo Molnar
Browse files

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: default avatarIngo Molnar <mingo@kernel.org>
Signed-off-by: default avatarJason Low <jason.low2@hp.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarRik van Riel <riel@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Aswin Chandramouleeswaran <aswin@hp.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Cc: Scott J Norton <scott.norton@hp.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Waiman Long <Waiman.Long@hp.com>
Link: http://lkml.kernel.org/r/1430251224-5764-5-git-send-email-jason.low2@hp.com


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 1018016c

include/linux/sched.h

+17 −0
Original line number Diff line number Diff line
@@ -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