Commit-ID: 971e8a985482c76487edb5a49811e99b96e846e1 Gitweb: http://git.kernel.org/tip/971e8a985482c76487edb5a49811e99b96e846e1 Author: Jason Low <[email protected]> AuthorDate: Tue, 28 Apr 2015 13:00:23 -0700 Committer: Ingo Molnar <[email protected]> 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 <[email protected]> Signed-off-by: Jason Low <[email protected]> Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Acked-by: Thomas Gleixner <[email protected]> Acked-by: Rik van Riel <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Aswin Chandramouleeswaran <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Davidlohr Bueso <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: H. Peter Anvin <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Mel Gorman <[email protected]> Cc: Mike Galbraith <[email protected]> Cc: Oleg Nesterov <[email protected]> Cc: Paul E. McKenney <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Preeti U Murthy <[email protected]> Cc: Scott J Norton <[email protected]> Cc: Steven Rostedt <[email protected]> Cc: Waiman Long <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
