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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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