Messages in this thread Patch in this message | | | From | Jason Low <> | Subject | [PATCH v2 4/5] sched, timer: Provide an atomic task_cputime data structure | Date | Tue, 28 Apr 2015 13:00:23 -0700 |
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This patch adds an atomic variant of the 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@kernel.org> Signed-off-by: Jason Low <jason.low2@hp.com> --- include/linux/sched.h | 17 +++++++++++++++++ 1 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h index c736a47..7092192 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -575,6 +575,23 @@ 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 -- 1.7.2.5
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