On Tue, Dec 05, 2017 at 05:10:16PM +0000, Patrick Bellasi wrote:
> + if (cfs_rq->nr_running > 0) {
> + util_est = cfs_rq->util_est_runnable;
> + util_est -= task_util_est(p);
> + if (util_est < 0)
> + util_est = 0;
> + cfs_rq->util_est_runnable = util_est;
> + } else {I'm thinking that's an explicit load-store to avoid intermediate values landing in cfs_rq->util_esp_runnable, right? That would need READ_ONCE() / WRITE_ONCE() I think, without that the compiler is free to munge the lot together.
