Messages in this thread | | | Date | Tue, 1 Aug 2017 06:23:09 -0700 | From | "Paul E. McKenney" <> | Subject | Re: [RFC PATCH v2] membarrier: expedited private command |
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On Tue, Aug 01, 2017 at 12:22:03PM +0200, Peter Zijlstra wrote:
[ . . . ]
> As to scheduler IPIs, those are limited to the CPUs the user is limited > to and are rate limited by the wakeup-latency of the tasks. After all, > all the time a task is runnable but not running, wakeups are no-ops.
Can't that wakeup-latency limitation be overcome by a normal user simply by having lots of tasks to wake up, which then go back to sleep almost immediately? Coupled with very a low-priority CPU-bound task on each CPU?
Thanx, Paul
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