Messages in this thread | | | Date | Thu, 19 Feb 2015 22:26:09 +0100 (CET) | From | Jiri Kosina <> | Subject | Re: [PATCH 1/3] sched: add sched_task_call() |
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On Thu, 19 Feb 2015, Josh Poimboeuf wrote:
> How about with a TIF_IN_USERSPACE thread flag? It could be cleared/set > right at the border. Then for running tasks it's as simple as: > > if (test_tsk_thread_flag(task, TIF_IN_USERSPACE)) > klp_switch_task_universe(task);
That's in principle what CONTEXT_TRACKING is doing, i.e. the condition we'd be interested in would be
__this_cpu_read(context_tracking.state) == IN_USER
But it has overhead.
-- Jiri Kosina SUSE Labs
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