Messages in this thread | | | Date | Thu, 31 Jul 2014 20:50:29 +0200 | Subject | Re: TIF_NOHZ can escape nonhz mask? (Was: [PATCH v3 6/8] x86: Split syscall_trace_enter into two phases) | From | Frederic Weisbecker <> |
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2014-07-31 20:47 GMT+02:00 Frederic Weisbecker <fweisbec@gmail.com>: > On Thu, Jul 31, 2014 at 08:12:30PM +0200, Oleg Nesterov wrote: >> On 07/31, Frederic Weisbecker wrote: > No, because preempt_schedule_irq() does the ctx_state save and restore with > exception_enter/exception_exit.
Similar thing happens with schedule_user().
preempt_schedule_irq() handles kernel preemption and schedule_user() the user preemption. On both cases we save and restore the context tracking state.
This might be the missing piece you were missing :)
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