lkml.org 
[lkml]   [2014]   [Jul]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: TIF_NOHZ can escape nonhz mask? (Was: [PATCH v3 6/8] x86: Split syscall_trace_enter into two phases)
From
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 :)


\
 
 \ /
  Last update: 2014-07-31 21:21    [W:0.131 / U:0.928 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site