On Tue, Sep 06, 2016 at 09:01:29PM +0200, Peter Zijlstra wrote: > > diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c > > index 39008d7..a2d753b 100644 > > --- a/kernel/time/posix-cpu-timers.c > > +++ b/kernel/time/posix-cpu-timers.c > > @@ -848,7 +848,7 @@ static void check_thread_timers(struct task_struct *tsk, > > tsk_expires->virt_exp = expires_to_cputime(expires); > > > > tsk_expires->sched_exp = check_timers_list(++timers, firing, > > - tsk->se.sum_exec_runtime); > > + read_sum_exec_runtime(tsk)); > > > > /* > > * Check for the special case thread timers. > > @tsk == current and IRQs are disabled, sum_exec_runtime cannot be > updated. > > > @@ -1115,7 +1115,7 @@ static inline int fastpath_timer_check(struct > > task_struct *tsk) > > struct task_cputime task_sample; > > > > task_cputime(tsk, &task_sample.utime, &task_sample.stime); > > - task_sample.sum_exec_runtime = tsk->se.sum_exec_runtime; > > + task_sample.sum_exec_runtime = read_sum_exec_runtime(tsk); > > if (task_cputime_expired(&task_sample, &tsk->cputime_expires)) > > return 1; > > } > > Same.
Sorry, I forgot syscalls, those can muck with update_curr() remotely. So yes, those are needed.
