Messages in this thread | | | Date | Sun, 05 Jun 2011 20:58:23 -0700 (PDT) | Subject | Re: [PATCH 2/4] nohz: Split extended quiescent state handling from nohz switch | From | David Miller <> |
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From: Frederic Weisbecker <fweisbec@gmail.com> Date: Mon, 6 Jun 2011 05:10:56 +0200
> It is assumed that rcu won't be used once we switch to tickless > mode and until we restart the tick. However this is not always > true, as in x86-64 where we dereference the idle notifiers after > the tick is stopped. > > To prepare for fixing this, split the tickless mode switching and > RCU extended quiescent state logics. > Make tick_nohz_stop/restart_sched_tick() RCU agnostic but provide > a new pair of APIs tick_nohz_enter/exit_idle() that keep the > old behaviour by handling both the nohz mode and RCU extended > quiescent states, then convert every archs to use these. > > Archs that want to switch to extended QS to some custom points > can do it later by using tick_nohz_stop_sched_tick() and > rcu_enter_nohz() seperately. > > Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: David S. Miller <davem@davemloft.net>
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