From mboxrd@z Thu Jan 1 00:00:00 1970 From: mathieu.desnoyers@efficios.com (Mathieu Desnoyers) Date: Thu, 29 Sep 2011 13:52:16 -0400 Subject: [ltt-dev] [PATCH 5/7] urcu, call_rcu: avoid create call_rcu_data for child when unneed In-Reply-To: <20110929172721.GB2362@linux.vnet.ibm.com> References: <061a717cef1fd918d0a2a95b142e51a2c5a85ff5.1317198301.git.laijs@cn.fujitsu.com> <20110929172721.GB2362@linux.vnet.ibm.com> Message-ID: <20110929175216.GA7066@Krystal> * Paul E. McKenney (paulmck at linux.vnet.ibm.com) wrote: > On Wed, Sep 28, 2011 at 04:34:31PM +0800, Lai Jiangshan wrote: > > Signed-off-by: Lai Jiangshan > > Nice optimization!!! > > Reviewed-by: Paul E. McKenney Merged, Thanks for both of you for the patch and review. Mathieu > > > --- > > urcu-call-rcu-impl.h | 4 ++++ > > 1 files changed, 4 insertions(+), 0 deletions(-) > > > > diff --git a/urcu-call-rcu-impl.h b/urcu-call-rcu-impl.h > > index 87d9157..65c1c7a 100644 > > --- a/urcu-call-rcu-impl.h > > +++ b/urcu-call-rcu-impl.h > > @@ -675,6 +675,10 @@ void call_rcu_after_fork_child(void) > > /* Release the mutex. */ > > call_rcu_unlock(&call_rcu_mutex); > > > > + /* Do nothing when call_rcu() has not been used */ > > + if (cds_list_empty(&call_rcu_data_list)) > > + return; > > + > > /* > > * Allocate a new default call_rcu_data structure in order > > * to get a working call_rcu thread to go with it. > > -- > > 1.7.4.4 > > -- Mathieu Desnoyers Operating System Efficiency R&D Consultant EfficiOS Inc. http://www.efficios.com