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Message-ID: <20140814214950.GA10580@linux.vnet.ibm.com> Date: Thu, 14 Aug 2014 14:49:50 -0700 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: Pranith Kumar <bobby.prani@...il.com> Cc: LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...nel.org>, Lai Jiangshan <laijs@...fujitsu.com>, Dipankar Sarma <dipankar@...ibm.com>, Andrew Morton <akpm@...ux-foundation.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Josh Triplett <josh@...htriplett.org>, Thomas Gleixner <tglx@...utronix.de>, Peter Zijlstra <peterz@...radead.org>, Steven Rostedt <rostedt@...dmis.org>, David Howells <dhowells@...hat.com>, Eric Dumazet <edumazet@...gle.com>, dvhart@...ux.intel.com, Frédéric Weisbecker <fweisbec@...il.com>, Oleg Nesterov <oleg@...hat.com> Subject: Re: [PATCH v5 tip/core/rcu 06/16] rcutorture: Add torture tests for RCU-tasks On Thu, Aug 14, 2014 at 02:44:15PM -0700, Paul E. McKenney wrote: > On Thu, Aug 14, 2014 at 05:34:53PM -0400, Pranith Kumar wrote: > > On Mon, Aug 11, 2014 at 6:48 PM, Paul E. McKenney > > <paulmck@...ux.vnet.ibm.com> wrote: > > > From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> > > > > > > This commit adds torture tests for RCU-tasks. It also fixes a bug that > > > would segfault for an RCU flavor lacking a callback-barrier function. > > > > > > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com> > > > Reviewed-by: Josh Triplett <josh@...htriplett.org> > > > --- > > > include/linux/rcupdate.h | 1 + > > > kernel/rcu/rcutorture.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++- > > > 2 files changed, 50 insertions(+), 1 deletion(-) > > > > > > diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h > > > index e6aea256ad39..f504f797c9c8 100644 > > > --- a/include/linux/rcupdate.h > > > +++ b/include/linux/rcupdate.h > > > @@ -55,6 +55,7 @@ enum rcutorture_type { > > > RCU_FLAVOR, > > > RCU_BH_FLAVOR, > > > RCU_SCHED_FLAVOR, > > > + RCU_TASKS_FLAVOR, > > > SRCU_FLAVOR, > > > INVALID_RCU_FLAVOR > > > }; > > > diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c > > > index febe07062ac5..52423f2c74da 100644 > > > --- a/kernel/rcu/rcutorture.c > > > +++ b/kernel/rcu/rcutorture.c > > > @@ -601,6 +601,52 @@ static struct rcu_torture_ops sched_ops = { > > > .name = "sched" > > > }; > > > > > > +#ifdef CONFIG_TASKS_RCU > > > + > > > +/* > > > + * Definitions for RCU-tasks torture testing. > > > + */ > > > + > > > +static int tasks_torture_read_lock(void) > > > +{ > > > + return 0; > > > +} > > > + > > > +static void tasks_torture_read_unlock(int idx) > > > +{ > > > +} > > > + > > > +static void rcu_tasks_torture_deferred_free(struct rcu_torture *p) > > > +{ > > > + call_rcu_tasks(&p->rtort_rcu, rcu_torture_cb); > > > +} > > > + > > > +static struct rcu_torture_ops tasks_ops = { > > > + .ttype = RCU_TASKS_FLAVOR, > > > + .init = rcu_sync_torture_init, > > > + .readlock = tasks_torture_read_lock, > > > + .read_delay = rcu_read_delay, /* just reuse rcu's version. */ > > > + .readunlock = tasks_torture_read_unlock, > > > + .completed = rcu_no_completed, > > > + .deferred_free = rcu_tasks_torture_deferred_free, > > > + .sync = synchronize_rcu_tasks, > > > + .exp_sync = synchronize_rcu_tasks, > > > + .call = call_rcu_tasks, > > > + .cb_barrier = rcu_barrier_tasks, > > > + .fqs = NULL, > > > + .stats = NULL, > > > + .irq_capable = 1, > > > + .name = "tasks" > > > +}; > > > + > > > +#define RCUTORTURE_TASKS_OPS &tasks_ops, > > > > Not sure about the comma here, no harm but still... a minor nit :) > > Good point, it would be better to parenthesize this an put the comma > at the point of use. Fixed! Except that this gives me a syntax error when CONFIG_TASKS_RCU=n because we end up with a pair of consecutive commas. Nice try, though! ;-) Thanx, Paul > > > + > > > +#else /* #ifdef CONFIG_TASKS_RCU */ > > > + > > > +#define RCUTORTURE_TASKS_OPS > > > + > > > +#endif /* #else #ifdef CONFIG_TASKS_RCU */ > > > + > > > /* > > > * RCU torture priority-boost testing. Runs one real-time thread per > > > * CPU for moderate bursts, repeatedly registering RCU callbacks and > > > @@ -1295,7 +1341,8 @@ static int rcu_torture_barrier_cbs(void *arg) > > > if (atomic_dec_and_test(&barrier_cbs_count)) > > > wake_up(&barrier_wq); > > > } while (!torture_must_stop()); > > > - cur_ops->cb_barrier(); > > > + if (cur_ops->cb_barrier != NULL) > > > + cur_ops->cb_barrier(); > > > destroy_rcu_head_on_stack(&rcu); > > > torture_kthread_stopping("rcu_torture_barrier_cbs"); > > > return 0; > > > @@ -1534,6 +1581,7 @@ rcu_torture_init(void) > > > int firsterr = 0; > > > static struct rcu_torture_ops *torture_ops[] = { > > > &rcu_ops, &rcu_bh_ops, &rcu_busted_ops, &srcu_ops, &sched_ops, > > > + RCUTORTURE_TASKS_OPS > > > }; > > > > > > if (!torture_init_begin(torture_type, verbose, &rcutorture_runnable)) > > > -- > > > 1.8.1.5 > > > > > > > > > > > -- > > Pranith > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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