linux-kernel - Re: [PATCH v5 tip/core/rcu 06/16] rcutorture: Add torture tests for RCU-tasks

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Date:	Thu, 14 Aug 2014 17:34:53 -0400
From:	Pranith Kumar <bobby.prani@...il.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.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 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 :)

> +
> +#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
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