linux-kernel - Re: [PATCH v3 tip/core/rcu 1/9] rcu: Add call_rcu

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Date:	Mon, 4 Aug 2014 09:28:45 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	<peterz@...radead.org>
CC:	<linux-kernel@...r.kernel.org>, <mingo@...nel.org>,
	<dipankar@...ibm.com>, <akpm@...ux-foundation.org>,
	<mathieu.desnoyers@...icios.com>, <josh@...htriplett.org>,
	<tglx@...utronix.de>, <rostedt@...dmis.org>, <dhowells@...hat.com>,
	<edumazet@...gle.com>, <dvhart@...ux.intel.com>,
	<fweisbec@...il.com>, <oleg@...hat.com>, <bobby.prani@...il.com>
Subject: Re: [PATCH v3 tip/core/rcu 1/9] rcu: Add call_rcu_tasks()

On 08/01/2014 05:55 AM, Paul E. McKenney wrote:
> +		rcu_read_lock();
> +		for_each_process_thread(g, t) {
> +			if (t != current && ACCESS_ONCE(t->on_rq) &&
> +			    !is_idle_task(t)) {
> +				get_task_struct(t);
> +				t->rcu_tasks_nvcsw = ACCESS_ONCE(t->nvcsw);
> +				ACCESS_ONCE(t->rcu_tasks_holdout) = 1;
> +				list_add(&t->rcu_tasks_holdout_list,
> +					 &rcu_tasks_holdouts);

This loop will collect all the runnable tasks.  It is too much tasks.
Is it possible to collect only on_cpu tasks or PREEMPT_ACTIVE tasks?
It seems hard to achieve it.
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