linux-kernel - Re: [RFC][PATCH 12/13] stop

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Message-ID: <20150624173205.GK18673@twins.programming.kicks-ass.net>
Date:	Wed, 24 Jun 2015 19:32:05 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Oleg Nesterov <oleg@...hat.com>, tj@...nel.org, mingo@...hat.com,
	linux-kernel@...r.kernel.org, der.herr@...r.at, dave@...olabs.net,
	riel@...hat.com, viro@...IV.linux.org.uk,
	torvalds@...ux-foundation.org
Subject: Re: [RFC][PATCH 12/13] stop_machine: Remove lglock

On Wed, Jun 24, 2015 at 07:28:18PM +0200, Peter Zijlstra wrote:
> +unlock:
> +	/* MCS style queue 'unlock' */
> +	next = READ_ONCE(entry.next);
> +	if (!next) {
> +		if (cmpxchg(&rsp->expedited_queue, &entry, NULL) == &entry)
> +			goto done;
> +		while (!(next = READ_ONCE(entry.next)))
> +			cpu_relax();
> +	}
> +	smp_store_release(&next->done, 1);

Do you suppose:

	wake_up_process(next->task);

would help? :-)

>  
> +done:
>  	put_online_cpus();
>  }
>  EXPORT_SYMBOL_GPL(synchronize_sched_expedited);
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