linux-kernel - Re: [PATCH 2/3] sched: enforce per-cpu utilization limits on runtime balancing

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Date:	Thu, 25 Feb 2010 21:28:24 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Fabio Checconi <fchecconi@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Paul Turner <pjt@...gle.com>,
	Dario Faggioli <faggioli@...dalf.sssup.it>,
	Michael Trimarchi <michael@...dence.eu.com>,
	Dhaval Giani <dhaval@...is.sssup.it>,
	Tommaso Cucinotta <t.cucinotta@...up.it>,
	linux-kernel@...r.kernel.org,
	Fabio Checconi <fabio@...dalf.sssup.it>
Subject: Re: [PATCH 2/3] sched: enforce per-cpu utilization limits on
 runtime balancing

On Tue, 2010-02-23 at 19:56 +0100, Fabio Checconi wrote:
> +static inline void double_spin_lock(raw_spinlock_t *lock1,
> +                                   raw_spinlock_t *lock2)
> +       __acquires(lock1)
> +       __acquires(lock2)
> +{
> +       if (lock1 < lock2) {
> +               raw_spin_lock(lock1);
> +               raw_spin_lock_nested(lock2, SINGLE_DEPTH_NESTING);
> +       } else {
> +               raw_spin_lock(lock2);
> +               raw_spin_lock_nested(lock1, SINGLE_DEPTH_NESTING);
> +       }
> +}
> +
> +static inline void double_spin_unlock(raw_spinlock_t *lock1,
> +                                     raw_spinlock_t *lock2)
> +       __releases(lock1)
> +       __releases(lock2)
> +{
> +       raw_spin_unlock(lock1);
> +       lock_set_subclass(&lock2->dep_map, 0, _RET_IP_);
> +       raw_spin_unlock(lock2);
> +} 

If you release both there is no need to re-set the subclass.

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