linux-kernel - Re: [PATCH v2] perf: Store active software events in a hashlist

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Date:	Thu, 08 Apr 2010 22:04:41 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH v2] perf: Store active software events in a hashlist

Le jeudi 08 avril 2010 à 21:39 +0200, Frederic Weisbecker a écrit :

...

> @@ -5401,6 +5507,16 @@ static void __cpuinit perf_event_init_cpu(int cpu)
>  	spin_lock(&perf_resource_lock);
>  	cpuctx->max_pertask = perf_max_events - perf_reserved_percpu;
>  	spin_unlock(&perf_resource_lock);
> +
> +	mutex_lock(&cpuctx->hlist_mutex);
> +	if (&cpuctx->hlist_refcount > 0) {


	if (cpuctx->hlist_refcount > 0)

> +		struct swevent_hlist *hlist;
> +
> +		hlist = kzalloc(sizeof(*hlist), GFP_KERNEL);
> +		WARN_ON_ONCE(!hlist);
> +		rcu_assign_pointer(cpuctx->swevent_hlist, hlist);
> +	}
> +	mutex_unlock(&cpuctx->hlist_mutex);
>  }



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