linux-kernel - Re: Q: perf_install_in_context/perf_event

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Date:	Wed, 26 Jan 2011 20:38:03 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Alan Stern <stern@...land.harvard.edu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Prasad <prasad@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Q: perf_install_in_context/perf_event_enable are racy?

On Wed, 2011-01-26 at 20:33 +0100, Peter Zijlstra wrote:

> Wouldn't something like the below cure things too?

> +struct task_function_call {
> +	struct task_struct *p;
> +	void (*func)(void *info);
> +	void *info;
> +};
> +
> +void task_function_trampoline(void *data)
> +{
> +	struct task_function_call *tfc = data;
> +
> +	if (this_rq()->curr != tfc->p)
> +		return;
> +
> +	tfc->func(tfc->data);
> +}

tfc->info of course ;-)
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