linux-kernel - Re: [patch] x86, perf_counter, bts: add bts to perf

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Date:	Fri, 07 Aug 2009 13:45:24 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Markus Metzger <markus.t.metzger@...el.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de,
	hpa@...or.com, markus.t.metzger@...il.com, oleg@...hat.com
Subject: Re: [patch] x86, perf_counter, bts: add bts to perf_counter

On Fri, 2009-08-07 at 09:22 +0200, Markus Metzger wrote:
> @@ -721,9 +903,13 @@ static int __hw_perf_counter_init(struct
>         err = 0;
>         if (!atomic_inc_not_zero(&active_counters)) {
>                 mutex_lock(&pmc_reserve_mutex);
> -               if (atomic_read(&active_counters) == 0 && !reserve_pmc_hardware())
> -                       err = -EBUSY;
> -               else
> +               if (atomic_read(&active_counters) == 0) {
> +                       if (!reserve_pmc_hardware())
> +                               err = -EBUSY;
> +                       else
> +                               reserve_bts_hardware();
> +               }
> +               if (!err)
>                         atomic_inc(&active_counters);
>                 mutex_unlock(&pmc_reserve_mutex);
>         }

You loose the reserve_bts_hardware() error case there.

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