linux-kernel - Re: [patch 1/4] x86,perf: P4 PMU -- configurate predefined events

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Date:	Sat, 8 May 2010 15:33:46 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	"mingo@...e.hu" <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Lin Ming <ming.m.lin@...el.com>,
	Robert Richter <robert.richter@....com>
Subject: Re: [patch 1/4] x86,perf: P4 PMU -- configurate predefined events

On Saturday, May 8, 2010, Cyrill Gorcunov <gorcunov@...nvz.org> wrote:
> If an event is not RAW we should exit p4_hw_config
> early but call x86_setup_perfctr as well.
>

Actually i meant "should not"

> CC: Peter Zijlstra <peterz@...radead.org>
> CC: Ingo Molnar <mingo@...e.hu>
> CC: Frederic Weisbecker <fweisbec@...il.com>
> CC: Lin Ming <ming.m.lin@...el.com>
> CC: Robert Richter <robert.richter@....com>
> Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
> ---
>
> Robert, if only I'm not missing something this is
> a side effect of commit 9d0fcba67e47ff398a6fa86476d4884d472dc98a,
> wonders why don't we hit it earlier. Am I wrong?
>
>  arch/x86/kernel/cpu/perf_event_p4.c |   29 ++++++++++++++---------------
>  1 file changed, 14 insertions(+), 15 deletions(-)
>
> Index: linux-2.6.git/arch/x86/kernel/cpu/perf_event_p4.c
> =====================================================================
> --- linux-2.6.git.orig/arch/x86/kernel/cpu/perf_event_p4.c
> +++ linux-2.6.git/arch/x86/kernel/cpu/perf_event_p4.c
> @@ -439,21 +439,20 @@ static int p4_hw_config(struct perf_even
>         if (p4_ht_active() && p4_ht_thread(cpu))
>                 event->hw.config = p4_set_ht_bit(event->hw.config);
>
> -       if (event->attr.type != PERF_TYPE_RAW)
> -               return 0;
> -
> -       /*
> -        * We don't control raw events so it's up to the caller
> -        * to pass sane values (and we don't count the thread number
> -        * on HT machine but allow HT-compatible specifics to be
> -        * passed on)
> -        *
> -        * XXX: HT wide things should check perf_paranoid_cpu() &&
> -        *      CAP_SYS_ADMIN
> -        */
> -       event->hw.config |= event->attr.config &
> -               (p4_config_pack_escr(P4_ESCR_MASK_HT) |
> -                p4_config_pack_cccr(P4_CCCR_MASK_HT));
> +       if (event->attr.type == PERF_TYPE_RAW) {
> +               /*
> +                * We don't control raw events so it's up to the caller
> +                * to pass sane values (and we don't count the thread number
> +                * on HT machine but allow HT-compatible specifics to be
> +                * passed on)
> +                *
> +                * XXX: HT wide things should check perf_paranoid_cpu() &&
> +                *      CAP_SYS_ADMIN
> +                */
> +               event->hw.config |= event->attr.config &
> +                       (p4_config_pack_escr(P4_ESCR_MASK_HT) |
> +                        p4_config_pack_cccr(P4_CCCR_MASK_HT));
> +       }
>
>         return x86_setup_perfctr(event);
>  }
>
>
--
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