linux-kernel - Re: [PATCH v2 08/11] powerpc/perf: add support for the hv gpci (get performance counter info) interface

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Date:	Tue, 25 Feb 2014 14:33:29 +1100 (EST)
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Cody P Schafer <cody@...ux.vnet.ibm.com>,
	Linux PPC <linuxppc-dev@...ts.ozlabs.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Ingo Molnar <mingo@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH v2 08/11] powerpc/perf: add support for the hv gpci (get performance counter info) interface

On Fri, 2014-14-02 at 22:02:12 UTC, Cody P Schafer wrote:
> This provides a basic link between perf and hv_gpci. Notably, it does
> not yet support transactions and does not list any events (they can
> still be manually composed).

Can you explain how the HV_CAPS stuff ends up looking.

I'm not against adding it, but I'd like to understand how we expect it to be
used a bit better.

cheers

> diff --git a/arch/powerpc/perf/hv-gpci.c b/arch/powerpc/perf/hv-gpci.c
> new file mode 100644
> index 0000000..1f5d96d
> --- /dev/null
> +++ b/arch/powerpc/perf/hv-gpci.c
> +
> +static struct pmu h_gpci_pmu = {
> +	.task_ctx_nr = perf_invalid_context,
> +
> +	.name = "hv_gpci",
> +	.attr_groups = attr_groups,
> +	.event_init  = h_gpci_event_init,
> +	.add         = h_gpci_event_add,
> +	.del         = h_gpci_event_del,
		     = h_gpci_event_stop,

> +	.start       = h_gpci_event_start,
> +	.stop        = h_gpci_event_stop,
> +	.read        = h_gpci_event_read,
		     = h_gpci_event_update

> +	.event_idx = perf_swevent_event_idx,
> +};


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