linux-kernel - Re: [RFC V2 PATCH 05/11] cxl/mem: Trace General Media Event Record

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Date:   Sat, 15 Oct 2022 07:30:36 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     ira.weiny@...el.com
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org
Subject: Re: [RFC V2 PATCH 05/11] cxl/mem: Trace General Media Event Record

On Mon, 10 Oct 2022 15:41:25 -0700
ira.weiny@...el.com wrote:

> +static void cxl_trace_event_record(const char *dev_name,
> +				   enum cxl_event_log_type type,
> +				   struct cxl_get_event_payload *payload)
> +{
> +	uuid_t *id = &payload->record.hdr.id;
> +

Perhaps you want to add here:

	if (!trace_cxl_general_media_enabled() && !trace_clx_generic_event_enabled())
		return;

This way the below logic is only executed if either event is enabled.
The above uses static_branches, so if the architecture supports them,
they are not compare and branch, but jumps and/or nops.

-- Steve


> +	if (uuid_equal(id, &gen_media_event_uuid)) {
> +		struct cxl_event_gen_media *rec =
> +				(struct cxl_event_gen_media *)&payload->record;
> +
> +		trace_general_media(dev_name, type, rec);
> +		return;
> +	}
> +
> +	/* For unknown record types print just the header */
> +	trace_generic_event(dev_name, type, &payload->record);
> +}