linux-kernel - Re: [RFC 2/2] perf: Marker software event and ioctl

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Date:	Fri, 12 Sep 2014 14:58:55 +0100
From:	Pawel Moll <pawel.moll@....com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Christopher Covington <cov@...eaurora.org>,
	Richard Cochran <richardcochran@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Paul Mackerras <paulus@...ba.org>,
	John Stultz <john.stultz@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>
Subject: Re: [RFC 2/2] perf: Marker software event and ioctl

On Fri, 2014-09-12 at 14:49 +0100, Arnaldo Carvalho de Melo wrote:
> Perhaps both? I.e. an u64 followed from a string, if the u64 is zero,
> then there is a string right after it?

How would this look like in userspace? Something like this?

8<----
struct perf_event_marker {
	uint64_t value;
	char *string;
} arg;

arg.value = 0x1234;

/* or */

arg.value = 0;
arg.string = "abcd";

ioctl(fd, PERF_EVENT_IOC_MARKER, &arg)
8<----

If so, maybe it would simpler just to go for classic size/data
structure?

8<-----
struct perf_event_marker {
	uint32_t size;
	void *data;
}
8<-----

This would directly map into struct perf_raw_record...

Paweł

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