linux-kernel - Re: [PATCH 05/23] perf tests: Add simple session read/write test

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Date:	Thu, 18 Jul 2013 16:26:41 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	linux-kernel@...r.kernel.org,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andi Kleen <ak@...ux.intel.com>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 05/23] perf tests: Add simple session read/write test

On Wed, Jul 17, 2013 at 04:33:13PM -0300, Arnaldo Carvalho de Melo wrote:

SNIP

> > +
> > +static union perf_event *get_event_MMAP(void)
> > +{
> > +	static union perf_event event;
> > +	size_t size;
> > +
> > +	size = snprintf(event.mmap.filename, sizeof(event.mmap.filename),
> > +			"krava") + 1;
> > +	size = PERF_ALIGN(size, sizeof(u64));
> > +
> > +	event.header.type = PERF_RECORD_MMAP;
> > +	event.header.misc = PERF_RECORD_MISC_KERNEL;
> > +	event.header.size = sizeof(event.mmap) -
> > +			    (sizeof(event.mmap.filename) - size);
> > +
> > +	event.mmap.pgoff = 10;
> > +	event.mmap.start = 0;
> > +	event.mmap.len   = 10;
> > +	event.mmap.pid   = 123;
> > +
> > +	return &event;
> > +}
> 
> Don't use statics, here perhaps we can have another general purpose
> helper:
> 
> 	void perf_event__init_mmap(union perf_event *event)

well, the thing is that it makes the test simple, I can use it like:

	TEST_ASSERT_VAL("failed to store MMAP event",
			!store_event(fd, get_event_MMAP(), &size));

no need to call extra functions, just get the single event

jirka
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