linux-kernel - Re: [PATCH v2 03/14] perf: Add persistent event facilities

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Message-ID: <20130625074401.GY28407@twins.programming.kicks-ass.net>
Date:	Tue, 25 Jun 2013 09:44:01 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Robert Richter <rric@...nel.org>, Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
	Borislav Petkov <bp@...e.de>,
	Robert Richter <robert.richter@...aro.org>
Subject: Re: [PATCH v2 03/14] perf: Add persistent event facilities

On Mon, Jun 24, 2013 at 09:26:16PM +0200, Borislav Petkov wrote:
> On Mon, Jun 24, 2013 at 11:48:30AM +0200, Peter Zijlstra wrote:
> > On Tue, Jun 11, 2013 at 06:42:29PM +0200, Robert Richter wrote:
> > > +int perf_add_persistent_event_by_id(int id)
> > > +{
> > > +	struct perf_event_attr *attr;
> > > +
> > > +	attr = kzalloc(sizeof(*attr), GFP_KERNEL);
> > > +	if (!attr)
> > > +		return -ENOMEM;
> > > +
> > > +	attr->sample_period	= 1;
> > > +	attr->wakeup_events	= 1;
> > > +	attr->sample_type	= PERF_SAMPLE_RAW;
> > > +	attr->persistent	= 1;
> > > +	attr->config		= id;
> > > +	attr->type		= PERF_TYPE_TRACEPOINT;
> > > +	attr->size		= sizeof(*attr);
> > > +
> > > +	return perf_add_persistent_event(attr, CPU_BUFFER_NR_PAGES);
> > > +}
> > 
> > I would call this what it is: perf_add_persistent_tracepoint(), or so
> > :-)
> 
> While we're at it, can we agree on a shortened variant for "persistent"
> - it is too much to type and makes function names uglily¹ long.

Elsewhere in this series you use 'pers' to shorten things; it reads a
bit odd to me because 'pers' is the Dutch word for press (both meanings
transfer) but that is just something I'll have to live with isn't it ;-)

As for tracepoint, it seems common to shorten that to tp; which always
reminds me of toilet paper, but I suppose more people suffer from that.

Yielding: perf_add_pers_tp() 

which I read as adding pressed toilet paper.. a well :-)
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