linux-kernel - Re: [PATCH -tip] perf_counter tools: shorten names for events

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Message-ID: <20090705002536.GA28060@kryten>
Date:	Sun, 5 Jul 2009 10:25:36 +1000
From:	Anton Blanchard <anton@...ba.org>
To:	Roland Dreier <rdreier@...co.com>
Cc:	Jaswinder Singh Rajput <jaswinder@...nel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -tip] perf_counter tools: shorten names for events


Hi,

> IMHO "L1d" is too abbreviated for it to be obvious that it means L1 data
> cache.  If you want something really short maybe "L1-d$" might be a
> little clearer, but I stil like "L1-dcache" best.

There's one problem with L1-d$-* for event names. It took me a few goes
before I realised I was being hit by bash variable expansion:


#  perf stat -e L1-d$-loads ls

 usage: perf stat [<options>] <command>

...


# perf stat -e 'L1-d$-loads' ls

 Performance counter stats for 'ls':

        1273291  L1-d$-loads             

    0.004434037  seconds time elapsed


I also prefer the more verbose L1-dcache-* names, and since we support
aliases its mostly a matter of screen real estate when printing out the
statistics.

Anton
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