linux-kernel - Re: [PATCH 2/2] perf, tools: Don't force MetricExprs to lower case

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Date:   Mon, 9 Oct 2017 08:39:06 -0700
From:   Andi Kleen <andi@...stfloor.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Andi Kleen <andi@...stfloor.org>, Jiri Olsa <jolsa@...nel.org>,
        Wang Nan <wangnan0@...wei.com>, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>, He Kuang <hekuang@...wei.com>,
        Alexei Starovoitov <ast@...com>
Subject: Re: [PATCH 2/2] perf, tools: Don't force MetricExprs to lower case

> > > >   perf stat -e cpu/uops_executed.core/ ls
> > > >   perf stat -e uops_executed.core ls
> > > 
> > > Ok. If it works it's fine for me.
> 
> well it works, but it means that bpf file cannot contains any directory
> part.. which im not sure is ok with bpf folks ;-) anyone?

One way that may work is to 

- switch to a new proper syntax for bpf
(like bpf("filename")) that can be parsed properly

- handle simple cases like just that file name in the old syntax
in a pre processing pass of the scanner that converts it.

- users who specify multiple scripts or combine with other events
in the same -e line would need to change their syntax, but I assume that's
relatively rare.

-Andi