linux-kernel - Re: [PATCH] perf tool: report user-friendly error from timechart

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Date:	Thu, 03 Oct 2013 11:22:26 -0600
From:	David Ahern <dsahern@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
CC:	Ingo Molnar <mingo@...nel.org>,
	Ramkumar Ramachandra <artagnon@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH] perf tool: report user-friendly error from timechart

On 10/3/13 11:08 AM, Arnaldo Carvalho de Melo wrote:

> And is_valid_tracepoint() is a too big hammer, it traverses the whole
> directory looking for a match instead of plain build the path and do an
> access, its one of those things I need to ditch at some point. So far I
> just try to do a perf_evlist__add_newtp and if it fails, look at errno.

And a number of tracepoints depend on CONFIG settings so it is more than 
just looking at whether debugfs is mounted and accessible/readable. 
e.g., look at the message I put into perf-lock

David

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