linux-kernel - Re: [PATCH 5/5] perf tools: Enhance parsing events tracepoint error output

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Message-ID: <20150911202222.GV23511@kernel.org>
Date:	Fri, 11 Sep 2015 17:22:22 -0300
From:	Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:	Raphaël Beamonte <raphael.beamonte@...il.com>
Cc:	Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Matt Fleming <matt@...eblueprint.co.uk>
Subject: Re: [PATCH 5/5] perf tools: Enhance parsing events tracepoint error
 output

Em Fri, Sep 11, 2015 at 03:56:44PM -0400, Raphaël Beamonte escreveu:
> Another possibility would be to have another perf command, sort of a
> "perf remountfs", to run with sudo and that would make itself both
> checks and remount accordingly the two fs.

This part maybe more interesting, so I'll focus on it, yeah, having a:
'perf fixperms' command (have a better name? :) ) may make sense, would
need context tho, i.e. something like:

  perf fixperms trace

Or:

  perf fixperms top

But then, perhaps in that case:

  $ trace ls
  Error:	No permissions to read
  /sys/kernel/debug/tracing/events/raw_syscalls/sys_(enter|exit)
  Hint:	Try 'sudo mount -o remount,mode=755 /sys/kernel/debug'

We could just add some more text saying that please check as well that
the other parts of the path we're trying to access are available once
the suggestion is followed.

- Arnaldo

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