linux-kernel - Re: [QUERY] Why does perf-trace need me to be root?

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Date:	Wed, 02 Oct 2013 07:02:28 -0600
From:	David Ahern <dsahern@...il.com>
To:	Ramkumar Ramachandra <artagnon@...il.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [QUERY] Why does perf-trace need me to be root?

On 10/2/13 3:20 AM, Ramkumar Ramachandra wrote:
> Hi,
>
> All the other perf tooling can be used as a normal user. At one point,
> I had to touch /proc/sys/kernel/perf_event_paranoid to get me numbers
> on a PMU event without a symbolic name, but that's about it.
> perf-trace seems to be the exception though:
>
>    artagnon|perf-core=:~/src/linux/tools/perf$ perf trace -a -e open
>    Couldn't read the raw_syscalls tracepoints information!
>
> The responsible codepath is:
>
>    if (perf_evlist__add_newtp(evlist, "raw_syscalls", "sys_enter",
> trace__sys_enter) ||
>       perf_evlist__add_newtp(evlist, "raw_syscalls", "sys_exit",
> trace__sys_exit)) {
>
> I don't understand much of what's going on, but what can be done to
> improve the situation for users?

If you trust your users make the debugfs mount point rx by group,world.

David

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