On Thu, Sep 05, 2013 at 08:29:10AM -0600, David Ahern wrote:
> On 9/5/13 2:32 AM, Rodrigo Campos wrote:
> >If you have the config options enabled in your kernel, you still need to be
> >root
> >to run perf lock. And is kind of misleading when you have that options
> >enabled
> >and the error says that they might not be.
> >
> >So, this patch just adds to the error that it should be run as root.
> >Although we
> >can probably check if it's running as root or not, adding it to the error
> >message is really simple and should be enough.
> >
> >Signed-off-by: Rodrigo Campos <rodr...@sdfg.com.ar>
> >---
> >Please keep me in Cc: since I'm not subscribed
> >---
> > tools/perf/builtin-lock.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> >diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
> >index 76543a4..f07b318 100644
> >--- a/tools/perf/builtin-lock.c
> >+++ b/tools/perf/builtin-lock.c
> >@@ -886,8 +886,8 @@ static int __cmd_record(int argc, const char **argv)
> > for (i = 0; i < ARRAY_SIZE(lock_tracepoints); i++) {
> > if (!is_valid_tracepoint(lock_tracepoints[i].name)) {
> > pr_err("tracepoint %s is not enabled. "
> >- "Are CONFIG_LOCKDEP and CONFIG_LOCK_STAT
> >enabled?\n",
> >- lock_tracepoints[i].name);
> >+ "Are CONFIG_LOCKDEP and CONFIG_LOCK_STAT
> >enabled "
> >+ "and running as root?\n",
> >lock_tracepoints[i].name);
> > return 1;
> > }
> > }
> >
>
> you can run perf-lock as non-root with certain settings. It would be
Ohh, I didn't know. Sorry.
> better to discriminate debugfs access errors (insufficient
> privilege). That means improving is_valid_tracepoint and handling
> the errors in perf-lock.
IMHO suggesting to check the privileges should be enough for most cases and is
simpler that checking all that. I mean, for me it's not worth the effort, but
maybe I'm too lazy. Probably it's quite simple too... :-)
Thanks,
Rodrigo
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