Messages in this thread | | | From | Arnaldo Carvalho de Melo <> | Date | Wed, 6 Nov 2019 16:54:32 -0300 | Subject | Re: [PATCH 2/5] perf probe: Generate event name with line number |
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Em Tue, Nov 05, 2019 at 09:16:59AM +0900, Masami Hiramatsu escreveu: > Generate event name from function name with line number > as <function>_L<line_number>. Note that this is only for > the new event which is defined by function and lines. > > If there is another event on same line, you have to use > "-f" option. In that case, the new event has "_1" suffix.
So I don't like this, the existing practice of, if given a function name, just create the probe:name looks more natural, if one states kernel:1, then, sure, appending L1 to them is natural, better than the previous naming convention,
Thanks,
- Arnaldo
> e.g. > # perf probe -a kernel_read > Added new event: > probe:kernel_read_L0 (on kernel_read) > > You can now use it in all perf tools, such as: > > perf record -e probe:kernel_read_L0 -aR sleep 1 > > # perf probe -a kernel_read:1 > Added new events: > probe:kernel_read_L1 (on kernel_read:1) > > You can now use it in all perf tools, such as: > > perf record -e probe:kernel_read_L1_1 -aR sleep 1 > > # perf probe -l > probe:kernel_read_L0 (on kernel_read@linux/linux/fs/read_write.c) > probe:kernel_read_L1 (on kernel_read@linux/linux/fs/read_write.c) > > Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> > --- > tools/perf/util/probe-event.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c > index 91cab5f669d2..d14b970a6461 100644 > --- a/tools/perf/util/probe-event.c > +++ b/tools/perf/util/probe-event.c > @@ -1679,6 +1679,14 @@ int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev) > if (ret < 0) > goto out; > > + /* Generate event name if needed */ > + if (!pev->event && pev->point.function > + && !pev->point.lazy_line && !pev->point.offset) { > + if (asprintf(&pev->event, "%s_L%d", pev->point.function, > + pev->point.line) < 0) > + return -ENOMEM; > + } > + > /* Copy arguments and ensure return probe has no C argument */ > pev->nargs = argc - 1; > pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
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- Arnaldo
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