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Date: Fri, 18 Jun 2021 10:14:02 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Masami Hiramatsu <mhiramat@...nel.org>
Cc: linux-kernel@...r.kernel.org,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...hat.com>,
Namhyung Kim <namhyung@...nel.org>,
linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 3/3] perf/probe: Add --bootconfig to output definition in
bootconfig format
Em Sat, Jun 05, 2021 at 01:28:43AM +0900, Masami Hiramatsu escreveu:
> Now the boot-time tracing supports the kprobes events and that
> must be written in bootconfig file as following format.
>
> ftrace.event.kprobes.<EVENT_NAME>.probes = <PROBE-DEF>
>
> The perf probe already supports --definition (-D) action to
> show the probe definitions, but the format is for the tracefs.
You forgot to add the tools/perf/Documentation/perf-probe.txt entry for
this new command line option, please sent it as a followup patch.
Applied.
- Arnaldo
> [p|r][:EVENT_NAME] <PROBE-DEF>
>
> This adds --bootconfig option for -D action so that it output
> the probe definitions in bootconfig fromat. E.g.
>
> $ perf probe --bootconfig -D "path_lookupat:7 err:s32 s:string"
> ftrace.event.kprobes.path_lookupat_L7.probe = 'path_lookupat.isra.0+309 err_s32=%ax:s32 s_string=+0(%r13):string'
>
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> ---
> tools/perf/builtin-probe.c | 12 ++++++-
> tools/perf/util/probe-event.c | 72 +++++++++++++++++++++++++++++++++++++++++
> tools/perf/util/probe-event.h | 2 +
> 3 files changed, 85 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
> index 6b1507566770..2bfd41df621c 100644
> --- a/tools/perf/builtin-probe.c
> +++ b/tools/perf/builtin-probe.c
> @@ -347,7 +347,10 @@ static int perf_add_probe_events(struct perf_probe_event *pevs, int npevs)
> goto out_cleanup;
>
> if (params.command == 'D') { /* it shows definition */
> - ret = show_probe_trace_events(pevs, npevs);
> + if (probe_conf.bootconfig)
> + ret = show_bootconfig_events(pevs, npevs);
> + else
> + ret = show_probe_trace_events(pevs, npevs);
> goto out_cleanup;
> }
>
> @@ -581,6 +584,8 @@ __cmd_probe(int argc, const char **argv)
> "Look for files with symbols relative to this directory"),
> OPT_CALLBACK(0, "target-ns", NULL, "pid",
> "target pid for namespace contexts", opt_set_target_ns),
> + OPT_BOOLEAN(0, "bootconfig", &probe_conf.bootconfig,
> + "Output probe definition with bootconfig format"),
> OPT_END()
> };
> int ret;
> @@ -692,6 +697,11 @@ __cmd_probe(int argc, const char **argv)
> }
> break;
> case 'D':
> + if (probe_conf.bootconfig && params.uprobes) {
> + pr_err(" Error: --bootconfig doesn't support uprobes.\n");
> + return -EINVAL;
> + }
> + __fallthrough;
> case 'a':
>
> /* Ensure the last given target is used */
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index 505c0702dbe2..f1348fa3dd1b 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -3564,6 +3564,78 @@ int show_probe_trace_events(struct perf_probe_event *pevs, int npevs)
> return ret;
> }
>
> +static int show_bootconfig_event(struct probe_trace_event *tev)
> +{
> + struct probe_trace_point *tp = &tev->point;
> + struct strbuf buf;
> + char *ret = NULL;
> + int err;
> +
> + if (strbuf_init(&buf, 32) < 0)
> + return -ENOMEM;
> +
> + err = synthesize_kprobe_trace_def(tp, &buf);
> + if (err >= 0)
> + err = synthesize_probe_trace_args(tev, &buf);
> + if (err >= 0)
> + ret = strbuf_detach(&buf, NULL);
> + strbuf_release(&buf);
> +
> + if (ret) {
> + printf("'%s'", ret);
> + free(ret);
> + }
> +
> + return err;
> +}
> +
> +int show_bootconfig_events(struct perf_probe_event *pevs, int npevs)
> +{
> + struct strlist *namelist = strlist__new(NULL, NULL);
> + struct probe_trace_event *tev;
> + struct perf_probe_event *pev;
> + char *cur_name = NULL;
> + int i, j, ret = 0;
> +
> + if (!namelist)
> + return -ENOMEM;
> +
> + for (j = 0; j < npevs && !ret; j++) {
> + pev = &pevs[j];
> + if (pev->group && strcmp(pev->group, "probe"))
> + pr_warning("WARN: Group name %s is ignored\n", pev->group);
> + if (pev->uprobes) {
> + pr_warning("ERROR: Bootconfig doesn't support uprobes\n");
> + ret = -EINVAL;
> + break;
> + }
> + for (i = 0; i < pev->ntevs && !ret; i++) {
> + tev = &pev->tevs[i];
> + /* Skip if the symbol is out of .text or blacklisted */
> + if (!tev->point.symbol && !pev->uprobes)
> + continue;
> +
> + /* Set new name for tev (and update namelist) */
> + ret = probe_trace_event__set_name(tev, pev,
> + namelist, true);
> + if (ret)
> + break;
> +
> + if (!cur_name || strcmp(cur_name, tev->event)) {
> + printf("%sftrace.event.kprobes.%s.probe = ",
> + cur_name ? "\n" : "", tev->event);
> + cur_name = tev->event;
> + } else
> + printf(", ");
> + ret = show_bootconfig_event(tev);
> + }
> + }
> + printf("\n");
> + strlist__delete(namelist);
> +
> + return ret;
> +}
> +
> int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs)
> {
> int i, ret = 0;
> diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
> index 4f0eb3a20c36..65769d7949a3 100644
> --- a/tools/perf/util/probe-event.h
> +++ b/tools/perf/util/probe-event.h
> @@ -15,6 +15,7 @@ struct probe_conf {
> bool force_add;
> bool no_inlines;
> bool cache;
> + bool bootconfig;
> int max_probes;
> unsigned long magic_num;
> };
> @@ -163,6 +164,7 @@ int add_perf_probe_events(struct perf_probe_event *pevs, int npevs);
> int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs);
> int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs);
> int show_probe_trace_events(struct perf_probe_event *pevs, int npevs);
> +int show_bootconfig_events(struct perf_probe_event *pevs, int npevs);
> void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs);
>
> struct strfilter;
>
--
- Arnaldo
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