From 7e035929f3fec70d411fb660c434f4a7f8ca386d Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Tue, 1 Oct 2019 15:44:44 -0300 Subject: [PATCH] perf trace: Postpone parsing .perfconfig trace.add_events to after --verbose is processed MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When we add events via the '[trace]' section in perfconfig the command line options are not yet processed, so when something goes wrong with parsing those events and using --verbose is advised, we end up not getting any more verbosity by doing so. So just copy the trace.add_events string for later processing, after we processed --verbose and the other command line options. Cc: Adrian Hunter Cc: Jiri Olsa Cc: Luis Cláudio Gonçalves Cc: Namhyung Kim Link: https://lkml.kernel.org/n/tip-d6wbnz85ftqljdll6ynjyjd8@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-trace.c | 31 ++++++++++++++++++++++--------- 1 file changed, 22 insertions(+), 9 deletions(-) diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 313dfc1cefc5..3d54316639a4 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -162,6 +162,7 @@ struct trace { bool force; bool vfs_getname; int trace_pgfaults; + char *perfconfig_events; struct { struct ordered_events data; u64 last; @@ -4044,15 +4045,11 @@ static int trace__config(const char *var, const char *value, void *arg) int err = 0; if (!strcmp(var, "trace.add_events")) { - struct option o = OPT_CALLBACK('e', "event", &trace->evlist, "event", - "event selector. use 'perf list' to list available events", - parse_events_option); - /* - * We can't propagate parse_event_option() return, as it is 1 - * for failure while perf_config() expects -1. - */ - if (parse_events_option(&o, value, 0)) - err = -1; + trace->perfconfig_events = strdup(value); + if (trace->perfconfig_events == NULL) { + pr_err("Not enough memory for %s\n", "trace.add_events"); + return -1; + } } else if (!strcmp(var, "trace.show_timestamp")) { trace->show_tstamp = perf_config_bool(var, value); } else if (!strcmp(var, "trace.show_duration")) { @@ -4224,6 +4221,21 @@ int cmd_trace(int argc, const char **argv) argc = parse_options_subcommand(argc, argv, trace_options, trace_subcommands, trace_usage, PARSE_OPT_STOP_AT_NON_OPTION); + /* + * Now that we have --verbose figured out, lets see if we need to parse + * events from .perfconfig, so that if those events fail parsing, say some + * BPF program fails, then we'll be able to use --verbose to see what went + * wrong in more detail. + */ + if (trace.perfconfig_events != NULL) { + struct parse_events_error parse_err = { .idx = 0, }; + + err = parse_events(trace.evlist, trace.perfconfig_events, &parse_err); + if (err) { + parse_events_print_error(&parse_err, trace.perfconfig_events); + goto out; + } + } if ((nr_cgroups || trace.cgroup) && !trace.opts.target.system_wide) { usage_with_options_msg(trace_usage, trace_options, @@ -4441,5 +4453,6 @@ out_close: if (output_name != NULL) fclose(trace.output); out: + zfree(&trace.perfconfig_events); return err; }