From 90df0249c2eae21f329760ee857575260926188a Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Wed, 9 Oct 2019 16:22:16 -0300 Subject: [PATCH] perf trace: Expand strings in filters to integers MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit So that one can try things like: # perf trace -e msr:* --filter="msr!=FS_BASE && msr != IA32_TSC_DEADLINE && msr != 0x830 && msr != 0x83f && msr !=IA32_SPEC_CTRL" --filter-pids 3750 That, at this point in the patchset, without any strtoul in place for tracepoint arguments, will result in: No resolver (strtoul) for "msr" in "msr:read_msr", can't set filter "(msr!=FS_BASE && msr != IA32_TSC_DEADLINE && msr != 0x830 && msr != 0x83f && msr !=IA32_SPEC_CTRL) && (common_pid != 25407 && common_pid != 3750)" # See you in the next cset! Cc: Adrian Hunter Cc: Brendan Gregg Cc: Jiri Olsa Cc: Luis Cláudio Gonçalves Cc: Namhyung Kim Link: https://lkml.kernel.org/n/tip-dx5j70fv2rgkeezd1cb3hv2p@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-trace.c | 130 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 130 insertions(+) diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 50a1aeb..515a800 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -3484,6 +3484,133 @@ static int ordered_events__deliver_event(struct ordered_events *oe, return __trace__deliver_event(trace, event->event); } +static struct syscall_arg_fmt *perf_evsel__syscall_arg_fmt(struct evsel *evsel, char *arg) +{ + struct tep_format_field *field; + struct syscall_arg_fmt *fmt = evsel->priv; + + if (evsel->tp_format == NULL || fmt == NULL) + return NULL; + + for (field = evsel->tp_format->format.fields; field; field = field->next, ++fmt) + if (strcmp(field->name, arg) == 0) + return fmt; + + return NULL; +} + +static int trace__expand_filter(struct trace *trace __maybe_unused, struct evsel *evsel) +{ + char *tok, *left = evsel->filter, *new_filter = evsel->filter; + + while ((tok = strpbrk(left, "=<>!")) != NULL) { + char *right = tok + 1, *right_end; + + if (*right == '=') + ++right; + + while (isspace(*right)) + ++right; + + if (*right == '\0') + break; + + while (!isalpha(*left)) + if (++left == tok) { + /* + * Bail out, can't find the name of the argument that is being + * used in the filter, let it try to set this filter, will fail later. + */ + return 0; + } + + right_end = right + 1; + while (isalnum(*right_end) || *right_end == '_') + ++right_end; + + if (isalpha(*right)) { + struct syscall_arg_fmt *fmt; + int left_size = tok - left, + right_size = right_end - right; + char arg[128]; + + while (isspace(left[left_size - 1])) + --left_size; + + scnprintf(arg, sizeof(arg), "%.*s", left_size, left); + + fmt = perf_evsel__syscall_arg_fmt(evsel, arg); + if (fmt == NULL) { + pr_debug("\"%s\" not found in \"%s\", can't set filter \"%s\"\n", + arg, evsel->name, evsel->filter); + return -1; + } + + pr_debug2("trying to expand \"%s\" \"%.*s\" \"%.*s\" -> ", + arg, (int)(right - tok), tok, right_size, right); + + if (fmt->strtoul) { + u64 val; + if (fmt->strtoul(right, right_size, NULL, &val)) { + char *n, expansion[19]; + int expansion_lenght = scnprintf(expansion, sizeof(expansion), "%#" PRIx64, val); + int expansion_offset = right - new_filter; + + pr_debug("%s", expansion); + + if (asprintf(&n, "%.*s%s%s", expansion_offset, new_filter, expansion, right_end) < 0) { + pr_debug(" out of memory!\n"); + free(new_filter); + return -1; + } + if (new_filter != evsel->filter) + free(new_filter); + left = n + expansion_offset + expansion_lenght; + new_filter = n; + } else { + pr_err("\"%.*s\" not found for \"%s\" in \"%s\", can't set filter \"%s\"\n", + right_size, right, arg, evsel->name, evsel->filter); + return -1; + } + } else { + pr_err("No resolver (strtoul) for \"%s\" in \"%s\", can't set filter \"%s\"\n", + arg, evsel->name, evsel->filter); + return -1; + } + + pr_debug("\n"); + } else { + left = right_end; + } + } + + if (new_filter != evsel->filter) { + pr_debug("New filter for %s: %s\n", evsel->name, new_filter); + perf_evsel__set_filter(evsel, new_filter); + free(new_filter); + } + + return 0; +} + +static int trace__expand_filters(struct trace *trace, struct evsel **err_evsel) +{ + struct evlist *evlist = trace->evlist; + struct evsel *evsel; + + evlist__for_each_entry(evlist, evsel) { + if (evsel->filter == NULL) + continue; + + if (trace__expand_filter(trace, evsel)) { + *err_evsel = evsel; + return -1; + } + } + + return 0; +} + static int trace__run(struct trace *trace, int argc, const char **argv) { struct evlist *evlist = trace->evlist; @@ -3625,6 +3752,9 @@ static int trace__run(struct trace *trace, int argc, const char **argv) */ trace->fd_path_disabled = !trace__syscall_enabled(trace, syscalltbl__id(trace->sctbl, "close")); + err = trace__expand_filters(trace, &evsel); + if (err) + goto out_delete_evlist; err = perf_evlist__apply_filters(evlist, &evsel); if (err < 0) goto out_error_apply_filters; -- 2.7.4