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perf trace: Expand strings in filters to integers

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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 <adrian.hunter@intel.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-dx5j70fv2rgkeezd1cb3hv2p@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2019-10-09 16:22:16 -03:00
parent d0a3a10410
commit 90df0249c2
1 changed files with 130 additions and 0 deletions
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130
tools/perf/builtin-trace.c
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@ -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;