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Date: Wed, 19 Jun 2024 10:48:48 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Howard Chu <howardchu95@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Kan Liang <kan.liang@...ux.intel.com>, linux-kernel@...r.kernel.org,
linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v2 4/5] perf trace: Filter enum arguments with enum names
On Wed, Jun 19, 2024 at 04:20:41PM +0800, Howard Chu wrote:
> Before:
>
> perf $ ./perf trace -e timer:hrtimer_start --filter='mode!=HRTIMER_MODE_ABS_PINNED_HARD' --max-events=1
> No resolver (strtoul) for "mode" in "timer:hrtimer_start", can't set filter "(mode!=HRTIMER_MODE_ABS_PINNED_HARD) && (common_pid != 281988)"
>
> After:
>
> perf $ ./perf trace -e timer:hrtimer_start --filter='mode!=HRTIMER_MODE_ABS_PINNED_HARD' --max-events=1
> 0.000 :0/0 timer:hrtimer_start(hrtimer: 0xffff9498a6ca5f18, function: 0xffffffffa77a5be0, expires: 12351248764875, softexpires: 12351248764875, mode: HRTIMER_MODE_ABS)
>
> && and ||:
>
> perf $ ./perf trace -e timer:hrtimer_start --filter='mode != HRTIMER_MODE_ABS_PINNED_HARD && mode != HRTIMER_MODE_ABS' --max-events=1
> 0.000 Hyprland/534 timer:hrtimer_start(hrtimer: 0xffff9497801a84d0, function: 0xffffffffc04cdbe0, expires: 12639434638458, softexpires: 12639433638458, mode: HRTIMER_MODE_REL)
>
> perf $ ./perf trace -e timer:hrtimer_start --filter='mode == HRTIMER_MODE_REL || mode == HRTIMER_MODE_PINNED' --max-events=1
> 0.000 ldlck-test/60639 timer:hrtimer_start(hrtimer: 0xffffb16404ee7bf8, function: 0xffffffffa7790420, expires: 12772614418016, softexpires: 12772614368016, mode: HRTIMER_MODE_REL)
>
> Switching it up, using both enum name and integer value(--filter='mode == HRTIMER_MODE_ABS_PINNED_HARD || mode == 0'):
>
> perf $ ./perf trace -e timer:hrtimer_start --filter='mode == HRTIMER_MODE_ABS_PINNED_HARD || mode == 0' --max-events=3
> 0.000 :0/0 timer:hrtimer_start(hrtimer: 0xffff9498a6ca5f18, function: 0xffffffffa77a5be0, expires: 12601748739825, softexpires: 12601748739825, mode: HRTIMER_MODE_ABS_PINNED_HARD)
> 0.036 :0/0 timer:hrtimer_start(hrtimer: 0xffff9498a6ca5f18, function: 0xffffffffa77a5be0, expires: 12518758748124, softexpires: 12518758748124, mode: HRTIMER_MODE_ABS_PINNED_HARD)
> 0.172 tmux: server/41881 timer:hrtimer_start(hrtimer: 0xffffb164081e7838, function: 0xffffffffa7790420, expires: 12518768255836, softexpires: 12518768205836, mode: HRTIMER_MODE_ABS)
>
> P.S.
> perf $ pahole hrtimer_mode
> enum hrtimer_mode {
> HRTIMER_MODE_ABS = 0,
> HRTIMER_MODE_REL = 1,
> HRTIMER_MODE_PINNED = 2,
> HRTIMER_MODE_SOFT = 4,
> HRTIMER_MODE_HARD = 8,
> HRTIMER_MODE_ABS_PINNED = 2,
> HRTIMER_MODE_REL_PINNED = 3,
> HRTIMER_MODE_ABS_SOFT = 4,
> HRTIMER_MODE_REL_SOFT = 5,
> HRTIMER_MODE_ABS_PINNED_SOFT = 6,
> HRTIMER_MODE_REL_PINNED_SOFT = 7,
> HRTIMER_MODE_ABS_HARD = 8,
> HRTIMER_MODE_REL_HARD = 9,
> HRTIMER_MODE_ABS_PINNED_HARD = 10,
> HRTIMER_MODE_REL_PINNED_HARD = 11,
> };
>
> Tested-by: Arnaldo Carvalho de Melo <acme@...nel.org>
> Suggested-by: Arnaldo Carvalho de Melo <acme@...nel.org>
> Reviewed-by: Arnaldo Carvalho de Melo <acme@...nel.org>
> Signed-off-by: Howard Chu <howardchu95@...il.com>
> ---
> tools/perf/builtin-trace.c | 89 ++++++++++++++++++++++++++++++++------
> 1 file changed, 76 insertions(+), 13 deletions(-)
>
> diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
> index bd16679fb4c0..1148c3edee97 100644
> --- a/tools/perf/builtin-trace.c
> +++ b/tools/perf/builtin-trace.c
> @@ -904,11 +904,36 @@ static size_t syscall_arg__scnprintf_getrandom_flags(char *bf, size_t size,
> .strtoul = STUL_STRARRAY_FLAGS, \
> .parm = &strarray__##array, }
>
> -static int btf_enum_find_entry(struct btf *btf, char *type, struct syscall_arg_fmt *arg_fmt)
> +#define SCA_GETRANDOM_FLAGS syscall_arg__scnprintf_getrandom_flags
The above seems unrelated? (The definition of SCA_GETRANDOM_FLAGS) as it
is not used in any other place in this patch, right?
- Arnaldo
> +
> +static const struct btf_type *btf_find_type(struct btf *btf, char *type)
> {
> const struct btf_type *bt;
> + int id = btf__find_by_name(btf, type);
> +
> + if (id < 0)
> + return NULL;
> +
> + bt = btf__type_by_id(btf, id);
> + if (bt == NULL)
> + return NULL;
> +
> + return bt;
> +}
> +
> +struct btf_parm {
> + struct btf *btf;
> + char *type;
> +};
> +
> +static bool syscall_arg__strtoul_btf_enum(char *bf, size_t size, struct syscall_arg *arg, u64 *val)
> +{
> + struct btf_parm *bparm = arg->parm;
> + struct btf *btf = bparm->btf;
> + char *type = bparm->type;
> char enum_prefix[][16] = { "enum", "const enum" }, *ep;
> - int id;
> + struct btf_enum *be;
> + const struct btf_type *bt;
> size_t i;
>
> for (i = 0; i < ARRAY_SIZE(enum_prefix); i++) {
> @@ -917,11 +942,38 @@ static int btf_enum_find_entry(struct btf *btf, char *type, struct syscall_arg_f
> type += strlen(ep) + 1;
> }
>
> - id = btf__find_by_name(btf, type);
> - if (id < 0)
> - return -1;
> + bt = btf_find_type(btf, type);
> + if (bt == NULL)
> + return false;
>
> - bt = btf__type_by_id(btf, id);
> + for (be = btf_enum(bt), i = 0; i < btf_vlen(bt); ++i, ++be) {
> + const char *name = btf__name_by_offset(btf, be->name_off);
> + int max_len = max(size, strlen(name));
> +
> + if (strncmp(name, bf, max_len) == 0) {
> + *val = be->val;
> + return true;
> + }
> + }
> +
> + return false;
> +}
> +
> +#define STUL_BTF_ENUM syscall_arg__strtoul_btf_enum
> +
> +static int btf_enum_find_entry(struct btf *btf, char *type, struct syscall_arg_fmt *arg_fmt)
> +{
> + char enum_prefix[][16] = { "enum", "const enum" }, *ep;
> + const struct btf_type *bt;
> + size_t i;
> +
> + for (i = 0; i < ARRAY_SIZE(enum_prefix); i++) {
> + ep = enum_prefix[i];
> + if (strlen(type) > strlen(ep) + 1 && strstarts(type, ep))
> + type += strlen(ep) + 1;
> + }
> +
> + bt = btf_find_type(btf, type);
> if (bt == NULL)
> return -1;
>
> @@ -1850,6 +1902,7 @@ syscall_arg_fmt__init_array(struct syscall_arg_fmt *arg, struct tep_format_field
> arg->scnprintf = SCA_FD;
> } else if (strstr(field->type, "enum") && use_btf != NULL) {
> *use_btf = arg->is_enum = true;
> + arg->strtoul = STUL_BTF_ENUM;
> } else {
> const struct syscall_arg_fmt *fmt =
> syscall_arg_fmt__find_by_name(field->name);
> @@ -3776,7 +3829,8 @@ static int ordered_events__deliver_event(struct ordered_events *oe,
> return __trace__deliver_event(trace, event->event);
> }
>
> -static struct syscall_arg_fmt *evsel__find_syscall_arg_fmt_by_name(struct evsel *evsel, char *arg)
> +static struct syscall_arg_fmt *evsel__find_syscall_arg_fmt_by_name(struct evsel *evsel, char *arg,
> + char **type)
> {
> struct tep_format_field *field;
> struct syscall_arg_fmt *fmt = __evsel__syscall_arg_fmt(evsel);
> @@ -3785,8 +3839,10 @@ static struct syscall_arg_fmt *evsel__find_syscall_arg_fmt_by_name(struct evsel
> return NULL;
>
> for (field = evsel->tp_format->format.fields; field; field = field->next, ++fmt)
> - if (strcmp(field->name, arg) == 0)
> + if (strcmp(field->name, arg) == 0) {
> + *type = field->type;
> return fmt;
> + }
>
> return NULL;
> }
> @@ -3824,14 +3880,14 @@ static int trace__expand_filter(struct trace *trace __maybe_unused, struct evsel
> struct syscall_arg_fmt *fmt;
> int left_size = tok - left,
> right_size = right_end - right;
> - char arg[128];
> + char arg[128], *type;
>
> while (isspace(left[left_size - 1]))
> --left_size;
>
> scnprintf(arg, sizeof(arg), "%.*s", left_size, left);
>
> - fmt = evsel__find_syscall_arg_fmt_by_name(evsel, arg);
> + fmt = evsel__find_syscall_arg_fmt_by_name(evsel, arg, &type);
> if (fmt == NULL) {
> pr_err("\"%s\" not found in \"%s\", can't set filter \"%s\"\n",
> arg, evsel->name, evsel->filter);
> @@ -3843,9 +3899,16 @@ static int trace__expand_filter(struct trace *trace __maybe_unused, struct evsel
>
> if (fmt->strtoul) {
> u64 val;
> - struct syscall_arg syscall_arg = {
> - .parm = fmt->parm,
> - };
> + struct syscall_arg syscall_arg;
> + struct btf_parm bparm;
> +
> + if (fmt->is_enum) {
> + bparm.btf = trace->btf;
> + bparm.type = type;
> + syscall_arg.parm = &bparm;
> + } else {
> + syscall_arg.parm = fmt->parm;
> + }
>
> if (fmt->strtoul(right, right_size, &syscall_arg, &val)) {
> char *n, expansion[19];
> --
> 2.45.2
>
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