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Date: Thu, 27 Apr 2023 08:26:40 -0700
From: Ian Rogers <irogers@...gle.com>
To: Adrian Hunter <adrian.hunter@...el.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 1/1] perf tools: Allow config terms with breakpoints
On Thu, Apr 27, 2023 at 5:27 AM Adrian Hunter <adrian.hunter@...el.com> wrote:
>
> Add config terms to the parsing of breakpoint events. Extend "Test event
> parsing" to also cover using a confg term.
>
> This makes breakpoint events consistent with other events which already
> support config terms.
>
> Example:
>
> $ cat dr_test.c
> #include <unistd.h>
> #include <stdio.h>
>
> void func0(void)
> {
> }
>
> int main()
> {
> printf("func0 %p\n", &func0);
> while (1) {
> func0();
> usleep(100000);
> }
> return 0;
> }
> $ gcc -g -O0 -o dr_test dr_test.c
> $ ./dr_test &
> [2] 19646
> func0 0x55feb98dd169
> $ perf record -e mem:0x55feb98dd169:x/name=breakpoint/ -p 19646 -- sleep 0.5
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.017 MB perf.data (5 samples) ]
> $ perf script
> dr_test 19646 5632.956628: 1 breakpoint: 55feb98dd169 func0+0x0 (/home/ahunter/git/work/dr_test)
> dr_test 19646 5633.056866: 1 breakpoint: 55feb98dd169 func0+0x0 (/home/ahunter/git/work/dr_test)
> dr_test 19646 5633.157084: 1 breakpoint: 55feb98dd169 func0+0x0 (/home/ahunter/git/work/dr_test)
> dr_test 19646 5633.257309: 1 breakpoint: 55feb98dd169 func0+0x0 (/home/ahunter/git/work/dr_test)
> dr_test 19646 5633.357532: 1 breakpoint: 55feb98dd169 func0+0x0 (/home/ahunter/git/work/dr_test)
> $ sudo perf test "Test event parsing"
> 6: Parse event definition strings :
> 6.1: Test event parsing : Ok
> $ sudo perf test -v "Test event parsing" |& grep mem
> running test 8 'mem:0'
> running test 9 'mem:0:x'
> running test 10 'mem:0:r'
> running test 11 'mem:0:w'
> running test 19 'mem:0:u'
> running test 20 'mem:0:x:k'
> running test 21 'mem:0:r:hp'
> running test 22 'mem:0:w:up'
> running test 26 'mem:0:rw'
> running test 27 'mem:0:rw:kp'
> running test 42 'mem:0/1'
> running test 43 'mem:0/2:w'
> running test 44 'mem:0/4:rw:u'
> running test 58 'mem:0/name=breakpoint/'
> running test 59 'mem:0:x/name=breakpoint/'
> running test 60 'mem:0:r/name=breakpoint/'
> running test 61 'mem:0:w/name=breakpoint/'
> running test 62 'mem:0/name=breakpoint/u'
> running test 63 'mem:0:x/name=breakpoint/k'
> running test 64 'mem:0:r/name=breakpoint/hp'
> running test 65 'mem:0:w/name=breakpoint/up'
> running test 66 'mem:0:rw/name=breakpoint/'
> running test 67 'mem:0:rw/name=breakpoint/kp'
> running test 68 'mem:0/1/name=breakpoint/'
> running test 69 'mem:0/2:w/name=breakpoint/'
> running test 70 'mem:0/4:rw/name=breakpoint/u'
>
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
> tools/perf/tests/parse-events.c | 135 ++++++++++++++++++++++++++++++++
> tools/perf/util/parse-events.c | 23 +++++-
> tools/perf/util/parse-events.h | 6 +-
> tools/perf/util/parse-events.l | 7 +-
> tools/perf/util/parse-events.y | 42 +++++-----
> 5 files changed, 187 insertions(+), 26 deletions(-)
>
> diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c
> index 8068cfd89b84..f424ad77da60 100644
> --- a/tools/perf/tests/parse-events.c
> +++ b/tools/perf/tests/parse-events.c
> @@ -439,6 +439,76 @@ static int test__checkevent_breakpoint_rw_modifier(struct evlist *evlist)
> return test__checkevent_breakpoint_rw(evlist);
> }
>
> +static int test__checkevent_breakpoint_modifier_name(struct evlist *evlist)
> +{
> + struct evsel *evsel = evlist__first(evlist);
> +
> + TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> + TEST_ASSERT_VAL("wrong exclude_kernel", evsel->core.attr.exclude_kernel);
> + TEST_ASSERT_VAL("wrong exclude_hv", evsel->core.attr.exclude_hv);
> + TEST_ASSERT_VAL("wrong precise_ip", !evsel->core.attr.precise_ip);
> + TEST_ASSERT_VAL("wrong name",
> + !strcmp(evsel__name(evsel), "breakpoint"));
> +
> + return test__checkevent_breakpoint(evlist);
> +}
> +
> +static int test__checkevent_breakpoint_x_modifier_name(struct evlist *evlist)
> +{
> + struct evsel *evsel = evlist__first(evlist);
> +
> + TEST_ASSERT_VAL("wrong exclude_user", evsel->core.attr.exclude_user);
> + TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->core.attr.exclude_kernel);
> + TEST_ASSERT_VAL("wrong exclude_hv", evsel->core.attr.exclude_hv);
> + TEST_ASSERT_VAL("wrong precise_ip", !evsel->core.attr.precise_ip);
> + TEST_ASSERT_VAL("wrong name",
> + !strcmp(evsel__name(evsel), "breakpoint"));
> +
> + return test__checkevent_breakpoint_x(evlist);
> +}
> +
> +static int test__checkevent_breakpoint_r_modifier_name(struct evlist *evlist)
> +{
> + struct evsel *evsel = evlist__first(evlist);
> +
> + TEST_ASSERT_VAL("wrong exclude_user", evsel->core.attr.exclude_user);
> + TEST_ASSERT_VAL("wrong exclude_kernel", evsel->core.attr.exclude_kernel);
> + TEST_ASSERT_VAL("wrong exclude_hv", !evsel->core.attr.exclude_hv);
> + TEST_ASSERT_VAL("wrong precise_ip", evsel->core.attr.precise_ip);
> + TEST_ASSERT_VAL("wrong name",
> + !strcmp(evsel__name(evsel), "breakpoint"));
> +
> + return test__checkevent_breakpoint_r(evlist);
> +}
> +
> +static int test__checkevent_breakpoint_w_modifier_name(struct evlist *evlist)
> +{
> + struct evsel *evsel = evlist__first(evlist);
> +
> + TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> + TEST_ASSERT_VAL("wrong exclude_kernel", evsel->core.attr.exclude_kernel);
> + TEST_ASSERT_VAL("wrong exclude_hv", evsel->core.attr.exclude_hv);
> + TEST_ASSERT_VAL("wrong precise_ip", evsel->core.attr.precise_ip);
> + TEST_ASSERT_VAL("wrong name",
> + !strcmp(evsel__name(evsel), "breakpoint"));
> +
> + return test__checkevent_breakpoint_w(evlist);
> +}
> +
> +static int test__checkevent_breakpoint_rw_modifier_name(struct evlist *evlist)
> +{
> + struct evsel *evsel = evlist__first(evlist);
> +
> + TEST_ASSERT_VAL("wrong exclude_user", evsel->core.attr.exclude_user);
> + TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->core.attr.exclude_kernel);
> + TEST_ASSERT_VAL("wrong exclude_hv", evsel->core.attr.exclude_hv);
> + TEST_ASSERT_VAL("wrong precise_ip", evsel->core.attr.precise_ip);
> + TEST_ASSERT_VAL("wrong name",
> + !strcmp(evsel__name(evsel), "breakpoint"));
> +
> + return test__checkevent_breakpoint_rw(evlist);
> +}
> +
> static int test__checkevent_pmu(struct evlist *evlist)
> {
>
> @@ -1973,6 +2043,71 @@ static const struct evlist_test test__events[] = {
> .check = test__exclusive_group,
> /* 7 */
> },
> + {
> + .name = "mem:0/name=breakpoint/",
> + .check = test__checkevent_breakpoint,
> + /* 8 */
> + },
> + {
> + .name = "mem:0:x/name=breakpoint/",
> + .check = test__checkevent_breakpoint_x,
> + /* 9 */
> + },
> + {
> + .name = "mem:0:r/name=breakpoint/",
> + .check = test__checkevent_breakpoint_r,
> + /* 0 */
> + },
> + {
> + .name = "mem:0:w/name=breakpoint/",
> + .check = test__checkevent_breakpoint_w,
> + /* 1 */
> + },
> + {
> + .name = "mem:0/name=breakpoint/u",
> + .check = test__checkevent_breakpoint_modifier_name,
> + /* 2 */
> + },
> + {
> + .name = "mem:0:x/name=breakpoint/k",
> + .check = test__checkevent_breakpoint_x_modifier_name,
> + /* 3 */
> + },
> + {
> + .name = "mem:0:r/name=breakpoint/hp",
> + .check = test__checkevent_breakpoint_r_modifier_name,
> + /* 4 */
> + },
> + {
> + .name = "mem:0:w/name=breakpoint/up",
> + .check = test__checkevent_breakpoint_w_modifier_name,
> + /* 5 */
> + },
> + {
> + .name = "mem:0:rw/name=breakpoint/",
> + .check = test__checkevent_breakpoint_rw,
> + /* 6 */
> + },
> + {
> + .name = "mem:0:rw/name=breakpoint/kp",
> + .check = test__checkevent_breakpoint_rw_modifier_name,
> + /* 7 */
> + },
> + {
> + .name = "mem:0/1/name=breakpoint/",
> + .check = test__checkevent_breakpoint_len,
> + /* 8 */
> + },
> + {
> + .name = "mem:0/2:w/name=breakpoint/",
> + .check = test__checkevent_breakpoint_len_w,
> + /* 9 */
> + },
> + {
> + .name = "mem:0/4:rw/name=breakpoint/u",
> + .check = test__checkevent_breakpoint_len_rw_modifier,
> + /* 0 */
> + },
> };
>
> static const struct evlist_test test__events_pmu[] = {
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index d71019dcd614..4f4901753f25 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -896,10 +896,14 @@ do { \
> return 0;
> }
>
> -int parse_events_add_breakpoint(struct list_head *list, int *idx,
> - u64 addr, char *type, u64 len)
> +int parse_events_add_breakpoint(struct parse_events_state *parse_state,
> + struct list_head *list,
> + u64 addr, char *type, u64 len,
> + struct list_head *head_config __maybe_unused)
> {
> struct perf_event_attr attr;
> + LIST_HEAD(config_terms);
> + const char *name;
>
> memset(&attr, 0, sizeof(attr));
> attr.bp_addr = addr;
> @@ -920,8 +924,19 @@ int parse_events_add_breakpoint(struct list_head *list, int *idx,
> attr.type = PERF_TYPE_BREAKPOINT;
> attr.sample_period = 1;
>
> - return add_event(list, idx, &attr, /*name=*/NULL, /*mertic_id=*/NULL,
> - /*config_terms=*/NULL);
> + if (head_config) {
> + if (config_attr(&attr, head_config, parse_state->error,
> + config_term_common))
> + return -EINVAL;
> +
> + if (get_config_terms(head_config, &config_terms))
> + return -ENOMEM;
> + }
> +
> + name = get_config_name(head_config);
> +
> + return add_event(list, &parse_state->idx, &attr, name, /*mertic_id=*/NULL,
> + &config_terms);
> }
>
> static int check_type_val(struct parse_events_term *term,
> diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
> index 86ad4438a2aa..6cb2076f1577 100644
> --- a/tools/perf/util/parse-events.h
> +++ b/tools/perf/util/parse-events.h
> @@ -179,8 +179,10 @@ int parse_events_add_cache(struct list_head *list, int *idx,
> struct parse_events_error *error,
> struct list_head *head_config,
> struct parse_events_state *parse_state);
> -int parse_events_add_breakpoint(struct list_head *list, int *idx,
> - u64 addr, char *type, u64 len);
> +int parse_events_add_breakpoint(struct parse_events_state *parse_state,
> + struct list_head *list,
> + u64 addr, char *type, u64 len,
> + struct list_head *head_config);
> int parse_events_add_pmu(struct parse_events_state *parse_state,
> struct list_head *list, char *name,
> struct list_head *head_config,
> diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
> index 51fe0a9fb3de..0d05594e7890 100644
> --- a/tools/perf/util/parse-events.l
> +++ b/tools/perf/util/parse-events.l
> @@ -218,6 +218,8 @@ drv_cfg_term [a-zA-Z0-9_\.]+(=[a-zA-Z0-9_*?\.:]+)?
> /* If you add a modifier you need to update check_modifier() */
> modifier_event [ukhpPGHSDIWeb]+
> modifier_bp [rwx]{1,3}
> +digit [0-9]
> +non_digit [^0-9]
>
> %%
>
> @@ -315,8 +317,9 @@ r0x{num_raw_hex} { return raw(yyscanner); }
>
> <mem>{
> {modifier_bp} { return str(yyscanner, PE_MODIFIER_BP); }
> -: { return ':'; }
> -"/" { return '/'; }
> +":"/{modifier_bp} { return str(yyscanner, PE_BP_COLON); }
> +"/"/{digit} { return str(yyscanner, PE_BP_SLASH); }
> +"/"/{non_digit} { BEGIN(config); return '/'; }
Hi Adrian, at this point the lexer is going to match "/" and the
non-digits, consuming the non-digits. So if you have input after the /
then won't you have a parsing issue? Tweaking your example this could
be:
$ perf record -e
mem:0x55feb98dd169:x/name=breakpoint/,mem:0x55feb98dd169:x/name=breakpoint/
-p 19646 -- sleep 0.5
This will match "/,mem:" and return the token '/' which will then
cause an issue as the second 0x55feb98dd169 will then need to be
unput.. actually non_digit doesn't have a plus or star, so you'll
match the comma which I think still causes issues.
Hope this helps,
Ian
> {num_dec} { return value(yyscanner, 10); }
> {num_hex} { return value(yyscanner, 16); }
> /*
> diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
> index 4488443e506e..cfdb99537d07 100644
> --- a/tools/perf/util/parse-events.y
> +++ b/tools/perf/util/parse-events.y
> @@ -57,7 +57,7 @@ static void free_list_evsel(struct list_head* list_evsel)
> %token PE_EVENT_NAME
> %token PE_NAME
> %token PE_BPF_OBJECT PE_BPF_SOURCE
> -%token PE_MODIFIER_EVENT PE_MODIFIER_BP
> +%token PE_MODIFIER_EVENT PE_MODIFIER_BP PE_BP_COLON PE_BP_SLASH
> %token PE_NAME_CACHE_TYPE PE_NAME_CACHE_OP_RESULT
> %token PE_PREFIX_MEM PE_PREFIX_RAW PE_PREFIX_GROUP
> %token PE_ERROR
> @@ -78,6 +78,8 @@ static void free_list_evsel(struct list_head* list_evsel)
> %type <str> PE_NAME_CACHE_OP_RESULT
> %type <str> PE_MODIFIER_EVENT
> %type <str> PE_MODIFIER_BP
> +%type <str> PE_BP_COLON
> +%type <str> PE_BP_SLASH
> %type <str> PE_EVENT_NAME
> %type <str> PE_PMU_EVENT_PRE PE_PMU_EVENT_SUF PE_PMU_EVENT_SUF2 PE_KERNEL_PMU_EVENT PE_PMU_EVENT_FAKE
> %type <str> PE_DRV_CFG_TERM
> @@ -267,7 +269,7 @@ event_def
> event_def: event_pmu |
> event_legacy_symbol |
> event_legacy_cache sep_dc |
> - event_legacy_mem |
> + event_legacy_mem sep_dc |
> event_legacy_tracepoint sep_dc |
> event_legacy_numeric sep_dc |
> event_legacy_raw sep_dc |
> @@ -540,16 +542,16 @@ PE_NAME_CACHE_TYPE opt_event_config
> }
>
> event_legacy_mem:
> -PE_PREFIX_MEM PE_VALUE '/' PE_VALUE ':' PE_MODIFIER_BP sep_dc
> +PE_PREFIX_MEM PE_VALUE PE_BP_SLASH PE_VALUE PE_BP_COLON PE_MODIFIER_BP opt_event_config
> {
> - struct parse_events_state *parse_state = _parse_state;
> struct list_head *list;
> int err;
>
> list = alloc_list();
> ABORT_ON(!list);
> - err = parse_events_add_breakpoint(list, &parse_state->idx,
> - $2, $6, $4);
> + err = parse_events_add_breakpoint(_parse_state, list,
> + $2, $6, $4, $7);
> + parse_events_terms__delete($7);
> free($6);
> if (err) {
> free(list);
> @@ -558,31 +560,33 @@ PE_PREFIX_MEM PE_VALUE '/' PE_VALUE ':' PE_MODIFIER_BP sep_dc
> $$ = list;
> }
> |
> -PE_PREFIX_MEM PE_VALUE '/' PE_VALUE sep_dc
> +PE_PREFIX_MEM PE_VALUE PE_BP_SLASH PE_VALUE opt_event_config
> {
> - struct parse_events_state *parse_state = _parse_state;
> struct list_head *list;
> + int err;
>
> list = alloc_list();
> ABORT_ON(!list);
> - if (parse_events_add_breakpoint(list, &parse_state->idx,
> - $2, NULL, $4)) {
> + err = parse_events_add_breakpoint(_parse_state, list,
> + $2, NULL, $4, $5);
> + parse_events_terms__delete($5);
> + if (err) {
> free(list);
> YYABORT;
> }
> $$ = list;
> }
> |
> -PE_PREFIX_MEM PE_VALUE ':' PE_MODIFIER_BP sep_dc
> +PE_PREFIX_MEM PE_VALUE PE_BP_COLON PE_MODIFIER_BP opt_event_config
> {
> - struct parse_events_state *parse_state = _parse_state;
> struct list_head *list;
> int err;
>
> list = alloc_list();
> ABORT_ON(!list);
> - err = parse_events_add_breakpoint(list, &parse_state->idx,
> - $2, $4, 0);
> + err = parse_events_add_breakpoint(_parse_state, list,
> + $2, $4, 0, $5);
> + parse_events_terms__delete($5);
> free($4);
> if (err) {
> free(list);
> @@ -591,15 +595,17 @@ PE_PREFIX_MEM PE_VALUE ':' PE_MODIFIER_BP sep_dc
> $$ = list;
> }
> |
> -PE_PREFIX_MEM PE_VALUE sep_dc
> +PE_PREFIX_MEM PE_VALUE opt_event_config
> {
> - struct parse_events_state *parse_state = _parse_state;
> struct list_head *list;
> + int err;
>
> list = alloc_list();
> ABORT_ON(!list);
> - if (parse_events_add_breakpoint(list, &parse_state->idx,
> - $2, NULL, 0)) {
> + err = parse_events_add_breakpoint(_parse_state, list,
> + $2, NULL, 0, $3);
> + parse_events_terms__delete($3);
> + if (err) {
> free(list);
> YYABORT;
> }
> --
> 2.34.1
>
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