Messages in this thread Patch in this message |  | | From | Wang Nan <> | Subject | [PATCH 15/55] perf tools: Enable indices setting syntax for BPF maps | Date | Fri, 19 Feb 2016 11:44:03 +0000 |
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This patch introduces a new syntax to perf event parser:
# perf record -e './test_bpf_map_3.c/maps:channel.value[0,1,2,3...5]=101/' usleep 2
By utilizing the basic facilities in bpf-loader.c which allow setting different slots in a BPF map separately, the newly introduced syntax allows perf to control specific elements in a BPF map.
Test result:
# cat ./test_bpf_map_3.c /************************ BEGIN **************************/ #include <uapi/linux/bpf.h> #define SEC(NAME) __attribute__((section(NAME), used)) struct bpf_map_def { unsigned int type; unsigned int key_size; unsigned int value_size; unsigned int max_entries; }; static void *(*map_lookup_elem)(struct bpf_map_def *, void *) = (void *)BPF_FUNC_map_lookup_elem; static int (*trace_printk)(const char *fmt, int fmt_size, ...) = (void *)BPF_FUNC_trace_printk; struct bpf_map_def SEC("maps") channel = { .type = BPF_MAP_TYPE_ARRAY, .key_size = sizeof(int), .value_size = sizeof(unsigned char), .max_entries = 100, }; SEC("func=hrtimer_nanosleep rqtp->tv_nsec") int func(void *ctx, int err, long nsec) { char fmt[] = "%ld\n"; long usec = nsec * 0x10624dd3 >> 38; // nsec / 1000 int key = (int)usec; unsigned char *pval = map_lookup_elem(&channel, &key);
if (!pval) return 0; trace_printk(fmt, sizeof(fmt), (unsigned char)*pval); return 0; } char _license[] SEC("license") = "GPL"; int _version SEC("version") = LINUX_VERSION_CODE; /************************* END ***************************/
Normal case: # echo "" > /sys/kernel/debug/tracing/trace # ./perf record -e './test_bpf_map_3.c/maps:channel.value[0,1,2,3...5]=101/' usleep 2 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.012 MB perf.data ] # cat /sys/kernel/debug/tracing/trace | grep usleep usleep-405 [004] d... 2745423.547822: : 101 # ./perf record -e './test_bpf_map_3.c/maps:channel.value[0...9,20...29]=102,maps:channel.value[10...19]=103/' usleep 3 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.012 MB perf.data ] # ./perf record -e './test_bpf_map_3.c/maps:channel.value[0...9,20...29]=102,maps:channel.value[10...19]=103/' usleep 15 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.012 MB perf.data ] # cat /sys/kernel/debug/tracing/trace | grep usleep usleep-405 [004] d... 2745423.547822: : 101 usleep-655 [006] d... 2745434.122814: : 102 usleep-904 [006] d... 2745439.916264: : 103 # ./perf record -e './test_bpf_map_3.c/maps:channel.value[all]=104/' usleep 99 # cat /sys/kernel/debug/tracing/trace | grep usleep usleep-405 [004] d... 2745423.547822: : 101 usleep-655 [006] d... 2745434.122814: : 102 usleep-904 [006] d... 2745439.916264: : 103 usleep-1537 [003] d... 2745538.053737: : 104
Error case: # ./perf record -e './test_bpf_map_3.c/maps:channel.value[10...1000]=104/' usleep 99 event syntax error: '..annel.value[10...1000]=104/' \___ Index too large Hint: Valid config terms: maps:[<arraymap>].value<indices>=[value] maps:[<eventmap>].event<indices>=[event]
where <indices> is something like [0,3...5] or [all] (add -v to see detail) Run 'perf list' for a list of valid events
Usage: perf record [<options>] [<command>] or: perf record [<options>] -- <command> [<options>]
-e, --event <event> event selector. use 'perf list' to list available events
Signed-off-by: Wang Nan <wangnan0@huawei.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com --- tools/perf/util/parse-events.c | 5 ++- tools/perf/util/parse-events.l | 13 ++++++- tools/perf/util/parse-events.y | 85 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 100 insertions(+), 3 deletions(-)
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index dfb3d9d..a9734f8 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -704,9 +704,10 @@ parse_events_config_bpf(struct parse_events_evlist *data, sizeof(errbuf)); data->error->help = strdup( "Hint:\tValid config terms:\n" -" \tmaps:[<arraymap>].value=[value]\n" -" \tmaps:[<eventmap>].event=[event]\n" +" \tmaps:[<arraymap>].value<indices>=[value]\n" +" \tmaps:[<eventmap>].event<indices>=[event]\n" "\n" +" \twhere <indices> is something like [0,3...5] or [all]\n" " \t(add -v to see detail)"); data->error->str = strdup(errbuf); if (err == -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE) diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l index 0cc6b84..fb85d03 100644 --- a/tools/perf/util/parse-events.l +++ b/tools/perf/util/parse-events.l @@ -9,8 +9,8 @@ %{ #include <errno.h> #include "../perf.h" -#include "parse-events-bison.h" #include "parse-events.h" +#include "parse-events-bison.h" char *parse_events_get_text(yyscan_t yyscanner); YYSTYPE *parse_events_get_lval(yyscan_t yyscanner); @@ -111,6 +111,7 @@ do { \ %x mem %s config %x event +%x array group [^,{}/]*[{][^}]*[}][^,{}/]* event_pmu [^,{}/]+[/][^/]*[/][^,{}/]* @@ -176,6 +177,14 @@ modifier_bp [rwx]{1,3} } +<array>{ +"]" { BEGIN(config); return ']'; } +{num_dec} { return value(yyscanner, 10); } +{num_hex} { return value(yyscanner, 16); } +, { return ','; } +"\.\.\." { return PE_ARRAY_RANGE; } +} + <config>{ /* * Please update config_term_names when new static term is added. @@ -195,6 +204,8 @@ no-inherit { return term(yyscanner, PARSE_EVENTS__TERM_TYPE_NOINHERIT); } , { return ','; } "/" { BEGIN(INITIAL); return '/'; } {name_minus} { return str(yyscanner, PE_NAME); } +\[all\] { return PE_ARRAY_ALL; } +"[" { BEGIN(array); return '['; } } <mem>{ diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y index 359ef6a..4992fb9 100644 --- a/tools/perf/util/parse-events.y +++ b/tools/perf/util/parse-events.y @@ -48,6 +48,7 @@ static inc_group_count(struct list_head *list, %token PE_PREFIX_MEM PE_PREFIX_RAW PE_PREFIX_GROUP %token PE_ERROR %token PE_PMU_EVENT_PRE PE_PMU_EVENT_SUF PE_KERNEL_PMU_EVENT +%token PE_ARRAY_ALL PE_ARRAY_RANGE %type <num> PE_VALUE %type <num> PE_VALUE_SYM_HW %type <num> PE_VALUE_SYM_SW @@ -83,6 +84,9 @@ static inc_group_count(struct list_head *list, %type <head> group_def %type <head> group %type <head> groups +%type <array> array +%type <array> array_term +%type <array> array_terms %union { @@ -94,6 +98,7 @@ static inc_group_count(struct list_head *list, char *sys; char *event; } tracepoint_name; + struct parse_events_array array; } %% @@ -594,6 +599,86 @@ PE_TERM ABORT_ON(parse_events_term__num(&term, (int)$1, NULL, 1, &@1, NULL)); $$ = term; } +| +PE_NAME array '=' PE_NAME +{ + struct parse_events_term *term; + int i; + + ABORT_ON(parse_events_term__str(&term, PARSE_EVENTS__TERM_TYPE_USER, + $1, $4, &@1, &@4)); + + term->array = $2; + $$ = term; +} +| +PE_NAME array '=' PE_VALUE +{ + struct parse_events_term *term; + + ABORT_ON(parse_events_term__num(&term, PARSE_EVENTS__TERM_TYPE_USER, + $1, $4, &@1, &@4)); + term->array = $2; + $$ = term; +} + +array: +'[' array_terms ']' +{ + $$ = $2; +} +| +PE_ARRAY_ALL +{ + $$.nr_ranges = 0; + $$.ranges = NULL; +} + +array_terms: +array_terms ',' array_term +{ + struct parse_events_array new_array; + + new_array.nr_ranges = $1.nr_ranges + $3.nr_ranges; + new_array.ranges = malloc(sizeof(new_array.ranges[0]) * + new_array.nr_ranges); + ABORT_ON(!new_array.ranges); + memcpy(&new_array.ranges[0], $1.ranges, + $1.nr_ranges * sizeof(new_array.ranges[0])); + memcpy(&new_array.ranges[$1.nr_ranges], $3.ranges, + $3.nr_ranges * sizeof(new_array.ranges[0])); + free($1.ranges); + free($3.ranges); + $$ = new_array; +} +| +array_term + +array_term: +PE_VALUE +{ + struct parse_events_array array; + + array.nr_ranges = 1; + array.ranges = malloc(sizeof(array.ranges[0])); + ABORT_ON(!array.ranges); + array.ranges[0].start = $1; + array.ranges[0].length = 1; + $$ = array; +} +| +PE_VALUE PE_ARRAY_RANGE PE_VALUE +{ + struct parse_events_array array; + + ABORT_ON($3 < $1); + array.nr_ranges = 1; + array.ranges = malloc(sizeof(array.ranges[0])); + ABORT_ON(!array.ranges); + array.ranges[0].start = $1; + array.ranges[0].length = $3 - $1 + 1; + $$ = array; +} sep_dc: ':' | -- 1.8.3.4
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