perf script: Print bpf-output events in 'perf script'
This patch allows 'perf script' output messages from BPF program. For
example, use test_bpf_output_3.c at the end of this commit message,
# ./perf record -e bpf-output/no-inherit,name=evt/ \
-e ./test_bpf_output_3.c/map:channel.event=evt/ \
usleep 100000
# ./perf script
usleep 4882 21384.532523: evt: ffffffff810e97d1 sys_nanosleep ([kernel.kallsyms])
BPF output: 0000: 52 61 69 73 65 20 61 20 Raise a
0008: 42 50 46 20 65 76 65 6e BPF even
0010: 74 21 00 00 t!..
BPF string: "Raise a BPF event!"
usleep 4882 21384.632606: evt: ffffffff8105c609 kretprobe_trampoline_holder ([kernel.kallsyms
BPF output: 0000: 52 61 69 73 65 20 61 20 Raise a
0008: 42 50 46 20 65 76 65 6e BPF even
0010: 74 21 00 00 t!..
BPF string: "Raise a BPF event!"
Two samples from BPF output are printed by both binary and string
format.
If BPF program output something unprintable, string format is
suppressed.
/************************ BEGIN **************************/
#include <uapi/linux/bpf.h>
struct bpf_map_def {
unsigned int type;
unsigned int key_size;
unsigned int value_size;
unsigned int max_entries;
};
#define SEC(NAME) __attribute__((section(NAME), used))
static u64 (*ktime_get_ns)(void) =
(void *)BPF_FUNC_ktime_get_ns;
static int (*trace_printk)(const char *fmt, int fmt_size, ...) =
(void *)BPF_FUNC_trace_printk;
static int (*get_smp_processor_id)(void) =
(void *)BPF_FUNC_get_smp_processor_id;
static int (*perf_event_output)(void *, struct bpf_map_def *, int, void *, unsigned long) =
(void *)BPF_FUNC_perf_event_output;
struct bpf_map_def SEC("maps") channel = {
.type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
.key_size = sizeof(int),
.value_size = sizeof(u32),
.max_entries = __NR_CPUS__,
};
static inline int __attribute__((always_inline))
func(void *ctx, int type)
{
char output_str[] = "Raise a BPF event!";
perf_event_output(ctx, &channel, get_smp_processor_id(),
&output_str, sizeof(output_str));
return 0;
}
SEC("func_begin=sys_nanosleep")
int func_begin(void *ctx) {return func(ctx, 1);}
SEC("func_end=sys_nanosleep%return")
int func_end(void *ctx) { return func(ctx, 2);}
char _license[] SEC("license") = "GPL";
int _version SEC("version") = LINUX_VERSION_CODE;
/************************* END ***************************/
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1456312845-111583-3-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Wang Nan
Arnaldo Carvalho de Melo
Родитель
c339b1a90e
Коммит
30372f04c9
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@ -61,6 +61,7 @@ enum perf_output_field {
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PERF_OUTPUT_BRSTACKSYM = 1U << 16,
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PERF_OUTPUT_DATA_SRC = 1U << 17,
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PERF_OUTPUT_WEIGHT = 1U << 18,
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PERF_OUTPUT_BPF_OUTPUT = 1U << 19,
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};
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struct output_option {
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@ -86,6 +87,7 @@ struct output_option {
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{.str = "brstacksym", .field = PERF_OUTPUT_BRSTACKSYM},
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{.str = "data_src", .field = PERF_OUTPUT_DATA_SRC},
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{.str = "weight", .field = PERF_OUTPUT_WEIGHT},
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{.str = "bpf-output", .field = PERF_OUTPUT_BPF_OUTPUT},
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};
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/* default set to maintain compatibility with current format */
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@ -106,7 +108,7 @@ static struct {
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PERF_OUTPUT_SYM | PERF_OUTPUT_DSO |
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PERF_OUTPUT_PERIOD,
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.invalid_fields = PERF_OUTPUT_TRACE,
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.invalid_fields = PERF_OUTPUT_TRACE | PERF_OUTPUT_BPF_OUTPUT,
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},
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[PERF_TYPE_SOFTWARE] = {
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@ -116,7 +118,7 @@ static struct {
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PERF_OUTPUT_CPU | PERF_OUTPUT_TIME |
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PERF_OUTPUT_EVNAME | PERF_OUTPUT_IP |
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PERF_OUTPUT_SYM | PERF_OUTPUT_DSO |
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PERF_OUTPUT_PERIOD,
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PERF_OUTPUT_PERIOD | PERF_OUTPUT_BPF_OUTPUT,
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.invalid_fields = PERF_OUTPUT_TRACE,
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},
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@ -126,7 +128,7 @@ static struct {
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.fields = PERF_OUTPUT_COMM | PERF_OUTPUT_TID |
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PERF_OUTPUT_CPU | PERF_OUTPUT_TIME |
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PERF_OUTPUT_EVNAME | PERF_OUTPUT_TRACE,
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PERF_OUTPUT_EVNAME | PERF_OUTPUT_TRACE
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},
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[PERF_TYPE_RAW] = {
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@ -139,7 +141,7 @@ static struct {
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PERF_OUTPUT_PERIOD | PERF_OUTPUT_ADDR |
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PERF_OUTPUT_DATA_SRC | PERF_OUTPUT_WEIGHT,
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.invalid_fields = PERF_OUTPUT_TRACE,
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.invalid_fields = PERF_OUTPUT_TRACE | PERF_OUTPUT_BPF_OUTPUT,
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},
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[PERF_TYPE_BREAKPOINT] = {
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@ -151,7 +153,7 @@ static struct {
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PERF_OUTPUT_SYM | PERF_OUTPUT_DSO |
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PERF_OUTPUT_PERIOD,
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.invalid_fields = PERF_OUTPUT_TRACE,
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.invalid_fields = PERF_OUTPUT_TRACE | PERF_OUTPUT_BPF_OUTPUT,
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},
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};
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@ -624,6 +626,84 @@ static void print_sample_flags(u32 flags)
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printf(" %-4s ", str);
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}
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struct printer_data {
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int line_no;
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bool hit_nul;
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bool is_printable;
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};
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static void
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print_sample_bpf_output_printer(enum binary_printer_ops op,
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unsigned int val,
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void *extra)
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{
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unsigned char ch = (unsigned char)val;
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struct printer_data *printer_data = extra;
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switch (op) {
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case BINARY_PRINT_DATA_BEGIN:
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printf("\n");
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break;
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case BINARY_PRINT_LINE_BEGIN:
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printf("%17s", !printer_data->line_no ? "BPF output:" :
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" ");
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break;
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case BINARY_PRINT_ADDR:
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printf(" %04x:", val);
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break;
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case BINARY_PRINT_NUM_DATA:
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printf(" %02x", val);
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break;
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case BINARY_PRINT_NUM_PAD:
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printf(" ");
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break;
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case BINARY_PRINT_SEP:
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printf(" ");
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break;
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case BINARY_PRINT_CHAR_DATA:
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if (printer_data->hit_nul && ch)
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printer_data->is_printable = false;
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if (!isprint(ch)) {
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printf("%c", '.');
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if (!printer_data->is_printable)
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break;
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if (ch == '\0')
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printer_data->hit_nul = true;
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else
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printer_data->is_printable = false;
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} else {
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printf("%c", ch);
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}
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break;
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case BINARY_PRINT_CHAR_PAD:
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printf(" ");
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break;
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case BINARY_PRINT_LINE_END:
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printf("\n");
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printer_data->line_no++;
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break;
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case BINARY_PRINT_DATA_END:
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default:
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break;
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}
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}
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static void print_sample_bpf_output(struct perf_sample *sample)
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{
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unsigned int nr_bytes = sample->raw_size;
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struct printer_data printer_data = {0, false, true};
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print_binary(sample->raw_data, nr_bytes, 8,
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print_sample_bpf_output_printer, &printer_data);
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if (printer_data.is_printable && printer_data.hit_nul)
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printf("%17s \"%s\"\n", "BPF string:",
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(char *)(sample->raw_data));
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}
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struct perf_script {
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struct perf_tool tool;
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struct perf_session *session;
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@ -731,6 +811,9 @@ static void process_event(struct perf_script *script, union perf_event *event,
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else if (PRINT_FIELD(BRSTACKSYM))
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print_sample_brstacksym(event, sample, thread, attr);
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if (perf_evsel__is_bpf_output(evsel) && PRINT_FIELD(BPF_OUTPUT))
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print_sample_bpf_output(sample);
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printf("\n");
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}
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