mirror of https://gitee.com/openkylin/linux.git
tools/bpftool: switch map event_pipe to libbpf's perf_buffer
Switch event_pipe implementation to rely on new libbpf perf buffer API (it's raw low-level variant). Signed-off-by: Andrii Nakryiko <andriin@fb.com> Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com> Acked-by: Yonghong Song <yhs@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Andrii Nakryiko
Daniel Borkmann
parent
ee5cf82ce0
commit
9b190f185d
|
|
@ -28,7 +28,7 @@
|
|||
|
||||
#define MMAP_PAGE_CNT 16
|
||||
|
||||
static bool stop;
|
||||
static volatile bool stop;
|
||||
|
||||
struct event_ring_info {
|
||||
int fd;
|
||||
|
|
@ -44,32 +44,44 @@ struct perf_event_sample {
|
|||
unsigned char data[];
|
||||
};
|
||||
|
||||
struct perf_event_lost {
|
||||
struct perf_event_header header;
|
||||
__u64 id;
|
||||
__u64 lost;
|
||||
};
|
||||
|
||||
static void int_exit(int signo)
|
||||
{
|
||||
fprintf(stderr, "Stopping...\n");
|
||||
stop = true;
|
||||
}
|
||||
|
||||
struct event_pipe_ctx {
|
||||
bool all_cpus;
|
||||
int cpu;
|
||||
int idx;
|
||||
};
|
||||
|
||||
static enum bpf_perf_event_ret
|
||||
print_bpf_output(struct perf_event_header *event, void *private_data)
|
||||
print_bpf_output(void *private_data, int cpu, struct perf_event_header *event)
|
||||
{
|
||||
struct perf_event_sample *e = container_of(event, struct perf_event_sample,
|
||||
struct perf_event_sample *e = container_of(event,
|
||||
struct perf_event_sample,
|
||||
header);
|
||||
struct event_ring_info *ring = private_data;
|
||||
struct {
|
||||
struct perf_event_header header;
|
||||
__u64 id;
|
||||
__u64 lost;
|
||||
} *lost = (typeof(lost))event;
|
||||
struct perf_event_lost *lost = container_of(event,
|
||||
struct perf_event_lost,
|
||||
header);
|
||||
struct event_pipe_ctx *ctx = private_data;
|
||||
int idx = ctx->all_cpus ? cpu : ctx->idx;
|
||||
|
||||
if (json_output) {
|
||||
jsonw_start_object(json_wtr);
|
||||
jsonw_name(json_wtr, "type");
|
||||
jsonw_uint(json_wtr, e->header.type);
|
||||
jsonw_name(json_wtr, "cpu");
|
||||
jsonw_uint(json_wtr, ring->cpu);
|
||||
jsonw_uint(json_wtr, cpu);
|
||||
jsonw_name(json_wtr, "index");
|
||||
jsonw_uint(json_wtr, ring->key);
|
||||
jsonw_uint(json_wtr, idx);
|
||||
if (e->header.type == PERF_RECORD_SAMPLE) {
|
||||
jsonw_name(json_wtr, "timestamp");
|
||||
jsonw_uint(json_wtr, e->time);
|
||||
|
|
@ -89,7 +101,7 @@ print_bpf_output(struct perf_event_header *event, void *private_data)
|
|||
if (e->header.type == PERF_RECORD_SAMPLE) {
|
||||
printf("== @%lld.%09lld CPU: %d index: %d =====\n",
|
||||
e->time / 1000000000ULL, e->time % 1000000000ULL,
|
||||
ring->cpu, ring->key);
|
||||
cpu, idx);
|
||||
fprint_hex(stdout, e->data, e->size, " ");
|
||||
printf("\n");
|
||||
} else if (e->header.type == PERF_RECORD_LOST) {
|
||||
|
|
@ -103,87 +115,25 @@ print_bpf_output(struct perf_event_header *event, void *private_data)
|
|||
return LIBBPF_PERF_EVENT_CONT;
|
||||
}
|
||||
|
||||
static void
|
||||
perf_event_read(struct event_ring_info *ring, void **buf, size_t *buf_len)
|
||||
int do_event_pipe(int argc, char **argv)
|
||||
{
|
||||
enum bpf_perf_event_ret ret;
|
||||
|
||||
ret = bpf_perf_event_read_simple(ring->mem,
|
||||
MMAP_PAGE_CNT * get_page_size(),
|
||||
get_page_size(), buf, buf_len,
|
||||
print_bpf_output, ring);
|
||||
if (ret != LIBBPF_PERF_EVENT_CONT) {
|
||||
fprintf(stderr, "perf read loop failed with %d\n", ret);
|
||||
stop = true;
|
||||
}
|
||||
}
|
||||
|
||||
static int perf_mmap_size(void)
|
||||
{
|
||||
return get_page_size() * (MMAP_PAGE_CNT + 1);
|
||||
}
|
||||
|
||||
static void *perf_event_mmap(int fd)
|
||||
{
|
||||
int mmap_size = perf_mmap_size();
|
||||
void *base;
|
||||
|
||||
base = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
|
||||
if (base == MAP_FAILED) {
|
||||
p_err("event mmap failed: %s\n", strerror(errno));
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return base;
|
||||
}
|
||||
|
||||
static void perf_event_unmap(void *mem)
|
||||
{
|
||||
if (munmap(mem, perf_mmap_size()))
|
||||
fprintf(stderr, "Can't unmap ring memory!\n");
|
||||
}
|
||||
|
||||
static int bpf_perf_event_open(int map_fd, int key, int cpu)
|
||||
{
|
||||
struct perf_event_attr attr = {
|
||||
struct perf_event_attr perf_attr = {
|
||||
.sample_type = PERF_SAMPLE_RAW | PERF_SAMPLE_TIME,
|
||||
.type = PERF_TYPE_SOFTWARE,
|
||||
.config = PERF_COUNT_SW_BPF_OUTPUT,
|
||||
.sample_period = 1,
|
||||
.wakeup_events = 1,
|
||||
};
|
||||
int pmu_fd;
|
||||
|
||||
pmu_fd = sys_perf_event_open(&attr, -1, cpu, -1, 0);
|
||||
if (pmu_fd < 0) {
|
||||
p_err("failed to open perf event %d for CPU %d", key, cpu);
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (bpf_map_update_elem(map_fd, &key, &pmu_fd, BPF_ANY)) {
|
||||
p_err("failed to update map for event %d for CPU %d", key, cpu);
|
||||
goto err_close;
|
||||
}
|
||||
if (ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0)) {
|
||||
p_err("failed to enable event %d for CPU %d", key, cpu);
|
||||
goto err_close;
|
||||
}
|
||||
|
||||
return pmu_fd;
|
||||
|
||||
err_close:
|
||||
close(pmu_fd);
|
||||
return -1;
|
||||
}
|
||||
|
||||
int do_event_pipe(int argc, char **argv)
|
||||
{
|
||||
int i, nfds, map_fd, index = -1, cpu = -1;
|
||||
struct bpf_map_info map_info = {};
|
||||
struct event_ring_info *rings;
|
||||
size_t tmp_buf_sz = 0;
|
||||
void *tmp_buf = NULL;
|
||||
struct pollfd *pfds;
|
||||
struct perf_buffer_raw_opts opts = {};
|
||||
struct event_pipe_ctx ctx = {
|
||||
.all_cpus = true,
|
||||
.cpu = -1,
|
||||
.idx = -1,
|
||||
};
|
||||
struct perf_buffer *pb;
|
||||
__u32 map_info_len;
|
||||
bool do_all = true;
|
||||
int err, map_fd;
|
||||
|
||||
map_info_len = sizeof(map_info);
|
||||
map_fd = map_parse_fd_and_info(&argc, &argv, &map_info, &map_info_len);
|
||||
|
|
@ -205,7 +155,7 @@ int do_event_pipe(int argc, char **argv)
|
|||
char *endptr;
|
||||
|
||||
NEXT_ARG();
|
||||
cpu = strtoul(*argv, &endptr, 0);
|
||||
ctx.cpu = strtoul(*argv, &endptr, 0);
|
||||
if (*endptr) {
|
||||
p_err("can't parse %s as CPU ID", **argv);
|
||||
goto err_close_map;
|
||||
|
|
@ -216,7 +166,7 @@ int do_event_pipe(int argc, char **argv)
|
|||
char *endptr;
|
||||
|
||||
NEXT_ARG();
|
||||
index = strtoul(*argv, &endptr, 0);
|
||||
ctx.idx = strtoul(*argv, &endptr, 0);
|
||||
if (*endptr) {
|
||||
p_err("can't parse %s as index", **argv);
|
||||
goto err_close_map;
|
||||
|
|
@ -228,45 +178,32 @@ int do_event_pipe(int argc, char **argv)
|
|||
goto err_close_map;
|
||||
}
|
||||
|
||||
do_all = false;
|
||||
ctx.all_cpus = false;
|
||||
}
|
||||
|
||||
if (!do_all) {
|
||||
if (index == -1 || cpu == -1) {
|
||||
if (!ctx.all_cpus) {
|
||||
if (ctx.idx == -1 || ctx.cpu == -1) {
|
||||
p_err("cpu and index must be specified together");
|
||||
goto err_close_map;
|
||||
}
|
||||
|
||||
nfds = 1;
|
||||
} else {
|
||||
nfds = min(get_possible_cpus(), map_info.max_entries);
|
||||
cpu = 0;
|
||||
index = 0;
|
||||
ctx.cpu = 0;
|
||||
ctx.idx = 0;
|
||||
}
|
||||
|
||||
rings = calloc(nfds, sizeof(rings[0]));
|
||||
if (!rings)
|
||||
opts.attr = &perf_attr;
|
||||
opts.event_cb = print_bpf_output;
|
||||
opts.ctx = &ctx;
|
||||
opts.cpu_cnt = ctx.all_cpus ? 0 : 1;
|
||||
opts.cpus = &ctx.cpu;
|
||||
opts.map_keys = &ctx.idx;
|
||||
|
||||
pb = perf_buffer__new_raw(map_fd, MMAP_PAGE_CNT, &opts);
|
||||
err = libbpf_get_error(pb);
|
||||
if (err) {
|
||||
p_err("failed to create perf buffer: %s (%d)",
|
||||
strerror(err), err);
|
||||
goto err_close_map;
|
||||
|
||||
pfds = calloc(nfds, sizeof(pfds[0]));
|
||||
if (!pfds)
|
||||
goto err_free_rings;
|
||||
|
||||
for (i = 0; i < nfds; i++) {
|
||||
rings[i].cpu = cpu + i;
|
||||
rings[i].key = index + i;
|
||||
|
||||
rings[i].fd = bpf_perf_event_open(map_fd, rings[i].key,
|
||||
rings[i].cpu);
|
||||
if (rings[i].fd < 0)
|
||||
goto err_close_fds_prev;
|
||||
|
||||
rings[i].mem = perf_event_mmap(rings[i].fd);
|
||||
if (!rings[i].mem)
|
||||
goto err_close_fds_current;
|
||||
|
||||
pfds[i].fd = rings[i].fd;
|
||||
pfds[i].events = POLLIN;
|
||||
}
|
||||
|
||||
signal(SIGINT, int_exit);
|
||||
|
|
@ -277,34 +214,24 @@ int do_event_pipe(int argc, char **argv)
|
|||
jsonw_start_array(json_wtr);
|
||||
|
||||
while (!stop) {
|
||||
poll(pfds, nfds, 200);
|
||||
for (i = 0; i < nfds; i++)
|
||||
perf_event_read(&rings[i], &tmp_buf, &tmp_buf_sz);
|
||||
err = perf_buffer__poll(pb, 200);
|
||||
if (err < 0 && err != -EINTR) {
|
||||
p_err("perf buffer polling failed: %s (%d)",
|
||||
strerror(err), err);
|
||||
goto err_close_pb;
|
||||
}
|
||||
}
|
||||
free(tmp_buf);
|
||||
|
||||
if (json_output)
|
||||
jsonw_end_array(json_wtr);
|
||||
|
||||
for (i = 0; i < nfds; i++) {
|
||||
perf_event_unmap(rings[i].mem);
|
||||
close(rings[i].fd);
|
||||
}
|
||||
free(pfds);
|
||||
free(rings);
|
||||
perf_buffer__free(pb);
|
||||
close(map_fd);
|
||||
|
||||
return 0;
|
||||
|
||||
err_close_fds_prev:
|
||||
while (i--) {
|
||||
perf_event_unmap(rings[i].mem);
|
||||
err_close_fds_current:
|
||||
close(rings[i].fd);
|
||||
}
|
||||
free(pfds);
|
||||
err_free_rings:
|
||||
free(rings);
|
||||
err_close_pb:
|
||||
perf_buffer__free(pb);
|
||||
err_close_map:
|
||||
close(map_fd);
|
||||
return -1;
|
||||
|
|
|
|||
Loading…
Reference in New Issue