* [PATCH v3 bpf-next 1/3] bpftool: introduce "prog profile" command
2020-03-03 19:55 [PATCH v3 bpf-next 0/3] bpftool: introduce prog profile Song Liu
@ 2020-03-03 19:55 ` Song Liu
2020-03-04 10:59 ` Quentin Monnet
2020-03-03 19:55 ` [PATCH v3 bpf-next 2/3] bpftool: Documentation for bpftool prog profile Song Liu
2020-03-03 19:55 ` [PATCH v3 bpf-next 3/3] bpftool: bash completion for "bpftool prog profile" Song Liu
2 siblings, 1 reply; 7+ messages in thread
From: Song Liu @ 2020-03-03 19:55 UTC (permalink / raw)
To: netdev, bpf
Cc: quentin, kernel-team, ast, daniel, arnaldo.melo, jolsa, Song Liu
With fentry/fexit programs, it is possible to profile BPF program with
hardware counters. Introduce bpftool "prog profile", which measures key
metrics of a BPF program.
bpftool prog profile command creates per-cpu perf events. Then it attaches
fentry/fexit programs to the target BPF program. The fentry program saves
perf event value to a map. The fexit program reads the perf event again,
and calculates the difference, which is the instructions/cycles used by
the target program.
Example input and output:
./bpftool prog profile id 337 duration 3 cycles instructions llc_misses
4228 run_cnt
3403698 cycles (84.08%)
3525294 instructions # 1.04 insn per cycle (84.05%)
13 llc_misses # 3.69 LLC misses per million isns (83.50%)
This command measures cycles and instructions for BPF program with id
337 for 3 seconds. The program has triggered 4228 times. The rest of the
output is similar to perf-stat. In this example, the counters were only
counting ~84% of the time because of time multiplexing of perf counters.
Note that, this approach measures cycles and instructions in very small
increments. So the fentry/fexit programs introduce noticeable errors to
the measurement results.
The fentry/fexit programs are generated with BPF skeletons. Therefore, we
build bpftool twice. The first time _bpftool is built without skeletons.
Then, _bpftool is used to generate the skeletons. The second time, bpftool
is built with skeletons.
Signed-off-by: Song Liu <songliubraving@fb.com>
---
tools/bpf/bpftool/Makefile | 18 +
tools/bpf/bpftool/prog.c | 432 +++++++++++++++++++++-
tools/bpf/bpftool/skeleton/profiler.bpf.c | 171 +++++++++
tools/bpf/bpftool/skeleton/profiler.h | 47 +++
tools/scripts/Makefile.include | 1 +
5 files changed, 668 insertions(+), 1 deletion(-)
create mode 100644 tools/bpf/bpftool/skeleton/profiler.bpf.c
create mode 100644 tools/bpf/bpftool/skeleton/profiler.h
diff --git a/tools/bpf/bpftool/Makefile b/tools/bpf/bpftool/Makefile
index c4e810335810..20a90d8450f8 100644
--- a/tools/bpf/bpftool/Makefile
+++ b/tools/bpf/bpftool/Makefile
@@ -59,6 +59,7 @@ LIBS = $(LIBBPF) -lelf -lz
INSTALL ?= install
RM ?= rm -f
+CLANG ?= clang
FEATURE_USER = .bpftool
FEATURE_TESTS = libbfd disassembler-four-args reallocarray zlib
@@ -110,6 +111,22 @@ SRCS += $(BFD_SRCS)
endif
OBJS = $(patsubst %.c,$(OUTPUT)%.o,$(SRCS)) $(OUTPUT)disasm.o
+_OBJS = $(filter-out $(OUTPUT)prog.o,$(OBJS)) $(OUTPUT)_prog.o
+
+$(OUTPUT)_prog.o: prog.c
+ $(QUIET_CC)$(COMPILE.c) -MMD -DBPFTOOL_WITHOUT_SKELETONS -o $@ $<
+
+$(OUTPUT)_bpftool: $(_OBJS) $(LIBBPF)
+ $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(_OBJS) $(LIBS)
+
+skeleton/profiler.bpf.o: skeleton/profiler.bpf.c
+ $(QUIET_CLANG)$(CLANG) -I$(srctree)/tools/lib -g -O2 -target bpf -c $< -o $@
+
+profiler.skel.h: $(OUTPUT)_bpftool skeleton/profiler.bpf.o
+ $(QUIET_GEN)$(OUTPUT)./_bpftool gen skeleton skeleton/profiler.bpf.o > $@
+
+$(OUTPUT)prog.o: prog.c profiler.skel.h
+ $(QUIET_CC)$(COMPILE.c) -MMD -o $@ $<
$(OUTPUT)disasm.o: $(srctree)/kernel/bpf/disasm.c
$(QUIET_CC)$(COMPILE.c) -MMD -o $@ $<
@@ -125,6 +142,7 @@ $(OUTPUT)%.o: %.c
clean: $(LIBBPF)-clean
$(call QUIET_CLEAN, bpftool)
$(Q)$(RM) -- $(OUTPUT)bpftool $(OUTPUT)*.o $(OUTPUT)*.d
+ $(Q)$(RM) -- $(OUTPUT)_bpftool profiler.skel.h skeleton/profiler.bpf.o
$(Q)$(RM) -r -- $(OUTPUT)libbpf/
$(call QUIET_CLEAN, core-gen)
$(Q)$(RM) -- $(OUTPUT)FEATURE-DUMP.bpftool
diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index 1996e67a2f00..261f13ce3282 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -4,6 +4,7 @@
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
+#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
@@ -11,10 +12,13 @@
#include <time.h>
#include <unistd.h>
#include <net/if.h>
+#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
+#include <sys/syscall.h>
#include <linux/err.h>
+#include <linux/perf_event.h>
#include <linux/sizes.h>
#include <bpf/bpf.h>
@@ -1537,6 +1541,429 @@ static int do_loadall(int argc, char **argv)
return load_with_options(argc, argv, false);
}
+#ifdef BPFTOOL_WITHOUT_SKELETONS
+
+static int do_profile(int argc, char **argv)
+{
+ return 0;
+}
+
+#else /* BPFTOOL_WITHOUT_SKELETONS */
+
+#include "profiler.skel.h"
+
+#define SAMPLE_PERIOD 0x7fffffffffffffffULL
+struct profile_metric {
+ const char *name;
+ struct bpf_perf_event_value val;
+ struct perf_event_attr attr;
+ bool selected;
+
+ /* calculate ratios like instructions per cycle */
+ const int ratio_metric; /* 0 for N/A, 1 for index 0 (cycles) */
+ const char *ratio_desc;
+ const float ratio_mul;
+} metrics[] = {
+ {
+ .name = "cycles",
+ .attr = {
+ .sample_period = SAMPLE_PERIOD,
+ .type = PERF_TYPE_HARDWARE,
+ .config = PERF_COUNT_HW_CPU_CYCLES,
+ },
+ },
+ {
+ .name = "instructions",
+ .attr = {
+ .sample_period = SAMPLE_PERIOD,
+ .type = PERF_TYPE_HARDWARE,
+ .config = PERF_COUNT_HW_INSTRUCTIONS,
+ },
+ .ratio_metric = 1,
+ .ratio_desc = "insns per cycle",
+ .ratio_mul = 1.0,
+ },
+ {
+ .name = "l1d_loads",
+ .attr = {
+ .sample_period = SAMPLE_PERIOD,
+ .type = PERF_TYPE_HW_CACHE,
+ .config =
+ PERF_COUNT_HW_CACHE_L1D |
+ (PERF_COUNT_HW_CACHE_OP_READ << 8) |
+ (PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16),
+ },
+ },
+ {
+ .name = "llc_misses",
+ .attr = {
+ .sample_period = SAMPLE_PERIOD,
+ .type = PERF_TYPE_HW_CACHE,
+ .config =
+ PERF_COUNT_HW_CACHE_LL |
+ (PERF_COUNT_HW_CACHE_OP_READ << 8) |
+ (PERF_COUNT_HW_CACHE_RESULT_MISS << 16),
+ },
+ .ratio_metric = 2,
+ .ratio_desc = "LLC misses per million insns",
+ .ratio_mul = 1e6,
+ },
+};
+
+static __u64 profile_total_count;
+
+#define MAX_NUM_PROFILE_METRICS 4
+
+static int profile_parse_metrics(int argc, char **argv)
+{
+ unsigned int metric_cnt;
+ int selected_cnt = 0;
+ unsigned int i;
+
+ metric_cnt = sizeof(metrics) / sizeof(struct profile_metric);
+
+ while (argc > 0) {
+ for (i = 0; i < metric_cnt; i++) {
+ if (is_prefix(argv[0], metrics[i].name)) {
+ if (!metrics[i].selected)
+ selected_cnt++;
+ metrics[i].selected = true;
+ break;
+ }
+ }
+ if (i == metric_cnt) {
+ p_err("unknown metric %s", argv[0]);
+ return -1;
+ }
+ NEXT_ARG();
+ }
+ if (selected_cnt > MAX_NUM_PROFILE_METRICS) {
+ p_err("too many (%d) metrics, please specify no more than %d metrics at at time",
+ selected_cnt, MAX_NUM_PROFILE_METRICS);
+ return -1;
+ }
+ return selected_cnt;
+}
+
+static void profile_read_values(struct profiler_bpf *obj)
+{
+ __u32 m, cpu, num_cpu = obj->rodata->num_cpu;
+ int reading_map_fd, count_map_fd;
+ __u64 counts[num_cpu];
+ __u32 key = 0;
+ int err;
+
+ reading_map_fd = bpf_map__fd(obj->maps.accum_readings);
+ count_map_fd = bpf_map__fd(obj->maps.counts);
+ if (reading_map_fd < 0 || count_map_fd < 0) {
+ p_err("failed to get fd for map");
+ return;
+ }
+
+ err = bpf_map_lookup_elem(count_map_fd, &key, counts);
+ if (err) {
+ p_err("failed to read count_map: %s", strerror(errno));
+ return;
+ }
+
+ profile_total_count = 0;
+ for (cpu = 0; cpu < num_cpu; cpu++)
+ profile_total_count += counts[cpu];
+
+ for (m = 0; m < ARRAY_SIZE(metrics); m++) {
+ struct bpf_perf_event_value values[num_cpu];
+
+ if (!metrics[m].selected)
+ continue;
+
+ err = bpf_map_lookup_elem(reading_map_fd, &key, values);
+ if (err) {
+ p_err("failed to read reading_map: %s",
+ strerror(errno));
+ return;
+ }
+ for (cpu = 0; cpu < num_cpu; cpu++) {
+ metrics[m].val.counter += values[cpu].counter;
+ metrics[m].val.enabled += values[cpu].enabled;
+ metrics[m].val.running += values[cpu].running;
+ }
+ key++;
+ }
+}
+
+static void profile_print_readings_json(void)
+{
+ __u32 m;
+
+ jsonw_start_array(json_wtr);
+ for (m = 0; m < ARRAY_SIZE(metrics); m++) {
+ if (!metrics[m].selected)
+ continue;
+ jsonw_start_object(json_wtr);
+ jsonw_string_field(json_wtr, "metric", metrics[m].name);
+ jsonw_lluint_field(json_wtr, "run_cnt", profile_total_count);
+ jsonw_lluint_field(json_wtr, "value", metrics[m].val.counter);
+ jsonw_lluint_field(json_wtr, "enabled", metrics[m].val.enabled);
+ jsonw_lluint_field(json_wtr, "running", metrics[m].val.running);
+
+ jsonw_end_object(json_wtr);
+ }
+ jsonw_end_array(json_wtr);
+}
+
+static void profile_print_readings_plain(void)
+{
+ __u32 m;
+
+ printf("\n%18llu %-20s\n", profile_total_count, "run_cnt");
+ for (m = 0; m < ARRAY_SIZE(metrics); m++) {
+ struct bpf_perf_event_value *val = &metrics[m].val;
+ int r;
+
+ if (!metrics[m].selected)
+ continue;
+ printf("%18llu %-20s", val->counter, metrics[m].name);
+
+ r = metrics[m].ratio_metric - 1;
+ if (r >= 0 && metrics[r].selected &&
+ metrics[r].val.counter > 0) {
+ printf("# %8.2f %-30s",
+ val->counter * metrics[m].ratio_mul /
+ metrics[r].val.counter,
+ metrics[m].ratio_desc);
+ } else {
+ printf("%-41s", "");
+ }
+
+ if (val->enabled > val->running)
+ printf("(%4.2f%%)",
+ val->running * 100.0 / val->enabled);
+ printf("\n");
+ }
+}
+
+static void profile_print_readings(void)
+{
+ if (json_output)
+ profile_print_readings_json();
+ else
+ profile_print_readings_plain();
+}
+
+static char *profile_target_name(int tgt_fd)
+{
+ struct bpf_prog_info_linear *info_linear;
+ struct bpf_func_info *func_info;
+ const struct btf_type *t;
+ char *name = NULL;
+ struct btf *btf;
+
+ info_linear = bpf_program__get_prog_info_linear(
+ tgt_fd, 1UL << BPF_PROG_INFO_FUNC_INFO);
+ if (IS_ERR_OR_NULL(info_linear)) {
+ p_err("failed to get info_linear for prog FD %d", tgt_fd);
+ return NULL;
+ }
+
+ if (info_linear->info.btf_id == 0 ||
+ btf__get_from_id(info_linear->info.btf_id, &btf)) {
+ p_err("prog FD %d doesn't have valid btf", tgt_fd);
+ goto out;
+ }
+
+ func_info = (struct bpf_func_info *)(info_linear->info.func_info);
+ t = btf__type_by_id(btf, func_info[0].type_id);
+ if (!t) {
+ p_err("btf %d doesn't have type %d",
+ info_linear->info.btf_id, func_info[0].type_id);
+ goto out;
+ }
+ name = strdup(btf__name_by_offset(btf, t->name_off));
+out:
+ free(info_linear);
+ return name;
+}
+
+static struct profiler_bpf *profile_obj;
+static int profile_tgt_fd = -1;
+static char *profile_tgt_name;
+static int *profile_perf_events;
+static int profile_perf_event_cnt;
+
+static void profile_close_perf_events(struct profiler_bpf *obj)
+{
+ int i;
+
+ for (i = profile_perf_event_cnt - 1; i >= 0; i--)
+ close(profile_perf_events[i]);
+
+ free(profile_perf_events);
+ profile_perf_event_cnt = 0;
+}
+
+static int profile_open_perf_events(struct profiler_bpf *obj)
+{
+ unsigned int cpu, m;
+ int map_fd, pmu_fd;
+
+ profile_perf_events = calloc(
+ sizeof(int), obj->rodata->num_cpu * obj->rodata->num_metric);
+ if (!profile_perf_events) {
+ p_err("failed to allocate memory for perf_event array: %s",
+ strerror(errno));
+ return -1;
+ }
+ map_fd = bpf_map__fd(obj->maps.events);
+ if (map_fd < 0) {
+ p_err("failed to get fd for events map");
+ return -1;
+ }
+
+ for (m = 0; m < ARRAY_SIZE(metrics); m++) {
+ if (!metrics[m].selected)
+ continue;
+ for (cpu = 0; cpu < obj->rodata->num_cpu; cpu++) {
+ pmu_fd = syscall(__NR_perf_event_open, &metrics[m].attr,
+ -1/*pid*/, cpu, -1/*group_fd*/, 0);
+ if (pmu_fd < 0 ||
+ bpf_map_update_elem(map_fd, &profile_perf_event_cnt,
+ &pmu_fd, BPF_ANY) ||
+ ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0)) {
+ p_err("failed to create event %s on cpu %d",
+ metrics[m].name, cpu);
+ goto err;
+ }
+ profile_perf_events[profile_perf_event_cnt++] = pmu_fd;
+ }
+ }
+ return 0;
+err:
+ profile_close_perf_events(profile_obj);
+ return -1;
+}
+
+static void profile_print_and_cleanup(void)
+{
+ profile_close_perf_events(profile_obj);
+ profile_read_values(profile_obj);
+ profile_print_readings();
+ profiler_bpf__destroy(profile_obj);
+
+ close(profile_tgt_fd);
+ free(profile_tgt_name);
+}
+
+static void int_exit(int signo)
+{
+ profile_print_and_cleanup();
+ exit(0);
+}
+
+static int do_profile(int argc, char **argv)
+{
+ int num_metric, num_cpu, err = -1;
+ struct bpf_program *prog;
+ unsigned long duration;
+ char *endptr;
+
+ /* we at least need two args for the prog and one metric */
+ if (!REQ_ARGS(3))
+ return -EINVAL;
+
+ /* parse target fd */
+ profile_tgt_fd = prog_parse_fd(&argc, &argv);
+ if (profile_tgt_fd < 0) {
+ p_err("failed to parse fd");
+ return -1;
+ }
+
+ /* parse profiling optional duration */
+ if (argc > 2 && is_prefix(argv[0], "duration")) {
+ NEXT_ARG();
+ duration = strtoul(*argv, &endptr, 0);
+ if (*endptr)
+ usage();
+ NEXT_ARG();
+ } else {
+ duration = UINT_MAX;
+ }
+
+ num_metric = profile_parse_metrics(argc, argv);
+ if (num_metric <= 0)
+ goto out;
+
+ num_cpu = libbpf_num_possible_cpus();
+ if (num_cpu <= 0) {
+ p_err("failed to identify number of CPUs");
+ goto out;
+ }
+
+ profile_obj = profiler_bpf__open();
+ if (!profile_obj) {
+ p_err("failed to open and/or load BPF object");
+ goto out;
+ }
+
+ profile_obj->rodata->num_cpu = num_cpu;
+ profile_obj->rodata->num_metric = num_metric;
+
+ /* adjust map sizes */
+ bpf_map__resize(profile_obj->maps.events, num_metric * num_cpu);
+ bpf_map__resize(profile_obj->maps.fentry_readings, num_metric);
+ bpf_map__resize(profile_obj->maps.accum_readings, num_metric);
+ bpf_map__resize(profile_obj->maps.counts, 1);
+
+ /* change target name */
+ profile_tgt_name = profile_target_name(profile_tgt_fd);
+ if (!profile_tgt_name) {
+ p_err("failed to load target function name");
+ goto out;
+ }
+
+ bpf_object__for_each_program(prog, profile_obj->obj) {
+ err = bpf_program__set_attach_target(prog, profile_tgt_fd,
+ profile_tgt_name);
+ if (err) {
+ p_err("failed to set attach target\n");
+ goto out;
+ }
+ }
+
+ set_max_rlimit();
+ err = profiler_bpf__load(profile_obj);
+ if (err) {
+ p_err("failed to load profile_obj");
+ goto out;
+ }
+
+ err = profile_open_perf_events(profile_obj);
+ if (err) {
+ p_err("failed to open perf events");
+ goto out;
+ }
+
+ err = profiler_bpf__attach(profile_obj);
+ if (err) {
+ p_err("failed to attach profile_obj");
+ goto out;
+ }
+ signal(SIGINT, int_exit);
+
+ sleep(duration);
+ profile_print_and_cleanup();
+ return 0;
+
+out:
+ profile_close_perf_events(profile_obj);
+ if (profile_obj)
+ profiler_bpf__destroy(profile_obj);
+ close(profile_tgt_fd);
+ free(profile_tgt_name);
+ return err;
+}
+
+#endif /* BPFTOOL_WITHOUT_SKELETONS */
+
static int do_help(int argc, char **argv)
{
if (json_output) {
@@ -1560,6 +1987,7 @@ static int do_help(int argc, char **argv)
" [data_out FILE [data_size_out L]] \\\n"
" [ctx_in FILE [ctx_out FILE [ctx_size_out M]]] \\\n"
" [repeat N]\n"
+ " %s %s profile PROG [duration DURATION] METRICs\n"
" %s %s tracelog\n"
" %s %s help\n"
"\n"
@@ -1577,12 +2005,13 @@ static int do_help(int argc, char **argv)
" struct_ops | fentry | fexit | freplace }\n"
" ATTACH_TYPE := { msg_verdict | stream_verdict | stream_parser |\n"
" flow_dissector }\n"
+ " METRIC := { cycles | instructions | l1d_loads | llc_misses }\n"
" " HELP_SPEC_OPTIONS "\n"
"",
bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
- bin_name, argv[-2]);
+ bin_name, argv[-2], bin_name, argv[-2]);
return 0;
}
@@ -1599,6 +2028,7 @@ static const struct cmd cmds[] = {
{ "detach", do_detach },
{ "tracelog", do_tracelog },
{ "run", do_run },
+ { "profile", do_profile },
{ 0 }
};
diff --git a/tools/bpf/bpftool/skeleton/profiler.bpf.c b/tools/bpf/bpftool/skeleton/profiler.bpf.c
new file mode 100644
index 000000000000..20594ccb393d
--- /dev/null
+++ b/tools/bpf/bpftool/skeleton/profiler.bpf.c
@@ -0,0 +1,171 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2020 Facebook
+#include "profiler.h"
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+
+#define ___bpf_concat(a, b) a ## b
+#define ___bpf_apply(fn, n) ___bpf_concat(fn, n)
+#define ___bpf_nth(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _a, _b, _c, N, ...) N
+#define ___bpf_narg(...) \
+ ___bpf_nth(_, ##__VA_ARGS__, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
+#define ___bpf_empty(...) \
+ ___bpf_nth(_, ##__VA_ARGS__, N, N, N, N, N, N, N, N, N, N, 0)
+
+#define ___bpf_ctx_cast0() ctx
+#define ___bpf_ctx_cast1(x) ___bpf_ctx_cast0(), (void *)ctx[0]
+#define ___bpf_ctx_cast2(x, args...) ___bpf_ctx_cast1(args), (void *)ctx[1]
+#define ___bpf_ctx_cast3(x, args...) ___bpf_ctx_cast2(args), (void *)ctx[2]
+#define ___bpf_ctx_cast4(x, args...) ___bpf_ctx_cast3(args), (void *)ctx[3]
+#define ___bpf_ctx_cast5(x, args...) ___bpf_ctx_cast4(args), (void *)ctx[4]
+#define ___bpf_ctx_cast6(x, args...) ___bpf_ctx_cast5(args), (void *)ctx[5]
+#define ___bpf_ctx_cast7(x, args...) ___bpf_ctx_cast6(args), (void *)ctx[6]
+#define ___bpf_ctx_cast8(x, args...) ___bpf_ctx_cast7(args), (void *)ctx[7]
+#define ___bpf_ctx_cast9(x, args...) ___bpf_ctx_cast8(args), (void *)ctx[8]
+#define ___bpf_ctx_cast10(x, args...) ___bpf_ctx_cast9(args), (void *)ctx[9]
+#define ___bpf_ctx_cast11(x, args...) ___bpf_ctx_cast10(args), (void *)ctx[10]
+#define ___bpf_ctx_cast12(x, args...) ___bpf_ctx_cast11(args), (void *)ctx[11]
+#define ___bpf_ctx_cast(args...) \
+ ___bpf_apply(___bpf_ctx_cast, ___bpf_narg(args))(args)
+
+/*
+ * BPF_PROG is a convenience wrapper for generic tp_btf/fentry/fexit and
+ * similar kinds of BPF programs, that accept input arguments as a single
+ * pointer to untyped u64 array, where each u64 can actually be a typed
+ * pointer or integer of different size. Instead of requring user to write
+ * manual casts and work with array elements by index, BPF_PROG macro
+ * allows user to declare a list of named and typed input arguments in the
+ * same syntax as for normal C function. All the casting is hidden and
+ * performed transparently, while user code can just assume working with
+ * function arguments of specified type and name.
+ *
+ * Original raw context argument is preserved as well as 'ctx' argument.
+ * This is useful when using BPF helpers that expect original context
+ * as one of the parameters (e.g., for bpf_perf_event_output()).
+ */
+#define BPF_PROG(name, args...) \
+name(unsigned long long *ctx); \
+static __always_inline typeof(name(0)) \
+____##name(unsigned long long *ctx, ##args); \
+typeof(name(0)) name(unsigned long long *ctx) \
+{ \
+ _Pragma("GCC diagnostic push") \
+ _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \
+ return ____##name(___bpf_ctx_cast(args)); \
+ _Pragma("GCC diagnostic pop") \
+} \
+static __always_inline typeof(name(0)) \
+____##name(unsigned long long *ctx, ##args)
+
+/* map of perf event fds, num_cpu * num_metric entries */
+struct {
+ __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
+ __uint(key_size, sizeof(u32));
+ __uint(value_size, sizeof(int));
+} events SEC(".maps");
+
+/* readings at fentry */
+struct {
+ __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
+ __uint(key_size, sizeof(u32));
+ __uint(value_size, sizeof(struct bpf_perf_event_value));
+} fentry_readings SEC(".maps");
+
+/* accumulated readings */
+struct {
+ __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
+ __uint(key_size, sizeof(u32));
+ __uint(value_size, sizeof(struct bpf_perf_event_value));
+} accum_readings SEC(".maps");
+
+/* sample counts, one per cpu */
+struct {
+ __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
+ __uint(key_size, sizeof(u32));
+ __uint(value_size, sizeof(u64));
+} counts SEC(".maps");
+
+const volatile __u32 num_cpu = 1;
+const volatile __u32 num_metric = 1;
+#define MAX_NUM_MATRICS 4
+
+SEC("fentry/XXX")
+int BPF_PROG(fentry_XXX)
+{
+ struct bpf_perf_event_value *ptrs[MAX_NUM_MATRICS];
+ u32 key = bpf_get_smp_processor_id();
+ u32 i;
+
+ /* look up before reading, to reduce error */
+ for (i = 0; i < num_metric && i < MAX_NUM_MATRICS; i++) {
+ u32 flag = i;
+
+ ptrs[i] = bpf_map_lookup_elem(&fentry_readings, &flag);
+ if (!ptrs[i])
+ return 0;
+ }
+
+ for (i = 0; i < num_metric && i < MAX_NUM_MATRICS; i++) {
+ struct bpf_perf_event_value reading;
+ int err;
+
+ err = bpf_perf_event_read_value(&events, key, &reading,
+ sizeof(reading));
+ if (err)
+ return 0;
+ *(ptrs[i]) = reading;
+ key += num_cpu;
+ }
+
+ return 0;
+}
+
+static inline void
+fexit_update_maps(u32 id, struct bpf_perf_event_value *after)
+{
+ struct bpf_perf_event_value *before, diff, *accum;
+
+ before = bpf_map_lookup_elem(&fentry_readings, &id);
+ /* only account samples with a valid fentry_reading */
+ if (before && before->counter) {
+ struct bpf_perf_event_value *accum;
+
+ diff.counter = after->counter - before->counter;
+ diff.enabled = after->enabled - before->enabled;
+ diff.running = after->running - before->running;
+
+ accum = bpf_map_lookup_elem(&accum_readings, &id);
+ if (accum) {
+ accum->counter += diff.counter;
+ accum->enabled += diff.enabled;
+ accum->running += diff.running;
+ }
+ }
+}
+
+SEC("fexit/XXX")
+int BPF_PROG(fexit_XXX)
+{
+ struct bpf_perf_event_value readings[MAX_NUM_MATRICS];
+ u32 cpu = bpf_get_smp_processor_id();
+ u32 i, one = 1, zero = 0;
+ int err;
+ u64 *count;
+
+ /* read all events before updating the maps, to reduce error */
+ for (i = 0; i < num_metric && i < MAX_NUM_MATRICS; i++) {
+ err = bpf_perf_event_read_value(&events, cpu + i * num_cpu,
+ readings + i, sizeof(*readings));
+ if (err)
+ return 0;
+ }
+ count = bpf_map_lookup_elem(&counts, &zero);
+ if (count) {
+ *count += 1;
+ for (i = 0; i < num_metric && i < MAX_NUM_MATRICS; i++)
+ fexit_update_maps(i, &readings[i]);
+ }
+ return 0;
+}
+
+char LICENSE[] SEC("license") = "GPL";
diff --git a/tools/bpf/bpftool/skeleton/profiler.h b/tools/bpf/bpftool/skeleton/profiler.h
new file mode 100644
index 000000000000..e03b53eae767
--- /dev/null
+++ b/tools/bpf/bpftool/skeleton/profiler.h
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
+#ifndef __PROFILER_H
+#define __PROFILER_H
+
+/* useful typedefs from vmlinux.h */
+
+typedef signed char __s8;
+typedef unsigned char __u8;
+typedef short int __s16;
+typedef short unsigned int __u16;
+typedef int __s32;
+typedef unsigned int __u32;
+typedef long long int __s64;
+typedef long long unsigned int __u64;
+
+typedef __s8 s8;
+typedef __u8 u8;
+typedef __s16 s16;
+typedef __u16 u16;
+typedef __s32 s32;
+typedef __u32 u32;
+typedef __s64 s64;
+typedef __u64 u64;
+
+enum {
+ false = 0,
+ true = 1,
+};
+
+#ifdef __CHECKER__
+#define __bitwise__ __attribute__((bitwise))
+#else
+#define __bitwise__
+#endif
+#define __bitwise __bitwise__
+
+typedef __u16 __bitwise __le16;
+typedef __u16 __bitwise __be16;
+typedef __u32 __bitwise __le32;
+typedef __u32 __bitwise __be32;
+typedef __u64 __bitwise __le64;
+typedef __u64 __bitwise __be64;
+
+typedef __u16 __bitwise __sum16;
+typedef __u32 __bitwise __wsum;
+
+#endif /* __PROFILER_H */
diff --git a/tools/scripts/Makefile.include b/tools/scripts/Makefile.include
index ded7a950dc40..59f31f01cb93 100644
--- a/tools/scripts/Makefile.include
+++ b/tools/scripts/Makefile.include
@@ -106,6 +106,7 @@ ifneq ($(silent),1)
ifneq ($(V),1)
QUIET_CC = @echo ' CC '$@;
QUIET_CC_FPIC = @echo ' CC FPIC '$@;
+ QUIET_CLANG = @echo ' CLANG '$@;
QUIET_AR = @echo ' AR '$@;
QUIET_LINK = @echo ' LINK '$@;
QUIET_MKDIR = @echo ' MKDIR '$@;
--
2.17.1
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