libbpf-tools/softirqs.c - platform/external/bcc - Git at Google

 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
 // Copyright (c) 2020 Wenbo Zhang
 //
 // Based on softirq(8) from BCC by Brendan Gregg & Sasha Goldshtein.
 // 15-Aug-2020   Wenbo Zhang   Created this.
 #include <argp.h>
 #include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
 #include <unistd.h>
 #include <bpf/libbpf.h>
 #include <bpf/bpf.h>
 #include "softirqs.h"
 #include "softirqs.skel.h"
 #include "trace_helpers.h"

 struct env {
 	bool distributed;
 	bool nanoseconds;
 	bool count;
 	time_t interval;
 	int times;
 	bool timestamp;
 	bool verbose;
 } env = {
 	.interval = 99999999,
 	.times = 99999999,
 	.count = false,
 };

 static volatile bool exiting;

 const char *argp_program_version = "softirqs 0.1";
 const char *argp_program_bug_address =
 	"https://github.com/iovisor/bcc/tree/master/libbpf-tools";
 const char argp_program_doc[] =
 "Summarize soft irq event time as histograms.\n"
 "\n"
 "USAGE: softirqs [--help] [-T] [-N] [-d] [interval] [count]\n"
 "\n"
 "EXAMPLES:\n"
 "    softirqs            # sum soft irq event time\n"
 "    softirqs -d         # show soft irq event time as histograms\n"
 "    softirqs 1 10       # print 1 second summaries, 10 times\n"
 "    softirqs -NT 1      # 1s summaries, nanoseconds, and timestamps\n";

 static const struct argp_option opts[] = {
 	{ "distributed", 'd', NULL, 0, "Show distributions as histograms" },
 	{ "timestamp", 'T', NULL, 0, "Include timestamp on output" },
 	{ "nanoseconds", 'N', NULL, 0, "Output in nanoseconds" },
 	{ "count", 'C', NULL, 0, "Show event counts with timing" },
 	{ "verbose", 'v', NULL, 0, "Verbose debug output" },
 	{ NULL, 'h', NULL, OPTION_HIDDEN, "Show the full help" },
 	{},
 };

 static error_t parse_arg(int key, char *arg, struct argp_state *state)
 {
 	static int pos_args;

 	switch (key) {
 	case 'h':
 		argp_state_help(state, stderr, ARGP_HELP_STD_HELP);
 		break;
 	case 'v':
 		env.verbose = true;
 		break;
 	case 'd':
 		env.distributed = true;
 		break;
 	case 'N':
 		env.nanoseconds = true;
 		break;
 	case 'T':
 		env.timestamp = true;
 		break;
 	case 'C':
 		env.count = true;
 		break;
 	case ARGP_KEY_ARG:
 		errno = 0;
 		if (pos_args == 0) {
 			env.interval = strtol(arg, NULL, 10);
 			if (errno) {
 				fprintf(stderr, "invalid internal\n");
 				argp_usage(state);
 			}
 		} else if (pos_args == 1) {
 			env.times = strtol(arg, NULL, 10);
 			if (errno) {
 				fprintf(stderr, "invalid times\n");
 				argp_usage(state);
 			}
 		} else {
 			fprintf(stderr,
 				"unrecognized positional argument: %s\n", arg);
 			argp_usage(state);
 		}
 		pos_args++;
 		break;
 	default:
 		return ARGP_ERR_UNKNOWN;
 	}
 	return 0;
 }

 static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args)
 {
 	if (level == LIBBPF_DEBUG && !env.verbose)
 		return 0;
 	return vfprintf(stderr, format, args);
 }

 static void sig_handler(int sig)
 {
 	exiting = true;
 }

 enum {
 	HI_SOFTIRQ = 0,
 	TIMER_SOFTIRQ = 1,
 	NET_TX_SOFTIRQ = 2,
 	NET_RX_SOFTIRQ = 3,
 	BLOCK_SOFTIRQ = 4,
 	IRQ_POLL_SOFTIRQ = 5,
 	TASKLET_SOFTIRQ = 6,
 	SCHED_SOFTIRQ = 7,
 	HRTIMER_SOFTIRQ = 8,
 	RCU_SOFTIRQ = 9,
 	NR_SOFTIRQS = 10,
 };

 static char *vec_names[] = {
 	[HI_SOFTIRQ] = "hi",
 	[TIMER_SOFTIRQ] = "timer",
 	[NET_TX_SOFTIRQ] = "net_tx",
 	[NET_RX_SOFTIRQ] = "net_rx",
 	[BLOCK_SOFTIRQ] = "block",
 	[IRQ_POLL_SOFTIRQ] = "irq_poll",
 	[TASKLET_SOFTIRQ] = "tasklet",
 	[SCHED_SOFTIRQ] = "sched",
 	[HRTIMER_SOFTIRQ] = "hrtimer",
 	[RCU_SOFTIRQ] = "rcu",
 };

 static int print_count(struct softirqs_bpf__bss *bss)
 {
 	const char *units = env.nanoseconds ? "nsecs" : "usecs";
 	__u64 count, time;
 	__u32 vec;

 	printf("%-16s %-6s%-5s  %-11s\n", "SOFTIRQ", "TOTAL_",
 			units, env.count?"TOTAL_count":"");

 	for (vec = 0; vec < NR_SOFTIRQS; vec++) {
 		time = __atomic_exchange_n(&bss->time[vec], 0,
 					__ATOMIC_RELAXED);
 		count = __atomic_exchange_n(&bss->counts[vec], 0,
 					__ATOMIC_RELAXED);
 		if (count > 0) {
 			printf("%-16s %11llu", vec_names[vec], time);
 			if (env.count) {
 				printf("  %11llu", count);
 			}
 			printf("\n");
 		}
 	}

 	return 0;
 }

 static struct hist zero;

 static int print_hist(struct softirqs_bpf__bss *bss)
 {
 	const char *units = env.nanoseconds ? "nsecs" : "usecs";
 	__u32 vec;

 	for (vec = 0; vec < NR_SOFTIRQS; vec++) {
 		struct hist hist = bss->hists[vec];

 		bss->hists[vec] = zero;
 		if (!memcmp(&zero, &hist, sizeof(hist)))
 			continue;
 		printf("softirq = %s\n", vec_names[vec]);
 		print_log2_hist(hist.slots, MAX_SLOTS, units);
 		printf("\n");
 	}

 	return 0;
 }

 int main(int argc, char **argv)
 {
 	static const struct argp argp = {
 		.options = opts,
 		.parser = parse_arg,
 		.doc = argp_program_doc,
 	};
 	struct softirqs_bpf *obj;
 	struct tm *tm;
 	char ts[32];
 	time_t t;
 	int err;

 	err = argp_parse(&argp, argc, argv, 0, NULL, NULL);
 	if (err)
 		return err;

 	libbpf_set_print(libbpf_print_fn);

 	obj = softirqs_bpf__open();
 	if (!obj) {
 		fprintf(stderr, "failed to open BPF object\n");
 		return 1;
 	}

 	if (probe_tp_btf("softirq_entry")) {
 		bpf_program__set_autoload(obj->progs.softirq_entry, false);
 		bpf_program__set_autoload(obj->progs.softirq_exit, false);
 	} else {
 		bpf_program__set_autoload(obj->progs.softirq_entry_btf, false);
 		bpf_program__set_autoload(obj->progs.softirq_exit_btf, false);
 	}

 	/* initialize global data (filtering options) */
 	obj->rodata->targ_dist = env.distributed;
 	obj->rodata->targ_ns = env.nanoseconds;

 	err = softirqs_bpf__load(obj);
 	if (err) {
 		fprintf(stderr, "failed to load BPF object: %d\n", err);
 		goto cleanup;
 	}

 	if (!obj->bss) {
 		fprintf(stderr, "Memory-mapping BPF maps is supported starting from Linux 5.7, please upgrade.\n");
 		goto cleanup;
 	}

 	err = softirqs_bpf__attach(obj);
 	if (err) {
 		fprintf(stderr, "failed to attach BPF programs\n");
 		goto cleanup;
 	}

 	signal(SIGINT, sig_handler);

 	printf("Tracing soft irq event time... Hit Ctrl-C to end.\n");

 	/* main: poll */
 	while (1) {
 		sleep(env.interval);
 		printf("\n");

 		if (env.timestamp) {
 			time(&t);
 			tm = localtime(&t);
 			strftime(ts, sizeof(ts), "%H:%M:%S", tm);
 			printf("%-8s\n", ts);
 		}

 		if (!env.distributed)
 			err = print_count(obj->bss);
 		else
 			err = print_hist(obj->bss);
 		if (err)
 			break;

 		if (exiting || --env.times == 0)
 			break;
 	}

 cleanup:
 	softirqs_bpf__destroy(obj);

 	return err != 0;
 }
	// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
	// Copyright (c) 2020 Wenbo Zhang
	//
	// Based on softirq(8) from BCC by Brendan Gregg & Sasha Goldshtein.
	// 15-Aug-2020 Wenbo Zhang Created this.
	#include <argp.h>
	#include <signal.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <time.h>
	#include <unistd.h>
	#include <bpf/libbpf.h>
	#include <bpf/bpf.h>
	#include "softirqs.h"
	#include "softirqs.skel.h"
	#include "trace_helpers.h"

	struct env {
	bool distributed;
	bool nanoseconds;
	bool count;
	time_t interval;
	int times;
	bool timestamp;
	bool verbose;
	} env = {
	.interval = 99999999,
	.times = 99999999,
	.count = false,
	};

	static volatile bool exiting;

	const char *argp_program_version = "softirqs 0.1";
	const char *argp_program_bug_address =
	"https://github.com/iovisor/bcc/tree/master/libbpf-tools";
	const char argp_program_doc[] =
	"Summarize soft irq event time as histograms.\n"
	"\n"
	"USAGE: softirqs [--help] [-T] [-N] [-d] [interval] [count]\n"
	"\n"
	"EXAMPLES:\n"
	" softirqs # sum soft irq event time\n"
	" softirqs -d # show soft irq event time as histograms\n"
	" softirqs 1 10 # print 1 second summaries, 10 times\n"
	" softirqs -NT 1 # 1s summaries, nanoseconds, and timestamps\n";

	static const struct argp_option opts[] = {
	{ "distributed", 'd', NULL, 0, "Show distributions as histograms" },
	{ "timestamp", 'T', NULL, 0, "Include timestamp on output" },
	{ "nanoseconds", 'N', NULL, 0, "Output in nanoseconds" },
	{ "count", 'C', NULL, 0, "Show event counts with timing" },
	{ "verbose", 'v', NULL, 0, "Verbose debug output" },
	{ NULL, 'h', NULL, OPTION_HIDDEN, "Show the full help" },
	{},
	};

	static error_t parse_arg(int key, char arg, struct argp_state state)
	{
	static int pos_args;

	switch (key) {
	case 'h':
	argp_state_help(state, stderr, ARGP_HELP_STD_HELP);
	break;
	case 'v':
	env.verbose = true;
	break;
	case 'd':
	env.distributed = true;
	break;
	case 'N':
	env.nanoseconds = true;
	break;
	case 'T':
	env.timestamp = true;
	break;
	case 'C':
	env.count = true;
	break;
	case ARGP_KEY_ARG:
	errno = 0;
	if (pos_args == 0) {
	env.interval = strtol(arg, NULL, 10);
	if (errno) {
	fprintf(stderr, "invalid internal\n");
	argp_usage(state);
	}
	} else if (pos_args == 1) {
	env.times = strtol(arg, NULL, 10);
	if (errno) {
	fprintf(stderr, "invalid times\n");
	argp_usage(state);
	}
	} else {
	fprintf(stderr,
	"unrecognized positional argument: %s\n", arg);
	argp_usage(state);
	}
	pos_args++;
	break;
	default:
	return ARGP_ERR_UNKNOWN;
	}
	return 0;
	}

	static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args)
	{
	if (level == LIBBPF_DEBUG && !env.verbose)
	return 0;
	return vfprintf(stderr, format, args);
	}

	static void sig_handler(int sig)
	{
	exiting = true;
	}

	enum {
	HI_SOFTIRQ = 0,
	TIMER_SOFTIRQ = 1,
	NET_TX_SOFTIRQ = 2,
	NET_RX_SOFTIRQ = 3,
	BLOCK_SOFTIRQ = 4,
	IRQ_POLL_SOFTIRQ = 5,
	TASKLET_SOFTIRQ = 6,
	SCHED_SOFTIRQ = 7,
	HRTIMER_SOFTIRQ = 8,
	RCU_SOFTIRQ = 9,
	NR_SOFTIRQS = 10,
	};

	static char *vec_names[] = {
	[HI_SOFTIRQ] = "hi",
	[TIMER_SOFTIRQ] = "timer",
	[NET_TX_SOFTIRQ] = "net_tx",
	[NET_RX_SOFTIRQ] = "net_rx",
	[BLOCK_SOFTIRQ] = "block",
	[IRQ_POLL_SOFTIRQ] = "irq_poll",
	[TASKLET_SOFTIRQ] = "tasklet",
	[SCHED_SOFTIRQ] = "sched",
	[HRTIMER_SOFTIRQ] = "hrtimer",
	[RCU_SOFTIRQ] = "rcu",
	};

	static int print_count(struct softirqs_bpf__bss *bss)
	{
	const char *units = env.nanoseconds ? "nsecs" : "usecs";
	__u64 count, time;
	__u32 vec;

	printf("%-16s %-6s%-5s %-11s\n", "SOFTIRQ", "TOTAL_",
	units, env.count?"TOTAL_count":"");

	for (vec = 0; vec < NR_SOFTIRQS; vec++) {
	time = __atomic_exchange_n(&bss->time[vec], 0,
	__ATOMIC_RELAXED);
	count = __atomic_exchange_n(&bss->counts[vec], 0,
	__ATOMIC_RELAXED);
	if (count > 0) {
	printf("%-16s %11llu", vec_names[vec], time);
	if (env.count) {
	printf(" %11llu", count);
	}
	printf("\n");
	}
	}

	return 0;
	}

	static struct hist zero;

	static int print_hist(struct softirqs_bpf__bss *bss)
	{
	const char *units = env.nanoseconds ? "nsecs" : "usecs";
	__u32 vec;

	for (vec = 0; vec < NR_SOFTIRQS; vec++) {
	struct hist hist = bss->hists[vec];

	bss->hists[vec] = zero;
	if (!memcmp(&zero, &hist, sizeof(hist)))
	continue;
	printf("softirq = %s\n", vec_names[vec]);
	print_log2_hist(hist.slots, MAX_SLOTS, units);
	printf("\n");
	}

	return 0;
	}

	int main(int argc, char **argv)
	{
	static const struct argp argp = {
	.options = opts,
	.parser = parse_arg,
	.doc = argp_program_doc,
	};
	struct softirqs_bpf *obj;
	struct tm *tm;
	char ts[32];
	time_t t;
	int err;

	err = argp_parse(&argp, argc, argv, 0, NULL, NULL);
	if (err)
	return err;

	libbpf_set_print(libbpf_print_fn);

	obj = softirqs_bpf__open();
	if (!obj) {
	fprintf(stderr, "failed to open BPF object\n");
	return 1;
	}

	if (probe_tp_btf("softirq_entry")) {
	bpf_program__set_autoload(obj->progs.softirq_entry, false);
	bpf_program__set_autoload(obj->progs.softirq_exit, false);
	} else {
	bpf_program__set_autoload(obj->progs.softirq_entry_btf, false);
	bpf_program__set_autoload(obj->progs.softirq_exit_btf, false);
	}

	/* initialize global data (filtering options) */
	obj->rodata->targ_dist = env.distributed;
	obj->rodata->targ_ns = env.nanoseconds;

	err = softirqs_bpf__load(obj);
	if (err) {
	fprintf(stderr, "failed to load BPF object: %d\n", err);
	goto cleanup;
	}

	if (!obj->bss) {
	fprintf(stderr, "Memory-mapping BPF maps is supported starting from Linux 5.7, please upgrade.\n");
	goto cleanup;
	}

	err = softirqs_bpf__attach(obj);
	if (err) {
	fprintf(stderr, "failed to attach BPF programs\n");
	goto cleanup;
	}

	signal(SIGINT, sig_handler);

	printf("Tracing soft irq event time... Hit Ctrl-C to end.\n");

	/* main: poll */
	while (1) {
	sleep(env.interval);
	printf("\n");

	if (env.timestamp) {
	time(&t);
	tm = localtime(&t);
	strftime(ts, sizeof(ts), "%H:%M:%S", tm);
	printf("%-8s\n", ts);
	}

	if (!env.distributed)
	err = print_count(obj->bss);
	else
	err = print_hist(obj->bss);
	if (err)
	break;

	if (exiting \|\| --env.times == 0)
	break;
	}

	cleanup:
	softirqs_bpf__destroy(obj);

	return err != 0;
	}