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

 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
 // Copyright (c) 2022 Nicolas Sterchele
 //
 // Based on wakeuptime(8) from BCC by Brendan Gregg
 // XX-Jul-2022 Nicolas Sterchele created this.
 #include <argp.h>
 #include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
 #include <bpf/libbpf.h>
 #include <bpf/bpf.h>
 #include "wakeuptime.h"
 #include "wakeuptime.skel.h"
 #include "trace_helpers.h"
 #include <unistd.h>

 struct env {
 	pid_t pid;
 	bool user_threads_only;
 	bool verbose;
 	int stack_storage_size;
 	int perf_max_stack_depth;
 	__u64 min_block_time;
 	__u64 max_block_time;
 	int duration;
 } env = {
 	.verbose = false,
 	.stack_storage_size = 1024,
 	.perf_max_stack_depth = 127,
 	.min_block_time = 1,
 	.max_block_time = -1,
 	.duration = 99999999,
 };

 const char *argp_program_version = "wakeuptime 0.1";
 const char *argp_program_bug_address =
 	"https://github.com/iovisor/bcc/tree/master/libbpf-tools";
 const char argp_program_doc[] =
 "Summarize sleep to wakeup time by waker kernel stack.\n"
 "\n"
 "USAGE: wakeuptime [-h] [-p PID | -u] [-v] [-m MIN-BLOCK-TIME] "
 "[-M MAX-BLOCK-TIME] ]--perf-max-stack-depth] [--stack-storage-size] [duration]\n"
 "EXAMPLES:\n"
 "	wakeuptime		# trace blocked time with waker stacks\n"
 "	wakeuptime 5		# trace for 5 seconds only\n"
 "	wakeuptime -u		# don't include kernel threads (user only)\n"
 "	wakeuptime -p 185	# trace for PID 185 only\n";

 #define OPT_PERF_MAX_STACK_DEPTH	1 /* --pef-max-stack-depth */
 #define OPT_STACK_STORAGE_SIZE		2 /* --stack-storage-size */

 static const struct argp_option opts[] = {
 	{ "pid", 'p', "PID", 0, "trace this PID only"},
 	{ "verbose", 'v', NULL, 0, "show raw addresses" },
 	{ "user-threads-only", 'u', NULL, 0, "user threads only (no kernel threads)" },
 	{ "perf-max-stack-depth", OPT_PERF_MAX_STACK_DEPTH,
 		"PERF-MAX-STACK-DEPTH", 0, "the limit for both kernel and user stack traces (default 127)" },
 	{ "stack-storage-size", OPT_STACK_STORAGE_SIZE, "STACK-STORAGE-SIZE", 0,
 		"the number of unique stack traces that can be stored and displayed (default 1024)" },
 	{ "min-block-time", 'm', "MIN-BLOCK-TIME", 0,
 		"the amount of time in microseconds over which we store traces (default 1)" },
 	{ "max-block-time", 'M', "MAX-BLOCK-TIME", 0,
 		"the amount of time in microseconds under which we store traces (default U64_MAX)" },
 	{ 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;
 	int pid;

 	switch (key) {
 	case 'h':
 		argp_state_help(state, stderr, ARGP_HELP_STD_HELP);
 		break;
 	case 'v':
 		env.verbose = true;
 		break;
 	case 'u':
 		env.user_threads_only = true;
 		break;
 	case 'p':
 		errno = 0;
 		pid = strtol(arg, NULL, 10);
 		if (errno || pid <= 0) {
 			fprintf(stderr, "Invalid PID: %s\n", arg);
 			argp_usage(state);
 		}
 		env.pid = pid;
 		break;
 	case OPT_PERF_MAX_STACK_DEPTH:
 		errno = 0;
 		env.perf_max_stack_depth = strtol(arg, NULL, 10);
 		if (errno) {
 			fprintf(stderr, "invalid perf max stack depth: %s\n", arg);
 			argp_usage(state);
 		}
 		break;
 	case OPT_STACK_STORAGE_SIZE:
 		errno = 0;
 		env.stack_storage_size = strtol(arg, NULL, 10);
 		if (errno) {
 			fprintf(stderr, "invalid stack storage size: %s\n", arg);
 			argp_usage(state);
 		}
 		break;
 	case 'm':
 		errno = 0;
 		env.min_block_time = strtoll(arg, NULL, 10);
 		if (errno) {
 			fprintf(stderr, "Invalid min block time (in us): %s\n", arg);
 			argp_usage(state);
 		}
 		break;
 	case 'M':
 		errno = 0;
 		env.max_block_time = strtoll(arg, NULL, 10);
 		if (errno) {
 			fprintf(stderr, "Invalid min block time (in us): %s\n", arg);
 			argp_usage(state);
 		}
 		break;
 	case ARGP_KEY_ARG:
 		errno = 0;
 		if (pos_args == 0){
 			env.duration = strtol(arg, NULL, 10);
 			if (errno || env.duration <= 0) {
 				fprintf(stderr, "invalid duration (in s)\n");
 				argp_usage(state);
 			}
 		} else {
 			fprintf(stderr, "Unrecognized positional argument: %s\n", arg);
 			argp_usage(state);
 		}
 		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_int(int signo)
 {
 }

 static void print_map(struct ksyms *ksyms, struct wakeuptime_bpf *obj)
 {
 	struct key_t lookup_key = {}, next_key;
 	int err, i, counts_fd, stack_traces_fd;
 	unsigned long *ip;
 	const struct ksym *ksym;
 	__u64 val;

 	ip = calloc(env.perf_max_stack_depth, sizeof(*ip));
 	if (!ip) {
 		fprintf(stderr, "failed to alloc ip\n");
 		return;
 	}

 	counts_fd = bpf_map__fd(obj->maps.counts);
 	stack_traces_fd = bpf_map__fd(obj->maps.stackmap);

 	while (!bpf_map_get_next_key(counts_fd, &lookup_key, &next_key)){
 		err = bpf_map_lookup_elem(counts_fd, &next_key, &val);
 		if (err < 0) {
 			fprintf(stderr, "failed to lookup info: %d\n", err);
 			free(ip);
 			return;
 		}
 		printf("\n	%-16s %s\n", "target:", next_key.target);
 		lookup_key = next_key;

 		err = bpf_map_lookup_elem(stack_traces_fd, &next_key.w_k_stack_id, ip);
 		if (err < 0) {
 			fprintf(stderr, "missed kernel stack: %d\n", err);
 		}
 		for (i = 0; i < env.perf_max_stack_depth && ip[i]; i++) {
 			ksym = ksyms__map_addr(ksyms, ip[i]);
 			printf("	%-16lx %s\n", ip[i], ksym ? ksym->name: "Unknown");
 		}
 		printf("	%16s %s\n","waker:", next_key.waker);
 		/*to convert val in microseconds*/
 		val /= 1000;
 		printf("	%lld\n", val);
 	}

 	free(ip);
 }

 int main(int argc, char **argv)
 {
 	static const struct argp argp = {
 		.options = opts,
 		.parser = parse_arg,
 		.doc = argp_program_doc,
 	};
 	struct wakeuptime_bpf *obj;
 	struct ksyms *ksyms = NULL;
 	int err;

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

 	if (env.min_block_time >= env.max_block_time) {
 		fprintf(stderr, "min_block_time should be smaller than max_block_time\n");
 		return 1;
 	}

 	if (env.user_threads_only && env.pid > 0) {
 		fprintf(stderr, "use either -u or -p");
 	}

 	libbpf_set_print(libbpf_print_fn);

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

 	obj->rodata->targ_pid = env.pid;
 	obj->rodata->min_block_ns = env.min_block_time * 1000;
 	obj->rodata->max_block_ns = env.max_block_time * 1000;
 	obj->rodata->user_threads_only = env.user_threads_only;

 	bpf_map__set_value_size(obj->maps.stackmap,
 				env.perf_max_stack_depth * sizeof(unsigned long));
 	bpf_map__set_max_entries(obj->maps.stackmap, env.stack_storage_size);

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

 	ksyms = ksyms__load();
 	if (!ksyms) {
 		fprintf(stderr, "failed to load kallsyms\n");
 		goto cleanup;
 	}

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

 	if (signal(SIGINT, sig_int) == SIG_ERR) {
 		fprintf(stderr, "can't set signal handler: %s\n", strerror(errno));
 		err = 1;
 		goto cleanup;
 	}

 	printf("Tracing blocked time (us) by kernel stack\n");
 	sleep(env.duration);
 	print_map(ksyms, obj);

 cleanup:
 	wakeuptime_bpf__destroy(obj);
 	ksyms__free(ksyms);
 	return err != 0;
 }
	// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
	// Copyright (c) 2022 Nicolas Sterchele
	//
	// Based on wakeuptime(8) from BCC by Brendan Gregg
	// XX-Jul-2022 Nicolas Sterchele created this.
	#include <argp.h>
	#include <signal.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <time.h>
	#include <bpf/libbpf.h>
	#include <bpf/bpf.h>
	#include "wakeuptime.h"
	#include "wakeuptime.skel.h"
	#include "trace_helpers.h"
	#include <unistd.h>

	struct env {
	pid_t pid;
	bool user_threads_only;
	bool verbose;
	int stack_storage_size;
	int perf_max_stack_depth;
	__u64 min_block_time;
	__u64 max_block_time;
	int duration;
	} env = {
	.verbose = false,
	.stack_storage_size = 1024,
	.perf_max_stack_depth = 127,
	.min_block_time = 1,
	.max_block_time = -1,
	.duration = 99999999,
	};

	const char *argp_program_version = "wakeuptime 0.1";
	const char *argp_program_bug_address =
	"https://github.com/iovisor/bcc/tree/master/libbpf-tools";
	const char argp_program_doc[] =
	"Summarize sleep to wakeup time by waker kernel stack.\n"
	"\n"
	"USAGE: wakeuptime [-h] [-p PID \| -u] [-v] [-m MIN-BLOCK-TIME] "
	"[-M MAX-BLOCK-TIME] ]--perf-max-stack-depth] [--stack-storage-size] [duration]\n"
	"EXAMPLES:\n"
	" wakeuptime # trace blocked time with waker stacks\n"
	" wakeuptime 5 # trace for 5 seconds only\n"
	" wakeuptime -u # don't include kernel threads (user only)\n"
	" wakeuptime -p 185 # trace for PID 185 only\n";

	#define OPT_PERF_MAX_STACK_DEPTH 1 /* --pef-max-stack-depth */
	#define OPT_STACK_STORAGE_SIZE 2 /* --stack-storage-size */

	static const struct argp_option opts[] = {
	{ "pid", 'p', "PID", 0, "trace this PID only"},
	{ "verbose", 'v', NULL, 0, "show raw addresses" },
	{ "user-threads-only", 'u', NULL, 0, "user threads only (no kernel threads)" },
	{ "perf-max-stack-depth", OPT_PERF_MAX_STACK_DEPTH,
	"PERF-MAX-STACK-DEPTH", 0, "the limit for both kernel and user stack traces (default 127)" },
	{ "stack-storage-size", OPT_STACK_STORAGE_SIZE, "STACK-STORAGE-SIZE", 0,
	"the number of unique stack traces that can be stored and displayed (default 1024)" },
	{ "min-block-time", 'm', "MIN-BLOCK-TIME", 0,
	"the amount of time in microseconds over which we store traces (default 1)" },
	{ "max-block-time", 'M', "MAX-BLOCK-TIME", 0,
	"the amount of time in microseconds under which we store traces (default U64_MAX)" },
	{ 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;
	int pid;

	switch (key) {
	case 'h':
	argp_state_help(state, stderr, ARGP_HELP_STD_HELP);
	break;
	case 'v':
	env.verbose = true;
	break;
	case 'u':
	env.user_threads_only = true;
	break;
	case 'p':
	errno = 0;
	pid = strtol(arg, NULL, 10);
	if (errno \|\| pid <= 0) {
	fprintf(stderr, "Invalid PID: %s\n", arg);
	argp_usage(state);
	}
	env.pid = pid;
	break;
	case OPT_PERF_MAX_STACK_DEPTH:
	errno = 0;
	env.perf_max_stack_depth = strtol(arg, NULL, 10);
	if (errno) {
	fprintf(stderr, "invalid perf max stack depth: %s\n", arg);
	argp_usage(state);
	}
	break;
	case OPT_STACK_STORAGE_SIZE:
	errno = 0;
	env.stack_storage_size = strtol(arg, NULL, 10);
	if (errno) {
	fprintf(stderr, "invalid stack storage size: %s\n", arg);
	argp_usage(state);
	}
	break;
	case 'm':
	errno = 0;
	env.min_block_time = strtoll(arg, NULL, 10);
	if (errno) {
	fprintf(stderr, "Invalid min block time (in us): %s\n", arg);
	argp_usage(state);
	}
	break;
	case 'M':
	errno = 0;
	env.max_block_time = strtoll(arg, NULL, 10);
	if (errno) {
	fprintf(stderr, "Invalid min block time (in us): %s\n", arg);
	argp_usage(state);
	}
	break;
	case ARGP_KEY_ARG:
	errno = 0;
	if (pos_args == 0){
	env.duration = strtol(arg, NULL, 10);
	if (errno \|\| env.duration <= 0) {
	fprintf(stderr, "invalid duration (in s)\n");
	argp_usage(state);
	}
	} else {
	fprintf(stderr, "Unrecognized positional argument: %s\n", arg);
	argp_usage(state);
	}
	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_int(int signo)
	{
	}

	static void print_map(struct ksyms ksyms, struct wakeuptime_bpf obj)
	{
	struct key_t lookup_key = {}, next_key;
	int err, i, counts_fd, stack_traces_fd;
	unsigned long *ip;
	const struct ksym *ksym;
	__u64 val;

	ip = calloc(env.perf_max_stack_depth, sizeof(*ip));
	if (!ip) {
	fprintf(stderr, "failed to alloc ip\n");
	return;
	}

	counts_fd = bpf_map__fd(obj->maps.counts);
	stack_traces_fd = bpf_map__fd(obj->maps.stackmap);

	while (!bpf_map_get_next_key(counts_fd, &lookup_key, &next_key)){
	err = bpf_map_lookup_elem(counts_fd, &next_key, &val);
	if (err < 0) {
	fprintf(stderr, "failed to lookup info: %d\n", err);
	free(ip);
	return;
	}
	printf("\n %-16s %s\n", "target:", next_key.target);
	lookup_key = next_key;

	err = bpf_map_lookup_elem(stack_traces_fd, &next_key.w_k_stack_id, ip);
	if (err < 0) {
	fprintf(stderr, "missed kernel stack: %d\n", err);
	}
	for (i = 0; i < env.perf_max_stack_depth && ip[i]; i++) {
	ksym = ksyms__map_addr(ksyms, ip[i]);
	printf(" %-16lx %s\n", ip[i], ksym ? ksym->name: "Unknown");
	}
	printf(" %16s %s\n","waker:", next_key.waker);
	/to convert val in microseconds/
	val /= 1000;
	printf(" %lld\n", val);
	}

	free(ip);
	}

	int main(int argc, char **argv)
	{
	static const struct argp argp = {
	.options = opts,
	.parser = parse_arg,
	.doc = argp_program_doc,
	};
	struct wakeuptime_bpf *obj;
	struct ksyms *ksyms = NULL;
	int err;

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

	if (env.min_block_time >= env.max_block_time) {
	fprintf(stderr, "min_block_time should be smaller than max_block_time\n");
	return 1;
	}

	if (env.user_threads_only && env.pid > 0) {
	fprintf(stderr, "use either -u or -p");
	}

	libbpf_set_print(libbpf_print_fn);

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

	obj->rodata->targ_pid = env.pid;
	obj->rodata->min_block_ns = env.min_block_time * 1000;
	obj->rodata->max_block_ns = env.max_block_time * 1000;
	obj->rodata->user_threads_only = env.user_threads_only;

	bpf_map__set_value_size(obj->maps.stackmap,
	env.perf_max_stack_depth * sizeof(unsigned long));
	bpf_map__set_max_entries(obj->maps.stackmap, env.stack_storage_size);

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

	ksyms = ksyms__load();
	if (!ksyms) {
	fprintf(stderr, "failed to load kallsyms\n");
	goto cleanup;
	}

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

	if (signal(SIGINT, sig_int) == SIG_ERR) {
	fprintf(stderr, "can't set signal handler: %s\n", strerror(errno));
	err = 1;
	goto cleanup;
	}

	printf("Tracing blocked time (us) by kernel stack\n");
	sleep(env.duration);
	print_map(ksyms, obj);

	cleanup:
	wakeuptime_bpf__destroy(obj);
	ksyms__free(ksyms);
	return err != 0;
	}