tools/perf/util/print-events.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 #include <dirent.h>
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <fcntl.h>
 #include <sys/param.h>
 #include <unistd.h>

 #include <api/fs/tracing_path.h>
 #include <linux/stddef.h>
 #include <linux/perf_event.h>
 #include <linux/zalloc.h>
 #include <subcmd/pager.h>

 #include "build-id.h"
 #include "debug.h"
 #include "evsel.h"
 #include "metricgroup.h"
 #include "parse-events.h"
 #include "pmu.h"
 #include "print-events.h"
 #include "probe-file.h"
 #include "string2.h"
 #include "strlist.h"
 #include "tracepoint.h"
 #include "pfm.h"
 #include "pmu-hybrid.h"

 #define MAX_NAME_LEN 100

 /** Strings corresponding to enum perf_type_id. */
 static const char * const event_type_descriptors[] = {
 	"Hardware event",
 	"Software event",
 	"Tracepoint event",
 	"Hardware cache event",
 	"Raw hardware event descriptor",
 	"Hardware breakpoint",
 };

 static const struct event_symbol event_symbols_tool[PERF_TOOL_MAX] = {
 	[PERF_TOOL_DURATION_TIME] = {
 		.symbol = "duration_time",
 		.alias  = "",
 	},
 	[PERF_TOOL_USER_TIME] = {
 		.symbol = "user_time",
 		.alias  = "",
 	},
 	[PERF_TOOL_SYSTEM_TIME] = {
 		.symbol = "system_time",
 		.alias  = "",
 	},
 };

 /*
  * Print the events from <debugfs_mount_point>/tracing/events
  */
 void print_tracepoint_events(const struct print_callbacks *print_cb __maybe_unused, void *print_state __maybe_unused)
 {
 	char *events_path = get_tracing_file("events");
 	int events_fd = open(events_path, O_PATH);

 	put_tracing_file(events_path);
 	if (events_fd < 0) {
 		printf("Error: failed to open tracing events directory\n");
 		return;
 	}

 #ifdef HAVE_SCANDIRAT_SUPPORT
 {
 	struct dirent **sys_namelist = NULL;
 	int sys_items = tracing_events__scandir_alphasort(&sys_namelist);

 	for (int i = 0; i < sys_items; i++) {
 		struct dirent *sys_dirent = sys_namelist[i];
 		struct dirent **evt_namelist = NULL;
 		int dir_fd;
 		int evt_items;

 		if (sys_dirent->d_type != DT_DIR ||
 		    !strcmp(sys_dirent->d_name, ".") ||
 		    !strcmp(sys_dirent->d_name, ".."))
 			goto next_sys;

 		dir_fd = openat(events_fd, sys_dirent->d_name, O_PATH);
 		if (dir_fd < 0)
 			goto next_sys;

 		evt_items = scandirat(events_fd, sys_dirent->d_name, &evt_namelist, NULL, alphasort);
 		for (int j = 0; j < evt_items; j++) {
 			struct dirent *evt_dirent = evt_namelist[j];
 			char evt_path[MAXPATHLEN];
 			int evt_fd;

 			if (evt_dirent->d_type != DT_DIR ||
 			    !strcmp(evt_dirent->d_name, ".") ||
 			    !strcmp(evt_dirent->d_name, ".."))
 				goto next_evt;

 			snprintf(evt_path, sizeof(evt_path), "%s/id", evt_dirent->d_name);
 			evt_fd = openat(dir_fd, evt_path, O_RDONLY);
 			if (evt_fd < 0)
 				goto next_evt;
 			close(evt_fd);

 			snprintf(evt_path, MAXPATHLEN, "%s:%s",
 				 sys_dirent->d_name, evt_dirent->d_name);
 			print_cb->print_event(print_state,
 					/*topic=*/NULL,
 					/*pmu_name=*/NULL,
 					evt_path,
 					/*event_alias=*/NULL,
 					/*scale_unit=*/NULL,
 					/*deprecated=*/false,
 					"Tracepoint event",
 					/*desc=*/NULL,
 					/*long_desc=*/NULL,
 					/*encoding_desc=*/NULL);
 next_evt:
 			free(evt_namelist[j]);
 		}
 		close(dir_fd);
 		free(evt_namelist);
 next_sys:
 		free(sys_namelist[i]);
 	}

 	free(sys_namelist);
 }
 #else
 	printf("\nWARNING: Your libc doesn't have the scandirat function, please ask its maintainers to implement it.\n"
 	       "         As a rough fallback, please do 'ls %s' to see the available tracepoint events.\n", events_path);
 #endif
 	close(events_fd);
 }

 void print_sdt_events(const struct print_callbacks *print_cb, void *print_state)
 {
 	struct strlist *bidlist, *sdtlist;
 	struct str_node *bid_nd, *sdt_name, *next_sdt_name;
 	const char *last_sdt_name = NULL;

 	/*
 	 * The implicitly sorted sdtlist will hold the tracepoint name followed
 	 * by @<buildid>. If the tracepoint name is unique (determined by
 	 * looking at the adjacent nodes) the @<buildid> is dropped otherwise
 	 * the executable path and buildid are added to the name.
 	 */
 	sdtlist = strlist__new(NULL, NULL);
 	if (!sdtlist) {
 		pr_debug("Failed to allocate new strlist for SDT\n");
 		return;
 	}
 	bidlist = build_id_cache__list_all(true);
 	if (!bidlist) {
 		pr_debug("Failed to get buildids: %d\n", errno);
 		return;
 	}
 	strlist__for_each_entry(bid_nd, bidlist) {
 		struct probe_cache *pcache;
 		struct probe_cache_entry *ent;

 		pcache = probe_cache__new(bid_nd->s, NULL);
 		if (!pcache)
 			continue;
 		list_for_each_entry(ent, &pcache->entries, node) {
 			char buf[1024];

 			snprintf(buf, sizeof(buf), "%s:%s@%s",
 				 ent->pev.group, ent->pev.event, bid_nd->s);
 			strlist__add(sdtlist, buf);
 		}
 		probe_cache__delete(pcache);
 	}
 	strlist__delete(bidlist);

 	strlist__for_each_entry(sdt_name, sdtlist) {
 		bool show_detail = false;
 		char *bid = strchr(sdt_name->s, '@');
 		char *evt_name = NULL;

 		if (bid)
 			*(bid++) = '\0';

 		if (last_sdt_name && !strcmp(last_sdt_name, sdt_name->s)) {
 			show_detail = true;
 		} else {
 			next_sdt_name = strlist__next(sdt_name);
 			if (next_sdt_name) {
 				char *bid2 = strchr(next_sdt_name->s, '@');

 				if (bid2)
 					*bid2 = '\0';
 				if (strcmp(sdt_name->s, next_sdt_name->s) == 0)
 					show_detail = true;
 				if (bid2)
 					*bid2 = '@';
 			}
 		}
 		last_sdt_name = sdt_name->s;

 		if (show_detail) {
 			char *path = build_id_cache__origname(bid);

 			if (path) {
 				if (asprintf(&evt_name, "%s@%s(%.12s)", sdt_name->s, path, bid) < 0)
 					evt_name = NULL;
 				free(path);
 			}
 		}
 		print_cb->print_event(print_state,
 				/*topic=*/NULL,
 				/*pmu_name=*/NULL,
 				evt_name ?: sdt_name->s,
 				/*event_alias=*/NULL,
 				/*deprecated=*/false,
 				/*scale_unit=*/NULL,
 				"SDT event",
 				/*desc=*/NULL,
 				/*long_desc=*/NULL,
 				/*encoding_desc=*/NULL);

 		free(evt_name);
 	}
 	strlist__delete(sdtlist);
 }

 int print_hwcache_events(const struct print_callbacks *print_cb, void *print_state)
 {
 	struct strlist *evt_name_list = strlist__new(NULL, NULL);
 	struct str_node *nd;

 	if (!evt_name_list) {
 		pr_debug("Failed to allocate new strlist for hwcache events\n");
 		return -ENOMEM;
 	}
 	for (int type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
 		for (int op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
 			/* skip invalid cache type */
 			if (!evsel__is_cache_op_valid(type, op))
 				continue;

 			for (int i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
 				struct perf_pmu *pmu = NULL;
 				char name[64];

 				__evsel__hw_cache_type_op_res_name(type, op, i, name, sizeof(name));
 				if (!perf_pmu__has_hybrid()) {
 					if (is_event_supported(PERF_TYPE_HW_CACHE,
 							       type | (op << 8) | (i << 16)))
 						strlist__add(evt_name_list, name);
 					continue;
 				}
 				perf_pmu__for_each_hybrid_pmu(pmu) {
 					if (is_event_supported(PERF_TYPE_HW_CACHE,
 					    type | (op << 8) | (i << 16) |
 					    ((__u64)pmu->type << PERF_PMU_TYPE_SHIFT))) {
 						char new_name[128];
 							snprintf(new_name, sizeof(new_name),
 								 "%s/%s/", pmu->name, name);
 							strlist__add(evt_name_list, new_name);
 					}
 				}
 			}
 		}
 	}

 	strlist__for_each_entry(nd, evt_name_list) {
 		print_cb->print_event(print_state,
 				"cache",
 				/*pmu_name=*/NULL,
 				nd->s,
 				/*event_alias=*/NULL,
 				/*scale_unit=*/NULL,
 				/*deprecated=*/false,
 				event_type_descriptors[PERF_TYPE_HW_CACHE],
 				/*desc=*/NULL,
 				/*long_desc=*/NULL,
 				/*encoding_desc=*/NULL);
 	}
 	strlist__delete(evt_name_list);
 	return 0;
 }

 void print_tool_events(const struct print_callbacks *print_cb, void *print_state)
 {
 	// Start at 1 because the first enum entry means no tool event.
 	for (int i = 1; i < PERF_TOOL_MAX; ++i) {
 		print_cb->print_event(print_state,
 				"tool",
 				/*pmu_name=*/NULL,
 				event_symbols_tool[i].symbol,
 				event_symbols_tool[i].alias,
 				/*scale_unit=*/NULL,
 				/*deprecated=*/false,
 				"Tool event",
 				/*desc=*/NULL,
 				/*long_desc=*/NULL,
 				/*encoding_desc=*/NULL);
 	}
 }

 void print_symbol_events(const struct print_callbacks *print_cb, void *print_state,
 			 unsigned int type, const struct event_symbol *syms,
 			 unsigned int max)
 {
 	struct strlist *evt_name_list = strlist__new(NULL, NULL);
 	struct str_node *nd;

 	if (!evt_name_list) {
 		pr_debug("Failed to allocate new strlist for symbol events\n");
 		return;
 	}
 	for (unsigned int i = 0; i < max; i++) {
 		/*
 		 * New attr.config still not supported here, the latest
 		 * example was PERF_COUNT_SW_CGROUP_SWITCHES
 		 */
 		if (syms[i].symbol == NULL)
 			continue;

 		if (!is_event_supported(type, i))
 			continue;

 		if (strlen(syms[i].alias)) {
 			char name[MAX_NAME_LEN];

 			snprintf(name, MAX_NAME_LEN, "%s OR %s", syms[i].symbol, syms[i].alias);
 			strlist__add(evt_name_list, name);
 		} else
 			strlist__add(evt_name_list, syms[i].symbol);
 	}

 	strlist__for_each_entry(nd, evt_name_list) {
 		char *alias = strstr(nd->s, " OR ");

 		if (alias) {
 			*alias = '\0';
 			alias += 4;
 		}
 		print_cb->print_event(print_state,
 				/*topic=*/NULL,
 				/*pmu_name=*/NULL,
 				nd->s,
 				alias,
 				/*scale_unit=*/NULL,
 				/*deprecated=*/false,
 				event_type_descriptors[type],
 				/*desc=*/NULL,
 				/*long_desc=*/NULL,
 				/*encoding_desc=*/NULL);
 	}
 	strlist__delete(evt_name_list);
 }

 /*
  * Print the help text for the event symbols:
  */
 void print_events(const struct print_callbacks *print_cb, void *print_state)
 {
 	print_symbol_events(print_cb, print_state, PERF_TYPE_HARDWARE,
 			event_symbols_hw, PERF_COUNT_HW_MAX);
 	print_symbol_events(print_cb, print_state, PERF_TYPE_SOFTWARE,
 			event_symbols_sw, PERF_COUNT_SW_MAX);

 	print_tool_events(print_cb, print_state);

 	print_hwcache_events(print_cb, print_state);

 	print_pmu_events(print_cb, print_state);

 	print_cb->print_event(print_state,
 			/*topic=*/NULL,
 			/*pmu_name=*/NULL,
 			"rNNN",
 			/*event_alias=*/NULL,
 			/*scale_unit=*/NULL,
 			/*deprecated=*/false,
 			event_type_descriptors[PERF_TYPE_RAW],
 			/*desc=*/NULL,
 			/*long_desc=*/NULL,
 			/*encoding_desc=*/NULL);

 	print_cb->print_event(print_state,
 			/*topic=*/NULL,
 			/*pmu_name=*/NULL,
 			"cpu/t1=v1[,t2=v2,t3 ...]/modifier",
 			/*event_alias=*/NULL,
 			/*scale_unit=*/NULL,
 			/*deprecated=*/false,
 			event_type_descriptors[PERF_TYPE_RAW],
 			"(see 'man perf-list' on how to encode it)",
 			/*long_desc=*/NULL,
 			/*encoding_desc=*/NULL);

 	print_cb->print_event(print_state,
 			/*topic=*/NULL,
 			/*pmu_name=*/NULL,
 			"mem:<addr>[/len][:access]",
 			/*scale_unit=*/NULL,
 			/*event_alias=*/NULL,
 			/*deprecated=*/false,
 			event_type_descriptors[PERF_TYPE_BREAKPOINT],
 			/*desc=*/NULL,
 			/*long_desc=*/NULL,
 			/*encoding_desc=*/NULL);

 	print_tracepoint_events(print_cb, print_state);

 	print_sdt_events(print_cb, print_state);

 	metricgroup__print(print_cb, print_state);

 	print_libpfm_events(print_cb, print_state);
 }
	// SPDX-License-Identifier: GPL-2.0
	#include <dirent.h>
	#include <errno.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <fcntl.h>
	#include <sys/param.h>
	#include <unistd.h>

	#include <api/fs/tracing_path.h>
	#include <linux/stddef.h>
	#include <linux/perf_event.h>
	#include <linux/zalloc.h>
	#include <subcmd/pager.h>

	#include "build-id.h"
	#include "debug.h"
	#include "evsel.h"
	#include "metricgroup.h"
	#include "parse-events.h"
	#include "pmu.h"
	#include "print-events.h"
	#include "probe-file.h"
	#include "string2.h"
	#include "strlist.h"
	#include "tracepoint.h"
	#include "pfm.h"
	#include "pmu-hybrid.h"

	#define MAX_NAME_LEN 100

	/** Strings corresponding to enum perf_type_id. */
	static const char * const event_type_descriptors[] = {
	"Hardware event",
	"Software event",
	"Tracepoint event",
	"Hardware cache event",
	"Raw hardware event descriptor",
	"Hardware breakpoint",
	};

	static const struct event_symbol event_symbols_tool[PERF_TOOL_MAX] = {
	[PERF_TOOL_DURATION_TIME] = {
	.symbol = "duration_time",
	.alias = "",
	},
	[PERF_TOOL_USER_TIME] = {
	.symbol = "user_time",
	.alias = "",
	},
	[PERF_TOOL_SYSTEM_TIME] = {
	.symbol = "system_time",
	.alias = "",
	},
	};

	/*
	* Print the events from <debugfs_mount_point>/tracing/events
	*/
	void print_tracepoint_events(const struct print_callbacks print_cb __maybe_unused, void print_state __maybe_unused)
	{
	char *events_path = get_tracing_file("events");
	int events_fd = open(events_path, O_PATH);

	put_tracing_file(events_path);
	if (events_fd < 0) {
	printf("Error: failed to open tracing events directory\n");
	return;
	}

	#ifdef HAVE_SCANDIRAT_SUPPORT
	{
	struct dirent **sys_namelist = NULL;
	int sys_items = tracing_events__scandir_alphasort(&sys_namelist);

	for (int i = 0; i < sys_items; i++) {
	struct dirent *sys_dirent = sys_namelist[i];
	struct dirent **evt_namelist = NULL;
	int dir_fd;
	int evt_items;

	if (sys_dirent->d_type != DT_DIR \|\|
	!strcmp(sys_dirent->d_name, ".") \|\|
	!strcmp(sys_dirent->d_name, ".."))
	goto next_sys;

	dir_fd = openat(events_fd, sys_dirent->d_name, O_PATH);
	if (dir_fd < 0)
	goto next_sys;

	evt_items = scandirat(events_fd, sys_dirent->d_name, &evt_namelist, NULL, alphasort);
	for (int j = 0; j < evt_items; j++) {
	struct dirent *evt_dirent = evt_namelist[j];
	char evt_path[MAXPATHLEN];
	int evt_fd;

	if (evt_dirent->d_type != DT_DIR \|\|
	!strcmp(evt_dirent->d_name, ".") \|\|
	!strcmp(evt_dirent->d_name, ".."))
	goto next_evt;

	snprintf(evt_path, sizeof(evt_path), "%s/id", evt_dirent->d_name);
	evt_fd = openat(dir_fd, evt_path, O_RDONLY);
	if (evt_fd < 0)
	goto next_evt;
	close(evt_fd);

	snprintf(evt_path, MAXPATHLEN, "%s:%s",
	sys_dirent->d_name, evt_dirent->d_name);
	print_cb->print_event(print_state,
	/topic=/NULL,
	/pmu_name=/NULL,
	evt_path,
	/event_alias=/NULL,
	/scale_unit=/NULL,
	/deprecated=/false,
	"Tracepoint event",
	/desc=/NULL,
	/long_desc=/NULL,
	/encoding_desc=/NULL);
	next_evt:
	free(evt_namelist[j]);
	}
	close(dir_fd);
	free(evt_namelist);
	next_sys:
	free(sys_namelist[i]);
	}

	free(sys_namelist);
	}
	#else
	printf("\nWARNING: Your libc doesn't have the scandirat function, please ask its maintainers to implement it.\n"
	" As a rough fallback, please do 'ls %s' to see the available tracepoint events.\n", events_path);
	#endif
	close(events_fd);
	}

	void print_sdt_events(const struct print_callbacks print_cb, void print_state)
	{
	struct strlist bidlist, sdtlist;
	struct str_node bid_nd, sdt_name, *next_sdt_name;
	const char *last_sdt_name = NULL;

	/*
	* The implicitly sorted sdtlist will hold the tracepoint name followed
	* by @<buildid>. If the tracepoint name is unique (determined by
	* looking at the adjacent nodes) the @<buildid> is dropped otherwise
	* the executable path and buildid are added to the name.
	*/
	sdtlist = strlist__new(NULL, NULL);
	if (!sdtlist) {
	pr_debug("Failed to allocate new strlist for SDT\n");
	return;
	}
	bidlist = build_id_cache__list_all(true);
	if (!bidlist) {
	pr_debug("Failed to get buildids: %d\n", errno);
	return;
	}
	strlist__for_each_entry(bid_nd, bidlist) {
	struct probe_cache *pcache;
	struct probe_cache_entry *ent;

	pcache = probe_cache__new(bid_nd->s, NULL);
	if (!pcache)
	continue;
	list_for_each_entry(ent, &pcache->entries, node) {
	char buf[1024];

	snprintf(buf, sizeof(buf), "%s:%s@%s",
	ent->pev.group, ent->pev.event, bid_nd->s);
	strlist__add(sdtlist, buf);
	}
	probe_cache__delete(pcache);
	}
	strlist__delete(bidlist);

	strlist__for_each_entry(sdt_name, sdtlist) {
	bool show_detail = false;
	char *bid = strchr(sdt_name->s, '@');
	char *evt_name = NULL;

	if (bid)
	*(bid++) = '\0';

	if (last_sdt_name && !strcmp(last_sdt_name, sdt_name->s)) {
	show_detail = true;
	} else {
	next_sdt_name = strlist__next(sdt_name);
	if (next_sdt_name) {
	char *bid2 = strchr(next_sdt_name->s, '@');

	if (bid2)
	*bid2 = '\0';
	if (strcmp(sdt_name->s, next_sdt_name->s) == 0)
	show_detail = true;
	if (bid2)
	*bid2 = '@';
	}
	}
	last_sdt_name = sdt_name->s;

	if (show_detail) {
	char *path = build_id_cache__origname(bid);

	if (path) {
	if (asprintf(&evt_name, "%s@%s(%.12s)", sdt_name->s, path, bid) < 0)
	evt_name = NULL;
	free(path);
	}
	}
	print_cb->print_event(print_state,
	/topic=/NULL,
	/pmu_name=/NULL,
	evt_name ?: sdt_name->s,
	/event_alias=/NULL,
	/deprecated=/false,
	/scale_unit=/NULL,
	"SDT event",
	/desc=/NULL,
	/long_desc=/NULL,
	/encoding_desc=/NULL);

	free(evt_name);
	}
	strlist__delete(sdtlist);
	}

	int print_hwcache_events(const struct print_callbacks print_cb, void print_state)
	{
	struct strlist *evt_name_list = strlist__new(NULL, NULL);
	struct str_node *nd;

	if (!evt_name_list) {
	pr_debug("Failed to allocate new strlist for hwcache events\n");
	return -ENOMEM;
	}
	for (int type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
	for (int op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
	/* skip invalid cache type */
	if (!evsel__is_cache_op_valid(type, op))
	continue;

	for (int i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
	struct perf_pmu *pmu = NULL;
	char name[64];

	__evsel__hw_cache_type_op_res_name(type, op, i, name, sizeof(name));
	if (!perf_pmu__has_hybrid()) {
	if (is_event_supported(PERF_TYPE_HW_CACHE,
	type \| (op << 8) \| (i << 16)))
	strlist__add(evt_name_list, name);
	continue;
	}
	perf_pmu__for_each_hybrid_pmu(pmu) {
	if (is_event_supported(PERF_TYPE_HW_CACHE,
	type \| (op << 8) \| (i << 16) \|
	((__u64)pmu->type << PERF_PMU_TYPE_SHIFT))) {
	char new_name[128];
	snprintf(new_name, sizeof(new_name),
	"%s/%s/", pmu->name, name);
	strlist__add(evt_name_list, new_name);
	}
	}
	}
	}
	}

	strlist__for_each_entry(nd, evt_name_list) {
	print_cb->print_event(print_state,
	"cache",
	/pmu_name=/NULL,
	nd->s,
	/event_alias=/NULL,
	/scale_unit=/NULL,
	/deprecated=/false,
	event_type_descriptors[PERF_TYPE_HW_CACHE],
	/desc=/NULL,
	/long_desc=/NULL,
	/encoding_desc=/NULL);
	}
	strlist__delete(evt_name_list);
	return 0;
	}

	void print_tool_events(const struct print_callbacks print_cb, void print_state)
	{
	// Start at 1 because the first enum entry means no tool event.
	for (int i = 1; i < PERF_TOOL_MAX; ++i) {
	print_cb->print_event(print_state,
	"tool",
	/pmu_name=/NULL,
	event_symbols_tool[i].symbol,
	event_symbols_tool[i].alias,
	/scale_unit=/NULL,
	/deprecated=/false,
	"Tool event",
	/desc=/NULL,
	/long_desc=/NULL,
	/encoding_desc=/NULL);
	}
	}

	void print_symbol_events(const struct print_callbacks print_cb, void print_state,
	unsigned int type, const struct event_symbol *syms,
	unsigned int max)
	{
	struct strlist *evt_name_list = strlist__new(NULL, NULL);
	struct str_node *nd;

	if (!evt_name_list) {
	pr_debug("Failed to allocate new strlist for symbol events\n");
	return;
	}
	for (unsigned int i = 0; i < max; i++) {
	/*
	* New attr.config still not supported here, the latest
	* example was PERF_COUNT_SW_CGROUP_SWITCHES
	*/
	if (syms[i].symbol == NULL)
	continue;

	if (!is_event_supported(type, i))
	continue;

	if (strlen(syms[i].alias)) {
	char name[MAX_NAME_LEN];

	snprintf(name, MAX_NAME_LEN, "%s OR %s", syms[i].symbol, syms[i].alias);
	strlist__add(evt_name_list, name);
	} else
	strlist__add(evt_name_list, syms[i].symbol);
	}

	strlist__for_each_entry(nd, evt_name_list) {
	char *alias = strstr(nd->s, " OR ");

	if (alias) {
	*alias = '\0';
	alias += 4;
	}
	print_cb->print_event(print_state,
	/topic=/NULL,
	/pmu_name=/NULL,
	nd->s,
	alias,
	/scale_unit=/NULL,
	/deprecated=/false,
	event_type_descriptors[type],
	/desc=/NULL,
	/long_desc=/NULL,
	/encoding_desc=/NULL);
	}
	strlist__delete(evt_name_list);
	}

	/*
	* Print the help text for the event symbols:
	*/
	void print_events(const struct print_callbacks print_cb, void print_state)
	{
	print_symbol_events(print_cb, print_state, PERF_TYPE_HARDWARE,
	event_symbols_hw, PERF_COUNT_HW_MAX);
	print_symbol_events(print_cb, print_state, PERF_TYPE_SOFTWARE,
	event_symbols_sw, PERF_COUNT_SW_MAX);

	print_tool_events(print_cb, print_state);

	print_hwcache_events(print_cb, print_state);

	print_pmu_events(print_cb, print_state);

	print_cb->print_event(print_state,
	/topic=/NULL,
	/pmu_name=/NULL,
	"rNNN",
	/event_alias=/NULL,
	/scale_unit=/NULL,
	/deprecated=/false,
	event_type_descriptors[PERF_TYPE_RAW],
	/desc=/NULL,
	/long_desc=/NULL,
	/encoding_desc=/NULL);

	print_cb->print_event(print_state,
	/topic=/NULL,
	/pmu_name=/NULL,
	"cpu/t1=v1[,t2=v2,t3 ...]/modifier",
	/event_alias=/NULL,
	/scale_unit=/NULL,
	/deprecated=/false,
	event_type_descriptors[PERF_TYPE_RAW],
	"(see 'man perf-list' on how to encode it)",
	/long_desc=/NULL,
	/encoding_desc=/NULL);

	print_cb->print_event(print_state,
	/topic=/NULL,
	/pmu_name=/NULL,
	"mem:<addr>[/len][:access]",
	/scale_unit=/NULL,
	/event_alias=/NULL,
	/deprecated=/false,
	event_type_descriptors[PERF_TYPE_BREAKPOINT],
	/desc=/NULL,
	/long_desc=/NULL,
	/encoding_desc=/NULL);

	print_tracepoint_events(print_cb, print_state);

	print_sdt_events(print_cb, print_state);

	metricgroup__print(print_cb, print_state);

	print_libpfm_events(print_cb, print_state);
	}