[deliverable/linux.git] / tools / perf / util / event.c

#include <linux/types.h>
#include "event.h"
#include "debug.h"
#include "string.h"
#include "thread.h"

static pid_t event__synthesize_comm(pid_t pid, int full,
				    int (*process)(event_t *event))
{
	event_t ev;
	char filename[PATH_MAX];
	char bf[BUFSIZ];
	FILE *fp;
	size_t size = 0;
	DIR *tasks;
	struct dirent dirent, *next;
	pid_t tgid = 0;

	snprintf(filename, sizeof(filename), "/proc/%d/status", pid);

	fp = fopen(filename, "r");
	if (fp == NULL) {
out_race:
		/*
		 * We raced with a task exiting - just return:
		 */
		pr_debug("couldn't open %s\n", filename);
		return 0;
	}

	memset(&ev.comm, 0, sizeof(ev.comm));
	while (!ev.comm.comm[0] || !ev.comm.pid) {
		if (fgets(bf, sizeof(bf), fp) == NULL)
			goto out_failure;

		if (memcmp(bf, "Name:", 5) == 0) {
			char *name = bf + 5;
			while (*name && isspace(*name))
				++name;
			size = strlen(name) - 1;
			memcpy(ev.comm.comm, name, size++);
		} else if (memcmp(bf, "Tgid:", 5) == 0) {
			char *tgids = bf + 5;
			while (*tgids && isspace(*tgids))
				++tgids;
			tgid = ev.comm.pid = atoi(tgids);
		}
	}

	ev.comm.header.type = PERF_RECORD_COMM;
	size = ALIGN(size, sizeof(u64));
	ev.comm.header.size = sizeof(ev.comm) - (sizeof(ev.comm.comm) - size);

	if (!full) {
		ev.comm.tid = pid;

		process(&ev);
		goto out_fclose;
	}

	snprintf(filename, sizeof(filename), "/proc/%d/task", pid);

	tasks = opendir(filename);
	if (tasks == NULL)
		goto out_race;

	while (!readdir_r(tasks, &dirent, &next) && next) {
		char *end;
		pid = strtol(dirent.d_name, &end, 10);
		if (*end)
			continue;

		ev.comm.tid = pid;

		process(&ev);
	}
	closedir(tasks);

out_fclose:
	fclose(fp);
	return tgid;

out_failure:
	pr_warning("couldn't get COMM and pgid, malformed %s\n", filename);
	return -1;
}

static int event__synthesize_mmap_events(pid_t pid, pid_t tgid,
					 int (*process)(event_t *event))
{
	char filename[PATH_MAX];
	FILE *fp;

	snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);

	fp = fopen(filename, "r");
	if (fp == NULL) {
		/*
		 * We raced with a task exiting - just return:
		 */
		pr_debug("couldn't open %s\n", filename);
		return -1;
	}

	while (1) {
		char bf[BUFSIZ], *pbf = bf;
		event_t ev = {
			.header = { .type = PERF_RECORD_MMAP },
		};
		int n;
		size_t size;
		if (fgets(bf, sizeof(bf), fp) == NULL)
			break;

		/* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
		n = hex2u64(pbf, &ev.mmap.start);
		if (n < 0)
			continue;
		pbf += n + 1;
		n = hex2u64(pbf, &ev.mmap.len);
		if (n < 0)
			continue;
		pbf += n + 3;
		if (*pbf == 'x') { /* vm_exec */
			char *execname = strchr(bf, '/');

			/* Catch VDSO */
			if (execname == NULL)
				execname = strstr(bf, "[vdso]");

			if (execname == NULL)
				continue;

			size = strlen(execname);
			execname[size - 1] = '\0'; /* Remove \n */
			memcpy(ev.mmap.filename, execname, size);
			size = ALIGN(size, sizeof(u64));
			ev.mmap.len -= ev.mmap.start;
			ev.mmap.header.size = (sizeof(ev.mmap) -
					       (sizeof(ev.mmap.filename) - size));
			ev.mmap.pid = tgid;
			ev.mmap.tid = pid;

			process(&ev);
		}
	}

	fclose(fp);
	return 0;
}

int event__synthesize_thread(pid_t pid, int (*process)(event_t *event))
{
	pid_t tgid = event__synthesize_comm(pid, 1, process);
	if (tgid == -1)
		return -1;
	return event__synthesize_mmap_events(pid, tgid, process);
}

void event__synthesize_threads(int (*process)(event_t *event))
{
	DIR *proc;
	struct dirent dirent, *next;

	proc = opendir("/proc");

	while (!readdir_r(proc, &dirent, &next) && next) {
		char *end;
		pid_t pid = strtol(dirent.d_name, &end, 10);

		if (*end) /* only interested in proper numerical dirents */
			continue;

		event__synthesize_thread(pid, process);
	}

	closedir(proc);
}

char *event__cwd;
int  event__cwdlen;

struct events_stats event__stats;

int event__process_comm(event_t *self)
{
	struct thread *thread = threads__findnew(self->comm.pid);

	dump_printf("PERF_RECORD_COMM: %s:%d\n",
		    self->comm.comm, self->comm.pid);

	if (thread == NULL || thread__set_comm(thread, self->comm.comm)) {
		dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
		return -1;
	}

	return 0;
}

int event__process_lost(event_t *self)
{
	dump_printf(": id:%Ld: lost:%Ld\n", self->lost.id, self->lost.lost);
	event__stats.lost += self->lost.lost;
	return 0;
}

int event__process_mmap(event_t *self)
{
	struct thread *thread = threads__findnew(self->mmap.pid);
	struct map *map = map__new(&self->mmap, MAP__FUNCTION,
				   event__cwd, event__cwdlen);

	dump_printf(" %d/%d: [%p(%p) @ %p]: %s\n",
		    self->mmap.pid, self->mmap.tid,
		    (void *)(long)self->mmap.start,
		    (void *)(long)self->mmap.len,
		    (void *)(long)self->mmap.pgoff,
		    self->mmap.filename);

	if (thread == NULL || map == NULL)
		dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
	else
		thread__insert_map(thread, map);

	return 0;
}

int event__process_task(event_t *self)
{
	struct thread *thread = threads__findnew(self->fork.pid);
	struct thread *parent = threads__findnew(self->fork.ppid);

	dump_printf("(%d:%d):(%d:%d)\n", self->fork.pid, self->fork.tid,
		    self->fork.ppid, self->fork.ptid);
	/*
	 * A thread clone will have the same PID for both parent and child.
	 */
	if (thread == parent)
		return 0;

	if (self->header.type == PERF_RECORD_EXIT)
		return 0;

	if (thread == NULL || parent == NULL ||
	    thread__fork(thread, parent) < 0) {
		dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
		return -1;
	}

	return 0;
}

void thread__find_addr_location(struct thread *self, u8 cpumode,
				enum map_type type, u64 addr,
				struct addr_location *al,
				symbol_filter_t filter)
{
	struct thread *thread = al->thread = self;

	al->addr = addr;

	if (cpumode & PERF_RECORD_MISC_KERNEL) {
		al->level = 'k';
		thread = kthread;
	} else if (cpumode & PERF_RECORD_MISC_USER)
		al->level = '.';
	else {
		al->level = 'H';
		al->map = NULL;
		al->sym = NULL;
		return;
	}
try_again:
	al->map = thread__find_map(thread, type, al->addr);
	if (al->map == NULL) {
		/*
		 * If this is outside of all known maps, and is a negative
		 * address, try to look it up in the kernel dso, as it might be
		 * a vsyscall or vdso (which executes in user-mode).
		 *
		 * XXX This is nasty, we should have a symbol list in the
		 * "[vdso]" dso, but for now lets use the old trick of looking
		 * in the whole kernel symbol list.
		 */
		if ((long long)al->addr < 0 && thread != kthread) {
			thread = kthread;
			goto try_again;
		}
		al->sym = NULL;
	} else {
		al->addr = al->map->map_ip(al->map, al->addr);
		al->sym = map__find_symbol(al->map, al->addr, filter);
	}
}

int event__preprocess_sample(const event_t *self, struct addr_location *al,
			     symbol_filter_t filter)
{
	u8 cpumode = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
	struct thread *thread = threads__findnew(self->ip.pid);

	if (thread == NULL)
		return -1;

	dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);

	thread__find_addr_location(thread, cpumode, MAP__FUNCTION,
				   self->ip.ip, al, filter);
	dump_printf(" ...... dso: %s\n",
		    al->map ? al->map->dso->long_name :
			al->level == 'H' ? "[hypervisor]" : "<not found>");
	return 0;
}
Commit	Line	Data
234fbbf5 ACM	1	#include <linux/types.h>
	2	#include "event.h"
	3	#include "debug.h"
	4	#include "string.h"
62daacb5	5	#include "thread.h"
234fbbf5 ACM	6
	7	static pid_t event__synthesize_comm(pid_t pid, int full,
	8	int (process)(event_t event))
	9	{
	10	event_t ev;
	11	char filename[PATH_MAX];
	12	char bf[BUFSIZ];
	13	FILE *fp;
	14	size_t size = 0;
	15	DIR *tasks;
	16	struct dirent dirent, *next;
	17	pid_t tgid = 0;
	18
	19	snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
	20
	21	fp = fopen(filename, "r");
	22	if (fp == NULL) {
	23	out_race:
	24	/*
	25	* We raced with a task exiting - just return:
	26	*/
	27	pr_debug("couldn't open %s\n", filename);
	28	return 0;
	29	}
	30
	31	memset(&ev.comm, 0, sizeof(ev.comm));
	32	while (!ev.comm.comm[0] \|\| !ev.comm.pid) {
	33	if (fgets(bf, sizeof(bf), fp) == NULL)
	34	goto out_failure;
	35
	36	if (memcmp(bf, "Name:", 5) == 0) {
	37	char *name = bf + 5;
	38	while (name && isspace(name))
	39	++name;
	40	size = strlen(name) - 1;
	41	memcpy(ev.comm.comm, name, size++);
	42	} else if (memcmp(bf, "Tgid:", 5) == 0) {
	43	char *tgids = bf + 5;
	44	while (tgids && isspace(tgids))
	45	++tgids;
	46	tgid = ev.comm.pid = atoi(tgids);
	47	}
	48	}
	49
	50	ev.comm.header.type = PERF_RECORD_COMM;
	51	size = ALIGN(size, sizeof(u64));
	52	ev.comm.header.size = sizeof(ev.comm) - (sizeof(ev.comm.comm) - size);
	53
	54	if (!full) {
	55	ev.comm.tid = pid;
	56
	57	process(&ev);
	58	goto out_fclose;
	59	}
	60
	61	snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
	62
	63	tasks = opendir(filename);
	64	if (tasks == NULL)
	65	goto out_race;
	66
	67	while (!readdir_r(tasks, &dirent, &next) && next) {
	68	char *end;
	69	pid = strtol(dirent.d_name, &end, 10);
70	if (*end)
71	continue;
72
73	ev.comm.tid = pid;
74
75	process(&ev);
76	}
77	closedir(tasks);
78
79	out_fclose:
80	fclose(fp);
81	return tgid;
82
83	out_failure:
84	pr_warning("couldn't get COMM and pgid, malformed %s\n", filename);
85	return -1;
86	}
87
88	static int event__synthesize_mmap_events(pid_t pid, pid_t tgid,
89	int (process)(event_t event))
90	{
91	char filename[PATH_MAX];
92	FILE *fp;
93
94	snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
95
96	fp = fopen(filename, "r");
97	if (fp == NULL) {
98	/*
99	* We raced with a task exiting - just return:
100	*/
101	pr_debug("couldn't open %s\n", filename);
102	return -1;
103	}
104
105	while (1) {
106	char bf[BUFSIZ], *pbf = bf;
107	event_t ev = {
108	.header = { .type = PERF_RECORD_MMAP },
109	};
110	int n;
111	size_t size;
112	if (fgets(bf, sizeof(bf), fp) == NULL)
113	break;
114
115	/* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
116	n = hex2u64(pbf, &ev.mmap.start);
117	if (n < 0)
118	continue;
119	pbf += n + 1;
120	n = hex2u64(pbf, &ev.mmap.len);
121	if (n < 0)
122	continue;
123	pbf += n + 3;
124	if (pbf == 'x') { / vm_exec */
125	char *execname = strchr(bf, '/');
126
127	/* Catch VDSO */
128	if (execname == NULL)
129	execname = strstr(bf, "[vdso]");
130
131	if (execname == NULL)
132	continue;
133
134	size = strlen(execname);
135	execname[size - 1] = '\0'; /* Remove \n */
136	memcpy(ev.mmap.filename, execname, size);
137	size = ALIGN(size, sizeof(u64));
138	ev.mmap.len -= ev.mmap.start;
139	ev.mmap.header.size = (sizeof(ev.mmap) -
140	(sizeof(ev.mmap.filename) - size));
141	ev.mmap.pid = tgid;
142	ev.mmap.tid = pid;
143
144	process(&ev);
145	}
146	}
147
148	fclose(fp);
149	return 0;
150	}
151
152	int event__synthesize_thread(pid_t pid, int (process)(event_t event))
153	{
154	pid_t tgid = event__synthesize_comm(pid, 1, process);
155	if (tgid == -1)
156	return -1;
157	return event__synthesize_mmap_events(pid, tgid, process);
158	}
159
160	void event__synthesize_threads(int (process)(event_t event))
161	{
162	DIR *proc;
163	struct dirent dirent, *next;
164
165	proc = opendir("/proc");
166
167	while (!readdir_r(proc, &dirent, &next) && next) {
168	char *end;
169	pid_t pid = strtol(dirent.d_name, &end, 10);
170
171	if (end) / only interested in proper numerical dirents */
172	continue;
173
174	event__synthesize_thread(pid, process);
175	}
176
177	closedir(proc);
178	}
62daacb5 ACM	179
	180	char *event__cwd;
	181	int event__cwdlen;
	182
	183	struct events_stats event__stats;
	184
	185	int event__process_comm(event_t *self)
	186	{
	187	struct thread *thread = threads__findnew(self->comm.pid);
	188
	189	dump_printf("PERF_RECORD_COMM: %s:%d\n",
	190	self->comm.comm, self->comm.pid);
	191
	192	if (thread == NULL \|\| thread__set_comm(thread, self->comm.comm)) {
	193	dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
	194	return -1;
	195	}
	196
	197	return 0;
	198	}
	199
	200	int event__process_lost(event_t *self)
	201	{
	202	dump_printf(": id:%Ld: lost:%Ld\n", self->lost.id, self->lost.lost);
	203	event__stats.lost += self->lost.lost;
	204	return 0;
	205	}
	206
	207	int event__process_mmap(event_t *self)
	208	{
	209	struct thread *thread = threads__findnew(self->mmap.pid);
	210	struct map *map = map__new(&self->mmap, MAP__FUNCTION,
	211	event__cwd, event__cwdlen);
	212
	213	dump_printf(" %d/%d: [%p(%p) @ %p]: %s\n",
	214	self->mmap.pid, self->mmap.tid,
	215	(void *)(long)self->mmap.start,
	216	(void *)(long)self->mmap.len,
	217	(void *)(long)self->mmap.pgoff,
	218	self->mmap.filename);
	219
	220	if (thread == NULL \|\| map == NULL)
	221	dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
	222	else
	223	thread__insert_map(thread, map);
	224
	225	return 0;
	226	}
	227
	228	int event__process_task(event_t *self)
	229	{
	230	struct thread *thread = threads__findnew(self->fork.pid);
	231	struct thread *parent = threads__findnew(self->fork.ppid);
	232
	233	dump_printf("(%d:%d):(%d:%d)\n", self->fork.pid, self->fork.tid,
	234	self->fork.ppid, self->fork.ptid);
	235	/*
	236	* A thread clone will have the same PID for both parent and child.
	237	*/
	238	if (thread == parent)
	239	return 0;
	240
	241	if (self->header.type == PERF_RECORD_EXIT)
	242	return 0;
243
244	if (thread == NULL \|\| parent == NULL \|\|
245	thread__fork(thread, parent) < 0) {
246	dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
247	return -1;
248	}
249
250	return 0;
251	}
1ed091c4 ACM	252
	253	void thread__find_addr_location(struct thread *self, u8 cpumode,
	254	enum map_type type, u64 addr,
	255	struct addr_location *al,
	256	symbol_filter_t filter)
	257	{
	258	struct thread *thread = al->thread = self;
	259
	260	al->addr = addr;
	261
	262	if (cpumode & PERF_RECORD_MISC_KERNEL) {
	263	al->level = 'k';
	264	thread = kthread;
	265	} else if (cpumode & PERF_RECORD_MISC_USER)
	266	al->level = '.';
	267	else {
	268	al->level = 'H';
	269	al->map = NULL;
	270	al->sym = NULL;
	271	return;
	272	}
	273	try_again:
	274	al->map = thread__find_map(thread, type, al->addr);
	275	if (al->map == NULL) {
	276	/*
	277	* If this is outside of all known maps, and is a negative
	278	* address, try to look it up in the kernel dso, as it might be
	279	* a vsyscall or vdso (which executes in user-mode).
	280	*
	281	* XXX This is nasty, we should have a symbol list in the
	282	* "[vdso]" dso, but for now lets use the old trick of looking
	283	* in the whole kernel symbol list.
	284	*/
	285	if ((long long)al->addr < 0 && thread != kthread) {
	286	thread = kthread;
	287	goto try_again;
	288	}
	289	al->sym = NULL;
	290	} else {
	291	al->addr = al->map->map_ip(al->map, al->addr);
	292	al->sym = map__find_symbol(al->map, al->addr, filter);
	293	}
	294	}
	295
	296	int event__preprocess_sample(const event_t self, struct addr_location al,
	297	symbol_filter_t filter)
	298	{
	299	u8 cpumode = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
	300	struct thread *thread = threads__findnew(self->ip.pid);
	301
	302	if (thread == NULL)
	303	return -1;
	304
	305	dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
	306
	307	thread__find_addr_location(thread, cpumode, MAP__FUNCTION,
	308	self->ip.ip, al, filter);
	309	dump_printf(" ...... dso: %s\n",
	310	al->map ? al->map->dso->long_name :
	311	al->level == 'H' ? "[hypervisor]" : "<not found>");
	312	return 0;
	313	}