perf_counter tools: Move from Documentation/perf_counter/ to tools/perf/

Several people have suggested that 'perf' has become a full-fledged
tool that should be moved out of Documentation/. Move it to the
(new) tools/ directory.

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 692 insertions, 0 deletions

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
new file mode 100644
index 00000000000..f2e7312f85c
--- /dev/null
+++ b/tools/perf/builtin-top.c
@@ -0,0 +1,692 @@
+/*
+ * builtin-top.c
+ *
+ * Builtin top command: Display a continuously updated profile of
+ * any workload, CPU or specific PID.
+ *
+ * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
+ *
+ * Improvements and fixes by:
+ *
+ *   Arjan van de Ven <arjan@linux.intel.com>
+ *   Yanmin Zhang <yanmin.zhang@intel.com>
+ *   Wu Fengguang <fengguang.wu@intel.com>
+ *   Mike Galbraith <efault@gmx.de>
+ *   Paul Mackerras <paulus@samba.org>
+ *
+ * Released under the GPL v2. (and only v2, not any later version)
+ */
+#include "builtin.h"
+
+#include "perf.h"
+
+#include "util/symbol.h"
+#include "util/color.h"
+#include "util/util.h"
+#include "util/rbtree.h"
+#include "util/parse-options.h"
+#include "util/parse-events.h"
+
+#include <assert.h>
+#include <fcntl.h>
+
+#include <stdio.h>
+
+#include <errno.h>
+#include <time.h>
+#include <sched.h>
+#include <pthread.h>
+
+#include <sys/syscall.h>
+#include <sys/ioctl.h>
+#include <sys/poll.h>
+#include <sys/prctl.h>
+#include <sys/wait.h>
+#include <sys/uio.h>
+#include <sys/mman.h>
+
+#include <linux/unistd.h>
+#include <linux/types.h>
+
+static int			fd[MAX_NR_CPUS][MAX_COUNTERS];
+
+static int			system_wide			=  0;
+
+static int			default_interval		= 100000;
+
+static __u64			count_filter			=  5;
+static int			print_entries			= 15;
+
+static int			target_pid			= -1;
+static int			profile_cpu			= -1;
+static int			nr_cpus				=  0;
+static unsigned int		realtime_prio			=  0;
+static int			group				=  0;
+static unsigned int		page_size;
+static unsigned int		mmap_pages			= 16;
+static int			freq				=  0;
+
+static char			*sym_filter;
+static unsigned long		filter_start;
+static unsigned long		filter_end;
+
+static int			delay_secs			=  2;
+static int			zero;
+static int			dump_symtab;
+
+/*
+ * Symbols
+ */
+
+static uint64_t			min_ip;
+static uint64_t			max_ip = -1ll;
+
+struct sym_entry {
+	struct rb_node		rb_node;
+	struct list_head	node;
+	unsigned long		count[MAX_COUNTERS];
+	unsigned long		snap_count;
+	double			weight;
+	int			skip;
+};
+
+struct sym_entry		*sym_filter_entry;
+
+struct dso			*kernel_dso;
+
+/*
+ * Symbols will be added here in record_ip and will get out
+ * after decayed.
+ */
+static LIST_HEAD(active_symbols);
+static pthread_mutex_t active_symbols_lock = PTHREAD_MUTEX_INITIALIZER;
+
+/*
+ * Ordering weight: count-1 * count-2 * ... / count-n
+ */
+static double sym_weight(const struct sym_entry *sym)
+{
+	double weight = sym->snap_count;
+	int counter;
+
+	for (counter = 1; counter < nr_counters-1; counter++)
+		weight *= sym->count[counter];
+
+	weight /= (sym->count[counter] + 1);
+
+	return weight;
+}
+
+static long			samples;
+static long			userspace_samples;
+static const char		CONSOLE_CLEAR[] = "";
+
+static void __list_insert_active_sym(struct sym_entry *syme)
+{
+	list_add(&syme->node, &active_symbols);
+}
+
+static void list_remove_active_sym(struct sym_entry *syme)
+{
+	pthread_mutex_lock(&active_symbols_lock);
+	list_del_init(&syme->node);
+	pthread_mutex_unlock(&active_symbols_lock);
+}
+
+static void rb_insert_active_sym(struct rb_root *tree, struct sym_entry *se)
+{
+	struct rb_node **p = &tree->rb_node;
+	struct rb_node *parent = NULL;
+	struct sym_entry *iter;
+
+	while (*p != NULL) {
+		parent = *p;
+		iter = rb_entry(parent, struct sym_entry, rb_node);
+
+		if (se->weight > iter->weight)
+			p = &(*p)->rb_left;
+		else
+			p = &(*p)->rb_right;
+	}
+
+	rb_link_node(&se->rb_node, parent, p);
+	rb_insert_color(&se->rb_node, tree);
+}
+
+static void print_sym_table(void)
+{
+	int printed = 0, j;
+	int counter;
+	float samples_per_sec = samples/delay_secs;
+	float ksamples_per_sec = (samples-userspace_samples)/delay_secs;
+	float sum_ksamples = 0.0;
+	struct sym_entry *syme, *n;
+	struct rb_root tmp = RB_ROOT;
+	struct rb_node *nd;
+
+	samples = userspace_samples = 0;
+
+	/* Sort the active symbols */
+	pthread_mutex_lock(&active_symbols_lock);
+	syme = list_entry(active_symbols.next, struct sym_entry, node);
+	pthread_mutex_unlock(&active_symbols_lock);
+
+	list_for_each_entry_safe_from(syme, n, &active_symbols, node) {
+		syme->snap_count = syme->count[0];
+		if (syme->snap_count != 0) {
+			syme->weight = sym_weight(syme);
+			rb_insert_active_sym(&tmp, syme);
+			sum_ksamples += syme->snap_count;
+
+			for (j = 0; j < nr_counters; j++)
+				syme->count[j] = zero ? 0 : syme->count[j] * 7 / 8;
+		} else
+			list_remove_active_sym(syme);
+	}
+
+	puts(CONSOLE_CLEAR);
+
+	printf(
+"------------------------------------------------------------------------------\n");
+	printf( "   PerfTop:%8.0f irqs/sec  kernel:%4.1f%% [",
+		samples_per_sec,
+		100.0 - (100.0*((samples_per_sec-ksamples_per_sec)/samples_per_sec)));
+
+	if (nr_counters == 1) {
+		printf("%Ld", attrs[0].sample_period);
+		if (freq)
+			printf("Hz ");
+		else
+			printf(" ");
+	}
+
+	for (counter = 0; counter < nr_counters; counter++) {
+		if (counter)
+			printf("/");
+
+		printf("%s", event_name(counter));
+	}
+
+	printf( "], ");
+
+	if (target_pid != -1)
+		printf(" (target_pid: %d", target_pid);
+	else
+		printf(" (all");
+
+	if (profile_cpu != -1)
+		printf(", cpu: %d)\n", profile_cpu);
+	else {
+		if (target_pid != -1)
+			printf(")\n");
+		else
+			printf(", %d CPUs)\n", nr_cpus);
+	}
+
+	printf("------------------------------------------------------------------------------\n\n");
+
+	if (nr_counters == 1)
+		printf("             samples    pcnt");
+	else
+		printf("  weight     samples    pcnt");
+
+	printf("         RIP          kernel function\n"
+	       	       "  ______     _______   _____   ________________   _______________\n\n"
+	);
+
+	for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) {
+		struct sym_entry *syme = rb_entry(nd, struct sym_entry, rb_node);
+		struct symbol *sym = (struct symbol *)(syme + 1);
+		char *color = PERF_COLOR_NORMAL;
+		double pcnt;
+
+		if (++printed > print_entries || syme->snap_count < count_filter)
+			continue;
+
+		pcnt = 100.0 - (100.0 * ((sum_ksamples - syme->snap_count) /
+					 sum_ksamples));
+
+		/*
+		 * We color high-overhead entries in red, low-overhead
+		 * entries in green - and keep the middle ground normal:
+		 */
+		if (pcnt >= 5.0)
+			color = PERF_COLOR_RED;
+		if (pcnt < 0.5)
+			color = PERF_COLOR_GREEN;
+
+		if (nr_counters == 1)
+			printf("%20.2f - ", syme->weight);
+		else
+			printf("%9.1f %10ld - ", syme->weight, syme->snap_count);
+
+		color_fprintf(stdout, color, "%4.1f%%", pcnt);
+		printf(" - %016llx : %s\n", sym->start, sym->name);
+	}
+}
+
+static void *display_thread(void *arg)
+{
+	struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
+	int delay_msecs = delay_secs * 1000;
+
+	printf("PerfTop refresh period: %d seconds\n", delay_secs);
+
+	do {
+		print_sym_table();
+	} while (!poll(&stdin_poll, 1, delay_msecs) == 1);
+
+	printf("key pressed - exiting.\n");
+	exit(0);
+
+	return NULL;
+}
+
+static int symbol_filter(struct dso *self, struct symbol *sym)
+{
+	static int filter_match;
+	struct sym_entry *syme;
+	const char *name = sym->name;
+
+	if (!strcmp(name, "_text") ||
+	    !strcmp(name, "_etext") ||
+	    !strcmp(name, "_sinittext") ||
+	    !strncmp("init_module", name, 11) ||
+	    !strncmp("cleanup_module", name, 14) ||
+	    strstr(name, "_text_start") ||
+	    strstr(name, "_text_end"))
+		return 1;
+
+	syme = dso__sym_priv(self, sym);
+	/* Tag samples to be skipped. */
+	if (!strcmp("default_idle", name) ||
+	    !strcmp("cpu_idle", name) ||
+	    !strcmp("enter_idle", name) ||
+	    !strcmp("exit_idle", name) ||
+	    !strcmp("mwait_idle", name))
+		syme->skip = 1;
+
+	if (filter_match == 1) {
+		filter_end = sym->start;
+		filter_match = -1;
+		if (filter_end - filter_start > 10000) {
+			fprintf(stderr,
+				"hm, too large filter symbol <%s> - skipping.\n",
+				sym_filter);
+			fprintf(stderr, "symbol filter start: %016lx\n",
+				filter_start);
+			fprintf(stderr, "                end: %016lx\n",
+				filter_end);
+			filter_end = filter_start = 0;
+			sym_filter = NULL;
+			sleep(1);
+		}
+	}
+
+	if (filter_match == 0 && sym_filter && !strcmp(name, sym_filter)) {
+		filter_match = 1;
+		filter_start = sym->start;
+	}
+
+
+	return 0;
+}
+
+static int parse_symbols(void)
+{
+	struct rb_node *node;
+	struct symbol  *sym;
+
+	kernel_dso = dso__new("[kernel]", sizeof(struct sym_entry));
+	if (kernel_dso == NULL)
+		return -1;
+
+	if (dso__load_kernel(kernel_dso, NULL, symbol_filter, 1) != 0)
+		goto out_delete_dso;
+
+	node = rb_first(&kernel_dso->syms);
+	sym = rb_entry(node, struct symbol, rb_node);
+	min_ip = sym->start;
+
+	node = rb_last(&kernel_dso->syms);
+	sym = rb_entry(node, struct symbol, rb_node);
+	max_ip = sym->end;
+
+	if (dump_symtab)
+		dso__fprintf(kernel_dso, stderr);
+
+	return 0;
+
+out_delete_dso:
+	dso__delete(kernel_dso);
+	kernel_dso = NULL;
+	return -1;
+}
+
+#define TRACE_COUNT     3
+
+/*
+ * Binary search in the histogram table and record the hit:
+ */
+static void record_ip(uint64_t ip, int counter)
+{
+	struct symbol *sym = dso__find_symbol(kernel_dso, ip);
+
+	if (sym != NULL) {
+		struct sym_entry *syme = dso__sym_priv(kernel_dso, sym);
+
+		if (!syme->skip) {
+			syme->count[counter]++;
+			pthread_mutex_lock(&active_symbols_lock);
+			if (list_empty(&syme->node) || !syme->node.next)
+				__list_insert_active_sym(syme);
+			pthread_mutex_unlock(&active_symbols_lock);
+			return;
+		}
+	}
+
+	samples--;
+}
+
+static void process_event(uint64_t ip, int counter)
+{
+	samples++;
+
+	if (ip < min_ip || ip > max_ip) {
+		userspace_samples++;
+		return;
+	}
+
+	record_ip(ip, counter);
+}
+
+struct mmap_data {
+	int			counter;
+	void			*base;
+	unsigned int		mask;
+	unsigned int		prev;
+};
+
+static unsigned int mmap_read_head(struct mmap_data *md)
+{
+	struct perf_counter_mmap_page *pc = md->base;
+	int head;
+
+	head = pc->data_head;
+	rmb();
+
+	return head;
+}
+
+struct timeval last_read, this_read;
+
+static void mmap_read(struct mmap_data *md)
+{
+	unsigned int head = mmap_read_head(md);
+	unsigned int old = md->prev;
+	unsigned char *data = md->base + page_size;
+	int diff;
+
+	gettimeofday(&this_read, NULL);
+
+	/*
+	 * If we're further behind than half the buffer, there's a chance
+	 * the writer will bite our tail and mess up the samples under us.
+	 *
+	 * If we somehow ended up ahead of the head, we got messed up.
+	 *
+	 * In either case, truncate and restart at head.
+	 */
+	diff = head - old;
+	if (diff > md->mask / 2 || diff < 0) {
+		struct timeval iv;
+		unsigned long msecs;
+
+		timersub(&this_read, &last_read, &iv);
+		msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
+
+		fprintf(stderr, "WARNING: failed to keep up with mmap data."
+				"  Last read %lu msecs ago.\n", msecs);
+
+		/*
+		 * head points to a known good entry, start there.
+		 */
+		old = head;
+	}
+
+	last_read = this_read;
+
+	for (; old != head;) {
+		struct ip_event {
+			struct perf_event_header header;
+			__u64 ip;
+			__u32 pid, target_pid;
+		};
+		struct mmap_event {
+			struct perf_event_header header;
+			__u32 pid, target_pid;
+			__u64 start;
+			__u64 len;
+			__u64 pgoff;
+			char filename[PATH_MAX];
+		};
+
+		typedef union event_union {
+			struct perf_event_header header;
+			struct ip_event ip;
+			struct mmap_event mmap;
+		} event_t;
+
+		event_t *event = (event_t *)&data[old & md->mask];
+
+		event_t event_copy;
+
+		size_t size = event->header.size;
+
+		/*
+		 * Event straddles the mmap boundary -- header should always
+		 * be inside due to u64 alignment of output.
+		 */
+		if ((old & md->mask) + size != ((old + size) & md->mask)) {
+			unsigned int offset = old;
+			unsigned int len = min(sizeof(*event), size), cpy;
+			void *dst = &event_copy;
+
+			do {
+				cpy = min(md->mask + 1 - (offset & md->mask), len);
+				memcpy(dst, &data[offset & md->mask], cpy);
+				offset += cpy;
+				dst += cpy;
+				len -= cpy;
+			} while (len);
+
+			event = &event_copy;
+		}
+
+		old += size;
+
+		if (event->header.misc & PERF_EVENT_MISC_OVERFLOW) {
+			if (event->header.type & PERF_SAMPLE_IP)
+				process_event(event->ip.ip, md->counter);
+		}
+	}
+
+	md->prev = old;
+}
+
+static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
+static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
+
+static int __cmd_top(void)
+{
+	struct perf_counter_attr *attr;
+	pthread_t thread;
+	int i, counter, group_fd, nr_poll = 0;
+	unsigned int cpu;
+	int ret;
+
+	for (i = 0; i < nr_cpus; i++) {
+		group_fd = -1;
+		for (counter = 0; counter < nr_counters; counter++) {
+
+			cpu	= profile_cpu;
+			if (target_pid == -1 && profile_cpu == -1)
+				cpu = i;
+
+			attr = attrs + counter;
+
+			attr->sample_type	= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
+			attr->freq		= freq;
+
+			fd[i][counter] = sys_perf_counter_open(attr, target_pid, cpu, group_fd, 0);
+			if (fd[i][counter] < 0) {
+				int err = errno;
+
+				error("syscall returned with %d (%s)\n",
+					fd[i][counter], strerror(err));
+				if (err == EPERM)
+					printf("Are you root?\n");
+				exit(-1);
+			}
+			assert(fd[i][counter] >= 0);
+			fcntl(fd[i][counter], F_SETFL, O_NONBLOCK);
+
+			/*
+			 * First counter acts as the group leader:
+			 */
+			if (group && group_fd == -1)
+				group_fd = fd[i][counter];
+
+			event_array[nr_poll].fd = fd[i][counter];
+			event_array[nr_poll].events = POLLIN;
+			nr_poll++;
+
+			mmap_array[i][counter].counter = counter;
+			mmap_array[i][counter].prev = 0;
+			mmap_array[i][counter].mask = mmap_pages*page_size - 1;
+			mmap_array[i][counter].base = mmap(NULL, (mmap_pages+1)*page_size,
+					PROT_READ, MAP_SHARED, fd[i][counter], 0);
+			if (mmap_array[i][counter].base == MAP_FAILED)
+				die("failed to mmap with %d (%s)\n", errno, strerror(errno));
+		}
+	}
+
+	if (pthread_create(&thread, NULL, display_thread, NULL)) {
+		printf("Could not create display thread.\n");
+		exit(-1);
+	}
+
+	if (realtime_prio) {
+		struct sched_param param;
+
+		param.sched_priority = realtime_prio;
+		if (sched_setscheduler(0, SCHED_FIFO, &param)) {
+			printf("Could not set realtime priority.\n");
+			exit(-1);
+		}
+	}
+
+	while (1) {
+		int hits = samples;
+
+		for (i = 0; i < nr_cpus; i++) {
+			for (counter = 0; counter < nr_counters; counter++)
+				mmap_read(&mmap_array[i][counter]);
+		}
+
+		if (hits == samples)
+			ret = poll(event_array, nr_poll, 100);
+	}
+
+	return 0;
+}
+
+static const char * const top_usage[] = {
+	"perf top [<options>]",
+	NULL
+};
+
+static const struct option options[] = {
+	OPT_CALLBACK('e', "event", NULL, "event",
+		     "event selector. use 'perf list' to list available events",
+		     parse_events),
+	OPT_INTEGER('c', "count", &default_interval,
+		    "event period to sample"),
+	OPT_INTEGER('p', "pid", &target_pid,
+		    "profile events on existing pid"),
+	OPT_BOOLEAN('a', "all-cpus", &system_wide,
+			    "system-wide collection from all CPUs"),
+	OPT_INTEGER('C', "CPU", &profile_cpu,
+		    "CPU to profile on"),
+	OPT_INTEGER('m', "mmap-pages", &mmap_pages,
+		    "number of mmap data pages"),
+	OPT_INTEGER('r', "realtime", &realtime_prio,
+		    "collect data with this RT SCHED_FIFO priority"),
+	OPT_INTEGER('d', "delay", &delay_secs,
+		    "number of seconds to delay between refreshes"),
+	OPT_BOOLEAN('D', "dump-symtab", &dump_symtab,
+			    "dump the symbol table used for profiling"),
+	OPT_INTEGER('f', "count-filter", &count_filter,
+		    "only display functions with more events than this"),
+	OPT_BOOLEAN('g', "group", &group,
+			    "put the counters into a counter group"),
+	OPT_STRING('s', "sym-filter", &sym_filter, "pattern",
+		    "only display symbols matchig this pattern"),
+	OPT_BOOLEAN('z', "zero", &group,
+		    "zero history across updates"),
+	OPT_INTEGER('F', "freq", &freq,
+		    "profile at this frequency"),
+	OPT_INTEGER('E', "entries", &print_entries,
+		    "display this many functions"),
+	OPT_END()
+};
+
+int cmd_top(int argc, const char **argv, const char *prefix)
+{
+	int counter;
+
+	page_size = sysconf(_SC_PAGE_SIZE);
+
+	argc = parse_options(argc, argv, options, top_usage, 0);
+	if (argc)
+		usage_with_options(top_usage, options);
+
+	if (freq) {
+		default_interval = freq;
+		freq = 1;
+	}
+
+	/* CPU and PID are mutually exclusive */
+	if (target_pid != -1 && profile_cpu != -1) {
+		printf("WARNING: PID switch overriding CPU\n");
+		sleep(1);
+		profile_cpu = -1;
+	}
+
+	if (!nr_counters)
+		nr_counters = 1;
+
+	if (delay_secs < 1)
+		delay_secs = 1;
+
+	parse_symbols();
+
+	/*
+	 * Fill in the ones not specifically initialized via -c:
+	 */
+	for (counter = 0; counter < nr_counters; counter++) {
+		if (attrs[counter].sample_period)
+			continue;
+
+		attrs[counter].sample_period = default_interval;
+	}
+
+	nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
+	assert(nr_cpus <= MAX_NR_CPUS);
+	assert(nr_cpus >= 0);
+
+	if (target_pid != -1 || profile_cpu != -1)
+		nr_cpus = 1;
+
+	return __cmd_top();
+}