--- /dev/null
+#include "../perf.h"
+#include "util.h"
+#include "debug.h"
+#include <api/fs/fs.h>
+#include <sys/mman.h>
+#ifdef HAVE_BACKTRACE_SUPPORT
+#include <execinfo.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <limits.h>
+#include <byteswap.h>
+#include <linux/kernel.h>
+#include <unistd.h>
+#include "callchain.h"
+
+struct callchain_param callchain_param = {
+ .mode = CHAIN_GRAPH_REL,
+ .min_percent = 0.5,
+ .order = ORDER_CALLEE,
+ .key = CCKEY_FUNCTION
+};
+
+/*
+ * XXX We need to find a better place for these things...
+ */
+unsigned int page_size;
+int cacheline_size;
+
+bool test_attr__enabled;
+
+bool perf_host = true;
+bool perf_guest = false;
+
+char tracing_events_path[PATH_MAX + 1] = "/sys/kernel/debug/tracing/events";
+
+void event_attr_init(struct perf_event_attr *attr)
+{
+ if (!perf_host)
+ attr->exclude_host = 1;
+ if (!perf_guest)
+ attr->exclude_guest = 1;
+ /* to capture ABI version */
+ attr->size = sizeof(*attr);
+}
+
+int mkdir_p(char *path, mode_t mode)
+{
+ struct stat st;
+ int err;
+ char *d = path;
+
+ if (*d != '/')
+ return -1;
+
+ if (stat(path, &st) == 0)
+ return 0;
+
+ while (*++d == '/');
+
+ while ((d = strchr(d, '/'))) {
+ *d = '\0';
+ err = stat(path, &st) && mkdir(path, mode);
+ *d++ = '/';
+ if (err)
+ return -1;
+ while (*d == '/')
+ ++d;
+ }
+ return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
+}
+
+static int slow_copyfile(const char *from, const char *to, mode_t mode)
+{
+ int err = -1;
+ char *line = NULL;
+ size_t n;
+ FILE *from_fp = fopen(from, "r"), *to_fp;
+ mode_t old_umask;
+
+ if (from_fp == NULL)
+ goto out;
+
+ old_umask = umask(mode ^ 0777);
+ to_fp = fopen(to, "w");
+ umask(old_umask);
+ if (to_fp == NULL)
+ goto out_fclose_from;
+
+ while (getline(&line, &n, from_fp) > 0)
+ if (fputs(line, to_fp) == EOF)
+ goto out_fclose_to;
+ err = 0;
+out_fclose_to:
+ fclose(to_fp);
+ free(line);
+out_fclose_from:
+ fclose(from_fp);
+out:
+ return err;
+}
+
+int copyfile_mode(const char *from, const char *to, mode_t mode)
+{
+ int fromfd, tofd;
+ struct stat st;
+ void *addr;
+ int err = -1;
+
+ if (stat(from, &st))
+ goto out;
+
+ if (st.st_size == 0) /* /proc? do it slowly... */
+ return slow_copyfile(from, to, mode);
+
+ fromfd = open(from, O_RDONLY);
+ if (fromfd < 0)
+ goto out;
+
+ tofd = creat(to, mode);
+ if (tofd < 0)
+ goto out_close_from;
+
+ addr = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fromfd, 0);
+ if (addr == MAP_FAILED)
+ goto out_close_to;
+
+ if (write(tofd, addr, st.st_size) == st.st_size)
+ err = 0;
+
+ munmap(addr, st.st_size);
+out_close_to:
+ close(tofd);
+ if (err)
+ unlink(to);
+out_close_from:
+ close(fromfd);
+out:
+ return err;
+}
+
+int copyfile(const char *from, const char *to)
+{
+ return copyfile_mode(from, to, 0755);
+}
+
+unsigned long convert_unit(unsigned long value, char *unit)
+{
+ *unit = ' ';
+
+ if (value > 1000) {
+ value /= 1000;
+ *unit = 'K';
+ }
+
+ if (value > 1000) {
+ value /= 1000;
+ *unit = 'M';
+ }
+
+ if (value > 1000) {
+ value /= 1000;
+ *unit = 'G';
+ }
+
+ return value;
+}
+
+static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
+{
+ void *buf_start = buf;
+ size_t left = n;
+
+ while (left) {
+ ssize_t ret = is_read ? read(fd, buf, left) :
+ write(fd, buf, left);
+
+ if (ret < 0 && errno == EINTR)
+ continue;
+ if (ret <= 0)
+ return ret;
+
+ left -= ret;
+ buf += ret;
+ }
+
+ BUG_ON((size_t)(buf - buf_start) != n);
+ return n;
+}
+
+/*
+ * Read exactly 'n' bytes or return an error.
+ */
+ssize_t readn(int fd, void *buf, size_t n)
+{
+ return ion(true, fd, buf, n);
+}
+
+/*
+ * Write exactly 'n' bytes or return an error.
+ */
+ssize_t writen(int fd, void *buf, size_t n)
+{
+ return ion(false, fd, buf, n);
+}
+
+size_t hex_width(u64 v)
+{
+ size_t n = 1;
+
+ while ((v >>= 4))
+ ++n;
+
+ return n;
+}
+
+static int hex(char ch)
+{
+ if ((ch >= '0') && (ch <= '9'))
+ return ch - '0';
+ if ((ch >= 'a') && (ch <= 'f'))
+ return ch - 'a' + 10;
+ if ((ch >= 'A') && (ch <= 'F'))
+ return ch - 'A' + 10;
+ return -1;
+}
+
+/*
+ * While we find nice hex chars, build a long_val.
+ * Return number of chars processed.
+ */
+int hex2u64(const char *ptr, u64 *long_val)
+{
+ const char *p = ptr;
+ *long_val = 0;
+
+ while (*p) {
+ const int hex_val = hex(*p);
+
+ if (hex_val < 0)
+ break;
+
+ *long_val = (*long_val << 4) | hex_val;
+ p++;
+ }
+
+ return p - ptr;
+}
+
+/* Obtain a backtrace and print it to stdout. */
+#ifdef HAVE_BACKTRACE_SUPPORT
+void dump_stack(void)
+{
+ void *array[16];
+ size_t size = backtrace(array, ARRAY_SIZE(array));
+ char **strings = backtrace_symbols(array, size);
+ size_t i;
+
+ printf("Obtained %zd stack frames.\n", size);
+
+ for (i = 0; i < size; i++)
+ printf("%s\n", strings[i]);
+
+ free(strings);
+}
+#else
+void dump_stack(void) {}
+#endif
+
+void sighandler_dump_stack(int sig)
+{
+ psignal(sig, "perf");
+ dump_stack();
+ exit(sig);
+}
+
+void get_term_dimensions(struct winsize *ws)
+{
+ char *s = getenv("LINES");
+
+ if (s != NULL) {
+ ws->ws_row = atoi(s);
+ s = getenv("COLUMNS");
+ if (s != NULL) {
+ ws->ws_col = atoi(s);
+ if (ws->ws_row && ws->ws_col)
+ return;
+ }
+ }
+#ifdef TIOCGWINSZ
+ if (ioctl(1, TIOCGWINSZ, ws) == 0 &&
+ ws->ws_row && ws->ws_col)
+ return;
+#endif
+ ws->ws_row = 25;
+ ws->ws_col = 80;
+}
+
+void set_term_quiet_input(struct termios *old)
+{
+ struct termios tc;
+
+ tcgetattr(0, old);
+ tc = *old;
+ tc.c_lflag &= ~(ICANON | ECHO);
+ tc.c_cc[VMIN] = 0;
+ tc.c_cc[VTIME] = 0;
+ tcsetattr(0, TCSANOW, &tc);
+}
+
+static void set_tracing_events_path(const char *tracing, const char *mountpoint)
+{
+ snprintf(tracing_events_path, sizeof(tracing_events_path), "%s/%s%s",
+ mountpoint, tracing, "events");
+}
+
+static const char *__perf_tracefs_mount(const char *mountpoint)
+{
+ const char *mnt;
+
+ mnt = tracefs_mount(mountpoint);
+ if (!mnt)
+ return NULL;
+
+ set_tracing_events_path("", mnt);
+
+ return mnt;
+}
+
+static const char *__perf_debugfs_mount(const char *mountpoint)
+{
+ const char *mnt;
+
+ mnt = debugfs_mount(mountpoint);
+ if (!mnt)
+ return NULL;
+
+ set_tracing_events_path("tracing/", mnt);
+
+ return mnt;
+}
+
+const char *perf_debugfs_mount(const char *mountpoint)
+{
+ const char *mnt;
+
+ mnt = __perf_tracefs_mount(mountpoint);
+ if (mnt)
+ return mnt;
+
+ mnt = __perf_debugfs_mount(mountpoint);
+
+ return mnt;
+}
+
+void perf_debugfs_set_path(const char *mntpt)
+{
+ snprintf(debugfs_mountpoint, strlen(debugfs_mountpoint), "%s", mntpt);
+ set_tracing_events_path("tracing/", mntpt);
+}
+
+static const char *find_tracefs(void)
+{
+ const char *path = __perf_tracefs_mount(NULL);
+
+ return path;
+}
+
+static const char *find_debugfs(void)
+{
+ const char *path = __perf_debugfs_mount(NULL);
+
+ if (!path)
+ fprintf(stderr, "Your kernel does not support the debugfs filesystem");
+
+ return path;
+}
+
+/*
+ * Finds the path to the debugfs/tracing
+ * Allocates the string and stores it.
+ */
+const char *find_tracing_dir(void)
+{
+ const char *tracing_dir = "";
+ static char *tracing;
+ static int tracing_found;
+ const char *debugfs;
+
+ if (tracing_found)
+ return tracing;
+
+ debugfs = find_tracefs();
+ if (!debugfs) {
+ tracing_dir = "/tracing";
+ debugfs = find_debugfs();
+ if (!debugfs)
+ return NULL;
+ }
+
+ if (asprintf(&tracing, "%s%s", debugfs, tracing_dir) < 0)
+ return NULL;
+
+ tracing_found = 1;
+ return tracing;
+}
+
+char *get_tracing_file(const char *name)
+{
+ const char *tracing;
+ char *file;
+
+ tracing = find_tracing_dir();
+ if (!tracing)
+ return NULL;
+
+ if (asprintf(&file, "%s/%s", tracing, name) < 0)
+ return NULL;
+
+ return file;
+}
+
+void put_tracing_file(char *file)
+{
+ free(file);
+}
+
+int parse_nsec_time(const char *str, u64 *ptime)
+{
+ u64 time_sec, time_nsec;
+ char *end;
+
+ time_sec = strtoul(str, &end, 10);
+ if (*end != '.' && *end != '\0')
+ return -1;
+
+ if (*end == '.') {
+ int i;
+ char nsec_buf[10];
+
+ if (strlen(++end) > 9)
+ return -1;
+
+ strncpy(nsec_buf, end, 9);
+ nsec_buf[9] = '\0';
+
+ /* make it nsec precision */
+ for (i = strlen(nsec_buf); i < 9; i++)
+ nsec_buf[i] = '0';
+
+ time_nsec = strtoul(nsec_buf, &end, 10);
+ if (*end != '\0')
+ return -1;
+ } else
+ time_nsec = 0;
+
+ *ptime = time_sec * NSEC_PER_SEC + time_nsec;
+ return 0;
+}
+
+unsigned long parse_tag_value(const char *str, struct parse_tag *tags)
+{
+ struct parse_tag *i = tags;
+
+ while (i->tag) {
+ char *s;
+
+ s = strchr(str, i->tag);
+ if (s) {
+ unsigned long int value;
+ char *endptr;
+
+ value = strtoul(str, &endptr, 10);
+ if (s != endptr)
+ break;
+
+ if (value > ULONG_MAX / i->mult)
+ break;
+ value *= i->mult;
+ return value;
+ }
+ i++;
+ }
+
+ return (unsigned long) -1;
+}
+
+int filename__read_str(const char *filename, char **buf, size_t *sizep)
+{
+ size_t size = 0, alloc_size = 0;
+ void *bf = NULL, *nbf;
+ int fd, n, err = 0;
+ char sbuf[STRERR_BUFSIZE];
+
+ fd = open(filename, O_RDONLY);
+ if (fd < 0)
+ return -errno;
+
+ do {
+ if (size == alloc_size) {
+ alloc_size += BUFSIZ;
+ nbf = realloc(bf, alloc_size);
+ if (!nbf) {
+ err = -ENOMEM;
+ break;
+ }
+
+ bf = nbf;
+ }
+
+ n = read(fd, bf + size, alloc_size - size);
+ if (n < 0) {
+ if (size) {
+ pr_warning("read failed %d: %s\n", errno,
+ strerror_r(errno, sbuf, sizeof(sbuf)));
+ err = 0;
+ } else
+ err = -errno;
+
+ break;
+ }
+
+ size += n;
+ } while (n > 0);
+
+ if (!err) {
+ *sizep = size;
+ *buf = bf;
+ } else
+ free(bf);
+
+ close(fd);
+ return err;
+}
+
+const char *get_filename_for_perf_kvm(void)
+{
+ const char *filename;
+
+ if (perf_host && !perf_guest)
+ filename = strdup("perf.data.host");
+ else if (!perf_host && perf_guest)
+ filename = strdup("perf.data.guest");
+ else
+ filename = strdup("perf.data.kvm");
+
+ return filename;
+}
+
+int perf_event_paranoid(void)
+{
+ int value;
+
+ if (sysctl__read_int("kernel/perf_event_paranoid", &value))
+ return INT_MAX;
+
+ return value;
+}
+
+void mem_bswap_32(void *src, int byte_size)
+{
+ u32 *m = src;
+ while (byte_size > 0) {
+ *m = bswap_32(*m);
+ byte_size -= sizeof(u32);
+ ++m;
+ }
+}
+
+void mem_bswap_64(void *src, int byte_size)
+{
+ u64 *m = src;
+
+ while (byte_size > 0) {
+ *m = bswap_64(*m);
+ byte_size -= sizeof(u64);
+ ++m;
+ }
+}
+
+bool find_process(const char *name)
+{
+ size_t len = strlen(name);
+ DIR *dir;
+ struct dirent *d;
+ int ret = -1;
+
+ dir = opendir(procfs__mountpoint());
+ if (!dir)
+ return -1;
+
+ /* Walk through the directory. */
+ while (ret && (d = readdir(dir)) != NULL) {
+ char path[PATH_MAX];
+ char *data;
+ size_t size;
+
+ if ((d->d_type != DT_DIR) ||
+ !strcmp(".", d->d_name) ||
+ !strcmp("..", d->d_name))
+ continue;
+
+ scnprintf(path, sizeof(path), "%s/%s/comm",
+ procfs__mountpoint(), d->d_name);
+
+ if (filename__read_str(path, &data, &size))
+ continue;
+
+ ret = strncmp(name, data, len);
+ free(data);
+ }
+
+ closedir(dir);
+ return ret ? false : true;
+}
Code Review / kvmfornfv.git / blobdiff