diff options
Diffstat (limited to 'tools/perf/util/util.c')
| -rw-r--r-- | tools/perf/util/util.c | 205 |
1 files changed, 192 insertions, 13 deletions
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c index 6d17b18e915..95aefa78bb0 100644 --- a/tools/perf/util/util.c +++ b/tools/perf/util/util.c @@ -1,16 +1,23 @@ #include "../perf.h" #include "util.h" +#include <api/fs/fs.h> #include <sys/mman.h> -#ifdef BACKTRACE_SUPPORT +#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> /* * XXX We need to find a better place for these things... */ unsigned int page_size; +int cacheline_size; bool test_attr__enabled; @@ -55,17 +62,20 @@ int mkdir_p(char *path, mode_t mode) return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0; } -static int slow_copyfile(const char *from, const char *to) +static int slow_copyfile(const char *from, const char *to, mode_t mode) { - int err = 0; + 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; @@ -82,7 +92,7 @@ out: return err; } -int copyfile(const char *from, const char *to) +int copyfile_mode(const char *from, const char *to, mode_t mode) { int fromfd, tofd; struct stat st; @@ -93,13 +103,13 @@ int copyfile(const char *from, const char *to) goto out; if (st.st_size == 0) /* /proc? do it slowly... */ - return slow_copyfile(from, to); + return slow_copyfile(from, to, mode); fromfd = open(from, O_RDONLY); if (fromfd < 0) goto out; - tofd = creat(to, 0755); + tofd = creat(to, mode); if (tofd < 0) goto out_close_from; @@ -121,6 +131,11 @@ 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 = ' '; @@ -143,21 +158,42 @@ unsigned long convert_unit(unsigned long value, char *unit) return value; } -int readn(int fd, void *buf, size_t n) +static ssize_t ion(bool is_read, int fd, void *buf, size_t n) { void *buf_start = buf; + size_t left = n; - while (n) { - int ret = read(fd, buf, 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; - n -= ret; - buf += ret; + left -= ret; + buf += ret; } - return buf - buf_start; + 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) @@ -204,7 +240,7 @@ int hex2u64(const char *ptr, u64 *long_val) } /* Obtain a backtrace and print it to stdout. */ -#ifdef BACKTRACE_SUPPORT +#ifdef HAVE_BACKTRACE_SUPPORT void dump_stack(void) { void *array[16]; @@ -361,3 +397,146 @@ int parse_nsec_time(const char *str, u64 *ptime) *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_int(const char *filename, int *value) +{ + char line[64]; + int fd = open(filename, O_RDONLY), err = -1; + + if (fd < 0) + return -1; + + if (read(fd, line, sizeof(line)) > 0) { + *value = atoi(line); + err = 0; + } + + close(fd); + return err; +} + +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; + + 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(errno)); + 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) +{ + char path[PATH_MAX]; + const char *procfs = procfs__mountpoint(); + int value; + + if (!procfs) + return INT_MAX; + + scnprintf(path, PATH_MAX, "%s/sys/kernel/perf_event_paranoid", procfs); + + if (filename__read_int(path, &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; + } +} |