766 lines
14 KiB
C
766 lines
14 KiB
C
#include "../perf.h"
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#include "util.h"
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#include "debug.h"
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#include <api/fs/fs.h>
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#include <sys/mman.h>
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#include <sys/utsname.h>
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#ifdef HAVE_BACKTRACE_SUPPORT
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#include <execinfo.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <limits.h>
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#include <byteswap.h>
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#include <linux/kernel.h>
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#include <linux/log2.h>
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#include <linux/time64.h>
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#include <unistd.h>
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#include "callchain.h"
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#include "strlist.h"
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#define CALLCHAIN_PARAM_DEFAULT \
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.mode = CHAIN_GRAPH_ABS, \
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.min_percent = 0.5, \
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.order = ORDER_CALLEE, \
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.key = CCKEY_FUNCTION, \
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.value = CCVAL_PERCENT, \
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struct callchain_param callchain_param = {
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CALLCHAIN_PARAM_DEFAULT
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};
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struct callchain_param callchain_param_default = {
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CALLCHAIN_PARAM_DEFAULT
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};
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/*
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* XXX We need to find a better place for these things...
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*/
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unsigned int page_size;
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int cacheline_size;
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int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH;
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int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK;
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bool test_attr__enabled;
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bool perf_host = true;
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bool perf_guest = false;
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void event_attr_init(struct perf_event_attr *attr)
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{
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if (!perf_host)
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attr->exclude_host = 1;
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if (!perf_guest)
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attr->exclude_guest = 1;
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/* to capture ABI version */
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attr->size = sizeof(*attr);
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}
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int mkdir_p(char *path, mode_t mode)
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{
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struct stat st;
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int err;
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char *d = path;
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if (*d != '/')
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return -1;
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if (stat(path, &st) == 0)
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return 0;
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while (*++d == '/');
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while ((d = strchr(d, '/'))) {
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*d = '\0';
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err = stat(path, &st) && mkdir(path, mode);
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*d++ = '/';
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if (err)
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return -1;
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while (*d == '/')
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++d;
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}
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return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
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}
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int rm_rf(char *path)
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{
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DIR *dir;
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int ret = 0;
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struct dirent *d;
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char namebuf[PATH_MAX];
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dir = opendir(path);
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if (dir == NULL)
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return 0;
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while ((d = readdir(dir)) != NULL && !ret) {
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struct stat statbuf;
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if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
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continue;
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scnprintf(namebuf, sizeof(namebuf), "%s/%s",
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path, d->d_name);
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/* We have to check symbolic link itself */
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ret = lstat(namebuf, &statbuf);
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if (ret < 0) {
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pr_debug("stat failed: %s\n", namebuf);
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break;
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}
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if (S_ISDIR(statbuf.st_mode))
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ret = rm_rf(namebuf);
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else
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ret = unlink(namebuf);
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}
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closedir(dir);
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if (ret < 0)
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return ret;
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return rmdir(path);
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}
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/* A filter which removes dot files */
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bool lsdir_no_dot_filter(const char *name __maybe_unused, struct dirent *d)
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{
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return d->d_name[0] != '.';
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}
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/* lsdir reads a directory and store it in strlist */
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struct strlist *lsdir(const char *name,
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bool (*filter)(const char *, struct dirent *))
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{
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struct strlist *list = NULL;
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DIR *dir;
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struct dirent *d;
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dir = opendir(name);
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if (!dir)
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return NULL;
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list = strlist__new(NULL, NULL);
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if (!list) {
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errno = ENOMEM;
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goto out;
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}
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while ((d = readdir(dir)) != NULL) {
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if (!filter || filter(name, d))
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strlist__add(list, d->d_name);
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}
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out:
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closedir(dir);
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return list;
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}
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static int slow_copyfile(const char *from, const char *to)
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{
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int err = -1;
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char *line = NULL;
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size_t n;
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FILE *from_fp = fopen(from, "r"), *to_fp;
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if (from_fp == NULL)
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goto out;
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to_fp = fopen(to, "w");
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if (to_fp == NULL)
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goto out_fclose_from;
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while (getline(&line, &n, from_fp) > 0)
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if (fputs(line, to_fp) == EOF)
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goto out_fclose_to;
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err = 0;
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out_fclose_to:
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fclose(to_fp);
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free(line);
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out_fclose_from:
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fclose(from_fp);
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out:
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return err;
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}
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int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size)
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{
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void *ptr;
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loff_t pgoff;
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pgoff = off_in & ~(page_size - 1);
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off_in -= pgoff;
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ptr = mmap(NULL, off_in + size, PROT_READ, MAP_PRIVATE, ifd, pgoff);
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if (ptr == MAP_FAILED)
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return -1;
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while (size) {
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ssize_t ret = pwrite(ofd, ptr + off_in, size, off_out);
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if (ret < 0 && errno == EINTR)
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continue;
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if (ret <= 0)
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break;
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size -= ret;
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off_in += ret;
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off_out += ret;
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}
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munmap(ptr, off_in + size);
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return size ? -1 : 0;
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}
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int copyfile_mode(const char *from, const char *to, mode_t mode)
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{
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int fromfd, tofd;
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struct stat st;
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int err = -1;
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char *tmp = NULL, *ptr = NULL;
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if (stat(from, &st))
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goto out;
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/* extra 'x' at the end is to reserve space for '.' */
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if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) {
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tmp = NULL;
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goto out;
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}
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ptr = strrchr(tmp, '/');
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if (!ptr)
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goto out;
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ptr = memmove(ptr + 1, ptr, strlen(ptr) - 1);
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*ptr = '.';
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tofd = mkstemp(tmp);
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if (tofd < 0)
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goto out;
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if (fchmod(tofd, mode))
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goto out_close_to;
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if (st.st_size == 0) { /* /proc? do it slowly... */
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err = slow_copyfile(from, tmp);
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goto out_close_to;
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}
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fromfd = open(from, O_RDONLY);
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if (fromfd < 0)
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goto out_close_to;
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err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size);
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close(fromfd);
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out_close_to:
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close(tofd);
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if (!err)
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err = link(tmp, to);
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unlink(tmp);
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out:
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free(tmp);
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return err;
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}
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int copyfile(const char *from, const char *to)
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{
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return copyfile_mode(from, to, 0755);
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}
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unsigned long convert_unit(unsigned long value, char *unit)
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{
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*unit = ' ';
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if (value > 1000) {
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value /= 1000;
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*unit = 'K';
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}
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if (value > 1000) {
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value /= 1000;
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*unit = 'M';
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}
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if (value > 1000) {
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value /= 1000;
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*unit = 'G';
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}
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return value;
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}
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static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
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{
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void *buf_start = buf;
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size_t left = n;
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while (left) {
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ssize_t ret = is_read ? read(fd, buf, left) :
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write(fd, buf, left);
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if (ret < 0 && errno == EINTR)
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continue;
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if (ret <= 0)
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return ret;
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left -= ret;
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buf += ret;
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}
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BUG_ON((size_t)(buf - buf_start) != n);
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return n;
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}
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/*
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* Read exactly 'n' bytes or return an error.
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*/
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ssize_t readn(int fd, void *buf, size_t n)
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{
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return ion(true, fd, buf, n);
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}
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/*
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* Write exactly 'n' bytes or return an error.
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*/
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ssize_t writen(int fd, void *buf, size_t n)
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{
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return ion(false, fd, buf, n);
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}
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size_t hex_width(u64 v)
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{
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size_t n = 1;
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while ((v >>= 4))
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++n;
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return n;
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}
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static int hex(char ch)
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{
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if ((ch >= '0') && (ch <= '9'))
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return ch - '0';
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if ((ch >= 'a') && (ch <= 'f'))
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return ch - 'a' + 10;
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if ((ch >= 'A') && (ch <= 'F'))
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return ch - 'A' + 10;
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return -1;
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}
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/*
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* While we find nice hex chars, build a long_val.
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* Return number of chars processed.
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*/
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int hex2u64(const char *ptr, u64 *long_val)
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{
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const char *p = ptr;
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*long_val = 0;
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while (*p) {
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const int hex_val = hex(*p);
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if (hex_val < 0)
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break;
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*long_val = (*long_val << 4) | hex_val;
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p++;
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}
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return p - ptr;
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}
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/* Obtain a backtrace and print it to stdout. */
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#ifdef HAVE_BACKTRACE_SUPPORT
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void dump_stack(void)
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{
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void *array[16];
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size_t size = backtrace(array, ARRAY_SIZE(array));
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char **strings = backtrace_symbols(array, size);
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size_t i;
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printf("Obtained %zd stack frames.\n", size);
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for (i = 0; i < size; i++)
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printf("%s\n", strings[i]);
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free(strings);
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}
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#else
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void dump_stack(void) {}
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#endif
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void sighandler_dump_stack(int sig)
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{
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psignal(sig, "perf");
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dump_stack();
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signal(sig, SIG_DFL);
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raise(sig);
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}
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int parse_nsec_time(const char *str, u64 *ptime)
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{
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u64 time_sec, time_nsec;
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char *end;
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time_sec = strtoul(str, &end, 10);
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if (*end != '.' && *end != '\0')
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return -1;
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if (*end == '.') {
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int i;
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char nsec_buf[10];
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if (strlen(++end) > 9)
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return -1;
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strncpy(nsec_buf, end, 9);
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nsec_buf[9] = '\0';
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/* make it nsec precision */
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for (i = strlen(nsec_buf); i < 9; i++)
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nsec_buf[i] = '0';
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time_nsec = strtoul(nsec_buf, &end, 10);
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if (*end != '\0')
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return -1;
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} else
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time_nsec = 0;
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*ptime = time_sec * NSEC_PER_SEC + time_nsec;
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return 0;
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}
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unsigned long parse_tag_value(const char *str, struct parse_tag *tags)
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{
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struct parse_tag *i = tags;
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while (i->tag) {
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char *s;
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s = strchr(str, i->tag);
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if (s) {
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unsigned long int value;
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char *endptr;
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value = strtoul(str, &endptr, 10);
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if (s != endptr)
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break;
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if (value > ULONG_MAX / i->mult)
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break;
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value *= i->mult;
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return value;
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}
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i++;
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}
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return (unsigned long) -1;
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}
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int get_stack_size(const char *str, unsigned long *_size)
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{
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char *endptr;
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unsigned long size;
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unsigned long max_size = round_down(USHRT_MAX, sizeof(u64));
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size = strtoul(str, &endptr, 0);
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do {
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if (*endptr)
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break;
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size = round_up(size, sizeof(u64));
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if (!size || size > max_size)
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break;
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*_size = size;
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return 0;
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} while (0);
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pr_err("callchain: Incorrect stack dump size (max %ld): %s\n",
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max_size, str);
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return -1;
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}
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|
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int parse_callchain_record(const char *arg, struct callchain_param *param)
|
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{
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char *tok, *name, *saveptr = NULL;
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char *buf;
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int ret = -1;
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|
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/* We need buffer that we know we can write to. */
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buf = malloc(strlen(arg) + 1);
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if (!buf)
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return -ENOMEM;
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strcpy(buf, arg);
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tok = strtok_r((char *)buf, ",", &saveptr);
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name = tok ? : (char *)buf;
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do {
|
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/* Framepointer style */
|
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if (!strncmp(name, "fp", sizeof("fp"))) {
|
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if (!strtok_r(NULL, ",", &saveptr)) {
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param->record_mode = CALLCHAIN_FP;
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ret = 0;
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} else
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pr_err("callchain: No more arguments "
|
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"needed for --call-graph fp\n");
|
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break;
|
|
|
|
/* Dwarf style */
|
|
} else if (!strncmp(name, "dwarf", sizeof("dwarf"))) {
|
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const unsigned long default_stack_dump_size = 8192;
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|
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ret = 0;
|
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param->record_mode = CALLCHAIN_DWARF;
|
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param->dump_size = default_stack_dump_size;
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|
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tok = strtok_r(NULL, ",", &saveptr);
|
|
if (tok) {
|
|
unsigned long size = 0;
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|
|
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ret = get_stack_size(tok, &size);
|
|
param->dump_size = size;
|
|
}
|
|
} else if (!strncmp(name, "lbr", sizeof("lbr"))) {
|
|
if (!strtok_r(NULL, ",", &saveptr)) {
|
|
param->record_mode = CALLCHAIN_LBR;
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|
ret = 0;
|
|
} else
|
|
pr_err("callchain: No more arguments "
|
|
"needed for --call-graph lbr\n");
|
|
break;
|
|
} else {
|
|
pr_err("callchain: Unknown --call-graph option "
|
|
"value: %s\n", arg);
|
|
break;
|
|
}
|
|
|
|
} while (0);
|
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|
|
free(buf);
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|
return ret;
|
|
}
|
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|
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const char *get_filename_for_perf_kvm(void)
|
|
{
|
|
const char *filename;
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|
|
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if (perf_host && !perf_guest)
|
|
filename = strdup("perf.data.host");
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|
else if (!perf_host && perf_guest)
|
|
filename = strdup("perf.data.guest");
|
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else
|
|
filename = strdup("perf.data.kvm");
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|
|
return filename;
|
|
}
|
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|
|
int perf_event_paranoid(void)
|
|
{
|
|
int value;
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|
|
|
if (sysctl__read_int("kernel/perf_event_paranoid", &value))
|
|
return INT_MAX;
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|
|
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 false;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
int
|
|
fetch_kernel_version(unsigned int *puint, char *str,
|
|
size_t str_size)
|
|
{
|
|
struct utsname utsname;
|
|
int version, patchlevel, sublevel, err;
|
|
|
|
if (uname(&utsname))
|
|
return -1;
|
|
|
|
if (str && str_size) {
|
|
strncpy(str, utsname.release, str_size);
|
|
str[str_size - 1] = '\0';
|
|
}
|
|
|
|
err = sscanf(utsname.release, "%d.%d.%d",
|
|
&version, &patchlevel, &sublevel);
|
|
|
|
if (err != 3) {
|
|
pr_debug("Unablt to get kernel version from uname '%s'\n",
|
|
utsname.release);
|
|
return -1;
|
|
}
|
|
|
|
if (puint)
|
|
*puint = (version << 16) + (patchlevel << 8) + sublevel;
|
|
return 0;
|
|
}
|
|
|
|
const char *perf_tip(const char *dirpath)
|
|
{
|
|
struct strlist *tips;
|
|
struct str_node *node;
|
|
char *tip = NULL;
|
|
struct strlist_config conf = {
|
|
.dirname = dirpath,
|
|
.file_only = true,
|
|
};
|
|
|
|
tips = strlist__new("tips.txt", &conf);
|
|
if (tips == NULL)
|
|
return errno == ENOENT ? NULL : "Tip: get more memory! ;-p";
|
|
|
|
if (strlist__nr_entries(tips) == 0)
|
|
goto out;
|
|
|
|
node = strlist__entry(tips, random() % strlist__nr_entries(tips));
|
|
if (asprintf(&tip, "Tip: %s", node->s) < 0)
|
|
tip = (char *)"Tip: get more memory! ;-)";
|
|
|
|
out:
|
|
strlist__delete(tips);
|
|
|
|
return tip;
|
|
}
|
|
|
|
bool is_regular_file(const char *file)
|
|
{
|
|
struct stat st;
|
|
|
|
if (stat(file, &st))
|
|
return false;
|
|
|
|
return S_ISREG(st.st_mode);
|
|
}
|
|
|
|
int fetch_current_timestamp(char *buf, size_t sz)
|
|
{
|
|
struct timeval tv;
|
|
struct tm tm;
|
|
char dt[32];
|
|
|
|
if (gettimeofday(&tv, NULL) || !localtime_r(&tv.tv_sec, &tm))
|
|
return -1;
|
|
|
|
if (!strftime(dt, sizeof(dt), "%Y%m%d%H%M%S", &tm))
|
|
return -1;
|
|
|
|
scnprintf(buf, sz, "%s%02u", dt, (unsigned)tv.tv_usec / 10000);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void print_binary(unsigned char *data, size_t len,
|
|
size_t bytes_per_line, print_binary_t printer,
|
|
void *extra)
|
|
{
|
|
size_t i, j, mask;
|
|
|
|
if (!printer)
|
|
return;
|
|
|
|
bytes_per_line = roundup_pow_of_two(bytes_per_line);
|
|
mask = bytes_per_line - 1;
|
|
|
|
printer(BINARY_PRINT_DATA_BEGIN, 0, extra);
|
|
for (i = 0; i < len; i++) {
|
|
if ((i & mask) == 0) {
|
|
printer(BINARY_PRINT_LINE_BEGIN, -1, extra);
|
|
printer(BINARY_PRINT_ADDR, i, extra);
|
|
}
|
|
|
|
printer(BINARY_PRINT_NUM_DATA, data[i], extra);
|
|
|
|
if (((i & mask) == mask) || i == len - 1) {
|
|
for (j = 0; j < mask-(i & mask); j++)
|
|
printer(BINARY_PRINT_NUM_PAD, -1, extra);
|
|
|
|
printer(BINARY_PRINT_SEP, i, extra);
|
|
for (j = i & ~mask; j <= i; j++)
|
|
printer(BINARY_PRINT_CHAR_DATA, data[j], extra);
|
|
for (j = 0; j < mask-(i & mask); j++)
|
|
printer(BINARY_PRINT_CHAR_PAD, i, extra);
|
|
printer(BINARY_PRINT_LINE_END, -1, extra);
|
|
}
|
|
}
|
|
printer(BINARY_PRINT_DATA_END, -1, extra);
|
|
}
|
|
|
|
int is_printable_array(char *p, unsigned int len)
|
|
{
|
|
unsigned int i;
|
|
|
|
if (!p || !len || p[len - 1] != 0)
|
|
return 0;
|
|
|
|
len--;
|
|
|
|
for (i = 0; i < len; i++) {
|
|
if (!isprint(p[i]) && !isspace(p[i]))
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|