![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
Just removing more stuff from tools/perf/, this is mostly used in the kallsyms parsing and in places in perf where kallsyms is involved, so we get it for free there. With this we reduce a bit more util.h. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lkml.kernel.org/n/tip-5mc1zg0jqdwgkn8c358kaba6@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
568 lines
11 KiB
C
568 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include "../perf.h"
|
|
#include "util.h"
|
|
#include "debug.h"
|
|
#include "namespaces.h"
|
|
#include <api/fs/fs.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/utsname.h>
|
|
#include <dirent.h>
|
|
#include <fcntl.h>
|
|
#include <inttypes.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <limits.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/log2.h>
|
|
#include <linux/time64.h>
|
|
#include <unistd.h>
|
|
#include "strlist.h"
|
|
#include "string2.h"
|
|
|
|
/*
|
|
* XXX We need to find a better place for these things...
|
|
*/
|
|
|
|
bool perf_singlethreaded = true;
|
|
|
|
void perf_set_singlethreaded(void)
|
|
{
|
|
perf_singlethreaded = true;
|
|
}
|
|
|
|
void perf_set_multithreaded(void)
|
|
{
|
|
perf_singlethreaded = false;
|
|
}
|
|
|
|
unsigned int page_size;
|
|
|
|
#ifdef _SC_LEVEL1_DCACHE_LINESIZE
|
|
#define cache_line_size(cacheline_sizep) *cacheline_sizep = sysconf(_SC_LEVEL1_DCACHE_LINESIZE)
|
|
#else
|
|
static void cache_line_size(int *cacheline_sizep)
|
|
{
|
|
if (sysfs__read_int("devices/system/cpu/cpu0/cache/index0/coherency_line_size", cacheline_sizep))
|
|
pr_debug("cannot determine cache line size");
|
|
}
|
|
#endif
|
|
|
|
int cacheline_size(void)
|
|
{
|
|
static int size;
|
|
|
|
if (!size)
|
|
cache_line_size(&size);
|
|
|
|
return size;
|
|
}
|
|
|
|
int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH;
|
|
int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK;
|
|
|
|
int sysctl__max_stack(void)
|
|
{
|
|
int value;
|
|
|
|
if (sysctl__read_int("kernel/perf_event_max_stack", &value) == 0)
|
|
sysctl_perf_event_max_stack = value;
|
|
|
|
if (sysctl__read_int("kernel/perf_event_max_contexts_per_stack", &value) == 0)
|
|
sysctl_perf_event_max_contexts_per_stack = value;
|
|
|
|
return sysctl_perf_event_max_stack;
|
|
}
|
|
|
|
bool test_attr__enabled;
|
|
|
|
bool perf_host = true;
|
|
bool perf_guest = false;
|
|
|
|
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 bool match_pat(char *file, const char **pat)
|
|
{
|
|
int i = 0;
|
|
|
|
if (!pat)
|
|
return true;
|
|
|
|
while (pat[i]) {
|
|
if (strglobmatch(file, pat[i]))
|
|
return true;
|
|
|
|
i++;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* The depth specify how deep the removal will go.
|
|
* 0 - will remove only files under the 'path' directory
|
|
* 1 .. x - will dive in x-level deep under the 'path' directory
|
|
*
|
|
* If specified the pat is array of string patterns ended with NULL,
|
|
* which are checked upon every file/directory found. Only matching
|
|
* ones are removed.
|
|
*
|
|
* The function returns:
|
|
* 0 on success
|
|
* -1 on removal failure with errno set
|
|
* -2 on pattern failure
|
|
*/
|
|
static int rm_rf_depth_pat(const char *path, int depth, const char **pat)
|
|
{
|
|
DIR *dir;
|
|
int ret;
|
|
struct dirent *d;
|
|
char namebuf[PATH_MAX];
|
|
struct stat statbuf;
|
|
|
|
/* Do not fail if there's no file. */
|
|
ret = lstat(path, &statbuf);
|
|
if (ret)
|
|
return 0;
|
|
|
|
/* Try to remove any file we get. */
|
|
if (!(statbuf.st_mode & S_IFDIR))
|
|
return unlink(path);
|
|
|
|
/* We have directory in path. */
|
|
dir = opendir(path);
|
|
if (dir == NULL)
|
|
return -1;
|
|
|
|
while ((d = readdir(dir)) != NULL && !ret) {
|
|
|
|
if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
|
|
continue;
|
|
|
|
if (!match_pat(d->d_name, pat))
|
|
return -2;
|
|
|
|
scnprintf(namebuf, sizeof(namebuf), "%s/%s",
|
|
path, d->d_name);
|
|
|
|
/* We have to check symbolic link itself */
|
|
ret = lstat(namebuf, &statbuf);
|
|
if (ret < 0) {
|
|
pr_debug("stat failed: %s\n", namebuf);
|
|
break;
|
|
}
|
|
|
|
if (S_ISDIR(statbuf.st_mode))
|
|
ret = depth ? rm_rf_depth_pat(namebuf, depth - 1, pat) : 0;
|
|
else
|
|
ret = unlink(namebuf);
|
|
}
|
|
closedir(dir);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return rmdir(path);
|
|
}
|
|
|
|
int rm_rf_perf_data(const char *path)
|
|
{
|
|
const char *pat[] = {
|
|
"header",
|
|
"data.*",
|
|
NULL,
|
|
};
|
|
|
|
return rm_rf_depth_pat(path, 0, pat);
|
|
}
|
|
|
|
int rm_rf(const char *path)
|
|
{
|
|
return rm_rf_depth_pat(path, INT_MAX, NULL);
|
|
}
|
|
|
|
/* A filter which removes dot files */
|
|
bool lsdir_no_dot_filter(const char *name __maybe_unused, struct dirent *d)
|
|
{
|
|
return d->d_name[0] != '.';
|
|
}
|
|
|
|
/* lsdir reads a directory and store it in strlist */
|
|
struct strlist *lsdir(const char *name,
|
|
bool (*filter)(const char *, struct dirent *))
|
|
{
|
|
struct strlist *list = NULL;
|
|
DIR *dir;
|
|
struct dirent *d;
|
|
|
|
dir = opendir(name);
|
|
if (!dir)
|
|
return NULL;
|
|
|
|
list = strlist__new(NULL, NULL);
|
|
if (!list) {
|
|
errno = ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
while ((d = readdir(dir)) != NULL) {
|
|
if (!filter || filter(name, d))
|
|
strlist__add(list, d->d_name);
|
|
}
|
|
|
|
out:
|
|
closedir(dir);
|
|
return list;
|
|
}
|
|
|
|
static int slow_copyfile(const char *from, const char *to, struct nsinfo *nsi)
|
|
{
|
|
int err = -1;
|
|
char *line = NULL;
|
|
size_t n;
|
|
FILE *from_fp, *to_fp;
|
|
struct nscookie nsc;
|
|
|
|
nsinfo__mountns_enter(nsi, &nsc);
|
|
from_fp = fopen(from, "r");
|
|
nsinfo__mountns_exit(&nsc);
|
|
if (from_fp == NULL)
|
|
goto out;
|
|
|
|
to_fp = fopen(to, "w");
|
|
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_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size)
|
|
{
|
|
void *ptr;
|
|
loff_t pgoff;
|
|
|
|
pgoff = off_in & ~(page_size - 1);
|
|
off_in -= pgoff;
|
|
|
|
ptr = mmap(NULL, off_in + size, PROT_READ, MAP_PRIVATE, ifd, pgoff);
|
|
if (ptr == MAP_FAILED)
|
|
return -1;
|
|
|
|
while (size) {
|
|
ssize_t ret = pwrite(ofd, ptr + off_in, size, off_out);
|
|
if (ret < 0 && errno == EINTR)
|
|
continue;
|
|
if (ret <= 0)
|
|
break;
|
|
|
|
size -= ret;
|
|
off_in += ret;
|
|
off_out += ret;
|
|
}
|
|
munmap(ptr, off_in + size);
|
|
|
|
return size ? -1 : 0;
|
|
}
|
|
|
|
static int copyfile_mode_ns(const char *from, const char *to, mode_t mode,
|
|
struct nsinfo *nsi)
|
|
{
|
|
int fromfd, tofd;
|
|
struct stat st;
|
|
int err;
|
|
char *tmp = NULL, *ptr = NULL;
|
|
struct nscookie nsc;
|
|
|
|
nsinfo__mountns_enter(nsi, &nsc);
|
|
err = stat(from, &st);
|
|
nsinfo__mountns_exit(&nsc);
|
|
if (err)
|
|
goto out;
|
|
err = -1;
|
|
|
|
/* extra 'x' at the end is to reserve space for '.' */
|
|
if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) {
|
|
tmp = NULL;
|
|
goto out;
|
|
}
|
|
ptr = strrchr(tmp, '/');
|
|
if (!ptr)
|
|
goto out;
|
|
ptr = memmove(ptr + 1, ptr, strlen(ptr) - 1);
|
|
*ptr = '.';
|
|
|
|
tofd = mkstemp(tmp);
|
|
if (tofd < 0)
|
|
goto out;
|
|
|
|
if (fchmod(tofd, mode))
|
|
goto out_close_to;
|
|
|
|
if (st.st_size == 0) { /* /proc? do it slowly... */
|
|
err = slow_copyfile(from, tmp, nsi);
|
|
goto out_close_to;
|
|
}
|
|
|
|
nsinfo__mountns_enter(nsi, &nsc);
|
|
fromfd = open(from, O_RDONLY);
|
|
nsinfo__mountns_exit(&nsc);
|
|
if (fromfd < 0)
|
|
goto out_close_to;
|
|
|
|
err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size);
|
|
|
|
close(fromfd);
|
|
out_close_to:
|
|
close(tofd);
|
|
if (!err)
|
|
err = link(tmp, to);
|
|
unlink(tmp);
|
|
out:
|
|
free(tmp);
|
|
return err;
|
|
}
|
|
|
|
int copyfile_ns(const char *from, const char *to, struct nsinfo *nsi)
|
|
{
|
|
return copyfile_mode_ns(from, to, 0755, nsi);
|
|
}
|
|
|
|
int copyfile_mode(const char *from, const char *to, mode_t mode)
|
|
{
|
|
return copyfile_mode_ns(from, to, mode, NULL);
|
|
}
|
|
|
|
int copyfile(const char *from, const char *to)
|
|
{
|
|
return copyfile_mode(from, to, 0755);
|
|
}
|
|
|
|
static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
|
|
{
|
|
void *buf_start = buf;
|
|
size_t left = n;
|
|
|
|
while (left) {
|
|
/* buf must be treated as const if !is_read. */
|
|
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, const void *buf, size_t n)
|
|
{
|
|
/* ion does not modify buf. */
|
|
return ion(false, fd, (void *)buf, n);
|
|
}
|
|
|
|
size_t hex_width(u64 v)
|
|
{
|
|
size_t n = 1;
|
|
|
|
while ((v >>= 4))
|
|
++n;
|
|
|
|
return n;
|
|
}
|
|
|
|
int perf_event_paranoid(void)
|
|
{
|
|
int value;
|
|
|
|
if (sysctl__read_int("kernel/perf_event_paranoid", &value))
|
|
return INT_MAX;
|
|
|
|
return value;
|
|
}
|
|
static int
|
|
fetch_ubuntu_kernel_version(unsigned int *puint)
|
|
{
|
|
ssize_t len;
|
|
size_t line_len = 0;
|
|
char *ptr, *line = NULL;
|
|
int version, patchlevel, sublevel, err;
|
|
FILE *vsig;
|
|
|
|
if (!puint)
|
|
return 0;
|
|
|
|
vsig = fopen("/proc/version_signature", "r");
|
|
if (!vsig) {
|
|
pr_debug("Open /proc/version_signature failed: %s\n",
|
|
strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
len = getline(&line, &line_len, vsig);
|
|
fclose(vsig);
|
|
err = -1;
|
|
if (len <= 0) {
|
|
pr_debug("Reading from /proc/version_signature failed: %s\n",
|
|
strerror(errno));
|
|
goto errout;
|
|
}
|
|
|
|
ptr = strrchr(line, ' ');
|
|
if (!ptr) {
|
|
pr_debug("Parsing /proc/version_signature failed: %s\n", line);
|
|
goto errout;
|
|
}
|
|
|
|
err = sscanf(ptr + 1, "%d.%d.%d",
|
|
&version, &patchlevel, &sublevel);
|
|
if (err != 3) {
|
|
pr_debug("Unable to get kernel version from /proc/version_signature '%s'\n",
|
|
line);
|
|
goto errout;
|
|
}
|
|
|
|
*puint = (version << 16) + (patchlevel << 8) + sublevel;
|
|
err = 0;
|
|
errout:
|
|
free(line);
|
|
return err;
|
|
}
|
|
|
|
int
|
|
fetch_kernel_version(unsigned int *puint, char *str,
|
|
size_t str_size)
|
|
{
|
|
struct utsname utsname;
|
|
int version, patchlevel, sublevel, err;
|
|
bool int_ver_ready = false;
|
|
|
|
if (access("/proc/version_signature", R_OK) == 0)
|
|
if (!fetch_ubuntu_kernel_version(puint))
|
|
int_ver_ready = true;
|
|
|
|
if (uname(&utsname))
|
|
return -1;
|
|
|
|
if (str && str_size) {
|
|
strncpy(str, utsname.release, str_size);
|
|
str[str_size - 1] = '\0';
|
|
}
|
|
|
|
if (!puint || int_ver_ready)
|
|
return 0;
|
|
|
|
err = sscanf(utsname.release, "%d.%d.%d",
|
|
&version, &patchlevel, &sublevel);
|
|
|
|
if (err != 3) {
|
|
pr_debug("Unable to get kernel version from uname '%s'\n",
|
|
utsname.release);
|
|
return -1;
|
|
}
|
|
|
|
*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: check path of tips.txt or 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;
|
|
}
|
|
|
|
char *perf_exe(char *buf, int len)
|
|
{
|
|
int n = readlink("/proc/self/exe", buf, len);
|
|
if (n > 0) {
|
|
buf[n] = 0;
|
|
return buf;
|
|
}
|
|
return strcpy(buf, "perf");
|
|
}
|