diff options
Diffstat (limited to '')
| -rw-r--r-- | tools/perf/util/util.c | 154 |
1 files changed, 145 insertions, 9 deletions
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c index 969ae560dad9..391c1e928bd7 100644 --- a/tools/perf/util/util.c +++ b/tools/perf/util/util.c @@ -18,6 +18,7 @@ #include <linux/kernel.h> #include <linux/log2.h> #include <linux/time64.h> +#include <linux/overflow.h> #include <unistd.h> #include "cap.h" #include "strlist.h" @@ -55,6 +56,24 @@ int sysctl__max_stack(void) return sysctl_perf_event_max_stack; } +bool sysctl__nmi_watchdog_enabled(void) +{ + static bool cached; + static bool nmi_watchdog; + int value; + + if (cached) + return nmi_watchdog; + + if (sysctl__read_int("kernel/nmi_watchdog", &value) < 0) + return false; + + nmi_watchdog = (value > 0) ? true : false; + cached = true; + + return nmi_watchdog; +} + bool test_attr__enabled; bool perf_host = true; @@ -182,7 +201,7 @@ static int rm_rf_depth_pat(const char *path, int depth, const char **pat) return rmdir(path); } -static int rm_rf_kcore_dir(const char *path) +static int rm_rf_a_kcore_dir(const char *path, const char *name) { char kcore_dir_path[PATH_MAX]; const char *pat[] = { @@ -192,11 +211,44 @@ static int rm_rf_kcore_dir(const char *path) NULL, }; - snprintf(kcore_dir_path, sizeof(kcore_dir_path), "%s/kcore_dir", path); + snprintf(kcore_dir_path, sizeof(kcore_dir_path), "%s/%s", path, name); return rm_rf_depth_pat(kcore_dir_path, 0, pat); } +static bool kcore_dir_filter(const char *name __maybe_unused, struct dirent *d) +{ + const char *pat[] = { + "kcore_dir", + "kcore_dir__[1-9]*", + NULL, + }; + + return match_pat(d->d_name, pat); +} + +static int rm_rf_kcore_dir(const char *path) +{ + struct strlist *kcore_dirs; + struct str_node *nd; + int ret; + + kcore_dirs = lsdir(path, kcore_dir_filter); + + if (!kcore_dirs) + return 0; + + strlist__for_each_entry(nd, kcore_dirs) { + ret = rm_rf_a_kcore_dir(path, nd->s); + if (ret) + return ret; + } + + strlist__delete(kcore_dirs); + + return 0; +} + int rm_rf_perf_data(const char *path) { const char *pat[] = { @@ -272,6 +324,7 @@ int perf_event_paranoid(void) bool perf_event_paranoid_check(int max_level) { return perf_cap__capable(CAP_SYS_ADMIN) || + perf_cap__capable(CAP_PERFMON) || perf_event_paranoid() <= max_level; } @@ -360,32 +413,32 @@ fetch_kernel_version(unsigned int *puint, char *str, return 0; } -const char *perf_tip(const char *dirpath) +int perf_tip(char **strp, const char *dirpath) { struct strlist *tips; struct str_node *node; - char *tip = NULL; struct strlist_config conf = { .dirname = dirpath, .file_only = true, }; + int ret = 0; + *strp = NULL; tips = strlist__new("tips.txt", &conf); if (tips == NULL) - return errno == ENOENT ? NULL : - "Tip: check path of tips.txt or get more memory! ;-p"; + return -errno; 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! ;-)"; + if (asprintf(strp, "Tip: %s", node->s) < 0) + ret = -ENOMEM; out: strlist__delete(tips); - return tip; + return ret; } char *perf_exe(char *buf, int len) @@ -397,3 +450,86 @@ char *perf_exe(char *buf, int len) } return strcpy(buf, "perf"); } + +void perf_debuginfod_setup(struct perf_debuginfod *di) +{ + /* + * By default '!di->set' we clear DEBUGINFOD_URLS, so debuginfod + * processing is not triggered, otherwise we set it to 'di->urls' + * value. If 'di->urls' is "system" we keep DEBUGINFOD_URLS value. + */ + if (!di->set) + setenv("DEBUGINFOD_URLS", "", 1); + else if (di->urls && strcmp(di->urls, "system")) + setenv("DEBUGINFOD_URLS", di->urls, 1); + + pr_debug("DEBUGINFOD_URLS=%s\n", getenv("DEBUGINFOD_URLS")); + +#ifndef HAVE_DEBUGINFOD_SUPPORT + if (di->set) + pr_warning("WARNING: debuginfod support requested, but perf is not built with it\n"); +#endif +} + +/* + * Return a new filename prepended with task's root directory if it's in + * a chroot. Callers should free the returned string. + */ +char *filename_with_chroot(int pid, const char *filename) +{ + char buf[PATH_MAX]; + char proc_root[32]; + char *new_name = NULL; + int ret; + + scnprintf(proc_root, sizeof(proc_root), "/proc/%d/root", pid); + ret = readlink(proc_root, buf, sizeof(buf) - 1); + if (ret <= 0) + return NULL; + + /* readlink(2) does not append a null byte to buf */ + buf[ret] = '\0'; + + if (!strcmp(buf, "/")) + return NULL; + + if (strstr(buf, "(deleted)")) + return NULL; + + if (asprintf(&new_name, "%s/%s", buf, filename) < 0) + return NULL; + + return new_name; +} + +/* + * Reallocate an array *arr of size *arr_sz so that it is big enough to contain + * x elements of size msz, initializing new entries to *init_val or zero if + * init_val is NULL + */ +int do_realloc_array_as_needed(void **arr, size_t *arr_sz, size_t x, size_t msz, const void *init_val) +{ + size_t new_sz = *arr_sz; + void *new_arr; + size_t i; + + if (!new_sz) + new_sz = msz >= 64 ? 1 : roundup(64, msz); /* Start with at least 64 bytes */ + while (x >= new_sz) { + if (check_mul_overflow(new_sz, (size_t)2, &new_sz)) + return -ENOMEM; + } + if (new_sz == *arr_sz) + return 0; + new_arr = calloc(new_sz, msz); + if (!new_arr) + return -ENOMEM; + memcpy(new_arr, *arr, *arr_sz * msz); + if (init_val) { + for (i = *arr_sz; i < new_sz; i++) + memcpy(new_arr + (i * msz), init_val, msz); + } + *arr = new_arr; + *arr_sz = new_sz; + return 0; +} |