diff options
Diffstat (limited to 'tools/perf/util/cgroup.c')
-rw-r--r-- | tools/perf/util/cgroup.c | 451 |
1 files changed, 388 insertions, 63 deletions
diff --git a/tools/perf/util/cgroup.c b/tools/perf/util/cgroup.c index 4881d4af3381..e99b41f9be45 100644 --- a/tools/perf/util/cgroup.c +++ b/tools/perf/util/cgroup.c @@ -3,92 +3,91 @@ #include "evsel.h" #include "cgroup.h" #include "evlist.h" -#include <linux/stringify.h> +#include "rblist.h" +#include "metricgroup.h" +#include "stat.h" #include <linux/zalloc.h> #include <sys/types.h> #include <sys/stat.h> +#include <sys/statfs.h> #include <fcntl.h> #include <stdlib.h> #include <string.h> +#include <api/fs/fs.h> +#include <ftw.h> +#include <regex.h> int nr_cgroups; +bool cgrp_event_expanded; -static int -cgroupfs_find_mountpoint(char *buf, size_t maxlen) +/* used to match cgroup name with patterns */ +struct cgroup_name { + struct list_head list; + bool used; + char name[]; +}; +static LIST_HEAD(cgroup_list); + +static int open_cgroup(const char *name) { - FILE *fp; - char mountpoint[PATH_MAX + 1], tokens[PATH_MAX + 1], type[PATH_MAX + 1]; - char path_v1[PATH_MAX + 1], path_v2[PATH_MAX + 2], *path; - char *token, *saved_ptr = NULL; + char path[PATH_MAX + 1]; + char mnt[PATH_MAX + 1]; + int fd; - fp = fopen("/proc/mounts", "r"); - if (!fp) - return -1; - /* - * in order to handle split hierarchy, we need to scan /proc/mounts - * and inspect every cgroupfs mount point to find one that has - * perf_event subsystem - */ - path_v1[0] = '\0'; - path_v2[0] = '\0'; + if (cgroupfs_find_mountpoint(mnt, PATH_MAX + 1, "perf_event")) + return -1; - while (fscanf(fp, "%*s %"__stringify(PATH_MAX)"s %"__stringify(PATH_MAX)"s %" - __stringify(PATH_MAX)"s %*d %*d\n", - mountpoint, type, tokens) == 3) { + scnprintf(path, PATH_MAX, "%s/%s", mnt, name); - if (!path_v1[0] && !strcmp(type, "cgroup")) { + fd = open(path, O_RDONLY); + if (fd == -1) + fprintf(stderr, "no access to cgroup %s\n", path); - token = strtok_r(tokens, ",", &saved_ptr); + return fd; +} - while (token != NULL) { - if (!strcmp(token, "perf_event")) { - strcpy(path_v1, mountpoint); - break; - } - token = strtok_r(NULL, ",", &saved_ptr); - } - } +#ifdef HAVE_FILE_HANDLE +int read_cgroup_id(struct cgroup *cgrp) +{ + char path[PATH_MAX + 1]; + char mnt[PATH_MAX + 1]; + struct { + struct file_handle fh; + uint64_t cgroup_id; + } handle; + int mount_id; - if (!path_v2[0] && !strcmp(type, "cgroup2")) - strcpy(path_v2, mountpoint); + if (cgroupfs_find_mountpoint(mnt, PATH_MAX + 1, "perf_event")) + return -1; - if (path_v1[0] && path_v2[0]) - break; - } - fclose(fp); + scnprintf(path, PATH_MAX, "%s/%s", mnt, cgrp->name); - if (path_v1[0]) - path = path_v1; - else if (path_v2[0]) - path = path_v2; - else + handle.fh.handle_bytes = sizeof(handle.cgroup_id); + if (name_to_handle_at(AT_FDCWD, path, &handle.fh, &mount_id, 0) < 0) return -1; - if (strlen(path) < maxlen) { - strcpy(buf, path); - return 0; - } - return -1; + cgrp->id = handle.cgroup_id; + return 0; } +#endif /* HAVE_FILE_HANDLE */ -static int open_cgroup(const char *name) +#ifndef CGROUP2_SUPER_MAGIC +#define CGROUP2_SUPER_MAGIC 0x63677270 +#endif + +int cgroup_is_v2(const char *subsys) { - char path[PATH_MAX + 1]; char mnt[PATH_MAX + 1]; - int fd; - + struct statfs stbuf; - if (cgroupfs_find_mountpoint(mnt, PATH_MAX + 1)) + if (cgroupfs_find_mountpoint(mnt, PATH_MAX + 1, subsys)) return -1; - scnprintf(path, PATH_MAX, "%s/%s", mnt, name); - - fd = open(path, O_RDONLY); - if (fd == -1) - fprintf(stderr, "no access to cgroup %s\n", path); + if (statfs(mnt, &stbuf) < 0) + return -1; - return fd; + return (stbuf.f_type == CGROUP2_SUPER_MAGIC); } static struct cgroup *evlist__find_cgroup(struct evlist *evlist, const char *str) @@ -107,7 +106,7 @@ static struct cgroup *evlist__find_cgroup(struct evlist *evlist, const char *str return NULL; } -static struct cgroup *cgroup__new(const char *name) +static struct cgroup *cgroup__new(const char *name, bool do_open) { struct cgroup *cgroup = zalloc(sizeof(*cgroup)); @@ -117,9 +116,14 @@ static struct cgroup *cgroup__new(const char *name) cgroup->name = strdup(name); if (!cgroup->name) goto out_err; - cgroup->fd = open_cgroup(name); - if (cgroup->fd == -1) - goto out_free_name; + + if (do_open) { + cgroup->fd = open_cgroup(name); + if (cgroup->fd == -1) + goto out_free_name; + } else { + cgroup->fd = -1; + } } return cgroup; @@ -135,7 +139,7 @@ struct cgroup *evlist__findnew_cgroup(struct evlist *evlist, const char *name) { struct cgroup *cgroup = evlist__find_cgroup(evlist, name); - return cgroup ?: cgroup__new(name); + return cgroup ?: cgroup__new(name, true); } static int add_cgroup(struct evlist *evlist, const char *str) @@ -166,7 +170,8 @@ found: static void cgroup__delete(struct cgroup *cgroup) { - close(cgroup->fd); + if (cgroup->fd >= 0) + close(cgroup->fd); zfree(&cgroup->name); free(cgroup); } @@ -199,6 +204,137 @@ void evlist__set_default_cgroup(struct evlist *evlist, struct cgroup *cgroup) evsel__set_default_cgroup(evsel, cgroup); } +/* helper function for ftw() in match_cgroups and list_cgroups */ +static int add_cgroup_name(const char *fpath, const struct stat *sb __maybe_unused, + int typeflag, struct FTW *ftwbuf __maybe_unused) +{ + struct cgroup_name *cn; + + if (typeflag != FTW_D) + return 0; + + cn = malloc(sizeof(*cn) + strlen(fpath) + 1); + if (cn == NULL) + return -1; + + cn->used = false; + strcpy(cn->name, fpath); + + list_add_tail(&cn->list, &cgroup_list); + return 0; +} + +static void release_cgroup_list(void) +{ + struct cgroup_name *cn; + + while (!list_empty(&cgroup_list)) { + cn = list_first_entry(&cgroup_list, struct cgroup_name, list); + list_del(&cn->list); + free(cn); + } +} + +/* collect given cgroups only */ +static int list_cgroups(const char *str) +{ + const char *p, *e, *eos = str + strlen(str); + struct cgroup_name *cn; + char *s; + + /* use given name as is - for testing purpose */ + for (;;) { + p = strchr(str, ','); + e = p ? p : eos; + + if (e - str) { + int ret; + + s = strndup(str, e - str); + if (!s) + return -1; + /* pretend if it's added by ftw() */ + ret = add_cgroup_name(s, NULL, FTW_D, NULL); + free(s); + if (ret) + return -1; + } else { + if (add_cgroup_name("", NULL, FTW_D, NULL) < 0) + return -1; + } + + if (!p) + break; + str = p+1; + } + + /* these groups will be used */ + list_for_each_entry(cn, &cgroup_list, list) + cn->used = true; + + return 0; +} + +/* collect all cgroups first and then match with the pattern */ +static int match_cgroups(const char *str) +{ + char mnt[PATH_MAX]; + const char *p, *e, *eos = str + strlen(str); + struct cgroup_name *cn; + regex_t reg; + int prefix_len; + char *s; + + if (cgroupfs_find_mountpoint(mnt, sizeof(mnt), "perf_event")) + return -1; + + /* cgroup_name will have a full path, skip the root directory */ + prefix_len = strlen(mnt); + + /* collect all cgroups in the cgroup_list */ + if (nftw(mnt, add_cgroup_name, 20, 0) < 0) + return -1; + + for (;;) { + p = strchr(str, ','); + e = p ? p : eos; + + /* allow empty cgroups, i.e., skip */ + if (e - str) { + /* termination added */ + s = strndup(str, e - str); + if (!s) + return -1; + if (regcomp(®, s, REG_NOSUB)) { + free(s); + return -1; + } + + /* check cgroup name with the pattern */ + list_for_each_entry(cn, &cgroup_list, list) { + char *name = cn->name + prefix_len; + + if (name[0] == '/' && name[1]) + name++; + if (!regexec(®, name, 0, NULL, 0)) + cn->used = true; + } + regfree(®); + free(s); + } else { + /* first entry to root cgroup */ + cn = list_first_entry(&cgroup_list, struct cgroup_name, + list); + cn->used = true; + } + + if (!p) + break; + str = p+1; + } + return prefix_len; +} + int parse_cgroups(const struct option *opt, const char *str, int unset __maybe_unused) { @@ -250,3 +386,192 @@ int parse_cgroups(const struct option *opt, const char *str, } return 0; } + +static bool has_pattern_string(const char *str) +{ + return !!strpbrk(str, "{}[]()|*+?^$"); +} + +int evlist__expand_cgroup(struct evlist *evlist, const char *str, + struct rblist *metric_events, bool open_cgroup) +{ + struct evlist *orig_list, *tmp_list; + struct evsel *pos, *evsel, *leader; + struct rblist orig_metric_events; + struct cgroup *cgrp = NULL; + struct cgroup_name *cn; + int ret = -1; + int prefix_len; + + if (evlist->core.nr_entries == 0) { + fprintf(stderr, "must define events before cgroups\n"); + return -EINVAL; + } + + orig_list = evlist__new(); + tmp_list = evlist__new(); + if (orig_list == NULL || tmp_list == NULL) { + fprintf(stderr, "memory allocation failed\n"); + return -ENOMEM; + } + + /* save original events and init evlist */ + evlist__splice_list_tail(orig_list, &evlist->core.entries); + evlist->core.nr_entries = 0; + + if (metric_events) { + orig_metric_events = *metric_events; + rblist__init(metric_events); + } else { + rblist__init(&orig_metric_events); + } + + if (has_pattern_string(str)) + prefix_len = match_cgroups(str); + else + prefix_len = list_cgroups(str); + + if (prefix_len < 0) + goto out_err; + + list_for_each_entry(cn, &cgroup_list, list) { + char *name; + + if (!cn->used) + continue; + + /* cgroup_name might have a full path, skip the prefix */ + name = cn->name + prefix_len; + if (name[0] == '/' && name[1]) + name++; + cgrp = cgroup__new(name, open_cgroup); + if (cgrp == NULL) + goto out_err; + + leader = NULL; + evlist__for_each_entry(orig_list, pos) { + evsel = evsel__clone(pos); + if (evsel == NULL) + goto out_err; + + cgroup__put(evsel->cgrp); + evsel->cgrp = cgroup__get(cgrp); + + if (evsel__is_group_leader(pos)) + leader = evsel; + evsel__set_leader(evsel, leader); + + evlist__add(tmp_list, evsel); + } + /* cgroup__new() has a refcount, release it here */ + cgroup__put(cgrp); + nr_cgroups++; + + if (metric_events) { + perf_stat__collect_metric_expr(tmp_list); + if (metricgroup__copy_metric_events(tmp_list, cgrp, + metric_events, + &orig_metric_events) < 0) + goto out_err; + } + + evlist__splice_list_tail(evlist, &tmp_list->core.entries); + tmp_list->core.nr_entries = 0; + } + + if (list_empty(&evlist->core.entries)) { + fprintf(stderr, "no cgroup matched: %s\n", str); + goto out_err; + } + + ret = 0; + cgrp_event_expanded = true; + +out_err: + evlist__delete(orig_list); + evlist__delete(tmp_list); + rblist__exit(&orig_metric_events); + release_cgroup_list(); + + return ret; +} + +static struct cgroup *__cgroup__findnew(struct rb_root *root, uint64_t id, + bool create, const char *path) +{ + struct rb_node **p = &root->rb_node; + struct rb_node *parent = NULL; + struct cgroup *cgrp; + + while (*p != NULL) { + parent = *p; + cgrp = rb_entry(parent, struct cgroup, node); + + if (cgrp->id == id) + return cgrp; + + if (cgrp->id < id) + p = &(*p)->rb_left; + else + p = &(*p)->rb_right; + } + + if (!create) + return NULL; + + cgrp = malloc(sizeof(*cgrp)); + if (cgrp == NULL) + return NULL; + + cgrp->name = strdup(path); + if (cgrp->name == NULL) { + free(cgrp); + return NULL; + } + + cgrp->fd = -1; + cgrp->id = id; + refcount_set(&cgrp->refcnt, 1); + + rb_link_node(&cgrp->node, parent, p); + rb_insert_color(&cgrp->node, root); + + return cgrp; +} + +struct cgroup *cgroup__findnew(struct perf_env *env, uint64_t id, + const char *path) +{ + struct cgroup *cgrp; + + down_write(&env->cgroups.lock); + cgrp = __cgroup__findnew(&env->cgroups.tree, id, true, path); + up_write(&env->cgroups.lock); + return cgrp; +} + +struct cgroup *cgroup__find(struct perf_env *env, uint64_t id) +{ + struct cgroup *cgrp; + + down_read(&env->cgroups.lock); + cgrp = __cgroup__findnew(&env->cgroups.tree, id, false, NULL); + up_read(&env->cgroups.lock); + return cgrp; +} + +void perf_env__purge_cgroups(struct perf_env *env) +{ + struct rb_node *node; + struct cgroup *cgrp; + + down_write(&env->cgroups.lock); + while (!RB_EMPTY_ROOT(&env->cgroups.tree)) { + node = rb_first(&env->cgroups.tree); + cgrp = rb_entry(node, struct cgroup, node); + + rb_erase(node, &env->cgroups.tree); + cgroup__put(cgrp); + } + up_write(&env->cgroups.lock); +} |