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-rw-r--r--tools/lib/api/fs/cgroup.c95
-rw-r--r--tools/lib/bpf/xsk.c5
-rw-r--r--tools/lib/perf/evlist.c13
-rw-r--r--tools/lib/perf/include/internal/evlist.h2
-rw-r--r--tools/lib/perf/include/perf/event.h18
5 files changed, 93 insertions, 40 deletions
diff --git a/tools/lib/api/fs/cgroup.c b/tools/lib/api/fs/cgroup.c
index 889a6eb4aaca..1573dae4259d 100644
--- a/tools/lib/api/fs/cgroup.c
+++ b/tools/lib/api/fs/cgroup.c
@@ -8,12 +8,29 @@
#include <string.h>
#include "fs.h"
+struct cgroupfs_cache_entry {
+ char subsys[32];
+ char mountpoint[PATH_MAX];
+};
+
+/* just cache last used one */
+static struct cgroupfs_cache_entry cached;
+
int cgroupfs_find_mountpoint(char *buf, size_t maxlen, const char *subsys)
{
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 *line = NULL;
+ size_t len = 0;
+ char *p, *path;
+ char mountpoint[PATH_MAX];
+
+ if (!strcmp(cached.subsys, subsys)) {
+ if (strlen(cached.mountpoint) < maxlen) {
+ strcpy(buf, cached.mountpoint);
+ return 0;
+ }
+ return -1;
+ }
fp = fopen("/proc/mounts", "r");
if (!fp)
@@ -22,45 +39,63 @@ int cgroupfs_find_mountpoint(char *buf, size_t maxlen, const char *subsys)
/*
* 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
+ * the given subsystem. If we found v1, just use it. If not we can
+ * use v2 path as a fallback.
*/
- path_v1[0] = '\0';
- path_v2[0] = '\0';
+ mountpoint[0] = '\0';
- while (fscanf(fp, "%*s %"__stringify(PATH_MAX)"s %"__stringify(PATH_MAX)"s %"
- __stringify(PATH_MAX)"s %*d %*d\n",
- mountpoint, type, tokens) == 3) {
+ /*
+ * The /proc/mounts has the follow format:
+ *
+ * <devname> <mount point> <fs type> <options> ...
+ *
+ */
+ while (getline(&line, &len, fp) != -1) {
+ /* skip devname */
+ p = strchr(line, ' ');
+ if (p == NULL)
+ continue;
+
+ /* save the mount point */
+ path = ++p;
+ p = strchr(p, ' ');
+ if (p == NULL)
+ continue;
- if (!path_v1[0] && !strcmp(type, "cgroup")) {
+ *p++ = '\0';
- token = strtok_r(tokens, ",", &saved_ptr);
+ /* check filesystem type */
+ if (strncmp(p, "cgroup", 6))
+ continue;
- while (token != NULL) {
- if (subsys && !strcmp(token, subsys)) {
- strcpy(path_v1, mountpoint);
- break;
- }
- token = strtok_r(NULL, ",", &saved_ptr);
- }
+ if (p[6] == '2') {
+ /* save cgroup v2 path */
+ strcpy(mountpoint, path);
+ continue;
}
- if (!path_v2[0] && !strcmp(type, "cgroup2"))
- strcpy(path_v2, mountpoint);
+ /* now we have cgroup v1, check the options for subsystem */
+ p += 7;
- if (path_v1[0] && path_v2[0])
- break;
+ p = strstr(p, subsys);
+ if (p == NULL)
+ continue;
+
+ /* sanity check: it should be separated by a space or a comma */
+ if (!strchr(" ,", p[-1]) || !strchr(" ,", p[strlen(subsys)]))
+ continue;
+
+ strcpy(mountpoint, path);
+ break;
}
+ free(line);
fclose(fp);
- if (path_v1[0])
- path = path_v1;
- else if (path_v2[0])
- path = path_v2;
- else
- return -1;
+ strncpy(cached.subsys, subsys, sizeof(cached.subsys) - 1);
+ strcpy(cached.mountpoint, mountpoint);
- if (strlen(path) < maxlen) {
- strcpy(buf, path);
+ if (mountpoint[0] && strlen(mountpoint) < maxlen) {
+ strcpy(buf, mountpoint);
return 0;
}
return -1;
diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c
index ffbb588724d8..526fc35c0b23 100644
--- a/tools/lib/bpf/xsk.c
+++ b/tools/lib/bpf/xsk.c
@@ -610,15 +610,16 @@ static int xsk_lookup_bpf_maps(struct xsk_socket *xsk)
if (fd < 0)
continue;
+ memset(&map_info, 0, map_len);
err = bpf_obj_get_info_by_fd(fd, &map_info, &map_len);
if (err) {
close(fd);
continue;
}
- if (!strcmp(map_info.name, "xsks_map")) {
+ if (!strncmp(map_info.name, "xsks_map", sizeof(map_info.name))) {
ctx->xsks_map_fd = fd;
- continue;
+ break;
}
close(fd);
diff --git a/tools/lib/perf/evlist.c b/tools/lib/perf/evlist.c
index 17465d454a0e..a0aaf385cbb5 100644
--- a/tools/lib/perf/evlist.c
+++ b/tools/lib/perf/evlist.c
@@ -26,13 +26,10 @@
void perf_evlist__init(struct perf_evlist *evlist)
{
- int i;
-
- for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
- INIT_HLIST_HEAD(&evlist->heads[i]);
INIT_LIST_HEAD(&evlist->entries);
evlist->nr_entries = 0;
fdarray__init(&evlist->pollfd, 64);
+ perf_evlist__reset_id_hash(evlist);
}
static void __perf_evlist__propagate_maps(struct perf_evlist *evlist,
@@ -237,6 +234,14 @@ static void perf_evlist__id_hash(struct perf_evlist *evlist,
hlist_add_head(&sid->node, &evlist->heads[hash]);
}
+void perf_evlist__reset_id_hash(struct perf_evlist *evlist)
+{
+ int i;
+
+ for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
+ INIT_HLIST_HEAD(&evlist->heads[i]);
+}
+
void perf_evlist__id_add(struct perf_evlist *evlist,
struct perf_evsel *evsel,
int cpu, int thread, u64 id)
diff --git a/tools/lib/perf/include/internal/evlist.h b/tools/lib/perf/include/internal/evlist.h
index 2d0fa02b036f..212c29063ad4 100644
--- a/tools/lib/perf/include/internal/evlist.h
+++ b/tools/lib/perf/include/internal/evlist.h
@@ -124,4 +124,6 @@ int perf_evlist__id_add_fd(struct perf_evlist *evlist,
struct perf_evsel *evsel,
int cpu, int thread, int fd);
+void perf_evlist__reset_id_hash(struct perf_evlist *evlist);
+
#endif /* __LIBPERF_INTERNAL_EVLIST_H */
diff --git a/tools/lib/perf/include/perf/event.h b/tools/lib/perf/include/perf/event.h
index 988c539bedb6..d82054225fcc 100644
--- a/tools/lib/perf/include/perf/event.h
+++ b/tools/lib/perf/include/perf/event.h
@@ -23,10 +23,20 @@ struct perf_record_mmap2 {
__u64 start;
__u64 len;
__u64 pgoff;
- __u32 maj;
- __u32 min;
- __u64 ino;
- __u64 ino_generation;
+ union {
+ struct {
+ __u32 maj;
+ __u32 min;
+ __u64 ino;
+ __u64 ino_generation;
+ };
+ struct {
+ __u8 build_id_size;
+ __u8 __reserved_1;
+ __u16 __reserved_2;
+ __u8 build_id[20];
+ };
+ };
__u32 prot;
__u32 flags;
char filename[PATH_MAX];
generated by cgit v1.2.3 (git 2.46.0) at 2025-08-18 02:19:19 +0000