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-rw-r--r--tools/perf/util/machine.c4
-rw-r--r--tools/perf/util/map.c23
-rw-r--r--tools/perf/util/map.h2
-rw-r--r--tools/perf/util/namespaces.c83
-rw-r--r--tools/perf/util/namespaces.h5
-rw-r--r--tools/perf/util/symbol.c70
6 files changed, 160 insertions, 27 deletions
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 2e9eb6aa3ce2..246b441110a1 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -1392,7 +1392,7 @@ int machine__process_mmap2_event(struct machine *machine,
map = map__new(machine, event->mmap2.start,
event->mmap2.len, event->mmap2.pgoff,
- event->mmap2.pid, event->mmap2.maj,
+ event->mmap2.maj,
event->mmap2.min, event->mmap2.ino,
event->mmap2.ino_generation,
event->mmap2.prot,
@@ -1450,7 +1450,7 @@ int machine__process_mmap_event(struct machine *machine, union perf_event *event
map = map__new(machine, event->mmap.start,
event->mmap.len, event->mmap.pgoff,
- event->mmap.pid, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0,
event->mmap.filename,
type, thread);
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 5dc60ca5a294..bdaa0a4edc17 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -146,11 +146,13 @@ void map__init(struct map *map, enum map_type type,
}
struct map *map__new(struct machine *machine, u64 start, u64 len,
- u64 pgoff, u32 pid, u32 d_maj, u32 d_min, u64 ino,
+ u64 pgoff, u32 d_maj, u32 d_min, u64 ino,
u64 ino_gen, u32 prot, u32 flags, char *filename,
enum map_type type, struct thread *thread)
{
struct map *map = malloc(sizeof(*map));
+ struct nsinfo *nsi = NULL;
+ struct nsinfo *nnsi;
if (map != NULL) {
char newfilename[PATH_MAX];
@@ -168,9 +170,11 @@ struct map *map__new(struct machine *machine, u64 start, u64 len,
map->ino_generation = ino_gen;
map->prot = prot;
map->flags = flags;
+ nsi = nsinfo__get(thread->nsinfo);
- if ((anon || no_dso) && type == MAP__FUNCTION) {
- snprintf(newfilename, sizeof(newfilename), "/tmp/perf-%d.map", pid);
+ if ((anon || no_dso) && nsi && type == MAP__FUNCTION) {
+ snprintf(newfilename, sizeof(newfilename),
+ "/tmp/perf-%d.map", nsi->pid);
filename = newfilename;
}
@@ -180,6 +184,16 @@ struct map *map__new(struct machine *machine, u64 start, u64 len,
}
if (vdso) {
+ /* The vdso maps are always on the host and not the
+ * container. Ensure that we don't use setns to look
+ * them up.
+ */
+ nnsi = nsinfo__copy(nsi);
+ if (nnsi) {
+ nsinfo__put(nsi);
+ nnsi->need_setns = false;
+ nsi = nnsi;
+ }
pgoff = 0;
dso = machine__findnew_vdso(machine, thread);
} else
@@ -201,11 +215,12 @@ struct map *map__new(struct machine *machine, u64 start, u64 len,
if (type != MAP__FUNCTION)
dso__set_loaded(dso, map->type);
}
- dso->nsinfo = nsinfo__get(thread->nsinfo);
+ dso->nsinfo = nsi;
dso__put(dso);
}
return map;
out_delete:
+ nsinfo__put(nsi);
free(map);
return NULL;
}
diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index f9e8ac8a52cd..73aacf7a7dc4 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -141,7 +141,7 @@ struct thread;
void map__init(struct map *map, enum map_type type,
u64 start, u64 end, u64 pgoff, struct dso *dso);
struct map *map__new(struct machine *machine, u64 start, u64 len,
- u64 pgoff, u32 pid, u32 d_maj, u32 d_min, u64 ino,
+ u64 pgoff, u32 d_maj, u32 d_min, u64 ino,
u64 ino_gen, u32 prot, u32 flags,
char *filename, enum map_type type, struct thread *thread);
struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
diff --git a/tools/perf/util/namespaces.c b/tools/perf/util/namespaces.c
index bcc6bb19cf10..fc5f398779a4 100644
--- a/tools/perf/util/namespaces.c
+++ b/tools/perf/util/namespaces.c
@@ -40,18 +40,23 @@ void namespaces__free(struct namespaces *namespaces)
free(namespaces);
}
-void nsinfo__init(struct nsinfo *nsi)
+int nsinfo__init(struct nsinfo *nsi)
{
char oldns[PATH_MAX];
+ char spath[PATH_MAX];
char *newns = NULL;
+ char *statln = NULL;
struct stat old_stat;
struct stat new_stat;
+ FILE *f = NULL;
+ size_t linesz = 0;
+ int rv = -1;
if (snprintf(oldns, PATH_MAX, "/proc/self/ns/mnt") >= PATH_MAX)
- return;
+ return rv;
if (asprintf(&newns, "/proc/%d/ns/mnt", nsi->pid) == -1)
- return;
+ return rv;
if (stat(oldns, &old_stat) < 0)
goto out;
@@ -68,24 +73,89 @@ void nsinfo__init(struct nsinfo *nsi)
newns = NULL;
}
+ /* If we're dealing with a process that is in a different PID namespace,
+ * attempt to work out the innermost tgid for the process.
+ */
+ if (snprintf(spath, PATH_MAX, "/proc/%d/status", nsi->pid) >= PATH_MAX)
+ goto out;
+
+ f = fopen(spath, "r");
+ if (f == NULL)
+ goto out;
+
+ while (getline(&statln, &linesz, f) != -1) {
+ /* Use tgid if CONFIG_PID_NS is not defined. */
+ if (strstr(statln, "Tgid:") != NULL) {
+ nsi->tgid = (pid_t)strtol(strrchr(statln, '\t'),
+ NULL, 10);
+ nsi->nstgid = nsi->tgid;
+ }
+
+ if (strstr(statln, "NStgid:") != NULL) {
+ nsi->nstgid = (pid_t)strtol(strrchr(statln, '\t'),
+ NULL, 10);
+ break;
+ }
+ }
+ rv = 0;
+
out:
+ if (f != NULL)
+ (void) fclose(f);
+ free(statln);
free(newns);
+ return rv;
}
struct nsinfo *nsinfo__new(pid_t pid)
{
- struct nsinfo *nsi = calloc(1, sizeof(*nsi));
+ struct nsinfo *nsi;
+ if (pid == 0)
+ return NULL;
+
+ nsi = calloc(1, sizeof(*nsi));
if (nsi != NULL) {
nsi->pid = pid;
+ nsi->tgid = pid;
+ nsi->nstgid = pid;
nsi->need_setns = false;
- nsinfo__init(nsi);
+ /* Init may fail if the process exits while we're trying to look
+ * at its proc information. In that case, save the pid but
+ * don't try to enter the namespace.
+ */
+ if (nsinfo__init(nsi) == -1)
+ nsi->need_setns = false;
+
refcount_set(&nsi->refcnt, 1);
}
return nsi;
}
+struct nsinfo *nsinfo__copy(struct nsinfo *nsi)
+{
+ struct nsinfo *nnsi;
+
+ nnsi = calloc(1, sizeof(*nnsi));
+ if (nnsi != NULL) {
+ nnsi->pid = nsi->pid;
+ nnsi->tgid = nsi->tgid;
+ nnsi->nstgid = nsi->nstgid;
+ nnsi->need_setns = nsi->need_setns;
+ if (nsi->mntns_path) {
+ nnsi->mntns_path = strdup(nsi->mntns_path);
+ if (!nnsi->mntns_path) {
+ free(nnsi);
+ return NULL;
+ }
+ }
+ refcount_set(&nnsi->refcnt, 1);
+ }
+
+ return nnsi;
+}
+
void nsinfo__delete(struct nsinfo *nsi)
{
zfree(&nsi->mntns_path);
@@ -105,7 +175,8 @@ void nsinfo__put(struct nsinfo *nsi)
nsinfo__delete(nsi);
}
-void nsinfo__mountns_enter(struct nsinfo *nsi, struct nscookie *nc)
+void nsinfo__mountns_enter(struct nsinfo *nsi,
+ struct nscookie *nc)
{
char curpath[PATH_MAX];
int oldns = -1;
diff --git a/tools/perf/util/namespaces.h b/tools/perf/util/namespaces.h
index b20f6ead7b2d..f19aa41119ae 100644
--- a/tools/perf/util/namespaces.h
+++ b/tools/perf/util/namespaces.h
@@ -26,6 +26,8 @@ void namespaces__free(struct namespaces *namespaces);
struct nsinfo {
pid_t pid;
+ pid_t tgid;
+ pid_t nstgid;
bool need_setns;
char *mntns_path;
refcount_t refcnt;
@@ -36,8 +38,9 @@ struct nscookie {
int newns;
};
-void nsinfo__init(struct nsinfo *nsi);
+int nsinfo__init(struct nsinfo *nsi);
struct nsinfo *nsinfo__new(pid_t pid);
+struct nsinfo *nsinfo__copy(struct nsinfo *nsi);
void nsinfo__delete(struct nsinfo *nsi);
struct nsinfo *nsinfo__get(struct nsinfo *nsi);
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 60a9eaa372ef..21c97cc41cfc 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -19,7 +19,6 @@
#include "strlist.h"
#include "intlist.h"
#include "namespaces.h"
-#include "vdso.h"
#include "header.h"
#include "path.h"
#include "sane_ctype.h"
@@ -1327,14 +1326,15 @@ int dso__load_kallsyms(struct dso *dso, const char *filename,
return __dso__load_kallsyms(dso, filename, map, false);
}
-static int dso__load_perf_map(struct dso *dso, struct map *map)
+static int dso__load_perf_map(const char *map_path, struct dso *dso,
+ struct map *map)
{
char *line = NULL;
size_t n;
FILE *file;
int nr_syms = 0;
- file = fopen(dso->long_name, "r");
+ file = fopen(map_path, "r");
if (file == NULL)
goto out_failure;
@@ -1426,6 +1426,45 @@ static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
}
}
+/* Checks for the existence of the perf-<pid>.map file in two different
+ * locations. First, if the process is a separate mount namespace, check in
+ * that namespace using the pid of the innermost pid namespace. If's not in a
+ * namespace, or the file can't be found there, try in the mount namespace of
+ * the tracing process using our view of its pid.
+ */
+static int dso__find_perf_map(char *filebuf, size_t bufsz,
+ struct nsinfo **nsip)
+{
+ struct nscookie nsc;
+ struct nsinfo *nsi;
+ struct nsinfo *nnsi;
+ int rc = -1;
+
+ nsi = *nsip;
+
+ if (nsi->need_setns) {
+ snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsi->nstgid);
+ nsinfo__mountns_enter(nsi, &nsc);
+ rc = access(filebuf, R_OK);
+ nsinfo__mountns_exit(&nsc);
+ if (rc == 0)
+ return rc;
+ }
+
+ nnsi = nsinfo__copy(nsi);
+ if (nnsi) {
+ nsinfo__put(nsi);
+
+ nnsi->need_setns = false;
+ snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nnsi->tgid);
+ *nsip = nnsi;
+ rc = 0;
+ }
+
+ return rc;
+}
+
+
int dso__load(struct dso *dso, struct map *map)
{
char *name;
@@ -1437,18 +1476,23 @@ int dso__load(struct dso *dso, struct map *map)
struct symsrc ss_[2];
struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
bool kmod;
+ bool perfmap;
unsigned char build_id[BUILD_ID_SIZE];
struct nscookie nsc;
+ char newmapname[PATH_MAX];
+ const char *map_path = dso->long_name;
+
+ perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0;
+ if (perfmap) {
+ if (dso->nsinfo && (dso__find_perf_map(newmapname,
+ sizeof(newmapname), &dso->nsinfo) == 0)) {
+ map_path = newmapname;
+ }
+ }
nsinfo__mountns_enter(dso->nsinfo, &nsc);
pthread_mutex_lock(&dso->lock);
- /* The vdso files always live in the host container, so don't go looking
- * for them in the container's mount namespace.
- */
- if (dso__is_vdso(dso))
- nsinfo__mountns_exit(&nsc);
-
/* check again under the dso->lock */
if (dso__loaded(dso, map->type)) {
ret = 1;
@@ -1471,19 +1515,19 @@ int dso__load(struct dso *dso, struct map *map)
dso->adjust_symbols = 0;
- if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
+ if (perfmap) {
struct stat st;
- if (lstat(dso->name, &st) < 0)
+ if (lstat(map_path, &st) < 0)
goto out;
if (!symbol_conf.force && st.st_uid && (st.st_uid != geteuid())) {
pr_warning("File %s not owned by current user or root, "
- "ignoring it (use -f to override).\n", dso->name);
+ "ignoring it (use -f to override).\n", map_path);
goto out;
}
- ret = dso__load_perf_map(dso, map);
+ ret = dso__load_perf_map(map_path, dso, map);
dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
DSO_BINARY_TYPE__NOT_FOUND;
goto out;
generated by cgit v1.2.3 (git 2.39.1) at 2024-08-22 09:30:21 +0000