[PATCH tip/perf/core 2/7] perf maps: lookup maps in both intitial mountns and inner mountns.

From: Krister Johansen
Date: Fri Jun 30 2017 - 22:20:49 EST

If a process is in a mountns and has symbols in /tmp/perf-<pid>.map,
look first in the namespace using the tgid for the pidns that the
process might be in. If the map isn't found there, try looking in
the mountns where perf is running, and use the tgid that's appropriate
for perf's pid namespace. If all else fails, use the original pid.

This allows us to locate a symbol map file in the mount namespace, if
it was generated there. However, we also try the tool's /tmp in case
it's there instead.

Signed-off-by: Krister Johansen <kjlx@xxxxxxxxxxxxxxxxxx>
---
tools/perf/util/machine.c | 19 ++++------
tools/perf/util/map.c | 29 ++++++++++++----
tools/perf/util/map.h | 8 ++---
tools/perf/util/namespaces.c | 83 ++++++++++++++++++++++++++++++++++++++++----
tools/perf/util/namespaces.h | 5 ++-
tools/perf/util/symbol.c | 71 ++++++++++++++++++++++++++++++-------
6 files changed, 172 insertions(+), 43 deletions(-)

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index d7f31cb..ed98881 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -1388,13 +1388,10 @@ int machine__process_mmap2_event(struct machine *machine,
else
type = MAP__FUNCTION;

- map = map__new(machine, event->mmap2.start,
- event->mmap2.len, event->mmap2.pgoff,
- event->mmap2.pid, event->mmap2.maj,
- event->mmap2.min, event->mmap2.ino,
- event->mmap2.ino_generation,
- event->mmap2.prot,
- event->mmap2.flags,
+ map = map__new(machine, event->mmap2.start, event->mmap2.len,
+ event->mmap2.pgoff, event->mmap2.maj, event->mmap2.min,
+ event->mmap2.ino, event->mmap2.ino_generation,
+ event->mmap2.prot, event->mmap2.flags,
event->mmap2.filename, type, thread);

if (map == NULL)
@@ -1446,11 +1443,9 @@ int machine__process_mmap_event(struct machine *machine, union perf_event *event
else
type = MAP__FUNCTION;

- map = map__new(machine, event->mmap.start,
- event->mmap.len, event->mmap.pgoff,
- event->mmap.pid, 0, 0, 0, 0, 0, 0,
- event->mmap.filename,
- type, thread);
+ map = map__new(machine, event->mmap.start, event->mmap.len,
+ event->mmap.pgoff, 0, 0, 0, 0, 0, 0,
+ event->mmap.filename, type, thread);

if (map == NULL)
goto out_problem_map;
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 5dc60ca..2bd20cb 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -145,12 +145,14 @@ void map__init(struct map *map, enum map_type type,
refcount_set(&map->refcnt, 1);
}

-struct map *map__new(struct machine *machine, u64 start, u64 len,
- u64 pgoff, u32 pid, 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__new(struct machine *machine, u64 start, u64 len, 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 f9e8ac8..bf015a93 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -140,10 +140,10 @@ 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 ino_gen, u32 prot, u32 flags,
- char *filename, enum map_type type, struct thread *thread);
+struct map *map__new(struct machine *machine, u64 start, u64 len, 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);
void map__delete(struct map *map);
struct map *map__clone(struct map *map);
diff --git a/tools/perf/util/namespaces.c b/tools/perf/util/namespaces.c
index d7f31e0..cad7d8b 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)
{
free(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 b20f6ea..f19aa41 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 60a9eaa..97e454f 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 +1515,20 @@ 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;
--
2.7.4