[tip:perf/core] perf buildid-cache: Support binary objects from other namespaces

From: tip-bot for Krister Johansen
Date: Thu Jul 20 2017 - 04:53:33 EST

Commit-ID: f045b8c4b36baddcfbdd4d3d956446e688b0b3cd
Gitweb: http://git.kernel.org/tip/f045b8c4b36baddcfbdd4d3d956446e688b0b3cd
Author: Krister Johansen <kjlx@xxxxxxxxxxxxxxxxxx>
AuthorDate: Wed, 5 Jul 2017 18:48:11 -0700
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Tue, 18 Jul 2017 23:14:11 -0300

perf buildid-cache: Support binary objects from other namespaces

Teach buildid-cache how to add, remove, and update binary objects from
other mount namespaces. Allow probe events tracing binaries in
different namespaces to add their objects to the probe and build-id
caches too. As a handy side effect, this also lets us access SDT probes
in binaries from alternate mount namespaces.

Signed-off-by: Krister Johansen <kjlx@xxxxxxxxxxxxxxxxxx>
Tested-by: Brendan Gregg <brendan.d.gregg@xxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas-Mich Richter <tmricht@xxxxxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1499305693-1599-5-git-send-email-kjlx@xxxxxxxxxxxxxxxxxx
[ Add util/namespaces.c to tools/perf/util/python-ext-sources, to fix the python binding 'perf test' ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/Documentation/perf-buildid-cache.txt | 5 +++
tools/perf/Documentation/perf-probe.txt | 5 +++
tools/perf/builtin-buildid-cache.c | 52 ++++++++++++++++++-------
tools/perf/builtin-probe.c | 2 +-
tools/perf/tests/sdt.c | 4 +-
tools/perf/util/build-id.c | 47 ++++++++++++++--------
tools/perf/util/build-id.h | 9 +++--
tools/perf/util/dso.c | 12 +++++-
tools/perf/util/parse-events.c | 2 +-
tools/perf/util/probe-event.c | 6 +--
tools/perf/util/probe-file.c | 19 +++++----
tools/perf/util/probe-file.h | 4 +-
tools/perf/util/python-ext-sources | 1 +
tools/perf/util/symbol.c | 19 ++++++---
tools/perf/util/util.c | 34 +++++++++++++---
tools/perf/util/util.h | 2 +
16 files changed, 160 insertions(+), 63 deletions(-)

diff --git a/tools/perf/Documentation/perf-buildid-cache.txt b/tools/perf/Documentation/perf-buildid-cache.txt
index 058064d..8468100 100644
--- a/tools/perf/Documentation/perf-buildid-cache.txt
+++ b/tools/perf/Documentation/perf-buildid-cache.txt
@@ -61,6 +61,11 @@ OPTIONS
--verbose::
Be more verbose.

+--target-ns=PID:
+ Obtain mount namespace information from the target pid. This is
+ used when creating a uprobe for a process that resides in a
+ different mount namespace from the perf(1) utility.
+
SEE ALSO
--------
linkperf:perf-record[1], linkperf:perf-report[1], linkperf:perf-buildid-list[1]
diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt
index a42aabc..d7e4869 100644
--- a/tools/perf/Documentation/perf-probe.txt
+++ b/tools/perf/Documentation/perf-probe.txt
@@ -273,6 +273,11 @@ Add a uprobe to a target process running in a different mount namespace

./perf probe --target-ns <target pid> -x /lib64/libc.so.6 malloc

+Add a USDT probe to a target process running in a different mount namespace
+
+ ./perf probe --target-ns <target pid> -x /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.121-0.b13.el7_3.x86_64/jre/lib/amd64/server/libjvm.so %sdt_hotspot:thread__sleep__end
+
+
SEE ALSO
--------
linkperf:perf-trace[1], linkperf:perf-record[1], linkperf:perf-buildid-cache[1]
diff --git a/tools/perf/builtin-buildid-cache.c b/tools/perf/builtin-buildid-cache.c
index 9eba7f1..d65bd86 100644
--- a/tools/perf/builtin-buildid-cache.c
+++ b/tools/perf/builtin-buildid-cache.c
@@ -14,6 +14,7 @@
#include <unistd.h>
#include "builtin.h"
#include "perf.h"
+#include "namespaces.h"
#include "util/cache.h"
#include "util/debug.h"
#include "util/header.h"
@@ -165,33 +166,41 @@ static int build_id_cache__add_kcore(const char *filename, bool force)
return 0;
}

-static int build_id_cache__add_file(const char *filename)
+static int build_id_cache__add_file(const char *filename, struct nsinfo *nsi)
{
char sbuild_id[SBUILD_ID_SIZE];
u8 build_id[BUILD_ID_SIZE];
int err;
+ struct nscookie nsc;

- if (filename__read_build_id(filename, &build_id, sizeof(build_id)) < 0) {
+ nsinfo__mountns_enter(nsi, &nsc);
+ err = filename__read_build_id(filename, &build_id, sizeof(build_id));
+ nsinfo__mountns_exit(&nsc);
+ if (err < 0) {
pr_debug("Couldn't read a build-id in %s\n", filename);
return -1;
}

build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
- err = build_id_cache__add_s(sbuild_id, filename,
+ err = build_id_cache__add_s(sbuild_id, filename, nsi,
false, false);
pr_debug("Adding %s %s: %s\n", sbuild_id, filename,
err ? "FAIL" : "Ok");
return err;
}

-static int build_id_cache__remove_file(const char *filename)
+static int build_id_cache__remove_file(const char *filename, struct nsinfo *nsi)
{
u8 build_id[BUILD_ID_SIZE];
char sbuild_id[SBUILD_ID_SIZE];
+ struct nscookie nsc;

int err;

- if (filename__read_build_id(filename, &build_id, sizeof(build_id)) < 0) {
+ nsinfo__mountns_enter(nsi, &nsc);
+ err = filename__read_build_id(filename, &build_id, sizeof(build_id));
+ nsinfo__mountns_exit(&nsc);
+ if (err < 0) {
pr_debug("Couldn't read a build-id in %s\n", filename);
return -1;
}
@@ -204,13 +213,13 @@ static int build_id_cache__remove_file(const char *filename)
return err;
}

-static int build_id_cache__purge_path(const char *pathname)
+static int build_id_cache__purge_path(const char *pathname, struct nsinfo *nsi)
{
struct strlist *list;
struct str_node *pos;
int err;

- err = build_id_cache__list_build_ids(pathname, &list);
+ err = build_id_cache__list_build_ids(pathname, nsi, &list);
if (err)
goto out;

@@ -256,24 +265,30 @@ static int build_id_cache__fprintf_missing(struct perf_session *session, FILE *f
return 0;
}

-static int build_id_cache__update_file(const char *filename)
+static int build_id_cache__update_file(const char *filename, struct nsinfo *nsi)
{
u8 build_id[BUILD_ID_SIZE];
char sbuild_id[SBUILD_ID_SIZE];
+ struct nscookie nsc;

- int err = 0;
+ int err;

- if (filename__read_build_id(filename, &build_id, sizeof(build_id)) < 0) {
+ nsinfo__mountns_enter(nsi, &nsc);
+ err = filename__read_build_id(filename, &build_id, sizeof(build_id));
+ nsinfo__mountns_exit(&nsc);
+ if (err < 0) {
pr_debug("Couldn't read a build-id in %s\n", filename);
return -1;
}
+ err = 0;

build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
if (build_id_cache__cached(sbuild_id))
err = build_id_cache__remove_s(sbuild_id);

if (!err)
- err = build_id_cache__add_s(sbuild_id, filename, false, false);
+ err = build_id_cache__add_s(sbuild_id, filename, nsi, false,
+ false);

pr_debug("Updating %s %s: %s\n", sbuild_id, filename,
err ? "FAIL" : "Ok");
@@ -286,6 +301,7 @@ int cmd_buildid_cache(int argc, const char **argv)
struct strlist *list;
struct str_node *pos;
int ret = 0;
+ int ns_id = -1;
bool force = false;
char const *add_name_list_str = NULL,
*remove_name_list_str = NULL,
@@ -299,6 +315,7 @@ int cmd_buildid_cache(int argc, const char **argv)
.mode = PERF_DATA_MODE_READ,
};
struct perf_session *session = NULL;
+ struct nsinfo *nsi = NULL;

const struct option buildid_cache_options[] = {
OPT_STRING('a', "add", &add_name_list_str,
@@ -315,6 +332,7 @@ int cmd_buildid_cache(int argc, const char **argv)
OPT_STRING('u', "update", &update_name_list_str, "file list",
"file(s) to update"),
OPT_INCR('v', "verbose", &verbose, "be more verbose"),
+ OPT_INTEGER(0, "target-ns", &ns_id, "target pid for namespace context"),
OPT_END()
};
const char * const buildid_cache_usage[] = {
@@ -330,6 +348,9 @@ int cmd_buildid_cache(int argc, const char **argv)
!missing_filename && !update_name_list_str))
usage_with_options(buildid_cache_usage, buildid_cache_options);

+ if (ns_id > 0)
+ nsi = nsinfo__new(ns_id);
+
if (missing_filename) {
file.path = missing_filename;
file.force = force;
@@ -348,7 +369,7 @@ int cmd_buildid_cache(int argc, const char **argv)
list = strlist__new(add_name_list_str, NULL);
if (list) {
strlist__for_each_entry(pos, list)
- if (build_id_cache__add_file(pos->s)) {
+ if (build_id_cache__add_file(pos->s, nsi)) {
if (errno == EEXIST) {
pr_debug("%s already in the cache\n",
pos->s);
@@ -366,7 +387,7 @@ int cmd_buildid_cache(int argc, const char **argv)
list = strlist__new(remove_name_list_str, NULL);
if (list) {
strlist__for_each_entry(pos, list)
- if (build_id_cache__remove_file(pos->s)) {
+ if (build_id_cache__remove_file(pos->s, nsi)) {
if (errno == ENOENT) {
pr_debug("%s wasn't in the cache\n",
pos->s);
@@ -384,7 +405,7 @@ int cmd_buildid_cache(int argc, const char **argv)
list = strlist__new(purge_name_list_str, NULL);
if (list) {
strlist__for_each_entry(pos, list)
- if (build_id_cache__purge_path(pos->s)) {
+ if (build_id_cache__purge_path(pos->s, nsi)) {
if (errno == ENOENT) {
pr_debug("%s wasn't in the cache\n",
pos->s);
@@ -405,7 +426,7 @@ int cmd_buildid_cache(int argc, const char **argv)
list = strlist__new(update_name_list_str, NULL);
if (list) {
strlist__for_each_entry(pos, list)
- if (build_id_cache__update_file(pos->s)) {
+ if (build_id_cache__update_file(pos->s, nsi)) {
if (errno == ENOENT) {
pr_debug("%s wasn't in the cache\n",
pos->s);
@@ -424,6 +445,7 @@ int cmd_buildid_cache(int argc, const char **argv)

out:
perf_session__delete(session);
+ nsinfo__zput(nsi);

return ret;
}
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 3fb98d5..c006592 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -416,7 +416,7 @@ static int del_perf_probe_caches(struct strfilter *filter)
}

strlist__for_each_entry(nd, bidlist) {
- cache = probe_cache__new(nd->s);
+ cache = probe_cache__new(nd->s, NULL);
if (!cache)
continue;
if (probe_cache__filter_purge(cache, filter) < 0 ||
diff --git a/tools/perf/tests/sdt.c b/tools/perf/tests/sdt.c
index 06eda67..5abe8ce 100644
--- a/tools/perf/tests/sdt.c
+++ b/tools/perf/tests/sdt.c
@@ -33,7 +33,7 @@ static int build_id_cache__add_file(const char *filename)
}

build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
- err = build_id_cache__add_s(sbuild_id, filename, false, false);
+ err = build_id_cache__add_s(sbuild_id, filename, NULL, false, false);
if (err < 0)
pr_debug("Failed to add build id cache of %s\n", filename);
return err;
@@ -54,7 +54,7 @@ static char *get_self_path(void)
static int search_cached_probe(const char *target,
const char *group, const char *event)
{
- struct probe_cache *cache = probe_cache__new(target);
+ struct probe_cache *cache = probe_cache__new(target, NULL);
int ret = 0;

if (!cache) {
diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index e0148b0..f7bfd90 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -534,13 +534,14 @@ char *build_id_cache__complement(const char *incomplete_sbuild_id)
}

char *build_id_cache__cachedir(const char *sbuild_id, const char *name,
- bool is_kallsyms, bool is_vdso)
+ struct nsinfo *nsi, bool is_kallsyms,
+ bool is_vdso)
{
char *realname = (char *)name, *filename;
bool slash = is_kallsyms || is_vdso;

if (!slash) {
- realname = realpath(name, NULL);
+ realname = nsinfo__realpath(name, nsi);
if (!realname)
return NULL;
}
@@ -556,13 +557,13 @@ char *build_id_cache__cachedir(const char *sbuild_id, const char *name,
return filename;
}

-int build_id_cache__list_build_ids(const char *pathname,
+int build_id_cache__list_build_ids(const char *pathname, struct nsinfo *nsi,
struct strlist **result)
{
char *dir_name;
int ret = 0;

- dir_name = build_id_cache__cachedir(NULL, pathname, false, false);
+ dir_name = build_id_cache__cachedir(NULL, pathname, nsi, false, false);
if (!dir_name)
return -ENOMEM;

@@ -576,16 +577,20 @@ int build_id_cache__list_build_ids(const char *pathname,

#if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT)
static int build_id_cache__add_sdt_cache(const char *sbuild_id,
- const char *realname)
+ const char *realname,
+ struct nsinfo *nsi)
{
struct probe_cache *cache;
int ret;
+ struct nscookie nsc;

- cache = probe_cache__new(sbuild_id);
+ cache = probe_cache__new(sbuild_id, nsi);
if (!cache)
return -1;

+ nsinfo__mountns_enter(nsi, &nsc);
ret = probe_cache__scan_sdt(cache, realname);
+ nsinfo__mountns_exit(&nsc);
if (ret >= 0) {
pr_debug4("Found %d SDTs in %s\n", ret, realname);
if (probe_cache__commit(cache) < 0)
@@ -595,11 +600,11 @@ static int build_id_cache__add_sdt_cache(const char *sbuild_id,
return ret;
}
#else
-#define build_id_cache__add_sdt_cache(sbuild_id, realname) (0)
+#define build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) (0)
#endif

int build_id_cache__add_s(const char *sbuild_id, const char *name,
- bool is_kallsyms, bool is_vdso)
+ struct nsinfo *nsi, bool is_kallsyms, bool is_vdso)
{
const size_t size = PATH_MAX;
char *realname = NULL, *filename = NULL, *dir_name = NULL,
@@ -607,13 +612,16 @@ int build_id_cache__add_s(const char *sbuild_id, const char *name,
int err = -1;

if (!is_kallsyms) {
- realname = realpath(name, NULL);
+ if (!is_vdso)
+ realname = nsinfo__realpath(name, nsi);
+ else
+ realname = realpath(name, NULL);
if (!realname)
goto out_free;
}

- dir_name = build_id_cache__cachedir(sbuild_id, name,
- is_kallsyms, is_vdso);
+ dir_name = build_id_cache__cachedir(sbuild_id, name, nsi, is_kallsyms,
+ is_vdso);
if (!dir_name)
goto out_free;

@@ -634,7 +642,10 @@ int build_id_cache__add_s(const char *sbuild_id, const char *name,

if (access(filename, F_OK)) {
if (is_kallsyms) {
- if (copyfile("/proc/kallsyms", filename))
+ if (copyfile("/proc/kallsyms", filename))
+ goto out_free;
+ } else if (nsi && nsi->need_setns) {
+ if (copyfile_ns(name, filename, nsi))
goto out_free;
} else if (link(realname, filename) && errno != EEXIST &&
copyfile(name, filename))
@@ -657,7 +668,8 @@ int build_id_cache__add_s(const char *sbuild_id, const char *name,
err = 0;

/* Update SDT cache : error is just warned */
- if (realname && build_id_cache__add_sdt_cache(sbuild_id, realname) < 0)
+ if (realname &&
+ build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) < 0)
pr_debug4("Failed to update/scan SDT cache for %s\n", realname);

out_free:
@@ -670,14 +682,15 @@ out_free:
}

static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
- const char *name, bool is_kallsyms,
- bool is_vdso)
+ const char *name, struct nsinfo *nsi,
+ bool is_kallsyms, bool is_vdso)
{
char sbuild_id[SBUILD_ID_SIZE];

build_id__sprintf(build_id, build_id_size, sbuild_id);

- return build_id_cache__add_s(sbuild_id, name, is_kallsyms, is_vdso);
+ return build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms,
+ is_vdso);
}

bool build_id_cache__cached(const char *sbuild_id)
@@ -743,7 +756,7 @@ static int dso__cache_build_id(struct dso *dso, struct machine *machine)
name = nm;
}
return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name,
- is_kallsyms, is_vdso);
+ dso->nsinfo, is_kallsyms, is_vdso);
}

static int __dsos__cache_build_ids(struct list_head *head,
diff --git a/tools/perf/util/build-id.h b/tools/perf/util/build-id.h
index 96690a5..2397084 100644
--- a/tools/perf/util/build-id.h
+++ b/tools/perf/util/build-id.h
@@ -5,6 +5,7 @@
#define SBUILD_ID_SIZE (BUILD_ID_SIZE * 2 + 1)

#include "tool.h"
+#include "namespaces.h"
#include <linux/types.h>

extern struct perf_tool build_id__mark_dso_hit_ops;
@@ -31,17 +32,19 @@ int perf_session__cache_build_ids(struct perf_session *session);
char *build_id_cache__origname(const char *sbuild_id);
char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size);
char *build_id_cache__cachedir(const char *sbuild_id, const char *name,
- bool is_kallsyms, bool is_vdso);
+ struct nsinfo *nsi, bool is_kallsyms,
+ bool is_vdso);

struct strlist;

struct strlist *build_id_cache__list_all(bool validonly);
char *build_id_cache__complement(const char *incomplete_sbuild_id);
-int build_id_cache__list_build_ids(const char *pathname,
+int build_id_cache__list_build_ids(const char *pathname, struct nsinfo *nsi,
struct strlist **result);
bool build_id_cache__cached(const char *sbuild_id);
int build_id_cache__add_s(const char *sbuild_id,
- const char *name, bool is_kallsyms, bool is_vdso);
+ const char *name, struct nsinfo *nsi,
+ bool is_kallsyms, bool is_vdso);
int build_id_cache__remove_s(const char *sbuild_id);

extern char buildid_dir[];
diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index beda40e..dc9b495 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -504,7 +504,14 @@ static void check_data_close(void);
*/
static int open_dso(struct dso *dso, struct machine *machine)
{
- int fd = __open_dso(dso, machine);
+ int fd;
+ struct nscookie nsc;
+
+ if (dso->binary_type != DSO_BINARY_TYPE__BUILD_ID_CACHE)
+ nsinfo__mountns_enter(dso->nsinfo, &nsc);
+ fd = __open_dso(dso, machine);
+ if (dso->binary_type != DSO_BINARY_TYPE__BUILD_ID_CACHE)
+ nsinfo__mountns_exit(&nsc);

if (fd >= 0) {
dso__list_add(dso);
@@ -1302,6 +1309,7 @@ bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
{
bool have_build_id = false;
struct dso *pos;
+ struct nscookie nsc;

list_for_each_entry(pos, head, node) {
if (with_hits && !pos->hit && !dso__is_vdso(pos))
@@ -1310,11 +1318,13 @@ bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
have_build_id = true;
continue;
}
+ nsinfo__mountns_enter(pos->nsinfo, &nsc);
if (filename__read_build_id(pos->long_name, pos->build_id,
sizeof(pos->build_id)) > 0) {
have_build_id = true;
pos->has_build_id = true;
}
+ nsinfo__mountns_exit(&nsc);
}

return have_build_id;
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 01e779b..84e3010 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -2124,7 +2124,7 @@ void print_sdt_events(const char *subsys_glob, const char *event_glob,
return;
}
strlist__for_each_entry(nd, bidlist) {
- pcache = probe_cache__new(nd->s);
+ pcache = probe_cache__new(nd->s, NULL);
if (!pcache)
continue;
list_for_each_entry(ent, &pcache->entries, node) {
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index a80895a..d7cd114 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2769,7 +2769,7 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
if (ret == -EINVAL && pev->uprobes)
warn_uprobe_event_compat(tev);
if (ret == 0 && probe_conf.cache) {
- cache = probe_cache__new(pev->target);
+ cache = probe_cache__new(pev->target, pev->nsi);
if (!cache ||
probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 ||
probe_cache__commit(cache) < 0)
@@ -3119,7 +3119,7 @@ static int find_cached_events(struct perf_probe_event *pev,
int ntevs = 0;
int ret = 0;

- cache = probe_cache__new(target);
+ cache = probe_cache__new(target, pev->nsi);
/* Return 0 ("not found") if the target has no probe cache. */
if (!cache)
return 0;
@@ -3209,7 +3209,7 @@ static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
else
return find_cached_events(pev, tevs, pev->target);
}
- cache = probe_cache__new(pev->target);
+ cache = probe_cache__new(pev->target, pev->nsi);
if (!cache)
return 0;

diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
index d679389..cdf8d83 100644
--- a/tools/perf/util/probe-file.c
+++ b/tools/perf/util/probe-file.c
@@ -412,13 +412,15 @@ int probe_cache_entry__get_event(struct probe_cache_entry *entry,
}

/* For the kernel probe caches, pass target = NULL or DSO__NAME_KALLSYMS */
-static int probe_cache__open(struct probe_cache *pcache, const char *target)
+static int probe_cache__open(struct probe_cache *pcache, const char *target,
+ struct nsinfo *nsi)
{
char cpath[PATH_MAX];
char sbuildid[SBUILD_ID_SIZE];
char *dir_name = NULL;
bool is_kallsyms = false;
int ret, fd;
+ struct nscookie nsc;

if (target && build_id_cache__cached(target)) {
/* This is a cached buildid */
@@ -431,8 +433,11 @@ static int probe_cache__open(struct probe_cache *pcache, const char *target)
target = DSO__NAME_KALLSYMS;
is_kallsyms = true;
ret = sysfs__sprintf_build_id("/", sbuildid);
- } else
+ } else {
+ nsinfo__mountns_enter(nsi, &nsc);
ret = filename__sprintf_build_id(target, sbuildid);
+ nsinfo__mountns_exit(&nsc);
+ }

if (ret < 0) {
pr_debug("Failed to get build-id from %s.\n", target);
@@ -441,7 +446,7 @@ static int probe_cache__open(struct probe_cache *pcache, const char *target)

/* If we have no buildid cache, make it */
if (!build_id_cache__cached(sbuildid)) {
- ret = build_id_cache__add_s(sbuildid, target,
+ ret = build_id_cache__add_s(sbuildid, target, nsi,
is_kallsyms, NULL);
if (ret < 0) {
pr_debug("Failed to add build-id cache: %s\n", target);
@@ -449,7 +454,7 @@ static int probe_cache__open(struct probe_cache *pcache, const char *target)
}
}

- dir_name = build_id_cache__cachedir(sbuildid, target, is_kallsyms,
+ dir_name = build_id_cache__cachedir(sbuildid, target, nsi, is_kallsyms,
false);
found:
if (!dir_name) {
@@ -554,7 +559,7 @@ void probe_cache__delete(struct probe_cache *pcache)
free(pcache);
}

-struct probe_cache *probe_cache__new(const char *target)
+struct probe_cache *probe_cache__new(const char *target, struct nsinfo *nsi)
{
struct probe_cache *pcache = probe_cache__alloc();
int ret;
@@ -562,7 +567,7 @@ struct probe_cache *probe_cache__new(const char *target)
if (!pcache)
return NULL;

- ret = probe_cache__open(pcache, target);
+ ret = probe_cache__open(pcache, target, nsi);
if (ret < 0) {
pr_debug("Cache open error: %d\n", ret);
goto out_err;
@@ -974,7 +979,7 @@ int probe_cache__show_all_caches(struct strfilter *filter)
return -EINVAL;
}
strlist__for_each_entry(nd, bidlist) {
- pcache = probe_cache__new(nd->s);
+ pcache = probe_cache__new(nd->s, NULL);
if (!pcache)
continue;
if (!list_empty(&pcache->entries)) {
diff --git a/tools/perf/util/probe-file.h b/tools/perf/util/probe-file.h
index 5ecc9d3..2ca4163 100644
--- a/tools/perf/util/probe-file.h
+++ b/tools/perf/util/probe-file.h
@@ -51,7 +51,7 @@ int probe_file__del_strlist(int fd, struct strlist *namelist);
int probe_cache_entry__get_event(struct probe_cache_entry *entry,
struct probe_trace_event **tevs);

-struct probe_cache *probe_cache__new(const char *target);
+struct probe_cache *probe_cache__new(const char *target, struct nsinfo *nsi);
int probe_cache__add_entry(struct probe_cache *pcache,
struct perf_probe_event *pev,
struct probe_trace_event *tevs, int ntevs);
@@ -69,7 +69,7 @@ int probe_cache__show_all_caches(struct strfilter *filter);
bool probe_type_is_available(enum probe_type type);
bool kretprobe_offset_is_supported(void);
#else /* ! HAVE_LIBELF_SUPPORT */
-static inline struct probe_cache *probe_cache__new(const char *tgt __maybe_unused)
+static inline struct probe_cache *probe_cache__new(const char *tgt __maybe_unused, struct nsinfo *nsi __maybe_unused)
{
return NULL;
}
diff --git a/tools/perf/util/python-ext-sources b/tools/perf/util/python-ext-sources
index 9f3b0d9..e66dc49 100644
--- a/tools/perf/util/python-ext-sources
+++ b/tools/perf/util/python-ext-sources
@@ -10,6 +10,7 @@ util/ctype.c
util/evlist.c
util/evsel.c
util/cpumap.c
+util/namespaces.c
../lib/bitmap.c
../lib/find_bit.c
../lib/hweight.c
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 21c97cc..8c7bae5 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1464,7 +1464,6 @@ static int dso__find_perf_map(char *filebuf, size_t bufsz,
return rc;
}

-
int dso__load(struct dso *dso, struct map *map)
{
char *name;
@@ -1565,6 +1564,8 @@ int dso__load(struct dso *dso, struct map *map)
for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
struct symsrc *ss = &ss_[ss_pos];
bool next_slot = false;
+ bool is_reg;
+ int sirc;

enum dso_binary_type symtab_type = binary_type_symtab[i];

@@ -1575,12 +1576,20 @@ int dso__load(struct dso *dso, struct map *map)
root_dir, name, PATH_MAX))
continue;

- if (!is_regular_file(name))
- continue;
+ if (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE)
+ nsinfo__mountns_exit(&nsc);
+
+ is_reg = is_regular_file(name);
+ sirc = symsrc__init(ss, dso, name, symtab_type);

- /* Name is now the name of the next image to try */
- if (symsrc__init(ss, dso, name, symtab_type) < 0)
+ if (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE)
+ nsinfo__mountns_enter(dso->nsinfo, &nsc);
+
+ if (!is_reg || sirc < 0) {
+ if (sirc >= 0)
+ symsrc__destroy(ss);
continue;
+ }

if (!syms_ss && symsrc__has_symtab(ss)) {
syms_ss = ss;
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 988111e..9e4ea85 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -143,13 +143,17 @@ out:
return list;
}

-static int slow_copyfile(const char *from, const char *to)
+static int slow_copyfile(const char *from, const char *to, struct nsinfo *nsi)
{
int err = -1;
char *line = NULL;
size_t n;
- FILE *from_fp = fopen(from, "r"), *to_fp;
+ FILE *from_fp, *to_fp;
+ struct nscookie nsc;

+ nsinfo__mountns_enter(nsi, &nsc);
+ from_fp = fopen(from, "r");
+ nsinfo__mountns_exit(&nsc);
if (from_fp == NULL)
goto out;

@@ -198,15 +202,21 @@ int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size)
return size ? -1 : 0;
}

-int copyfile_mode(const char *from, const char *to, mode_t mode)
+static int copyfile_mode_ns(const char *from, const char *to, mode_t mode,
+ struct nsinfo *nsi)
{
int fromfd, tofd;
struct stat st;
- int err = -1;
+ int err;
char *tmp = NULL, *ptr = NULL;
+ struct nscookie nsc;

- if (stat(from, &st))
+ nsinfo__mountns_enter(nsi, &nsc);
+ err = stat(from, &st);
+ nsinfo__mountns_exit(&nsc);
+ if (err)
goto out;
+ err = -1;

/* extra 'x' at the end is to reserve space for '.' */
if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) {
@@ -227,11 +237,13 @@ int copyfile_mode(const char *from, const char *to, mode_t mode)
goto out_close_to;

if (st.st_size == 0) { /* /proc? do it slowly... */
- err = slow_copyfile(from, tmp);
+ err = slow_copyfile(from, tmp, nsi);
goto out_close_to;
}

+ nsinfo__mountns_enter(nsi, &nsc);
fromfd = open(from, O_RDONLY);
+ nsinfo__mountns_exit(&nsc);
if (fromfd < 0)
goto out_close_to;

@@ -248,6 +260,16 @@ out:
return err;
}

+int copyfile_ns(const char *from, const char *to, struct nsinfo *nsi)
+{
+ return copyfile_mode_ns(from, to, 0755, nsi);
+}
+
+int copyfile_mode(const char *from, const char *to, mode_t mode)
+{
+ return copyfile_mode_ns(from, to, mode, NULL);
+}
+
int copyfile(const char *from, const char *to)
{
return copyfile_mode(from, to, 0755);
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 1e5fe1d..062dd20 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -12,6 +12,7 @@
#include <stdarg.h>
#include <linux/compiler.h>
#include <linux/types.h>
+#include "namespaces.h"

/* General helper functions */
void usage(const char *err) __noreturn;
@@ -33,6 +34,7 @@ struct strlist *lsdir(const char *name, bool (*filter)(const char *, struct dire
bool lsdir_no_dot_filter(const char *name, struct dirent *d);
int copyfile(const char *from, const char *to);
int copyfile_mode(const char *from, const char *to, mode_t mode);
+int copyfile_ns(const char *from, const char *to, struct nsinfo *nsi);
int copyfile_offset(int fromfd, loff_t from_ofs, int tofd, loff_t to_ofs, u64 size);

ssize_t readn(int fd, void *buf, size_t n);