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perf buildid-cache: Add guestmount'd files to the build ID cache

Browse source 
When the guestmount option is used, a guest machine's file system mount
point is recorded in machine->root_dir.

perf already iterates guest machines when adding files to the build ID
cache, but does not take machine->root_dir into account.

Use machine->root_dir to find files for guest build IDs, and add them to
the build ID cache using the "proper" name i.e. relative to the guest root
directory not the host root directory.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: kvm@vger.kernel.org
Link: https://lore.kernel.org/r/20220711093218.10967-9-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2022-07-11 12:31:51 +03:00 committed by Arnaldo Carvalho de Melo
parent 57190e38b0
commit 15fe03621d
2 changed files with 64 additions and 21 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

69
tools/perf/util/build-id.c
View file

@ -625,9 +625,12 @@ static int build_id_cache__add_sdt_cache(const char *sbuild_id,
#endif
static char *build_id_cache__find_debug(const char *sbuild_id,
struct nsinfo *nsi)
struct nsinfo *nsi,
const char *root_dir)
{
const char *dirname = "/usr/lib/debug/.build-id/";
char *realname = NULL;
char dirbuf[PATH_MAX];
char *debugfile;
struct nscookie nsc;
size_t len = 0;
@ -636,8 +639,12 @@ static char *build_id_cache__find_debug(const char *sbuild_id,
if (!debugfile)
goto out;
len = __symbol__join_symfs(debugfile, PATH_MAX,
"/usr/lib/debug/.build-id/");
if (root_dir) {
path__join(dirbuf, PATH_MAX, root_dir, dirname);
dirname = dirbuf;
}
len = __symbol__join_symfs(debugfile, PATH_MAX, dirname);
snprintf(debugfile + len, PATH_MAX - len, "%.2s/%s.debug", sbuild_id,
sbuild_id + 2);
@ -668,14 +675,18 @@ static char *build_id_cache__find_debug(const char *sbuild_id,
int
build_id_cache__add(const char *sbuild_id, const char *name, const char *realname,
struct nsinfo *nsi, bool is_kallsyms, bool is_vdso)
struct nsinfo *nsi, bool is_kallsyms, bool is_vdso,
const char *proper_name, const char *root_dir)
{
const size_t size = PATH_MAX;
char *filename = NULL, *dir_name = NULL, *linkname = zalloc(size), *tmp;
char *debugfile = NULL;
int err = -1;
dir_name = build_id_cache__cachedir(sbuild_id, name, nsi, is_kallsyms,
if (!proper_name)
proper_name = name;
dir_name = build_id_cache__cachedir(sbuild_id, proper_name, nsi, is_kallsyms,
is_vdso);
if (!dir_name)
goto out_free;
@ -715,7 +726,7 @@ build_id_cache__add(const char *sbuild_id, const char *name, const char *realnam
*/
if (!is_kallsyms && !is_vdso &&
strncmp(".ko", name + strlen(name) - 3, 3)) {
debugfile = build_id_cache__find_debug(sbuild_id, nsi);
debugfile = build_id_cache__find_debug(sbuild_id, nsi, root_dir);
if (debugfile) {
zfree(&filename);
if (asprintf(&filename, "%s/%s", dir_name,
@ -781,8 +792,9 @@ build_id_cache__add(const char *sbuild_id, const char *name, const char *realnam
return err;
}
int build_id_cache__add_s(const char *sbuild_id, const char *name,
struct nsinfo *nsi, bool is_kallsyms, bool is_vdso)
int __build_id_cache__add_s(const char *sbuild_id, const char *name,
struct nsinfo *nsi, bool is_kallsyms, bool is_vdso,
const char *proper_name, const char *root_dir)
{
char *realname = NULL;
int err = -1;
@ -796,8 +808,8 @@ int build_id_cache__add_s(const char *sbuild_id, const char *name,
goto out_free;
}
err = build_id_cache__add(sbuild_id, name, realname, nsi, is_kallsyms, is_vdso);
err = build_id_cache__add(sbuild_id, name, realname, nsi,
is_kallsyms, is_vdso, proper_name, root_dir);
out_free:
if (!is_kallsyms)
free(realname);
@ -806,14 +818,16 @@ int build_id_cache__add_s(const char *sbuild_id, const char *name,
static int build_id_cache__add_b(const struct build_id *bid,
const char *name, struct nsinfo *nsi,
bool is_kallsyms, bool is_vdso)
bool is_kallsyms, bool is_vdso,
const char *proper_name,
const char *root_dir)
{
char sbuild_id[SBUILD_ID_SIZE];
build_id__sprintf(bid, sbuild_id);
return build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms,
is_vdso);
return __build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms,
is_vdso, proper_name, root_dir);
}
bool build_id_cache__cached(const char *sbuild_id)
@ -896,6 +910,10 @@ static int dso__cache_build_id(struct dso *dso, struct machine *machine,
bool is_kallsyms = dso__is_kallsyms(dso);
bool is_vdso = dso__is_vdso(dso);
const char *name = dso->long_name;
const char *proper_name = NULL;
const char *root_dir = NULL;
char *allocated_name = NULL;
int ret = 0;
if (!dso->has_build_id)
return 0;
@ -905,11 +923,28 @@ static int dso__cache_build_id(struct dso *dso, struct machine *machine,
name = machine->mmap_name;
}
if (!is_kallsyms && dso__build_id_mismatch(dso, name))
return 0;
if (!machine__is_host(machine)) {
if (*machine->root_dir) {
root_dir = machine->root_dir;
ret = asprintf(&allocated_name, "%s/%s", root_dir, name);
if (ret < 0)
return ret;
proper_name = name;
name = allocated_name;
} else if (is_kallsyms) {
/* Cannot get guest kallsyms */
return 0;
}
}
return build_id_cache__add_b(&dso->bid, name, dso->nsinfo,
is_kallsyms, is_vdso);
if (!is_kallsyms && dso__build_id_mismatch(dso, name))
goto out_free;
ret = build_id_cache__add_b(&dso->bid, name, dso->nsinfo,
is_kallsyms, is_vdso, proper_name, root_dir);
out_free:
free(allocated_name);
return ret;
}
static int

16
tools/perf/util/build-id.h
View file

@ -66,10 +66,18 @@ 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(const char *sbuild_id, const char *name, const char *realname,
struct nsinfo *nsi, bool is_kallsyms, bool is_vdso);
int build_id_cache__add_s(const char *sbuild_id,
const char *name, struct nsinfo *nsi,
bool is_kallsyms, bool is_vdso);
struct nsinfo *nsi, bool is_kallsyms, bool is_vdso,
const char *proper_name, const char *root_dir);
int __build_id_cache__add_s(const char *sbuild_id,
const char *name, struct nsinfo *nsi,
bool is_kallsyms, bool is_vdso,
const char *proper_name, const char *root_dir);
static inline int build_id_cache__add_s(const char *sbuild_id,
const char *name, struct nsinfo *nsi,
bool is_kallsyms, bool is_vdso)
{
return __build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms, is_vdso, NULL, NULL);
}
int build_id_cache__remove_s(const char *sbuild_id);
extern char buildid_dir[];