mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
We'll need to reference count dso->nsinfo, so reduce the number of direct accesses by having a shorter form of obtaining a filename with a chroot (namespace one). Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com> Cc: Dmitriy Vyukov <dvyukov@google.com> Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Riccardo Mancini <rickyman7@gmail.com> Cc: Stephane Eranian <eranian@google.com> Cc: Stephen Brennan <stephen.s.brennan@oracle.com> Link: https://lore.kernel.org/lkml/ZD26ZlqSbgSyH5lX@kernel.org [ Used nsinfo__pid(dso->nsinfo), as it was already present ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
333 lines
8.4 KiB
C
333 lines
8.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include "debug.h"
|
|
#include "dsos.h"
|
|
#include "dso.h"
|
|
#include "util.h"
|
|
#include "vdso.h"
|
|
#include "namespaces.h"
|
|
#include <errno.h>
|
|
#include <libgen.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <symbol.h> // filename__read_build_id
|
|
#include <unistd.h>
|
|
|
|
static int __dso_id__cmp(struct dso_id *a, struct dso_id *b)
|
|
{
|
|
if (a->maj > b->maj) return -1;
|
|
if (a->maj < b->maj) return 1;
|
|
|
|
if (a->min > b->min) return -1;
|
|
if (a->min < b->min) return 1;
|
|
|
|
if (a->ino > b->ino) return -1;
|
|
if (a->ino < b->ino) return 1;
|
|
|
|
/*
|
|
* Synthesized MMAP events have zero ino_generation, avoid comparing
|
|
* them with MMAP events with actual ino_generation.
|
|
*
|
|
* I found it harmful because the mismatch resulted in a new
|
|
* dso that did not have a build ID whereas the original dso did have a
|
|
* build ID. The build ID was essential because the object was not found
|
|
* otherwise. - Adrian
|
|
*/
|
|
if (a->ino_generation && b->ino_generation) {
|
|
if (a->ino_generation > b->ino_generation) return -1;
|
|
if (a->ino_generation < b->ino_generation) return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool dso_id__empty(struct dso_id *id)
|
|
{
|
|
if (!id)
|
|
return true;
|
|
|
|
return !id->maj && !id->min && !id->ino && !id->ino_generation;
|
|
}
|
|
|
|
static void dso__inject_id(struct dso *dso, struct dso_id *id)
|
|
{
|
|
dso->id.maj = id->maj;
|
|
dso->id.min = id->min;
|
|
dso->id.ino = id->ino;
|
|
dso->id.ino_generation = id->ino_generation;
|
|
}
|
|
|
|
static int dso_id__cmp(struct dso_id *a, struct dso_id *b)
|
|
{
|
|
/*
|
|
* The second is always dso->id, so zeroes if not set, assume passing
|
|
* NULL for a means a zeroed id
|
|
*/
|
|
if (dso_id__empty(a) || dso_id__empty(b))
|
|
return 0;
|
|
|
|
return __dso_id__cmp(a, b);
|
|
}
|
|
|
|
int dso__cmp_id(struct dso *a, struct dso *b)
|
|
{
|
|
return __dso_id__cmp(&a->id, &b->id);
|
|
}
|
|
|
|
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))
|
|
continue;
|
|
if (pos->has_build_id) {
|
|
have_build_id = true;
|
|
continue;
|
|
}
|
|
nsinfo__mountns_enter(pos->nsinfo, &nsc);
|
|
if (filename__read_build_id(pos->long_name, &pos->bid) > 0) {
|
|
have_build_id = true;
|
|
pos->has_build_id = true;
|
|
} else if (errno == ENOENT && pos->nsinfo) {
|
|
char *new_name = dso__filename_with_chroot(pos, pos->long_name);
|
|
|
|
if (new_name && filename__read_build_id(new_name,
|
|
&pos->bid) > 0) {
|
|
have_build_id = true;
|
|
pos->has_build_id = true;
|
|
}
|
|
free(new_name);
|
|
}
|
|
nsinfo__mountns_exit(&nsc);
|
|
}
|
|
|
|
return have_build_id;
|
|
}
|
|
|
|
static int __dso__cmp_long_name(const char *long_name, struct dso_id *id, struct dso *b)
|
|
{
|
|
int rc = strcmp(long_name, b->long_name);
|
|
return rc ?: dso_id__cmp(id, &b->id);
|
|
}
|
|
|
|
static int __dso__cmp_short_name(const char *short_name, struct dso_id *id, struct dso *b)
|
|
{
|
|
int rc = strcmp(short_name, b->short_name);
|
|
return rc ?: dso_id__cmp(id, &b->id);
|
|
}
|
|
|
|
static int dso__cmp_short_name(struct dso *a, struct dso *b)
|
|
{
|
|
return __dso__cmp_short_name(a->short_name, &a->id, b);
|
|
}
|
|
|
|
/*
|
|
* Find a matching entry and/or link current entry to RB tree.
|
|
* Either one of the dso or name parameter must be non-NULL or the
|
|
* function will not work.
|
|
*/
|
|
struct dso *__dsos__findnew_link_by_longname_id(struct rb_root *root, struct dso *dso,
|
|
const char *name, struct dso_id *id)
|
|
{
|
|
struct rb_node **p = &root->rb_node;
|
|
struct rb_node *parent = NULL;
|
|
|
|
if (!name)
|
|
name = dso->long_name;
|
|
/*
|
|
* Find node with the matching name
|
|
*/
|
|
while (*p) {
|
|
struct dso *this = rb_entry(*p, struct dso, rb_node);
|
|
int rc = __dso__cmp_long_name(name, id, this);
|
|
|
|
parent = *p;
|
|
if (rc == 0) {
|
|
/*
|
|
* In case the new DSO is a duplicate of an existing
|
|
* one, print a one-time warning & put the new entry
|
|
* at the end of the list of duplicates.
|
|
*/
|
|
if (!dso || (dso == this))
|
|
return this; /* Find matching dso */
|
|
/*
|
|
* The core kernel DSOs may have duplicated long name.
|
|
* In this case, the short name should be different.
|
|
* Comparing the short names to differentiate the DSOs.
|
|
*/
|
|
rc = dso__cmp_short_name(dso, this);
|
|
if (rc == 0) {
|
|
pr_err("Duplicated dso name: %s\n", name);
|
|
return NULL;
|
|
}
|
|
}
|
|
if (rc < 0)
|
|
p = &parent->rb_left;
|
|
else
|
|
p = &parent->rb_right;
|
|
}
|
|
if (dso) {
|
|
/* Add new node and rebalance tree */
|
|
rb_link_node(&dso->rb_node, parent, p);
|
|
rb_insert_color(&dso->rb_node, root);
|
|
dso->root = root;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
void __dsos__add(struct dsos *dsos, struct dso *dso)
|
|
{
|
|
list_add_tail(&dso->node, &dsos->head);
|
|
__dsos__findnew_link_by_longname_id(&dsos->root, dso, NULL, &dso->id);
|
|
/*
|
|
* It is now in the linked list, grab a reference, then garbage collect
|
|
* this when needing memory, by looking at LRU dso instances in the
|
|
* list with atomic_read(&dso->refcnt) == 1, i.e. no references
|
|
* anywhere besides the one for the list, do, under a lock for the
|
|
* list: remove it from the list, then a dso__put(), that probably will
|
|
* be the last and will then call dso__delete(), end of life.
|
|
*
|
|
* That, or at the end of the 'struct machine' lifetime, when all
|
|
* 'struct dso' instances will be removed from the list, in
|
|
* dsos__exit(), if they have no other reference from some other data
|
|
* structure.
|
|
*
|
|
* E.g.: after processing a 'perf.data' file and storing references
|
|
* to objects instantiated while processing events, we will have
|
|
* references to the 'thread', 'map', 'dso' structs all from 'struct
|
|
* hist_entry' instances, but we may not need anything not referenced,
|
|
* so we might as well call machines__exit()/machines__delete() and
|
|
* garbage collect it.
|
|
*/
|
|
dso__get(dso);
|
|
}
|
|
|
|
void dsos__add(struct dsos *dsos, struct dso *dso)
|
|
{
|
|
down_write(&dsos->lock);
|
|
__dsos__add(dsos, dso);
|
|
up_write(&dsos->lock);
|
|
}
|
|
|
|
static struct dso *__dsos__findnew_by_longname_id(struct rb_root *root, const char *name, struct dso_id *id)
|
|
{
|
|
return __dsos__findnew_link_by_longname_id(root, NULL, name, id);
|
|
}
|
|
|
|
static struct dso *__dsos__find_id(struct dsos *dsos, const char *name, struct dso_id *id, bool cmp_short)
|
|
{
|
|
struct dso *pos;
|
|
|
|
if (cmp_short) {
|
|
list_for_each_entry(pos, &dsos->head, node)
|
|
if (__dso__cmp_short_name(name, id, pos) == 0)
|
|
return pos;
|
|
return NULL;
|
|
}
|
|
return __dsos__findnew_by_longname_id(&dsos->root, name, id);
|
|
}
|
|
|
|
struct dso *__dsos__find(struct dsos *dsos, const char *name, bool cmp_short)
|
|
{
|
|
return __dsos__find_id(dsos, name, NULL, cmp_short);
|
|
}
|
|
|
|
static void dso__set_basename(struct dso *dso)
|
|
{
|
|
char *base, *lname;
|
|
int tid;
|
|
|
|
if (sscanf(dso->long_name, "/tmp/perf-%d.map", &tid) == 1) {
|
|
if (asprintf(&base, "[JIT] tid %d", tid) < 0)
|
|
return;
|
|
} else {
|
|
/*
|
|
* basename() may modify path buffer, so we must pass
|
|
* a copy.
|
|
*/
|
|
lname = strdup(dso->long_name);
|
|
if (!lname)
|
|
return;
|
|
|
|
/*
|
|
* basename() may return a pointer to internal
|
|
* storage which is reused in subsequent calls
|
|
* so copy the result.
|
|
*/
|
|
base = strdup(basename(lname));
|
|
|
|
free(lname);
|
|
|
|
if (!base)
|
|
return;
|
|
}
|
|
dso__set_short_name(dso, base, true);
|
|
}
|
|
|
|
static struct dso *__dsos__addnew_id(struct dsos *dsos, const char *name, struct dso_id *id)
|
|
{
|
|
struct dso *dso = dso__new_id(name, id);
|
|
|
|
if (dso != NULL) {
|
|
__dsos__add(dsos, dso);
|
|
dso__set_basename(dso);
|
|
/* Put dso here because __dsos_add already got it */
|
|
dso__put(dso);
|
|
}
|
|
return dso;
|
|
}
|
|
|
|
struct dso *__dsos__addnew(struct dsos *dsos, const char *name)
|
|
{
|
|
return __dsos__addnew_id(dsos, name, NULL);
|
|
}
|
|
|
|
static struct dso *__dsos__findnew_id(struct dsos *dsos, const char *name, struct dso_id *id)
|
|
{
|
|
struct dso *dso = __dsos__find_id(dsos, name, id, false);
|
|
|
|
if (dso && dso_id__empty(&dso->id) && !dso_id__empty(id))
|
|
dso__inject_id(dso, id);
|
|
|
|
return dso ? dso : __dsos__addnew_id(dsos, name, id);
|
|
}
|
|
|
|
struct dso *dsos__findnew_id(struct dsos *dsos, const char *name, struct dso_id *id)
|
|
{
|
|
struct dso *dso;
|
|
down_write(&dsos->lock);
|
|
dso = dso__get(__dsos__findnew_id(dsos, name, id));
|
|
up_write(&dsos->lock);
|
|
return dso;
|
|
}
|
|
|
|
size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
|
|
bool (skip)(struct dso *dso, int parm), int parm)
|
|
{
|
|
struct dso *pos;
|
|
size_t ret = 0;
|
|
|
|
list_for_each_entry(pos, head, node) {
|
|
char sbuild_id[SBUILD_ID_SIZE];
|
|
|
|
if (skip && skip(pos, parm))
|
|
continue;
|
|
build_id__sprintf(&pos->bid, sbuild_id);
|
|
ret += fprintf(fp, "%-40s %s\n", sbuild_id, pos->long_name);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
size_t __dsos__fprintf(struct list_head *head, FILE *fp)
|
|
{
|
|
struct dso *pos;
|
|
size_t ret = 0;
|
|
|
|
list_for_each_entry(pos, head, node) {
|
|
ret += dso__fprintf(pos, fp);
|
|
}
|
|
|
|
return ret;
|
|
}
|