[PATCH v5 1/2] perf tool: encapsulate dsos list head into struct dsos

Waiman Long
2014-09-29T20:07:44Z

This is a precursor patch to enable long name searching of DSOs
using the rbtree. In this patch, a new dsos structure is created
which contains only a list head structure for the moment. The new
dsos structure is used, in turn, in the machine structure for the
user_dsos and kernel_dsos fields. Only the following 3 dsos functions
are modified to accept the new dsos structure parameter instead
of list_head:
- dsos__add()
- dsos__find()
- __dsos__findnew()

Signed-off-by: Waiman Long <Waiman.Long@hp.com>
---
tools/perf/util/dso.c | 17 +++++++++--------
tools/perf/util/dso.h | 8 +++++---
tools/perf/util/header.c | 32 ++++++++++++++++++--------------
tools/perf/util/machine.c | 24 ++++++++++++------------
tools/perf/util/machine.h | 11 +++++++++--
tools/perf/util/probe-event.c | 3 ++-
tools/perf/util/symbol-elf.c | 7 ++++++-
7 files changed, 61 insertions(+), 41 deletions(-)

diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index 55e39dc..901a58f 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -851,35 +851,36 @@ bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
return have_build_id;
}

-void dsos__add(struct list_head *head, struct dso *dso)
+void dsos__add(struct dsos *dsos, struct dso *dso)
{
- list_add_tail(&dso->node, head);
+ list_add_tail(&dso->node, &dsos->head);
}

-struct dso *dsos__find(const struct list_head *head, const char *name, bool cmp_short)
+struct dso *dsos__find(const struct dsos *dsos, const char *name,
+ bool cmp_short)
{
struct dso *pos;

if (cmp_short) {
- list_for_each_entry(pos, head, node)
+ list_for_each_entry(pos, &dsos->head, node)
if (strcmp(pos->short_name, name) == 0)
return pos;
return NULL;
}
- list_for_each_entry(pos, head, node)
+ list_for_each_entry(pos, &dsos->head, node)
if (strcmp(pos->long_name, name) == 0)
return pos;
return NULL;
}

-struct dso *__dsos__findnew(struct list_head *head, const char *name)
+struct dso *__dsos__findnew(struct dsos *dsos, const char *name)
{
- struct dso *dso = dsos__find(head, name, false);
+ struct dso *dso = dsos__find(dsos, name, false);

if (!dso) {
dso = dso__new(name);
if (dso != NULL) {
- dsos__add(head, dso);
+ dsos__add(dsos, dso);
dso__set_basename(dso);
}
}
diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h
index 5e463c0..91eec17 100644
--- a/tools/perf/util/dso.h
+++ b/tools/perf/util/dso.h
@@ -90,6 +90,8 @@ struct dso_cache {
char data[0];
};

+struct dsos;
+
struct dso {
struct list_head node;
struct rb_root symbols[MAP__NR_TYPES];
@@ -224,10 +226,10 @@ struct map *dso__new_map(const char *name);
struct dso *dso__kernel_findnew(struct machine *machine, const char *name,
const char *short_name, int dso_type);

-void dsos__add(struct list_head *head, struct dso *dso);
-struct dso *dsos__find(const struct list_head *head, const char *name,
+void dsos__add(struct dsos *dsos, struct dso *dso);
+struct dso *dsos__find(const struct dsos *dsos, const char *name,
bool cmp_short);
-struct dso *__dsos__findnew(struct list_head *head, const char *name);
+struct dso *__dsos__findnew(struct dsos *dsos, const char *name);
bool __dsos__read_build_ids(struct list_head *head, bool with_hits);

size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 158c787..ce0de00 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -214,11 +214,11 @@ static int machine__hit_all_dsos(struct machine *machine)
{
int err;

- err = __dsos__hit_all(&machine->kernel_dsos);
+ err = __dsos__hit_all(&machine->kernel_dsos.head);
if (err)
return err;

- return __dsos__hit_all(&machine->user_dsos);
+ return __dsos__hit_all(&machine->user_dsos.head);
}

int dsos__hit_all(struct perf_session *session)
@@ -288,11 +288,12 @@ static int machine__write_buildid_table(struct machine *machine, int fd)
umisc = PERF_RECORD_MISC_GUEST_USER;
}

- err = __dsos__write_buildid_table(&machine->kernel_dsos, machine,
+ err = __dsos__write_buildid_table(&machine->kernel_dsos.head, machine,
machine->pid, kmisc, fd);
if (err == 0)
- err = __dsos__write_buildid_table(&machine->user_dsos, machine,
- machine->pid, umisc, fd);
+ err = __dsos__write_buildid_table(&machine->user_dsos.head,
+ machine, machine->pid, umisc,
+ fd);
return err;
}

@@ -455,9 +456,10 @@ static int __dsos__cache_build_ids(struct list_head *head,

static int machine__cache_build_ids(struct machine *machine, const char *debugdir)
{
- int ret = __dsos__cache_build_ids(&machine->kernel_dsos, machine,
+ int ret = __dsos__cache_build_ids(&machine->kernel_dsos.head, machine,
debugdir);
- ret |= __dsos__cache_build_ids(&machine->user_dsos, machine, debugdir);
+ ret |= __dsos__cache_build_ids(&machine->user_dsos.head, machine,
+ debugdir);
return ret;
}

@@ -483,8 +485,10 @@ static int perf_session__cache_build_ids(struct perf_session *session)

static bool machine__read_build_ids(struct machine *machine, bool with_hits)
{
- bool ret = __dsos__read_build_ids(&machine->kernel_dsos, with_hits);
- ret |= __dsos__read_build_ids(&machine->user_dsos, with_hits);
+ bool ret;
+
+ ret = __dsos__read_build_ids(&machine->kernel_dsos.head, with_hits);
+ ret |= __dsos__read_build_ids(&machine->user_dsos.head, with_hits);
return ret;
}

@@ -1548,7 +1552,7 @@ static int __event_process_build_id(struct build_id_event *bev,
struct perf_session *session)
{
int err = -1;
- struct list_head *head;
+ struct dsos *dsos;
struct machine *machine;
u16 misc;
struct dso *dso;
@@ -1563,22 +1567,22 @@ static int __event_process_build_id(struct build_id_event *bev,
switch (misc) {
case PERF_RECORD_MISC_KERNEL:
dso_type = DSO_TYPE_KERNEL;
- head = &machine->kernel_dsos;
+ dsos = &machine->kernel_dsos;
break;
case PERF_RECORD_MISC_GUEST_KERNEL:
dso_type = DSO_TYPE_GUEST_KERNEL;
- head = &machine->kernel_dsos;
+ dsos = &machine->kernel_dsos;
break;
case PERF_RECORD_MISC_USER:
case PERF_RECORD_MISC_GUEST_USER:
dso_type = DSO_TYPE_USER;
- head = &machine->user_dsos;
+ dsos = &machine->user_dsos;
break;
default:
goto out;
}

- dso = __dsos__findnew(head, filename);
+ dso = __dsos__findnew(dsos, filename);
if (dso != NULL) {
char sbuild_id[BUILD_ID_SIZE * 2 + 1];

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index b2ec38b..49a75ec 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -17,8 +17,8 @@ int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
{
map_groups__init(&machine->kmaps);
RB_CLEAR_NODE(&machine->rb_node);
- INIT_LIST_HEAD(&machine->user_dsos);
- INIT_LIST_HEAD(&machine->kernel_dsos);
+ INIT_LIST_HEAD(&machine->user_dsos.head);
+ INIT_LIST_HEAD(&machine->kernel_dsos.head);

machine->threads = RB_ROOT;
INIT_LIST_HEAD(&machine->dead_threads);
@@ -72,11 +72,11 @@ out_delete:
return NULL;
}

-static void dsos__delete(struct list_head *dsos)
+static void dsos__delete(struct dsos *dsos)
{
struct dso *pos, *n;

- list_for_each_entry_safe(pos, n, dsos, node) {
+ list_for_each_entry_safe(pos, n, &dsos->head, node) {
list_del(&pos->node);
dso__delete(pos);
}
@@ -477,23 +477,23 @@ struct map *machine__new_module(struct machine *machine, u64 start,
size_t machines__fprintf_dsos(struct machines *machines, FILE *fp)
{
struct rb_node *nd;
- size_t ret = __dsos__fprintf(&machines->host.kernel_dsos, fp) +
- __dsos__fprintf(&machines->host.user_dsos, fp);
+ size_t ret = __dsos__fprintf(&machines->host.kernel_dsos.head, fp) +
+ __dsos__fprintf(&machines->host.user_dsos.head, fp);

for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
struct machine *pos = rb_entry(nd, struct machine, rb_node);
- ret += __dsos__fprintf(&pos->kernel_dsos, fp);
- ret += __dsos__fprintf(&pos->user_dsos, fp);
+ ret += __dsos__fprintf(&pos->kernel_dsos.head, fp);
+ ret += __dsos__fprintf(&pos->user_dsos.head, fp);
}

return ret;
}

-size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp,
+size_t machine__fprintf_dsos_buildid(struct machine *m, FILE *fp,
bool (skip)(struct dso *dso, int parm), int parm)
{
- return __dsos__fprintf_buildid(&machine->kernel_dsos, fp, skip, parm) +
- __dsos__fprintf_buildid(&machine->user_dsos, fp, skip, parm);
+ return __dsos__fprintf_buildid(&m->kernel_dsos.head, fp, skip, parm) +
+ __dsos__fprintf_buildid(&m->user_dsos.head, fp, skip, parm);
}

size_t machines__fprintf_dsos_buildid(struct machines *machines, FILE *fp,
@@ -994,7 +994,7 @@ static bool machine__uses_kcore(struct machine *machine)
{
struct dso *dso;

- list_for_each_entry(dso, &machine->kernel_dsos, node) {
+ list_for_each_entry(dso, &machine->kernel_dsos.head, node) {
if (dso__is_kcore(dso))
return true;
}
diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
index 6a6bcc1..37b3487 100644
--- a/tools/perf/util/machine.h
+++ b/tools/perf/util/machine.h
@@ -22,6 +22,13 @@ extern const char *ref_reloc_sym_names[];

struct vdso_info;

+/*
+ * DSOs are put into a list for fast iteration.
+ */
+struct dsos {
+ struct list_head head;
+};
+
struct machine {
struct rb_node rb_node;
pid_t pid;
@@ -32,8 +39,8 @@ struct machine {
struct list_head dead_threads;
struct thread *last_match;
struct vdso_info *vdso_info;
- struct list_head user_dsos;
- struct list_head kernel_dsos;
+ struct dsos user_dsos;
+ struct dsos kernel_dsos;
struct map_groups kmaps;
struct map *vmlinux_maps[MAP__NR_TYPES];
u64 kernel_start;
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index be37b5a..c150ca4 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -184,7 +184,8 @@ static struct dso *kernel_get_module_dso(const char *module)
const char *vmlinux_name;

if (module) {
- list_for_each_entry(dso, &host_machine->kernel_dsos, node) {
+ list_for_each_entry(dso, &host_machine->kernel_dsos.head,
+ node) {
if (strncmp(dso->short_name + 1, module,
dso->short_name_len - 2) == 0)
goto found;
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 2a92e10..1e23a5b 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -6,6 +6,7 @@
#include <inttypes.h>

#include "symbol.h"
+#include "machine.h"
#include "vdso.h"
#include <symbol/kallsyms.h>
#include "debug.h"
@@ -929,7 +930,11 @@ int dso__load_sym(struct dso *dso, struct map *map,
}
curr_dso->symtab_type = dso->symtab_type;
map_groups__insert(kmap->kmaps, curr_map);
- dsos__add(&dso->node, curr_dso);
+ /*
+ * The new DSO should go to the kernel DSOS
+ */
+ dsos__add(&map->groups->machine->kernel_dsos,
+ curr_dso);
dso__set_loaded(curr_dso, map->type);
} else
curr_dso = curr_map->dso;
--
1.7.1