perf symbols: Encapsulate dsos list head into struct dsos

This is a precursor patch to enable long name searching of DSOs using
a 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>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Douglas Hatch <doug.hatch@hp.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Scott J Norton <scott.norton@hp.com>
Link: http://lkml.kernel.org/r/1412021249-19201-2-git-send-email-Waiman.Long@hp.com
[ Move struct dsos to dso.h to reduce the dso methods depends on machine.h ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

7 files changed, 60 insertions, 41 deletions

diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index 55e39dc1bcda..901a58fa3f22 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 5e463c0964d4..b63dc98ad71d 100644
--- a/tools/perf/util/dso.h
+++ b/tools/perf/util/dso.h
@@ -90,6 +90,13 @@ struct dso_cache {
         char data[0];
 };
 
+/*
+ * DSOs are put into a list for fast iteration.
+ */
+struct dsos {
+        struct list_head head;
+};
+
 struct dso {
         struct list_head node;
         struct rb_root   symbols[MAP__NR_TYPES];
@@ -224,10 +231,10 @@ 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 158c787ce0c4..ce0de00399da 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 b2ec38bf211e..49a75ec4c47b 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 6a6bcc1cff54..2b651a7f5d0d 100644
--- a/tools/perf/util/machine.h
+++ b/tools/perf/util/machine.h
@@ -4,6 +4,7 @@
 #include <sys/types.h>
 #include <linux/rbtree.h>
 #include "map.h"
+#include "dso.h"
 #include "event.h"
 
 struct addr_location;
@@ -32,8 +33,8 @@ 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 be37b5aca335..c150ca4343eb 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 2a92e10317c5..1e23a5bfb044 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;