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Date: Fri, 26 Sep 2014 11:06:25 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Waiman Long <Waiman.Long@...com>
Cc: Peter Zijlstra <peterz@...radead.org>,
Paul Mackerras <paulus@...ba.org>,
Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
Scott J Norton <scott.norton@...com>,
Douglas Hatch <doug.hatch@...com>,
Don Zickus <dzickus@...hat.com>, Jiri Olsa <jolsa@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH v4 1/2] perf tool: encapsulate dsos list head into struct
dsos
Em Wed, Sep 24, 2014 at 11:45:39AM -0400, Waiman Long escreveu:
> 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()
>
> Because of the need to find out the corresponding dsos structure to
> properly call dsos__add() in dso__load_sym() of util/symbol-elf.c,
> a new dsos field is also added to the dso structure.
Argh, yeah, that is unfortunate that we need to add entries that deep
inside dso__load_syms() :-\
At some point I need to go over that symbols layer, in this case, doing
multiple passes could probably limit dso__load_sym() to act _just_ on
one dso, as it should not be creating any other dso :-\
Anyway, continuing to review, enough ranting :-)
- Arnaldo
> Signed-off-by: Waiman Long <Waiman.Long@...com>
> ---
> tools/perf/util/dso.c | 19 +++++++++++--------
> tools/perf/util/dso.h | 9 ++++++---
> 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 | 2 +-
> 7 files changed, 59 insertions(+), 41 deletions(-)
>
> diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
> index 90d02c6..c2c6134 100644
> --- a/tools/perf/util/dso.c
> +++ b/tools/perf/util/dso.c
> @@ -753,6 +753,7 @@ struct dso *dso__new(const char *name)
> dso->a2l_fails = 1;
> dso->kernel = DSO_TYPE_USER;
> dso->needs_swap = DSO_SWAP__UNSET;
> + dso->dsos = NULL;
> INIT_LIST_HEAD(&dso->node);
> INIT_LIST_HEAD(&dso->data.open_entry);
> }
> @@ -849,35 +850,37 @@ 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);
> + dso->dsos = dsos;
> + 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..cadfef7 100644
> --- a/tools/perf/util/dso.h
> +++ b/tools/perf/util/dso.h
> @@ -90,8 +90,11 @@ struct dso_cache {
> char data[0];
> };
>
> +struct dsos;
> +
> struct dso {
> struct list_head node;
> + struct dsos *dsos;
> struct rb_root symbols[MAP__NR_TYPES];
> struct rb_root symbol_names[MAP__NR_TYPES];
> void *a2l;
> @@ -224,10 +227,10 @@ 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 16bba9f..214b6f7 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);
> @@ -70,11 +70,11 @@ 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);
> }
> @@ -448,23 +448,23 @@ 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,
> @@ -965,7 +965,7 @@ 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 b972824..d8abb6c 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;
> @@ -31,8 +38,8 @@ 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];
> symbol_filter_t symbol_filter;
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index 9a0a183..b153636 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 d753499..cbecc3d 100644
> --- a/tools/perf/util/symbol-elf.c
> +++ b/tools/perf/util/symbol-elf.c
> @@ -916,7 +916,7 @@ 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);
> + dsos__add(dso->dsos, curr_dso);
> dso__set_loaded(curr_dso, map->type);
> } else
> curr_dso = curr_map->dso;
> --
> 1.7.1
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