Merge branch 'sh/kfr2r09'

20 files changed, 616 insertions, 167 deletions

diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index 8aa3f8c88707..e72e93110782 100644
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -24,6 +24,9 @@ OPTIONS
 --dsos=::
         Only consider symbols in these dsos. CSV that understands
         file://filename entries.
+-n
+--show-nr-samples
+        Show the number of samples for each symbol
 -C::
 --comms=::
         Only consider symbols in these comms. CSV that understands
@@ -33,6 +36,18 @@ OPTIONS
         Only consider these symbols. CSV that understands
         file://filename entries.
 
+-w::
+--field-width=::
+        Force each column width to the provided list, for large terminal
+        readability.
+
+-t::
+--field-separator=::
+
+        Use a special separator character and don't pad with spaces, replacing
+        all occurances of this separator in symbol names (and other output)
+        with a '.' character, that thus it's the only non valid separator.
+
 SEE ALSO
 --------
 linkperf:perf-stat[1]
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 7822b3d6baca..a5e9b876ca09 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -345,7 +345,7 @@ BUILTIN_OBJS += builtin-stat.o
 BUILTIN_OBJS += builtin-top.o
 
 PERFLIBS = $(LIB_FILE)
-EXTLIBS =
+EXTLIBS = -lbfd
 
 #
 # Platform specific tweaks
diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
index 5f9eefecc574..1dba568e1941 100644
--- a/tools/perf/builtin-annotate.c
+++ b/tools/perf/builtin-annotate.c
@@ -74,20 +74,12 @@ struct fork_event {
         u32 pid, ppid;
 };
 
-struct period_event {
-        struct perf_event_header header;
-        u64 time;
-        u64 id;
-        u64 sample_period;
-};
-
 typedef union event_union {
         struct perf_event_header        header;
         struct ip_event                 ip;
         struct mmap_event               mmap;
         struct comm_event               comm;
         struct fork_event               fork;
-        struct period_event             period;
 } event_t;
 
 
@@ -998,19 +990,6 @@ process_fork_event(event_t *event, unsigned long offset, unsigned long head)
 }
 
 static int
-process_period_event(event_t *event, unsigned long offset, unsigned long head)
-{
-        dprintf("%p [%p]: PERF_EVENT_PERIOD: time:%Ld, id:%Ld: period:%Ld\n",
-                (void *)(offset + head),
-                (void *)(long)(event->header.size),
-                event->period.time,
-                event->period.id,
-                event->period.sample_period);
-
-        return 0;
-}
-
-static int
 process_event(event_t *event, unsigned long offset, unsigned long head)
 {
         switch (event->header.type) {
@@ -1025,9 +1004,6 @@ process_event(event_t *event, unsigned long offset, unsigned long head)
 
         case PERF_EVENT_FORK:
                 return process_fork_event(event, offset, head);
-
-        case PERF_EVENT_PERIOD:
-                return process_period_event(event, offset, head);
         /*
          * We dont process them right now but they are fine:
          */
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 4ef78a5e6f32..6da09928130f 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -43,6 +43,7 @@ static int			call_graph			= 0;
 static int                      verbose                         = 0;
 static int                      inherit_stat                    = 0;
 static int                      no_samples                      = 0;
+static int                      sample_address                  = 0;
 
 static long                     samples;
 static struct timeval           last_read;
@@ -313,6 +314,10 @@ static void pid_synthesize_mmap_samples(pid_t pid)
                 if (*pbf == 'x') { /* vm_exec */
                         char *execname = strchr(bf, '/');
 
+                        /* Catch VDSO */
+                        if (execname == NULL)
+                                execname = strstr(bf, "[vdso]");
+
                         if (execname == NULL)
                                 continue;
 
@@ -401,6 +406,9 @@ static void create_counter(int counter, int cpu, pid_t pid)
         if (inherit_stat)
                 attr->inherit_stat = 1;
 
+        if (sample_address)
+                attr->sample_type       |= PERF_SAMPLE_ADDR;
+
         if (call_graph)
                 attr->sample_type       |= PERF_SAMPLE_CALLCHAIN;
 
@@ -645,6 +653,8 @@ static const struct option options[] = {
                     "be more verbose (show counter open errors, etc)"),
         OPT_BOOLEAN('s', "stat", &inherit_stat,
                     "per thread counts"),
+        OPT_BOOLEAN('d', "data", &sample_address,
+                    "Sample addresses"),
         OPT_BOOLEAN('n', "no-samples", &no_samples,
                     "don't sample"),
         OPT_END()
@@ -654,7 +664,8 @@ int cmd_record(int argc, const char **argv, const char *prefix __used)
 {
         int counter;
 
-        argc = parse_options(argc, argv, options, record_usage, 0);
+        argc = parse_options(argc, argv, options, record_usage,
+                PARSE_OPT_STOP_AT_NON_OPTION);
         if (!argc && target_pid == -1 && !system_wide)
                 usage_with_options(record_usage, options);
 
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 4e5cc266311e..b20a4b6e31b7 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -33,8 +33,10 @@ static char		*vmlinux = NULL;
 
 static char             default_sort_order[] = "comm,dso";
 static char             *sort_order = default_sort_order;
-static char             *dso_list_str, *comm_list_str, *sym_list_str;
+static char             *dso_list_str, *comm_list_str, *sym_list_str,
+                        *col_width_list_str;
 static struct strlist   *dso_list, *comm_list, *sym_list;
+static char             *field_sep;
 
 static int              input;
 static int              show_mask = SHOW_KERNEL | SHOW_USER | SHOW_HV;
@@ -49,6 +51,7 @@ static int		verbose;
 static int              modules;
 
 static int              full_paths;
+static int              show_nr_samples;
 
 static unsigned long    page_size;
 static unsigned long    mmap_window = 32;
@@ -98,13 +101,6 @@ struct fork_event {
         u32 pid, ppid;
 };
 
-struct period_event {
-        struct perf_event_header header;
-        u64 time;
-        u64 id;
-        u64 sample_period;
-};
-
 struct lost_event {
         struct perf_event_header header;
         u64 id;
@@ -124,11 +120,37 @@ typedef union event_union {
         struct mmap_event               mmap;
         struct comm_event               comm;
         struct fork_event               fork;
-        struct period_event             period;
         struct lost_event               lost;
         struct read_event               read;
 } event_t;
 
+static int repsep_fprintf(FILE *fp, const char *fmt, ...)
+{
+        int n;
+        va_list ap;
+
+        va_start(ap, fmt);
+        if (!field_sep)
+                n = vfprintf(fp, fmt, ap);
+        else {
+                char *bf = NULL;
+                n = vasprintf(&bf, fmt, ap);
+                if (n > 0) {
+                        char *sep = bf;
+                        while (1) {
+                                sep = strchr(sep, *field_sep);
+                                if (sep == NULL)
+                                        break;
+                                *sep = '.';
+                        }
+                }
+                fputs(bf, fp);
+                free(bf);
+        }
+        va_end(ap);
+        return n;
+}
+
 static LIST_HEAD(dsos);
 static struct dso *kernel_dso;
 static struct dso *vdso;
@@ -360,12 +382,28 @@ static struct thread *thread__new(pid_t pid)
         return self;
 }
 
+static unsigned int dsos__col_width,
+                    comms__col_width,
+                    threads__col_width;
+
 static int thread__set_comm(struct thread *self, const char *comm)
 {
         if (self->comm)
                 free(self->comm);
         self->comm = strdup(comm);
-        return self->comm ? 0 : -ENOMEM;
+        if (!self->comm)
+                return -ENOMEM;
+
+        if (!col_width_list_str && !field_sep &&
+            (!comm_list || strlist__has_entry(comm_list, comm))) {
+                unsigned int slen = strlen(comm);
+                if (slen > comms__col_width) {
+                        comms__col_width = slen;
+                        threads__col_width = slen + 6;
+                }
+        }
+
+        return 0;
 }
 
 static size_t thread__fprintf(struct thread *self, FILE *fp)
@@ -536,7 +574,9 @@ struct sort_entry {
 
         int64_t (*cmp)(struct hist_entry *, struct hist_entry *);
         int64_t (*collapse)(struct hist_entry *, struct hist_entry *);
-        size_t  (*print)(FILE *fp, struct hist_entry *);
+        size_t  (*print)(FILE *fp, struct hist_entry *, unsigned int width);
+        unsigned int *width;
+        bool    elide;
 };
 
 static int64_t cmp_null(void *l, void *r)
@@ -558,15 +598,17 @@ sort__thread_cmp(struct hist_entry *left, struct hist_entry *right)
 }
 
 static size_t
-sort__thread_print(FILE *fp, struct hist_entry *self)
+sort__thread_print(FILE *fp, struct hist_entry *self, unsigned int width)
 {
-        return fprintf(fp, "%16s:%5d", self->thread->comm ?: "", self->thread->pid);
+        return repsep_fprintf(fp, "%*s:%5d", width - 6,
+                              self->thread->comm ?: "", self->thread->pid);
 }
 
 static struct sort_entry sort_thread = {
-        .header = "         Command:  Pid",
+        .header = "Command:  Pid",
         .cmp    = sort__thread_cmp,
         .print  = sort__thread_print,
+        .width  = &threads__col_width,
 };
 
 /* --sort comm */
@@ -590,16 +632,17 @@ sort__comm_collapse(struct hist_entry *left, struct hist_entry *right)
 }
 
 static size_t
-sort__comm_print(FILE *fp, struct hist_entry *self)
+sort__comm_print(FILE *fp, struct hist_entry *self, unsigned int width)
 {
-        return fprintf(fp, "%16s", self->thread->comm);
+        return repsep_fprintf(fp, "%*s", width, self->thread->comm);
 }
 
 static struct sort_entry sort_comm = {
-        .header         = "         Command",
+        .header         = "Command",
         .cmp            = sort__comm_cmp,
         .collapse       = sort__comm_collapse,
         .print          = sort__comm_print,
+        .width          = &comms__col_width,
 };
 
 /* --sort dso */
@@ -617,18 +660,19 @@ sort__dso_cmp(struct hist_entry *left, struct hist_entry *right)
 }
 
 static size_t
-sort__dso_print(FILE *fp, struct hist_entry *self)
+sort__dso_print(FILE *fp, struct hist_entry *self, unsigned int width)
 {
         if (self->dso)
-                return fprintf(fp, "%-25s", self->dso->name);
+                return repsep_fprintf(fp, "%-*s", width, self->dso->name);
 
-        return fprintf(fp, "%016llx         ", (u64)self->ip);
+        return repsep_fprintf(fp, "%*llx", width, (u64)self->ip);
 }
 
 static struct sort_entry sort_dso = {
-        .header = "Shared Object            ",
+        .header = "Shared Object",
         .cmp    = sort__dso_cmp,
         .print  = sort__dso_print,
+        .width  = &dsos__col_width,
 };
 
 /* --sort symbol */
@@ -648,22 +692,22 @@ sort__sym_cmp(struct hist_entry *left, struct hist_entry *right)
 }
 
 static size_t
-sort__sym_print(FILE *fp, struct hist_entry *self)
+sort__sym_print(FILE *fp, struct hist_entry *self, unsigned int width __used)
 {
         size_t ret = 0;
 
         if (verbose)
-                ret += fprintf(fp, "%#018llx  ", (u64)self->ip);
+                ret += repsep_fprintf(fp, "%#018llx  ", (u64)self->ip);
 
+        ret += repsep_fprintf(fp, "[%c] ", self->level);
         if (self->sym) {
-                ret += fprintf(fp, "[%c] %s",
-                        self->dso == kernel_dso ? 'k' :
-                        self->dso == hypervisor_dso ? 'h' : '.', self->sym->name);
+                ret += repsep_fprintf(fp, "%s", self->sym->name);
 
                 if (self->sym->module)
-                        ret += fprintf(fp, "\t[%s]", self->sym->module->name);
+                        ret += repsep_fprintf(fp, "\t[%s]",
+                                             self->sym->module->name);
         } else {
-                ret += fprintf(fp, "%#016llx", (u64)self->ip);
+                ret += repsep_fprintf(fp, "%#016llx", (u64)self->ip);
         }
 
         return ret;
@@ -690,19 +734,19 @@ sort__parent_cmp(struct hist_entry *left, struct hist_entry *right)
 }
 
 static size_t
-sort__parent_print(FILE *fp, struct hist_entry *self)
+sort__parent_print(FILE *fp, struct hist_entry *self, unsigned int width)
 {
-        size_t ret = 0;
-
-        ret += fprintf(fp, "%-20s", self->parent ? self->parent->name : "[other]");
-
-        return ret;
+        return repsep_fprintf(fp, "%-*s", width,
+                              self->parent ? self->parent->name : "[other]");
 }
 
+static unsigned int parent_symbol__col_width;
+
 static struct sort_entry sort_parent = {
-        .header = "Parent symbol       ",
+        .header = "Parent symbol",
         .cmp    = sort__parent_cmp,
         .print  = sort__parent_print,
+        .width  = &parent_symbol__col_width,
 };
 
 static int sort__need_collapse = 0;
@@ -967,17 +1011,25 @@ hist_entry__fprintf(FILE *fp, struct hist_entry *self, u64 total_samples)
                 return 0;
 
         if (total_samples)
-                ret = percent_color_fprintf(fp, "   %6.2f%%",
-                                (self->count * 100.0) / total_samples);
+                ret = percent_color_fprintf(fp,
+                                            field_sep ? "%.2f" : "   %6.2f%%",
+                                        (self->count * 100.0) / total_samples);
         else
-                ret = fprintf(fp, "%12Ld ", self->count);
+                ret = fprintf(fp, field_sep ? "%lld" : "%12lld ", self->count);
+
+        if (show_nr_samples) {
+                if (field_sep)
+                        fprintf(fp, "%c%lld", *field_sep, self->count);
+                else
+                        fprintf(fp, "%11lld", self->count);
+        }
 
         list_for_each_entry(se, &hist_entry__sort_list, list) {
-                if (exclude_other && (se == &sort_parent))
+                if (se->elide)
                         continue;
 
-                fprintf(fp, "  ");
-                ret += se->print(fp, self);
+                fprintf(fp, "%s", field_sep ?: "  ");
+                ret += se->print(fp, self, se->width ? *se->width : 0);
         }
 
         ret += fprintf(fp, "\n");
@@ -992,6 +1044,18 @@ hist_entry__fprintf(FILE *fp, struct hist_entry *self, u64 total_samples)
  *
  */
 
+static void dso__calc_col_width(struct dso *self)
+{
+        if (!col_width_list_str && !field_sep &&
+            (!dso_list || strlist__has_entry(dso_list, self->name))) {
+                unsigned int slen = strlen(self->name);
+                if (slen > dsos__col_width)
+                        dsos__col_width = slen;
+        }
+
+        self->slen_calculated = 1;
+}
+
 static struct symbol *
 resolve_symbol(struct thread *thread, struct map **mapp,
                struct dso **dsop, u64 *ipp)
@@ -1011,6 +1075,14 @@ resolve_symbol(struct thread *thread, struct map **mapp,
 
         map = thread__find_map(thread, ip);
         if (map != NULL) {
+                /*
+                 * We have to do this here as we may have a dso
+                 * with no symbol hit that has a name longer than
+                 * the ones with symbols sampled.
+                 */
+                if (!sort_dso.elide && !map->dso->slen_calculated)
+                        dso__calc_col_width(map->dso);
+
                 if (mapp)
                         *mapp = map;
 got_map:
@@ -1282,35 +1354,67 @@ static size_t output__fprintf(FILE *fp, u64 total_samples)
         struct sort_entry *se;
         struct rb_node *nd;
         size_t ret = 0;
+        unsigned int width;
+        char *col_width = col_width_list_str;
 
-        fprintf(fp, "\n");
-        fprintf(fp, "#\n");
-        fprintf(fp, "# (%Ld samples)\n", (u64)total_samples);
+        fprintf(fp, "# Samples: %Ld\n", (u64)total_samples);
         fprintf(fp, "#\n");
 
         fprintf(fp, "# Overhead");
+        if (show_nr_samples) {
+                if (field_sep)
+                        fprintf(fp, "%cSamples", *field_sep);
+                else
+                        fputs("  Samples  ", fp);
+        }
         list_for_each_entry(se, &hist_entry__sort_list, list) {
-                if (exclude_other && (se == &sort_parent))
+                if (se->elide)
                         continue;
-                fprintf(fp, "  %s", se->header);
+                if (field_sep) {
+                        fprintf(fp, "%c%s", *field_sep, se->header);
+                        continue;
+                }
+                width = strlen(se->header);
+                if (se->width) {
+                        if (col_width_list_str) {
+                                if (col_width) {
+                                        *se->width = atoi(col_width);
+                                        col_width = strchr(col_width, ',');
+                                        if (col_width)
+                                                ++col_width;
+                                }
+                        }
+                        width = *se->width = max(*se->width, width);
+                }
+                fprintf(fp, "  %*s", width, se->header);
         }
         fprintf(fp, "\n");
 
+        if (field_sep)
+                goto print_entries;
+
         fprintf(fp, "# ........");
+        if (show_nr_samples)
+                fprintf(fp, " ..........");
         list_for_each_entry(se, &hist_entry__sort_list, list) {
                 unsigned int i;
 
-                if (exclude_other && (se == &sort_parent))
+                if (se->elide)
                         continue;
 
                 fprintf(fp, "  ");
-                for (i = 0; i < strlen(se->header); i++)
+                if (se->width)
+                        width = *se->width;
+                else
+                        width = strlen(se->header);
+                for (i = 0; i < width; i++)
                         fprintf(fp, ".");
         }
         fprintf(fp, "\n");
 
         fprintf(fp, "#\n");
 
+print_entries:
         for (nd = rb_first(&output_hists); nd; nd = rb_next(nd)) {
                 pos = rb_entry(nd, struct hist_entry, rb_node);
                 ret += hist_entry__fprintf(fp, pos, total_samples);
@@ -1524,19 +1628,6 @@ process_fork_event(event_t *event, unsigned long offset, unsigned long head)
 }
 
 static int
-process_period_event(event_t *event, unsigned long offset, unsigned long head)
-{
-        dprintf("%p [%p]: PERF_EVENT_PERIOD: time:%Ld, id:%Ld: period:%Ld\n",
-                (void *)(offset + head),
-                (void *)(long)(event->header.size),
-                event->period.time,
-                event->period.id,
-                event->period.sample_period);
-
-        return 0;
-}
-
-static int
 process_lost_event(event_t *event, unsigned long offset, unsigned long head)
 {
         dprintf("%p [%p]: PERF_EVENT_LOST: id:%Ld: lost:%Ld\n",
@@ -1617,9 +1708,6 @@ process_event(event_t *event, unsigned long offset, unsigned long head)
         case PERF_EVENT_FORK:
                 return process_fork_event(event, offset, head);
 
-        case PERF_EVENT_PERIOD:
-                return process_period_event(event, offset, head);
-
         case PERF_EVENT_LOST:
                 return process_lost_event(event, offset, head);
 
@@ -1883,6 +1971,8 @@ static const struct option options[] = {
         OPT_STRING('k', "vmlinux", &vmlinux, "file", "vmlinux pathname"),
         OPT_BOOLEAN('m', "modules", &modules,
                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
+        OPT_BOOLEAN('n', "show-nr-samples", &show_nr_samples,
+                    "Show a column with the number of samples"),
         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
                    "sort by key(s): pid, comm, dso, symbol, parent"),
         OPT_BOOLEAN('P', "full-paths", &full_paths,
@@ -1891,15 +1981,21 @@ static const struct option options[] = {
                    "regex filter to identify parent, see: '--sort parent'"),
         OPT_BOOLEAN('x', "exclude-other", &exclude_other,
                     "Only display entries with parent-match"),
-        OPT_CALLBACK_DEFAULT('c', "callchain", NULL, "output_type,min_percent",
+        OPT_CALLBACK_DEFAULT('g', "call-graph", NULL, "output_type,min_percent",
                      "Display callchains using output_type and min percent threshold. "
-                     "Default: flat,0", &parse_callchain_opt, callchain_default_opt),
+                     "Default: fractal,0.5", &parse_callchain_opt, callchain_default_opt),
         OPT_STRING('d', "dsos", &dso_list_str, "dso[,dso...]",
                    "only consider symbols in these dsos"),
         OPT_STRING('C', "comms", &comm_list_str, "comm[,comm...]",
                    "only consider symbols in these comms"),
         OPT_STRING('S', "symbols", &sym_list_str, "symbol[,symbol...]",
                    "only consider these symbols"),
+        OPT_STRING('w', "column-widths", &col_width_list_str,
+                   "width[,width...]",
+                   "don't try to adjust column width, use these fixed values"),
+        OPT_STRING('t', "field-separator", &field_sep, "separator",
+                   "separator for columns, no spaces will be added between "
+                   "columns '.' is reserved."),
         OPT_END()
 };
 
@@ -1919,7 +2015,8 @@ static void setup_sorting(void)
 }
 
 static void setup_list(struct strlist **list, const char *list_str,
-                       const char *list_name)
+                       struct sort_entry *se, const char *list_name,
+                       FILE *fp)
 {
         if (list_str) {
                 *list = strlist__new(true, list_str);
@@ -1928,6 +2025,11 @@ static void setup_list(struct strlist **list, const char *list_str,
                                 list_name);
                         exit(129);
                 }
+                if (strlist__nr_entries(*list) == 1) {
+                        fprintf(fp, "# %s: %s\n", list_name,
+                                strlist__entry(*list, 0)->s);
+                        se->elide = true;
+                }
         }
 }
 
@@ -1941,9 +2043,10 @@ int cmd_report(int argc, const char **argv, const char *prefix __used)
 
         setup_sorting();
 
-        if (parent_pattern != default_parent_pattern)
+        if (parent_pattern != default_parent_pattern) {
                 sort_dimension__add("parent");
-        else
+                sort_parent.elide = 1;
+        } else
                 exclude_other = 0;
 
         /*
@@ -1952,11 +2055,17 @@ int cmd_report(int argc, const char **argv, const char *prefix __used)
         if (argc)
                 usage_with_options(report_usage, options);
 
-        setup_list(&dso_list, dso_list_str, "dso");
-        setup_list(&comm_list, comm_list_str, "comm");
-        setup_list(&sym_list, sym_list_str, "symbol");
-
         setup_pager();
 
+        setup_list(&dso_list, dso_list_str, &sort_dso, "dso", stdout);
+        setup_list(&comm_list, comm_list_str, &sort_comm, "comm", stdout);
+        setup_list(&sym_list, sym_list_str, &sort_sym, "symbol", stdout);
+
+        if (field_sep && *field_sep == '.') {
+                fputs("'.' is the only non valid --field-separator argument\n",
+                      stderr);
+                exit(129);
+        }
+
         return __cmd_report();
 }
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 27921a8ce1a9..f9510eeeb6c7 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -511,7 +511,8 @@ int cmd_stat(int argc, const char **argv, const char *prefix __used)
 {
         int status;
 
-        argc = parse_options(argc, argv, options, stat_usage, 0);
+        argc = parse_options(argc, argv, options, stat_usage,
+                PARSE_OPT_STOP_AT_NON_OPTION);
         if (!argc)
                 usage_with_options(stat_usage, options);
         if (run_count <= 0 || run_count > MAX_RUN)
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 95d5c0ae375a..c0a423004e15 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -58,6 +58,7 @@ static u64			count_filter			=  5;
 static int                      print_entries                   = 15;
 
 static int                      target_pid                      = -1;
+static int                      inherit                         =  0;
 static int                      profile_cpu                     = -1;
 static int                      nr_cpus                         =  0;
 static unsigned int             realtime_prio                   =  0;
@@ -549,7 +550,7 @@ int group_fd;
 static void start_counter(int i, int counter)
 {
         struct perf_counter_attr *attr;
-        unsigned int cpu;
+        int cpu;
 
         cpu = profile_cpu;
         if (target_pid == -1 && profile_cpu == -1)
@@ -559,6 +560,7 @@ static void start_counter(int i, int counter)
 
         attr->sample_type       = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
         attr->freq              = freq;
+        attr->inherit           = (cpu < 0) && inherit;
 
 try_again:
         fd[i][counter] = sys_perf_counter_open(attr, target_pid, cpu, group_fd, 0);
@@ -685,6 +687,8 @@ static const struct option options[] = {
                     "only display functions with more events than this"),
         OPT_BOOLEAN('g', "group", &group,
                             "put the counters into a counter group"),
+        OPT_BOOLEAN('i', "inherit", &inherit,
+                    "child tasks inherit counters"),
         OPT_STRING('s', "sym-filter", &sym_filter, "pattern",
                     "only display symbols matchig this pattern"),
         OPT_BOOLEAN('z', "zero", &zero,
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index c5656784c61d..31982ad064b4 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -12,6 +12,8 @@
 #include "util/cache.h"
 #include "util/quote.h"
 #include "util/run-command.h"
+#include "util/parse-events.h"
+#include "util/string.h"
 
 const char perf_usage_string[] =
         "perf [--version] [--help] COMMAND [ARGS]";
@@ -25,6 +27,8 @@ struct pager_config {
         int val;
 };
 
+static char debugfs_mntpt[MAXPATHLEN];
+
 static int pager_command_config(const char *var, const char *value, void *data)
 {
         struct pager_config *c = data;
@@ -56,6 +60,15 @@ static void commit_pager_choice(void) {
         }
 }
 
+static void set_debugfs_path(void)
+{
+        char *path;
+
+        path = getenv(PERF_DEBUGFS_ENVIRONMENT);
+        snprintf(debugfs_path, MAXPATHLEN, "%s/%s", path ?: debugfs_mntpt,
+                 "tracing/events");
+}
+
 static int handle_options(const char*** argv, int* argc, int* envchanged)
 {
         int handled = 0;
@@ -122,6 +135,22 @@ static int handle_options(const char*** argv, int* argc, int* envchanged)
                         setenv(PERF_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
                         if (envchanged)
                                 *envchanged = 1;
+                } else if (!strcmp(cmd, "--debugfs-dir")) {
+                        if (*argc < 2) {
+                                fprintf(stderr, "No directory given for --debugfs-dir.\n");
+                                usage(perf_usage_string);
+                        }
+                        strncpy(debugfs_mntpt, (*argv)[1], MAXPATHLEN);
+                        debugfs_mntpt[MAXPATHLEN - 1] = '\0';
+                        if (envchanged)
+                                *envchanged = 1;
+                        (*argv)++;
+                        (*argc)--;
+                } else if (!prefixcmp(cmd, "--debugfs-dir=")) {
+                        strncpy(debugfs_mntpt, cmd + 14, MAXPATHLEN);
+                        debugfs_mntpt[MAXPATHLEN - 1] = '\0';
+                        if (envchanged)
+                                *envchanged = 1;
                 } else {
                         fprintf(stderr, "Unknown option: %s\n", cmd);
                         usage(perf_usage_string);
@@ -228,6 +257,7 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
         if (use_pager == -1 && p->option & USE_PAGER)
                 use_pager = 1;
         commit_pager_choice();
+        set_debugfs_path();
 
         status = p->fn(argc, argv, prefix);
         if (status)
@@ -346,6 +376,49 @@ static int run_argv(int *argcp, const char ***argv)
         return done_alias;
 }
 
+/* mini /proc/mounts parser: searching for "^blah /mount/point debugfs" */
+static void get_debugfs_mntpt(void)
+{
+        FILE *file;
+        char fs_type[100];
+        char debugfs[MAXPATHLEN];
+
+        /*
+         * try the standard location
+         */
+        if (valid_debugfs_mount("/sys/kernel/debug/") == 0) {
+                strcpy(debugfs_mntpt, "/sys/kernel/debug/");
+                return;
+        }
+
+        /*
+         * try the sane location
+         */
+        if (valid_debugfs_mount("/debug/") == 0) {
+                strcpy(debugfs_mntpt, "/debug/");
+                return;
+        }
+
+        /*
+         * give up and parse /proc/mounts
+         */
+        file = fopen("/proc/mounts", "r");
+        if (file == NULL)
+                return;
+
+        while (fscanf(file, "%*s %"
+                      STR(MAXPATHLEN)
+                      "s %99s %*s %*d %*d\n",
+                      debugfs, fs_type) == 2) {
+                if (strcmp(fs_type, "debugfs") == 0)
+                        break;
+        }
+        fclose(file);
+        if (strcmp(fs_type, "debugfs") == 0) {
+                strncpy(debugfs_mntpt, debugfs, MAXPATHLEN);
+                debugfs_mntpt[MAXPATHLEN - 1] = '\0';
+        }
+}
 
 int main(int argc, const char **argv)
 {
@@ -354,7 +427,8 @@ int main(int argc, const char **argv)
         cmd = perf_extract_argv0_path(argv[0]);
         if (!cmd)
                 cmd = "perf-help";
-
+        /* get debugfs mount point from /proc/mounts */
+        get_debugfs_mntpt();
         /*
          * "perf-xxxx" is the same as "perf xxxx", but we obviously:
          *
@@ -377,6 +451,7 @@ int main(int argc, const char **argv)
         argc--;
         handle_options(&argv, &argc, NULL);
         commit_pager_choice();
+        set_debugfs_path();
         if (argc > 0) {
                 if (!prefixcmp(argv[0], "--"))
                         argv[0] += 2;
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 63e67cc5487b..e5148e2b6134 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -1,7 +1,13 @@
 #ifndef _PERF_PERF_H
 #define _PERF_PERF_H
 
-#if defined(__x86_64__) || defined(__i386__)
+#if defined(__i386__)
+#include "../../arch/x86/include/asm/unistd.h"
+#define rmb()           asm volatile("lock; addl $0,0(%%esp)" ::: "memory")
+#define cpu_relax()     asm volatile("rep; nop" ::: "memory");
+#endif
+
+#if defined(__x86_64__)
 #include "../../arch/x86/include/asm/unistd.h"
 #define rmb()           asm volatile("lfence" ::: "memory")
 #define cpu_relax()     asm volatile("rep; nop" ::: "memory");
diff --git a/tools/perf/util/cache.h b/tools/perf/util/cache.h
index 161d5f413e28..4b50c412b9c5 100644
--- a/tools/perf/util/cache.h
+++ b/tools/perf/util/cache.h
@@ -18,6 +18,7 @@
 #define PERFATTRIBUTES_FILE ".perfattributes"
 #define INFOATTRIBUTES_FILE "info/attributes"
 #define ATTRIBUTE_MACRO_PREFIX "[attr]"
+#define PERF_DEBUGFS_ENVIRONMENT "PERF_DEBUGFS_DIR"
 
 typedef int (*config_fn_t)(const char *, const char *, void *);
 extern int perf_default_config(const char *, const char *, void *);
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index b5ef53ad4c7a..bf280449fcfd 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -16,7 +16,7 @@ struct perf_header {
         int frozen;
         int attrs, size;
         struct perf_header_attr **attr;
-        off_t attr_offset;
+        s64 attr_offset;
         u64 data_offset;
         u64 data_size;
 };
diff --git a/tools/perf/util/include/linux/kernel.h b/tools/perf/util/include/linux/kernel.h
index 99c1b3d1edd9..a6b87390cb52 100644
--- a/tools/perf/util/include/linux/kernel.h
+++ b/tools/perf/util/include/linux/kernel.h
@@ -18,4 +18,12 @@
         (type *)((char *)__mptr - offsetof(type, member)); })
 #endif
 
+#ifndef max
+#define max(x, y) ({                            \
+        typeof(x) _max1 = (x);                  \
+        typeof(y) _max2 = (y);                  \
+        (void) (&_max1 == &_max2);              \
+        _max1 > _max2 ? _max1 : _max2; })
+#endif
+
 #endif
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 5184959e0615..7bdad8df22a6 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -5,6 +5,7 @@
 #include "parse-events.h"
 #include "exec_cmd.h"
 #include "string.h"
+#include "cache.h"
 
 extern char *strcasestr(const char *haystack, const char *needle);
 
@@ -19,6 +20,8 @@ struct event_symbol {
         char    *alias;
 };
 
+char debugfs_path[MAXPATHLEN];
+
 #define CHW(x) .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_##x
 #define CSW(x) .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_##x
 
@@ -71,8 +74,8 @@ static char *sw_event_names[] = {
 #define MAX_ALIASES 8
 
 static char *hw_cache[][MAX_ALIASES] = {
- { "L1-d$",     "l1-d",         "l1d",          "L1-data",              },
- { "L1-i$",     "l1-i",         "l1i",          "L1-instruction",       },
+ { "L1-dcache", "l1-d",         "l1d",          "L1-data",              },
+ { "L1-icache", "l1-i",         "l1i",          "L1-instruction",       },
  { "LLC",       "L2"                                                    },
  { "dTLB",      "d-tlb",        "Data-TLB",                             },
  { "iTLB",      "i-tlb",        "Instruction-TLB",                      },
@@ -110,6 +113,88 @@ static unsigned long hw_cache_stat[C(MAX)] = {
  [C(BPU)]       = (CACHE_READ),
 };
 
+#define for_each_subsystem(sys_dir, sys_dirent, sys_next, file, st)            \
+        while (!readdir_r(sys_dir, &sys_dirent, &sys_next) && sys_next)        \
+        if (snprintf(file, MAXPATHLEN, "%s/%s", debugfs_path,                  \
+                        sys_dirent.d_name) &&                                  \
+           (!stat(file, &st)) && (S_ISDIR(st.st_mode)) &&                      \
+           (strcmp(sys_dirent.d_name, ".")) &&                                 \
+           (strcmp(sys_dirent.d_name, "..")))
+
+#define for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next, file, st)    \
+        while (!readdir_r(evt_dir, &evt_dirent, &evt_next) && evt_next)        \
+        if (snprintf(file, MAXPATHLEN, "%s/%s/%s", debugfs_path,               \
+                     sys_dirent.d_name, evt_dirent.d_name) &&                  \
+           (!stat(file, &st)) && (S_ISDIR(st.st_mode)) &&                      \
+           (strcmp(evt_dirent.d_name, ".")) &&                                 \
+           (strcmp(evt_dirent.d_name, "..")))
+
+#define MAX_EVENT_LENGTH 30
+
+int valid_debugfs_mount(const char *debugfs)
+{
+        struct statfs st_fs;
+
+        if (statfs(debugfs, &st_fs) < 0)
+                return -ENOENT;
+        else if (st_fs.f_type != (long) DEBUGFS_MAGIC)
+                return -ENOENT;
+        return 0;
+}
+
+static char *tracepoint_id_to_name(u64 config)
+{
+        static char tracepoint_name[2 * MAX_EVENT_LENGTH];
+        DIR *sys_dir, *evt_dir;
+        struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
+        struct stat st;
+        char id_buf[4];
+        int fd;
+        u64 id;
+        char evt_path[MAXPATHLEN];
+
+        if (valid_debugfs_mount(debugfs_path))
+                return "unkown";
+
+        sys_dir = opendir(debugfs_path);
+        if (!sys_dir)
+                goto cleanup;
+
+        for_each_subsystem(sys_dir, sys_dirent, sys_next, evt_path, st) {
+                evt_dir = opendir(evt_path);
+                if (!evt_dir)
+                        goto cleanup;
+                for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next,
+                                                                evt_path, st) {
+                        snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id",
+                                 debugfs_path, sys_dirent.d_name,
+                                 evt_dirent.d_name);
+                        fd = open(evt_path, O_RDONLY);
+                        if (fd < 0)
+                                continue;
+                        if (read(fd, id_buf, sizeof(id_buf)) < 0) {
+                                close(fd);
+                                continue;
+                        }
+                        close(fd);
+                        id = atoll(id_buf);
+                        if (id == config) {
+                                closedir(evt_dir);
+                                closedir(sys_dir);
+                                snprintf(tracepoint_name, 2 * MAX_EVENT_LENGTH,
+                                        "%s:%s", sys_dirent.d_name,
+                                        evt_dirent.d_name);
+                                return tracepoint_name;
+                        }
+                }
+                closedir(evt_dir);
+        }
+
+cleanup:
+        closedir(sys_dir);
+        return "unkown";
+}
+
 static int is_cache_op_valid(u8 cache_type, u8 cache_op)
 {
         if (hw_cache_stat[cache_type] & COP(cache_op))
@@ -177,6 +262,9 @@ char *event_name(int counter)
                         return sw_event_names[config];
                 return "unknown-software";
 
+        case PERF_TYPE_TRACEPOINT:
+                return tracepoint_id_to_name(config);
+
         default:
                 break;
         }
@@ -265,6 +353,53 @@ parse_generic_hw_event(const char **str, struct perf_counter_attr *attr)
         return 1;
 }
 
+static int parse_tracepoint_event(const char **strp,
+                                    struct perf_counter_attr *attr)
+{
+        const char *evt_name;
+        char sys_name[MAX_EVENT_LENGTH];
+        char id_buf[4];
+        int fd;
+        unsigned int sys_length, evt_length;
+        u64 id;
+        char evt_path[MAXPATHLEN];
+
+        if (valid_debugfs_mount(debugfs_path))
+                return 0;
+
+        evt_name = strchr(*strp, ':');
+        if (!evt_name)
+                return 0;
+
+        sys_length = evt_name - *strp;
+        if (sys_length >= MAX_EVENT_LENGTH)
+                return 0;
+
+        strncpy(sys_name, *strp, sys_length);
+        sys_name[sys_length] = '\0';
+        evt_name = evt_name + 1;
+        evt_length = strlen(evt_name);
+        if (evt_length >= MAX_EVENT_LENGTH)
+                return 0;
+
+        snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
+                 sys_name, evt_name);
+        fd = open(evt_path, O_RDONLY);
+        if (fd < 0)
+                return 0;
+
+        if (read(fd, id_buf, sizeof(id_buf)) < 0) {
+                close(fd);
+                return 0;
+        }
+        close(fd);
+        id = atoll(id_buf);
+        attr->config = id;
+        attr->type = PERF_TYPE_TRACEPOINT;
+        *strp = evt_name + evt_length;
+        return 1;
+}
+
 static int check_events(const char *str, unsigned int i)
 {
         int n;
@@ -374,7 +509,8 @@ parse_event_modifier(const char **strp, struct perf_counter_attr *attr)
  */
 static int parse_event_symbols(const char **str, struct perf_counter_attr *attr)
 {
-        if (!(parse_raw_event(str, attr) ||
+        if (!(parse_tracepoint_event(str, attr) ||
+              parse_raw_event(str, attr) ||
               parse_numeric_event(str, attr) ||
               parse_symbolic_event(str, attr) ||
               parse_generic_hw_event(str, attr)))
@@ -423,6 +559,42 @@ static const char * const event_type_descriptors[] = {
 };
 
 /*
+ * Print the events from <debugfs_mount_point>/tracing/events
+ */
+
+static void print_tracepoint_events(void)
+{
+        DIR *sys_dir, *evt_dir;
+        struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
+        struct stat st;
+        char evt_path[MAXPATHLEN];
+
+        if (valid_debugfs_mount(debugfs_path))
+                return;
+
+        sys_dir = opendir(debugfs_path);
+        if (!sys_dir)
+                goto cleanup;
+
+        for_each_subsystem(sys_dir, sys_dirent, sys_next, evt_path, st) {
+                evt_dir = opendir(evt_path);
+                if (!evt_dir)
+                        goto cleanup;
+                for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next,
+                                                                evt_path, st) {
+                        snprintf(evt_path, MAXPATHLEN, "%s:%s",
+                                 sys_dirent.d_name, evt_dirent.d_name);
+                        fprintf(stderr, "  %-40s [%s]\n", evt_path,
+                                event_type_descriptors[PERF_TYPE_TRACEPOINT+1]);
+                }
+                closedir(evt_dir);
+        }
+
+cleanup:
+        closedir(sys_dir);
+}
+
+/*
  * Print the help text for the event symbols:
  */
 void print_events(void)
@@ -436,7 +608,7 @@ void print_events(void)
 
         for (i = 0; i < ARRAY_SIZE(event_symbols); i++, syms++) {
                 type = syms->type + 1;
-                if (type > ARRAY_SIZE(event_type_descriptors))
+                if (type >= ARRAY_SIZE(event_type_descriptors))
                         type = 0;
 
                 if (type != prev_type)
@@ -472,5 +644,7 @@ void print_events(void)
                 "rNNN");
         fprintf(stderr, "\n");
 
+        print_tracepoint_events();
+
         exit(129);
 }
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index e3d552908e60..1ea5d09b6eb1 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -3,6 +3,8 @@
  * Parse symbolic events/counts passed in as options:
  */
 
+struct option;
+
 extern int                      nr_counters;
 
 extern struct perf_counter_attr attrs[MAX_COUNTERS];
@@ -15,3 +17,6 @@ extern int parse_events(const struct option *opt, const char *str, int unset);
 
 extern void print_events(void);
 
+extern char debugfs_path[];
+extern int valid_debugfs_mount(const char *debugfs);
+
diff --git a/tools/perf/util/string.h b/tools/perf/util/string.h
index 3dca2f654cd0..bf39dfadfd24 100644
--- a/tools/perf/util/string.h
+++ b/tools/perf/util/string.h
@@ -5,4 +5,7 @@
 
 int hex2u64(const char *ptr, u64 *val);
 
+#define _STR(x) #x
+#define STR(x) _STR(x)
+
 #endif
diff --git a/tools/perf/util/strlist.c b/tools/perf/util/strlist.c
index 025a78edfffe..7ad38171dc2b 100644
--- a/tools/perf/util/strlist.c
+++ b/tools/perf/util/strlist.c
@@ -64,6 +64,7 @@ int strlist__add(struct strlist *self, const char *new_entry)
 
         rb_link_node(&sn->rb_node, parent, p);
         rb_insert_color(&sn->rb_node, &self->entries);
+        ++self->nr_entries;
 
         return 0;
 }
@@ -155,8 +156,9 @@ struct strlist *strlist__new(bool dupstr, const char *slist)
         struct strlist *self = malloc(sizeof(*self));
 
         if (self != NULL) {
-                self->entries = RB_ROOT;
-                self->dupstr = dupstr;
+                self->entries    = RB_ROOT;
+                self->dupstr     = dupstr;
+                self->nr_entries = 0;
                 if (slist && strlist__parse_list(self, slist) != 0)
                         goto out_error;
         }
@@ -182,3 +184,17 @@ void strlist__delete(struct strlist *self)
                 free(self);
         }
 }
+
+struct str_node *strlist__entry(const struct strlist *self, unsigned int idx)
+{
+        struct rb_node *nd;
+
+        for (nd = rb_first(&self->entries); nd; nd = rb_next(nd)) {
+                struct str_node *pos = rb_entry(nd, struct str_node, rb_node);
+
+                if (!idx--)
+                        return pos;
+        }
+
+        return NULL;
+}
diff --git a/tools/perf/util/strlist.h b/tools/perf/util/strlist.h
index 2fdcfee87586..921818e44a54 100644
--- a/tools/perf/util/strlist.h
+++ b/tools/perf/util/strlist.h
@@ -11,7 +11,8 @@ struct str_node {
 
 struct strlist {
         struct rb_root entries;
-        bool dupstr;
+        unsigned int   nr_entries;
+        bool           dupstr;
 };
 
 struct strlist *strlist__new(bool dupstr, const char *slist);
@@ -21,11 +22,17 @@ void strlist__remove(struct strlist *self, struct str_node *sn);
 int strlist__load(struct strlist *self, const char *filename);
 int strlist__add(struct strlist *self, const char *str);
 
+struct str_node *strlist__entry(const struct strlist *self, unsigned int idx);
 bool strlist__has_entry(struct strlist *self, const char *entry);
 
 static inline bool strlist__empty(const struct strlist *self)
 {
-        return rb_first(&self->entries) == NULL;
+        return self->nr_entries == 0;
+}
+
+static inline unsigned int strlist__nr_entries(const struct strlist *self)
+{
+        return self->nr_entries;
 }
 
 int strlist__parse_list(struct strlist *self, const char *s);
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 4683b67b5ee4..28106059bf12 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -6,9 +6,15 @@
 #include <libelf.h>
 #include <gelf.h>
 #include <elf.h>
+#include <bfd.h>
 
 const char *sym_hist_filter;
 
+#ifndef DMGL_PARAMS
+#define DMGL_PARAMS      (1 << 0)       /* Include function args */
+#define DMGL_ANSI        (1 << 1)       /* Include const, volatile, etc */
+#endif
+
 static struct symbol *symbol__new(u64 start, u64 len,
                                   const char *name, unsigned int priv_size,
                                   u64 obj_start, int verbose)
@@ -65,6 +71,7 @@ struct dso *dso__new(const char *name, unsigned int sym_priv_size)
                 self->syms = RB_ROOT;
                 self->sym_priv_size = sym_priv_size;
                 self->find_symbol = dso__find_symbol;
+                self->slen_calculated = 0;
         }
 
         return self;
@@ -373,36 +380,61 @@ static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
              idx < nr_entries; \
              ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
 
-static int dso__synthesize_plt_symbols(struct  dso *self, Elf *elf,
-                                       GElf_Ehdr *ehdr, Elf_Scn *scn_dynsym,
-                                       GElf_Shdr *shdr_dynsym,
-                                       size_t dynsym_idx, int verbose)
+/*
+ * We need to check if we have a .dynsym, so that we can handle the
+ * .plt, synthesizing its symbols, that aren't on the symtabs (be it
+ * .dynsym or .symtab).
+ * And always look at the original dso, not at debuginfo packages, that
+ * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
+ */
+static int dso__synthesize_plt_symbols(struct  dso *self, int verbose)
 {
         uint32_t nr_rel_entries, idx;
         GElf_Sym sym;
         u64 plt_offset;
         GElf_Shdr shdr_plt;
         struct symbol *f;
-        GElf_Shdr shdr_rel_plt;
+        GElf_Shdr shdr_rel_plt, shdr_dynsym;
         Elf_Data *reldata, *syms, *symstrs;
-        Elf_Scn *scn_plt_rel, *scn_symstrs;
+        Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
+        size_t dynsym_idx;
+        GElf_Ehdr ehdr;
         char sympltname[1024];
-        int nr = 0, symidx;
+        Elf *elf;
+        int nr = 0, symidx, fd, err = 0;
+
+        fd = open(self->name, O_RDONLY);
+        if (fd < 0)
+                goto out;
+
+        elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
+        if (elf == NULL)
+                goto out_close;
+
+        if (gelf_getehdr(elf, &ehdr) == NULL)
+                goto out_elf_end;
+
+        scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
+                                         ".dynsym", &dynsym_idx);
+        if (scn_dynsym == NULL)
+                goto out_elf_end;
 
-        scn_plt_rel = elf_section_by_name(elf, ehdr, &shdr_rel_plt,
+        scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
                                           ".rela.plt", NULL);
         if (scn_plt_rel == NULL) {
-                scn_plt_rel = elf_section_by_name(elf, ehdr, &shdr_rel_plt,
+                scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
                                                   ".rel.plt", NULL);
                 if (scn_plt_rel == NULL)
-                        return 0;
+                        goto out_elf_end;
         }
 
+        err = -1;
+
         if (shdr_rel_plt.sh_link != dynsym_idx)
-                return 0;
+                goto out_elf_end;
 
-        if (elf_section_by_name(elf, ehdr, &shdr_plt, ".plt", NULL) == NULL)
-                return 0;
+        if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
+                goto out_elf_end;
 
         /*
          * Fetch the relocation section to find the indexes to the GOT
@@ -410,19 +442,19 @@ static int dso__synthesize_plt_symbols(struct  dso *self, Elf *elf,
          */
         reldata = elf_getdata(scn_plt_rel, NULL);
         if (reldata == NULL)
-                return -1;
+                goto out_elf_end;
 
         syms = elf_getdata(scn_dynsym, NULL);
         if (syms == NULL)
-                return -1;
+                goto out_elf_end;
 
-        scn_symstrs = elf_getscn(elf, shdr_dynsym->sh_link);
+        scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
         if (scn_symstrs == NULL)
-                return -1;
+                goto out_elf_end;
 
         symstrs = elf_getdata(scn_symstrs, NULL);
         if (symstrs == NULL)
-                return -1;
+                goto out_elf_end;
 
         nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
         plt_offset = shdr_plt.sh_offset;
@@ -441,7 +473,7 @@ static int dso__synthesize_plt_symbols(struct  dso *self, Elf *elf,
                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
                                         sympltname, self->sym_priv_size, 0, verbose);
                         if (!f)
-                                return -1;
+                                goto out_elf_end;
 
                         dso__insert_symbol(self, f);
                         ++nr;
@@ -459,19 +491,25 @@ static int dso__synthesize_plt_symbols(struct  dso *self, Elf *elf,
                         f = symbol__new(plt_offset, shdr_plt.sh_entsize,
                                         sympltname, self->sym_priv_size, 0, verbose);
                         if (!f)
-                                return -1;
+                                goto out_elf_end;
 
                         dso__insert_symbol(self, f);
                         ++nr;
                 }
-        } else {
-                /*
-                 * TODO: There are still one more shdr_rel_plt.sh_type
-                 * I have to investigate, but probably should be ignored.
-                 */
         }
 
-        return nr;
+        err = 0;
+out_elf_end:
+        elf_end(elf);
+out_close:
+        close(fd);
+
+        if (err == 0)
+                return nr;
+out:
+        fprintf(stderr, "%s: problems reading %s PLT info.\n",
+                __func__, self->name);
+        return 0;
 }
 
 static int dso__load_sym(struct dso *self, int fd, const char *name,
@@ -485,10 +523,9 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
         GElf_Shdr shdr;
         Elf_Data *syms;
         GElf_Sym sym;
-        Elf_Scn *sec, *sec_dynsym, *sec_strndx;
+        Elf_Scn *sec, *sec_strndx;
         Elf *elf;
-        size_t dynsym_idx;
-        int nr = 0;
+        int nr = 0, kernel = !strcmp("[kernel]", self->name);
 
         elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
         if (elf == NULL) {
@@ -504,32 +541,11 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
                 goto out_elf_end;
         }
 
-        /*
-         * We need to check if we have a .dynsym, so that we can handle the
-         * .plt, synthesizing its symbols, that aren't on the symtabs (be it
-         * .dynsym or .symtab)
-         */
-        sec_dynsym = elf_section_by_name(elf, &ehdr, &shdr,
-                                         ".dynsym", &dynsym_idx);
-        if (sec_dynsym != NULL) {
-                nr = dso__synthesize_plt_symbols(self, elf, &ehdr,
-                                                 sec_dynsym, &shdr,
-                                                 dynsym_idx, verbose);
-                if (nr < 0)
-                        goto out_elf_end;
-        }
-
-        /*
-         * But if we have a full .symtab (that is a superset of .dynsym) we
-         * should add the symbols not in the .dynsyn
-         */
         sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
         if (sec == NULL) {
-                if (sec_dynsym == NULL)
+                sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
+                if (sec == NULL)
                         goto out_elf_end;
-
-                sec = sec_dynsym;
-                gelf_getshdr(sec, &shdr);
         }
 
         syms = elf_getdata(sec, NULL);
@@ -555,12 +571,17 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
         nr_syms = shdr.sh_size / shdr.sh_entsize;
 
         memset(&sym, 0, sizeof(sym));
-        self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
+        if (!kernel) {
+                self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
                                 elf_section_by_name(elf, &ehdr, &shdr,
                                                      ".gnu.prelink_undo",
                                                      NULL) != NULL);
+        } else self->adjust_symbols = 0;
+
         elf_symtab__for_each_symbol(syms, nr_syms, index, sym) {
                 struct symbol *f;
+                const char *name;
+                char *demangled;
                 u64 obj_start;
                 struct section *section = NULL;
                 int is_label = elf_sym__is_label(&sym);
@@ -599,10 +620,19 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
                                 goto out_elf_end;
                         }
                 }
+                /*
+                 * We need to figure out if the object was created from C++ sources
+                 * DWARF DW_compile_unit has this, but we don't always have access
+                 * to it...
+                 */
+                name = elf_sym__name(&sym, symstrs);
+                demangled = bfd_demangle(NULL, name, DMGL_PARAMS | DMGL_ANSI);
+                if (demangled != NULL)
+                        name = demangled;
 
-                f = symbol__new(sym.st_value, sym.st_size,
-                                elf_sym__name(&sym, symstrs),
+                f = symbol__new(sym.st_value, sym.st_size, name,
                                 self->sym_priv_size, obj_start, verbose);
+                free(demangled);
                 if (!f)
                         goto out_elf_end;
 
@@ -668,6 +698,11 @@ more:
         if (!ret)
                 goto more;
 
+        if (ret > 0) {
+                int nr_plt = dso__synthesize_plt_symbols(self, verbose);
+                if (nr_plt > 0)
+                        ret += nr_plt;
+        }
 out:
         free(name);
         return ret;
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 7918cffb23cd..2f92b21c712d 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -25,6 +25,7 @@ struct dso {
         struct symbol    *(*find_symbol)(struct dso *, u64 ip);
         unsigned int     sym_priv_size;
         unsigned char    adjust_symbols;
+        unsigned char    slen_calculated;
         char             name[0];
 };
 
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index b4be6071c105..68fe157d72fb 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -50,6 +50,7 @@
 #include <unistd.h>
 #include <stdio.h>
 #include <sys/stat.h>
+#include <sys/statfs.h>
 #include <fcntl.h>
 #include <stddef.h>
 #include <stdlib.h>
@@ -80,6 +81,7 @@
 #include <netdb.h>
 #include <pwd.h>
 #include <inttypes.h>
+#include "../../../include/linux/magic.h"
 
 #ifndef NO_ICONV
 #include <iconv.h>