perf top: Live TUI Annotation

Now one has just to press the right key, 'a' or Enter on the main 'perf
top --tui' screen to live annotate the symbol under the cursor.

The annotate window starts centered on the hottest line (the one with
most samples so far) then TAB and shift+TAB can be used to go to the
prev/next hot line.

Pressing 'H' at any point will center again the screen on the hottest
line.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

5 files changed, 156 insertions, 58 deletions

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index c9fd66d4a08..f88a2630e1f 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -92,7 +92,6 @@ static bool			dump_symtab                     =  false;
 static struct winsize           winsize;
 
 static const char               *sym_filter                     =   NULL;
-struct sym_entry                *sym_filter_entry               =   NULL;
 struct sym_entry                *sym_filter_entry_sched         =   NULL;
 static int                      sym_pcnt_filter                 =      5;
 
@@ -168,18 +167,19 @@ static int parse_source(struct sym_entry *syme)
         pthread_mutex_lock(&notes->lock);
 
         if (symbol__alloc_hist(sym, top.evlist->nr_entries) < 0) {
+                pthread_mutex_unlock(&notes->lock);
                 pr_err("Not enough memory for annotating '%s' symbol!\n",
                        sym->name);
                 sleep(1);
-                goto out_unlock;
+                return err;
         }
 
         err = symbol__annotate(sym, syme->map, 0);
         if (err == 0) {
 out_assign:
-        sym_filter_entry = syme;
+                top.sym_filter_entry = syme;
         }
-out_unlock:
+
         pthread_mutex_unlock(&notes->lock);
         return err;
 }
@@ -195,7 +195,7 @@ static void record_precise_ip(struct sym_entry *syme, int counter, u64 ip)
         struct annotation *notes;
         struct symbol *sym;
 
-        if (syme != sym_filter_entry)
+        if (syme != top.sym_filter_entry)
                 return;
 
         sym = sym_entry__symbol(syme);
@@ -275,8 +275,8 @@ static void print_sym_table(struct perf_session *session)
                        session->hists.stats.total_lost);
         }
 
-        if (sym_filter_entry) {
-                show_details(sym_filter_entry);
+        if (top.sym_filter_entry) {
+                show_details(top.sym_filter_entry);
                 return;
         }
 
@@ -417,8 +417,8 @@ static void print_mapped_keys(void)
 {
         char *name = NULL;
 
-        if (sym_filter_entry) {
-                struct symbol *sym = sym_entry__symbol(sym_filter_entry);
+        if (top.sym_filter_entry) {
+                struct symbol *sym = sym_entry__symbol(top.sym_filter_entry);
                 name = sym->name;
         }
 
@@ -549,15 +549,15 @@ static void handle_keypress(struct perf_session *session, int c)
                                 perf_session__fprintf_dsos(session, stderr);
                         exit(0);
                 case 's':
-                        prompt_symbol(&sym_filter_entry, "Enter details symbol");
+                        prompt_symbol(&top.sym_filter_entry, "Enter details symbol");
                         break;
                 case 'S':
-                        if (!sym_filter_entry)
+                        if (!top.sym_filter_entry)
                                 break;
                         else {
-                                struct sym_entry *syme = sym_filter_entry;
+                                struct sym_entry *syme = top.sym_filter_entry;
 
-                                sym_filter_entry = NULL;
+                                top.sym_filter_entry = NULL;
                                 __zero_source_counters(syme);
                         }
                         break;
@@ -656,7 +656,7 @@ static int symbol_filter(struct map *map, struct symbol *sym)
         syme->map = map;
         symbol__annotate_init(map, sym);
 
-        if (!sym_filter_entry && sym_filter && !strcmp(name, sym_filter)) {
+        if (!top.sym_filter_entry && sym_filter && !strcmp(name, sym_filter)) {
                 /* schedule initial sym_filter_entry setup */
                 sym_filter_entry_sched = syme;
                 sym_filter = NULL;
@@ -750,13 +750,13 @@ static void perf_event__process_sample(const union perf_event *event,
 
         /* let's see, whether we need to install initial sym_filter_entry */
         if (sym_filter_entry_sched) {
-                sym_filter_entry = sym_filter_entry_sched;
+                top.sym_filter_entry = sym_filter_entry_sched;
                 sym_filter_entry_sched = NULL;
-                if (parse_source(sym_filter_entry) < 0) {
-                        struct symbol *sym = sym_entry__symbol(sym_filter_entry);
+                if (parse_source(top.sym_filter_entry) < 0) {
+                        struct symbol *sym = sym_entry__symbol(top.sym_filter_entry);
 
                         pr_err("Can't annotate %s", sym->name);
-                        if (sym_filter_entry->map->dso->origin == DSO__ORIG_KERNEL) {
+                        if (top.sym_filter_entry->map->dso->origin == DSO__ORIG_KERNEL) {
                                 pr_err(": No vmlinux file was found in the path:\n");
                                 machine__fprintf_vmlinux_path(machine, stderr);
                         } else
diff --git a/tools/perf/util/annotate.h b/tools/perf/util/annotate.h
index e848803fcd4..c2c28689680 100644
--- a/tools/perf/util/annotate.h
+++ b/tools/perf/util/annotate.h
@@ -90,12 +90,14 @@ int symbol__tty_annotate(struct symbol *sym, struct map *map, int evidx,
 
 #ifdef NO_NEWT_SUPPORT
 static inline int symbol__tui_annotate(struct symbol *sym __used,
-                                       struct map *map __used, int evidx __used)
+                                       struct map *map __used,
+                                       int evidx __used, int refresh __used)
 {
         return 0;
 }
 #else
-int symbol__tui_annotate(struct symbol *sym, struct map *map, int evidx);
+int symbol__tui_annotate(struct symbol *sym, struct map *map, int evidx,
+                         int refresh);
 #endif
 
 #endif  /* __PERF_ANNOTATE_H */
diff --git a/tools/perf/util/top.h b/tools/perf/util/top.h
index 4f769f47e19..e8d28e2ecdb 100644
--- a/tools/perf/util/top.h
+++ b/tools/perf/util/top.h
@@ -44,6 +44,7 @@ struct perf_top {
         pid_t              target_pid, target_tid;
         bool               hide_kernel_symbols, hide_user_symbols, zero;
         const char         *cpu_list;
+        struct sym_entry   *sym_filter_entry;
         struct perf_evsel  *sym_evsel;
 };
 
diff --git a/tools/perf/util/ui/browsers/annotate.c b/tools/perf/util/ui/browsers/annotate.c
index cfb5a27f15d..8c17a8730e4 100644
--- a/tools/perf/util/ui/browsers/annotate.c
+++ b/tools/perf/util/ui/browsers/annotate.c
@@ -6,6 +6,7 @@
 #include "../../sort.h"
 #include "../../symbol.h"
 #include "../../annotate.h"
+#include <pthread.h>
 
 static void ui__error_window(const char *fmt, ...)
 {
@@ -138,46 +139,108 @@ static void annotate_browser__set_top(struct annotate_browser *self,
         self->curr_hot = nd;
 }
 
-static int annotate_browser__run(struct annotate_browser *self)
+static void annotate_browser__calc_percent(struct annotate_browser *browser,
+                                           int evidx)
 {
-        struct rb_node *nd;
+        struct symbol *sym = browser->b.priv;
+        struct annotation *notes = symbol__annotation(sym);
+        struct objdump_line *pos;
+
+        browser->entries = RB_ROOT;
+
+        pthread_mutex_lock(&notes->lock);
+
+        list_for_each_entry(pos, &notes->src->source, node) {
+                struct objdump_line_rb_node *rbpos = objdump_line__rb(pos);
+                rbpos->percent = objdump_line__calc_percent(pos, sym, evidx);
+                if (rbpos->percent < 0.01) {
+                        RB_CLEAR_NODE(&rbpos->rb_node);
+                        continue;
+                }
+                objdump__insert_line(&browser->entries, rbpos);
+        }
+        pthread_mutex_unlock(&notes->lock);
+
+        browser->curr_hot = rb_last(&browser->entries);
+}
+
+static int annotate_browser__run(struct annotate_browser *self, int evidx,
+                                 int refresh)
+{
+        struct rb_node *nd = NULL;
         struct symbol *sym = self->b.priv;
+        /*
+         * RIGHT To allow builtin-annotate to cycle thru multiple symbols by
+         * examining the exit key for this function.
+         */
+        int exit_keys[] = { 'H', NEWT_KEY_TAB, NEWT_KEY_UNTAB,
+                            NEWT_KEY_RIGHT, 0 };
         int key;
 
         if (ui_browser__show(&self->b, sym->name,
-                             "<-, -> or ESC: exit, TAB/shift+TAB: cycle thru samples") < 0)
+                             "<-, -> or ESC: exit, TAB/shift+TAB: "
+                             "cycle hottest lines, H: Hottest") < 0)
                 return -1;
-        /*
-         * To allow builtin-annotate to cycle thru multiple symbols by
-         * examining the exit key for this function.
-         */
-        ui_browser__add_exit_key(&self->b, NEWT_KEY_RIGHT);
+
+        ui_browser__add_exit_keys(&self->b, exit_keys);
+        annotate_browser__calc_percent(self, evidx);
+
+        if (self->curr_hot)
+                annotate_browser__set_top(self, self->curr_hot);
 
         nd = self->curr_hot;
-        if (nd) {
-                int tabs[] = { NEWT_KEY_TAB, NEWT_KEY_UNTAB, 0 };
-                ui_browser__add_exit_keys(&self->b, tabs);
-        }
+
+        if (refresh != 0)
+                newtFormSetTimer(self->b.form, refresh);
 
         while (1) {
                 key = ui_browser__run(&self->b);
 
+                if (refresh != 0) {
+                        annotate_browser__calc_percent(self, evidx);
+                        /*
+                         * Current line focus got out of the list of most active
+                         * lines, NULL it so that if TAB|UNTAB is pressed, we
+                         * move to curr_hot (current hottest line).
+                         */
+                        if (nd != NULL && RB_EMPTY_NODE(nd))
+                                nd = NULL;
+                }
+
                 switch (key) {
+                case -1:
+                        /*
+                         * FIXME we need to check if it was
+                         * es.reason == NEWT_EXIT_TIMER
+                         */
+                        if (refresh != 0)
+                                symbol__annotate_decay_histogram(sym, evidx);
+                        continue;
                 case NEWT_KEY_TAB:
-                        nd = rb_prev(nd);
-                        if (nd == NULL)
-                                nd = rb_last(&self->entries);
-                        annotate_browser__set_top(self, nd);
+                        if (nd != NULL) {
+                                nd = rb_prev(nd);
+                                if (nd == NULL)
+                                        nd = rb_last(&self->entries);
+                        } else
+                                nd = self->curr_hot;
                         break;
                 case NEWT_KEY_UNTAB:
-                        nd = rb_next(nd);
-                        if (nd == NULL)
-                                nd = rb_first(&self->entries);
-                        annotate_browser__set_top(self, nd);
+                        if (nd != NULL)
+                                nd = rb_next(nd);
+                                if (nd == NULL)
+                                        nd = rb_first(&self->entries);
+                        else
+                                nd = self->curr_hot;
+                        break;
+                case 'H':
+                        nd = self->curr_hot;
                         break;
                 default:
                         goto out;
                 }
+
+                if (nd != NULL)
+                        annotate_browser__set_top(self, nd);
         }
 out:
         ui_browser__hide(&self->b);
@@ -186,13 +249,13 @@ out:
 
 int hist_entry__tui_annotate(struct hist_entry *he, int evidx)
 {
-        return symbol__tui_annotate(he->ms.sym, he->ms.map, evidx);
+        return symbol__tui_annotate(he->ms.sym, he->ms.map, evidx, 0);
 }
 
-int symbol__tui_annotate(struct symbol *sym, struct map *map, int evidx)
+int symbol__tui_annotate(struct symbol *sym, struct map *map, int evidx,
+                         int refresh)
 {
         struct objdump_line *pos, *n;
-        struct objdump_line_rb_node *rbpos;
         struct annotation *notes = symbol__annotation(sym);
         struct annotate_browser browser = {
                 .b = {
@@ -211,7 +274,7 @@ int symbol__tui_annotate(struct symbol *sym, struct map *map, int evidx)
         if (map->dso->annotate_warned)
                 return -1;
 
-        if (symbol__annotate(sym, map, sizeof(*rbpos)) < 0) {
+        if (symbol__annotate(sym, map, sizeof(struct objdump_line_rb_node)) < 0) {
                 ui__error_window(ui_helpline__last_msg);
                 return -1;
         }
@@ -219,26 +282,17 @@ int symbol__tui_annotate(struct symbol *sym, struct map *map, int evidx)
         ui_helpline__push("Press <- or ESC to exit");
 
         list_for_each_entry(pos, &notes->src->source, node) {
+                struct objdump_line_rb_node *rbpos;
                 size_t line_len = strlen(pos->line);
+
                 if (browser.b.width < line_len)
                         browser.b.width = line_len;
                 rbpos = objdump_line__rb(pos);
                 rbpos->idx = browser.b.nr_entries++;
-                rbpos->percent = objdump_line__calc_percent(pos, sym, evidx);
-                if (rbpos->percent < 0.01)
-                        continue;
-                objdump__insert_line(&browser.entries, rbpos);
         }
 
-        /*
-         * Position the browser at the hottest line.
-         */
-        browser.curr_hot = rb_last(&browser.entries);
-        if (browser.curr_hot)
-                annotate_browser__set_top(&browser, browser.curr_hot);
-
         browser.b.width += 18; /* Percentage */
-        ret = annotate_browser__run(&browser);
+        ret = annotate_browser__run(&browser, evidx, refresh);
         list_for_each_entry_safe(pos, n, &notes->src->source, node) {
                 list_del(&pos->node);
                 objdump_line__free(pos);
diff --git a/tools/perf/util/ui/browsers/top.c b/tools/perf/util/ui/browsers/top.c
index ca6062483a8..377ff58c9ae 100644
--- a/tools/perf/util/ui/browsers/top.c
+++ b/tools/perf/util/ui/browsers/top.c
@@ -7,6 +7,7 @@
  * Released under the GPL v2. (and only v2, not any later version)
  */
 #include "../browser.h"
+#include "../../annotate.h"
 #include "../helpline.h"
 #include "../libslang.h"
 #include "../../evlist.h"
@@ -18,6 +19,7 @@
 struct perf_top_browser {
         struct ui_browser b;
         struct rb_root    root;
+        struct sym_entry  *selection;
         float             sum_ksamples;
         int               dso_width;
         int               dso_short_width;
@@ -60,6 +62,9 @@ static void perf_top_browser__write(struct ui_browser *browser, void *entry, int
         slsmg_write_nstring(width >= syme->map->dso->long_name_len ?
                                 syme->map->dso->long_name :
                                 syme->map->dso->short_name, width);
+
+        if (current_entry)
+                top_browser->selection = syme;
 }
 
 static void perf_top_browser__update_rb_tree(struct perf_top_browser *browser)
@@ -80,21 +85,52 @@ static void perf_top_browser__update_rb_tree(struct perf_top_browser *browser)
         browser->b.nr_entries = top->rb_entries;
 }
 
+static void perf_top_browser__annotate(struct perf_top_browser *browser)
+{
+        struct sym_entry *syme = browser->selection;
+        struct symbol *sym = sym_entry__symbol(syme);
+        struct annotation *notes = symbol__annotation(sym);
+        struct perf_top *top = browser->b.priv;
+
+        if (notes->src != NULL)
+                goto do_annotation;
+
+        pthread_mutex_lock(&notes->lock);
+
+        top->sym_filter_entry = NULL;
+
+        if (symbol__alloc_hist(sym, top->evlist->nr_entries) < 0) {
+                pr_err("Not enough memory for annotating '%s' symbol!\n",
+                       sym->name);
+                pthread_mutex_unlock(&notes->lock);
+                return;
+        }
+
+        top->sym_filter_entry = syme;
+
+        pthread_mutex_unlock(&notes->lock);
+do_annotation:
+        symbol__tui_annotate(sym, syme->map, 0, top->delay_secs * 1000);
+}
+
 static int perf_top_browser__run(struct perf_top_browser *browser)
 {
         int key;
         char title[160];
         struct perf_top *top = browser->b.priv;
         int delay_msecs = top->delay_secs * 1000;
+        int exit_keys[] = { 'a', NEWT_KEY_ENTER, NEWT_KEY_RIGHT, 0, };
 
         perf_top_browser__update_rb_tree(browser);
         perf_top__header_snprintf(top, title, sizeof(title));
         perf_top__reset_sample_counters(top);
 
-        if (ui_browser__show(&browser->b, title, "ESC: exit") < 0)
+        if (ui_browser__show(&browser->b, title,
+                             "ESC: exit, ENTER|->|a: Live Annotate") < 0)
                 return -1;
 
         newtFormSetTimer(browser->b.form, delay_msecs);
+        ui_browser__add_exit_keys(&browser->b, exit_keys);
 
         while (1) {
                 key = ui_browser__run(&browser->b);
@@ -109,7 +145,12 @@ static int perf_top_browser__run(struct perf_top_browser *browser)
                         SLsmg_gotorc(0, 0);
                         slsmg_write_nstring(title, browser->b.width);
                         break;
-                case NEWT_KEY_TAB:
+                case 'a':
+                case NEWT_KEY_RIGHT:
+                case NEWT_KEY_ENTER:
+                        if (browser->selection)
+                                perf_top_browser__annotate(browser);
+                        break;
                 default:
                         goto out;
                 }