perf hists browser: Introduce struct hist_browser title callback

We can now setup title callback for hist_browser, which will be useful
in following changes to create customized hist_browsers.

This also separates struct perf_evsel dependency out of hist_browser
basic code.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1466459899-1166-5-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 17 insertions, 8 deletions

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index 539b69065d9d..a74cbd381607 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -21,9 +21,8 @@
 
 extern void hist_browser__init_hpp(void);
 
-static int hists__browser_title(struct hists *hists,
-                                struct hist_browser_timer *hbt,
-                                char *bf, size_t size);
+static int perf_evsel_browser_title(struct hist_browser *browser,
+                                    char *bf, size_t size);
 static void hist_browser__update_nr_entries(struct hist_browser *hb);
 
 static struct rb_node *hists__filter_entries(struct rb_node *nd,
@@ -568,6 +567,11 @@ static void ui_browser__warn_lost_events(struct ui_browser *browser)
                 "Or reduce the sampling frequency.");
 }
 
+static int hist_browser__title(struct hist_browser *browser, char *bf, size_t size)
+{
+        return browser->title ? browser->title(browser, bf, size) : 0;
+}
+
 int hist_browser__run(struct hist_browser *browser, const char *help)
 {
         int key;
@@ -578,7 +582,7 @@ int hist_browser__run(struct hist_browser *browser, const char *help)
         browser->b.entries = &browser->hists->entries;
         browser->b.nr_entries = hist_browser__nr_entries(browser);
 
-        hists__browser_title(browser->hists, hbt, title, sizeof(title));
+        hist_browser__title(browser, title, sizeof(title));
 
         if (ui_browser__show(&browser->b, title, "%s", help) < 0)
                 return -1;
@@ -604,8 +608,7 @@ int hist_browser__run(struct hist_browser *browser, const char *help)
                                 ui_browser__warn_lost_events(&browser->b);
                         }
 
-                        hists__browser_title(browser->hists,
-                                             hbt, title, sizeof(title));
+                        hist_browser__title(browser, title, sizeof(title));
                         ui_browser__show_title(&browser->b, title);
                         continue;
                 }
@@ -2054,6 +2057,7 @@ struct hist_browser *hist_browser__new(struct hists *hists,
                 browser->show_headers = symbol_conf.show_hist_headers;
                 browser->hbt = hbt;
                 browser->env = env;
+                browser->title = perf_evsel_browser_title;
         }
 
         return browser;
@@ -2080,10 +2084,11 @@ static inline bool is_report_browser(void *timer)
         return timer == NULL;
 }
 
-static int hists__browser_title(struct hists *hists,
-                                struct hist_browser_timer *hbt,
+static int perf_evsel_browser_title(struct hist_browser *browser,
                                 char *bf, size_t size)
 {
+        struct hist_browser_timer *hbt = browser->hbt;
+        struct hists *hists = browser->hists;
         char unit;
         int printed;
         const struct dso *dso = hists->dso_filter;
diff --git a/tools/perf/ui/browsers/hists.h b/tools/perf/ui/browsers/hists.h
index 57b7764800b7..cf9d04928ccc 100644
--- a/tools/perf/ui/browsers/hists.h
+++ b/tools/perf/ui/browsers/hists.h
@@ -18,6 +18,10 @@ struct hist_browser {
         u64                  nr_non_filtered_entries;
         u64                  nr_hierarchy_entries;
         u64                  nr_callchain_rows;
+
+        /* Get title string. */
+        int                  (*title)(struct hist_browser *browser,
+                             char *bf, size_t size);
 };
 
 struct hist_browser *hist_browser__new(struct hists *hists,