perf c2c report: Add support to manage symbol name length

The width of symbol and source line entries could get really long
and not convenient to display. Adding support to display only
patrt of such strings and possibility to switch to full length
by uing --full-symbols option or 's' key in TUI browser.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Joe Mario <jmario@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-yxf5hfteyfaoi8xrgczqtyha@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 32 insertions, 1 deletions

diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
index b3e48e42e825..4645461bd997 100644
--- a/tools/perf/builtin-c2c.c
+++ b/tools/perf/builtin-c2c.c
@@ -62,6 +62,7 @@ struct perf_c2c {
         bool                     show_src;
         bool                     use_stdio;
         bool                     stats_only;
+        bool                     symbol_full;
 
         /* HITM shared clines stats */
         struct c2c_stats        hitm_stats;
@@ -336,6 +337,21 @@ struct c2c_fmt {
         struct c2c_dimension    *dim;
 };
 
+#define SYMBOL_WIDTH 30
+
+static struct c2c_dimension dim_symbol;
+static struct c2c_dimension dim_srcline;
+
+static int symbol_width(struct hists *hists, struct sort_entry *se)
+{
+        int width = hists__col_len(hists, se->se_width_idx);
+
+        if (!c2c.symbol_full)
+                width = MIN(width, SYMBOL_WIDTH);
+
+        return width;
+}
+
 static int c2c_width(struct perf_hpp_fmt *fmt,
                      struct perf_hpp *hpp __maybe_unused,
                      struct hists *hists __maybe_unused)
@@ -346,6 +362,9 @@ static int c2c_width(struct perf_hpp_fmt *fmt,
         c2c_fmt = container_of(fmt, struct c2c_fmt, fmt);
         dim = c2c_fmt->dim;
 
+        if (dim == &dim_symbol || dim == &dim_srcline)
+                return symbol_width(hists, dim->se);
+
         return dim->se ? hists__col_len(hists, dim->se->se_width_idx) :
                          c2c_fmt->dim->width;
 }
@@ -1563,9 +1582,13 @@ static int c2c_se_entry(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
         struct c2c_dimension *dim = c2c_fmt->dim;
         size_t len = fmt->user_len;
 
-        if (!len)
+        if (!len) {
                 len = hists__col_len(he->hists, dim->se->se_width_idx);
 
+                if (dim == &dim_symbol || dim == &dim_srcline)
+                        len = symbol_width(he->hists, dim->se);
+        }
+
         return dim->se->se_snprintf(he, hpp->buf, hpp->size, len);
 }
 
@@ -2159,6 +2182,9 @@ static int perf_c2c__browse_cacheline(struct hist_entry *he)
         struct hist_browser *browser;
         int key = -1;
 
+        /* Display compact version first. */
+        c2c.symbol_full = false;
+
         c2c_he = container_of(he, struct c2c_hist_entry, he);
         c2c_hists = c2c_he->hists;
 
@@ -2178,6 +2204,9 @@ static int perf_c2c__browse_cacheline(struct hist_entry *he)
                 key = hist_browser__run(browser, "help");
 
                 switch (key) {
+                case 's':
+                        c2c.symbol_full = !c2c.symbol_full;
+                        break;
                 case 'q':
                         goto out;
                 default:
@@ -2449,6 +2478,8 @@ static int perf_c2c__report(int argc, const char **argv)
 #endif
         OPT_BOOLEAN(0, "stats", &c2c.stats_only,
                     "Use the stdio interface"),
+        OPT_BOOLEAN(0, "full-symbols", &c2c.symbol_full,
+                    "Display full length of symbols"),
         OPT_CALLBACK_DEFAULT('g', "call-graph", &callchain_param,
                              "print_type,threshold[,print_limit],order,sort_key[,branch],value",
                              callchain_help, &parse_callchain_opt,