perf report: Enable the runtime switching of perf data file

This is for tui browser only. This patch will check the returned key of
tui hists browser, if it's K_SWITH_INPUT_DATA, then recreate a session
for the new selected data file.

V2: Move the setup_brower() before the "repeat" jump point.

Signed-off-by: Feng Tang <feng.tang@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1359873501-24541-2-git-send-email-feng.tang@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 27 insertions, 11 deletions

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 0d221870561a..91555d4885f4 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -468,9 +468,17 @@ static int __cmd_report(struct perf_report *rep)
 
         if (use_browser > 0) {
                 if (use_browser == 1) {
-                        perf_evlist__tui_browse_hists(session->evlist, help,
-                                                      NULL,
-                                                      &session->header.env);
+                        ret = perf_evlist__tui_browse_hists(session->evlist,
+                                                        help,
+                                                        NULL,
+                                                        &session->header.env);
+                        /*
+                         * Usually "ret" is the last pressed key, and we only
+                         * care if the key notifies us to switch data file.
+                         */
+                        if (ret != K_SWITCH_INPUT_DATA)
+                                ret = 0;
+
                 } else if (use_browser == 2) {
                         perf_evlist__gtk_browse_hists(session->evlist, help,
                                                       NULL);
@@ -708,6 +716,16 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
                 else
                         input_name = "perf.data";
         }
+
+        if (strcmp(input_name, "-") != 0)
+                setup_browser(true);
+        else {
+                use_browser = 0;
+                perf_hpp__column_enable(PERF_HPP__OVERHEAD);
+                perf_hpp__init();
+        }
+
+repeat:
         session = perf_session__new(input_name, O_RDONLY,
                                     report.force, false, &report.tool);
         if (session == NULL)
@@ -733,14 +751,6 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
 
         }
 
-        if (strcmp(input_name, "-") != 0)
-                setup_browser(true);
-        else {
-                use_browser = 0;
-                perf_hpp__column_enable(PERF_HPP__OVERHEAD);
-                perf_hpp__init();
-        }
-
         setup_sorting(report_usage, options);
 
         /*
@@ -809,6 +819,12 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
         }
 
         ret = __cmd_report(&report);
+        if (ret == K_SWITCH_INPUT_DATA) {
+                perf_session__delete(session);
+                goto repeat;
+        } else
+                ret = 0;
+
 error:
         perf_session__delete(session);
         return ret;