perf_counter tools: include PID in perf-report output, tweak user/kernel printut

It's handier than an <unknown> entry.
Also replace the kernel/user column with a more compact version:

  0.52              cc1  [k]  page_fault
  0.57               :0  [k]   _spin_lock
  0.59            :7506  [.]  <unknown>
  0.69               as  [.]  /usr/bin/as: <unknown>
  0.76              cc1  [.]  /lib64/libc-2.8.so: _int_free
  0.92              cc1  [k]  clear_page_c
  1.00            :7465  [.]  <unknown>
  1.43              cc1  [.]  /lib64/libc-2.8.so: memset
  1.86              cc1  [.]  /lib64/libc-2.8.so: _int_malloc
 70.33              cc1  [.]  /usr/libexec/gcc/x86_64-redhat-linux/4.3.2/cc1: <unknown>

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 12 insertions, 5 deletions

diff --git a/Documentation/perf_counter/perf-report.cc b/Documentation/perf_counter/perf-report.cc
index 09da0ba482cd..1727317352bf 100644
--- a/Documentation/perf_counter/perf-report.cc
+++ b/Documentation/perf_counter/perf-report.cc
@@ -277,10 +277,17 @@ static std::multimap<int, std::string> rev_hist;
 
 static std::string resolve_comm(int pid)
 {
-        std::string comm = "<unknown>";
+        std::string comm;
+
         std::map<int, std::string>::const_iterator ci = comms.find(pid);
-        if (ci != comms.end())
+        if (ci != comms.end()) {
                 comm = ci->second;
+        } else {
+                char pid_str[30];
+
+                sprintf(pid_str, ":%d", pid);
+                comm = pid_str;
+        }
 
         return comm;
 }
@@ -422,13 +429,13 @@ more:
                 char output[1024];
 
                 if (event->header.misc & PERF_EVENT_MISC_KERNEL) {
-                        level = "[kernel]";
+                        level = " [k] ";
                         sym = resolve_kernel_symbol(event->ip.ip);
                 } else if (event->header.misc & PERF_EVENT_MISC_USER) {
-                        level = "[ user ]";
+                        level = " [.] ";
                         sym = resolve_user_symbol(event->ip.pid, event->ip.ip);
                 } else {
-                        level = "[  hv  ]";
+                        level = " [H] ";
                 }
                 comm = resolve_comm(event->ip.pid);