Get more informative output from cbmem.py

This is a cosmetic change which formats timestamp information
retrieved by cbmem.py.

Instead of printing timestamps in a single line, print them one per
line and add time (in us) elapsed since the previous timestamp.

     time base 4149594, total entries 18
     1:56,928
     2:58,851  (1,923)
     3:175,230  (116,378)
     4:175,340  (109)
     8:177,199  (1,859)
     9:214,368  (37,168)
     10:214,450  (81)
     30:214,462  (11)
     40:215,205  (743)
     50:217,180  (1,974)
     60:217,312  (132)
     70:436,984  (219,671)
     75:436,993  (8)
     80:441,424  (4,431)
     90:442,487  (1,062)
     99:553,777  (111,289)
     1000:556,513  (2,736)
     1100:824,621  (268,107)

Change-Id: I0d25cafe766c10377017697e6b206276e1a92992
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: http://review.coreboot.org/1716
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/util/cbmem/cbmem.py b/util/cbmem/cbmem.py
index 839393bba4..70ccc00afc 100755
--- a/util/cbmem/cbmem.py
+++ b/util/cbmem/cbmem.py
@@ -136,10 +136,16 @@ def process_timers(base):
     print('\ntime base %d, total entries %d' % (header.base_time, header.entr))
     clock_freq = get_cpu_freq()
     base = base + header.struct_len
+    prev_time = 0
     for i in range(header.entr):
         timestamp = TimestampEntry(base)
         print '%d:%s ' % (timestamp.timer_id,
             normalize_timer(timestamp.timer_value, clock_freq)),
+        if prev_time:
+            print '(%s)' % normalize_timer(
+                timestamp.timer_value - prev_time, clock_freq),
+        prev_time = timestamp.timer_value
+        print
         base = base + timestamp.struct_len
     print