target: Correct profiling calculation 07/1607/3
authorHsiangkai Wang <hsiangkai@gmail.com>
Fri, 30 Aug 2013 05:35:08 +0000 (13:35 +0800)
committerSpencer Oliver <spen@spen-soft.co.uk>
Fri, 13 Sep 2013 19:36:43 +0000 (19:36 +0000)
commitd4d62ea8a80502f85f1ca92b231da56ef3b84baf
treee2e661a2d52da6d4578a65e2e58dff66eff0410e
parenta4bacdcb84f0d0cbd19a8db3833f65445c47904c
target: Correct profiling calculation

1. high_pc should be (maximum sample + 1) (Refer to gprof source code)
2. bucket index should be

     sample offset
    --------------- x (number of bucket)
 sample range

For example, if minimum sample is 0 and maximum sample is 5
and the number of bucket is 3.

a = sampled_address - 0
b = 3
c = 6
(a, b, c refer to source code variables)

sampled_address = 0, => a = 0, => bucket_index = 0
sampled_address = 1, => a = 1, => bucket_index = 0
sampled_address = 2, => a = 2, => bucket_index = 1
sampled_address = 3, => a = 3, => bucket_index = 1
sampled_address = 4, => a = 4, => bucket_index = 2
sampled_address = 5, => a = 5, => bucket_index = 2

Change-Id: Ia9fa0e4d9c7183e3e9d7ceaf73e63729f07aa2ce
Signed-off-by: Hsiangkai Wang <hsiangkai@gmail.com>
Reviewed-on: http://openocd.zylin.com/1607
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
src/target/target.c