Add bitesize tool
diff --git a/tools/bitesize_example.txt b/tools/bitesize_example.txt
new file mode 100644
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+++ b/tools/bitesize_example.txt
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+Example of BCC tool bitesize.py
+
+The aim of this tool is to show I/O distribution for requested block sizes, by process name.
+
+# ./bitesize.py
+Tracing... Hit Ctrl-C to end.
+^C
+
+Process Name: = 'kworker/u128:1'
+ Kbytes : count distribution
+ 0 -> 1 : 1 |******************** |
+ 2 -> 3 : 0 | |
+ 4 -> 7 : 2 |****************************************|
+
+Process Name: = 'bitesize.py'
+ Kbytes : count distribution
+ 0 -> 1 : 0 | |
+ 2 -> 3 : 0 | |
+ 4 -> 7 : 0 | |
+ 8 -> 15 : 0 | |
+ 16 -> 31 : 0 | |
+ 32 -> 63 : 0 | |
+ 64 -> 127 : 0 | |
+ 128 -> 255 : 1 |****************************************|
+
+Process Name: = 'dd'
+ Kbytes : count distribution
+ 0 -> 1 : 3 | |
+ 2 -> 3 : 0 | |
+ 4 -> 7 : 6 | |
+ 8 -> 15 : 0 | |
+ 16 -> 31 : 1 | |
+ 32 -> 63 : 1 | |
+ 64 -> 127 : 0 | |
+ 128 -> 255 : 0 | |
+ 256 -> 511 : 1 | |
+ 512 -> 1023 : 0 | |
+ 1024 -> 2047 : 488 |****************************************|
+
+Process Name: = 'jbd2/dm-1-8'
+ Kbytes : count distribution
+ 0 -> 1 : 0 | |
+ 2 -> 3 : 0 | |
+ 4 -> 7 : 1 |****************************************|
+
+Process Name: = 'cat'
+ Kbytes : count distribution
+ 0 -> 1 : 1 | |
+ 2 -> 3 : 0 | |
+ 4 -> 7 : 0 | |
+ 8 -> 15 : 0 | |
+ 16 -> 31 : 0 | |
+ 32 -> 63 : 1 | |
+ 64 -> 127 : 0 | |
+ 128 -> 255 : 0 | |
+ 256 -> 511 : 1924 |****************************************|
+
+Process Name: = 'ntpd'
+ Kbytes : count distribution
+ 0 -> 1 : 0 | |
+ 2 -> 3 : 0 | |
+ 4 -> 7 : 104 |****************************************|
+
+Process Name: = 'vmtoolsd'
+ Kbytes : count distribution
+ 0 -> 1 : 0 | |
+ 2 -> 3 : 0 | |
+ 4 -> 7 : 1 |****************************************|
+
+Process Name: = 'bash'
+ Kbytes : count distribution
+ 0 -> 1 : 0 | |
+ 2 -> 3 : 0 | |
+ 4 -> 7 : 0 | |
+ 8 -> 15 : 0 | |
+ 16 -> 31 : 2 |****************************************|
+
+Process Name: = 'jbd2/sdb-8'
+ Kbytes : count distribution
+ 0 -> 1 : 0 | |
+ 2 -> 3 : 0 | |
+ 4 -> 7 : 1 |****************************************|
+ 8 -> 15 : 0 | |
+ 16 -> 31 : 0 | |
+ 32 -> 63 : 1 |****************************************|
+
+We can see from above that there was a dd command being run which generated 488 IOPS between 1MB and 2MB, we can also see the
+cat command generating 1924 IOPS between 256Kb and 512Kb.
+
+
+See also systemtap version:
+https://github.com/brendangregg/systemtap-lwtools/blob/master/disk/bitesize-nd.stp