bitesize nits

tools/bitesize.py

@@ -4,8 +4,8 @@
 #               For Linux, uses BCC, eBPF. See .c file.
 #
 # USAGE: bitesize
-# Ctrl-C will print the partially gathered histogram then exit.
 #
+# Ctrl-C will print the partially gathered histogram then exit.
 #
 # Copyright (c) 2016 Allan McAleavy
 # Licensed under the Apache License, Version 2.0 (the "License")
@@ -46,7 +46,7 @@ int do_count (struct pt_regs *ctx, struct request *req)
     struct val_t *valp;
 
     valp = commbyreq.lookup(&req);
-    if ( valp ==  0) {
+    if (valp ==  0) {
        return 0;
     }
 
@@ -55,7 +55,7 @@ int do_count (struct pt_regs *ctx, struct request *req)
         bpf_probe_read(&key.name, sizeof(key.name),valp->name);
         dist.increment(key);
     }
-       return 0;
+    return 0;
 }
 """
 
@@ -72,4 +72,4 @@ dist = b.get_table("dist")
 try:
     sleep(99999999)
 except KeyboardInterrupt:
-    dist.print_log2_hist("Kbytes", "Process Name:")
+    dist.print_log2_hist("Kbytes", "Process Name")

tools/bitesize_example.txt

-Example of BCC tool bitesize.py
+Examples of bitesize.py, the Linux bcc/eBPF version.
+
 
 The aim of this tool is to show I/O distribution for requested block sizes, by process name.
 
@@ -6,13 +7,13 @@ The aim of this tool is to show I/O distribution for requested block sizes, by p
 Tracing... Hit Ctrl-C to end.
 ^C
 
-Process Name: = 'kworker/u128:1'
+Process Name = 'kworker/u128:1'
      Kbytes              : count     distribution
          0 -> 1          : 1        |********************                    |
          2 -> 3          : 0        |                                        |
          4 -> 7          : 2        |****************************************|
 
-Process Name: = 'bitesize.py'
+Process Name = 'bitesize.py'
      Kbytes              : count     distribution
          0 -> 1          : 0        |                                        |
          2 -> 3          : 0        |                                        |
@@ -23,7 +24,7 @@ Process Name: = 'bitesize.py'
         64 -> 127        : 0        |                                        |
        128 -> 255        : 1        |****************************************|
 
-Process Name: = 'dd'
+Process Name = 'dd'
      Kbytes              : count     distribution
          0 -> 1          : 3        |                                        |
          2 -> 3          : 0        |                                        |
@@ -37,13 +38,13 @@ Process Name: = 'dd'
        512 -> 1023       : 0        |                                        |
       1024 -> 2047       : 488      |****************************************|
 
-Process Name: = 'jbd2/dm-1-8'
+Process Name = 'jbd2/dm-1-8'
      Kbytes              : count     distribution
          0 -> 1          : 0        |                                        |
          2 -> 3          : 0        |                                        |
          4 -> 7          : 1        |****************************************|
 
-Process Name: = 'cat'
+Process Name = 'cat'
      Kbytes              : count     distribution
          0 -> 1          : 1        |                                        |
          2 -> 3          : 0        |                                        |
@@ -55,19 +56,19 @@ Process Name: = 'cat'
        128 -> 255        : 0        |                                        |
        256 -> 511        : 1924     |****************************************|
 
-Process Name: = 'ntpd'
+Process Name = 'ntpd'
      Kbytes              : count     distribution
          0 -> 1          : 0        |                                        |
          2 -> 3          : 0        |                                        |
          4 -> 7          : 104      |****************************************|
 
-Process Name: = 'vmtoolsd'
+Process Name = 'vmtoolsd'
      Kbytes              : count     distribution
          0 -> 1          : 0        |                                        |
          2 -> 3          : 0        |                                        |
          4 -> 7          : 1        |****************************************|
 
-Process Name: = 'bash'
+Process Name = 'bash'
      Kbytes              : count     distribution
          0 -> 1          : 0        |                                        |
          2 -> 3          : 0        |                                        |
@@ -75,7 +76,7 @@ Process Name: = 'bash'
          8 -> 15         : 0        |                                        |
         16 -> 31         : 2        |****************************************|
 
-Process Name: = 'jbd2/sdb-8'
+Process Name = 'jbd2/sdb-8'
      Kbytes              : count     distribution
          0 -> 1          : 0        |                                        |
          2 -> 3          : 0        |                                        |
@@ -86,7 +87,3 @@ Process Name: = 'jbd2/sdb-8'
 
 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