(CommandList
  children: [
    (Assignment
      keyword: Assign_None
      pairs: [
        (assign_pair
          lhs: (LhsName name:tracing)
          op: Equal
          rhs: {(/sys/kernel/debug/tracing)}
          spids: [166]
        )
      ]
      spids: [166]
    )
    (Sentence
      child: 
        (Assignment
          keyword: Assign_None
          pairs: [(assign_pair lhs:(LhsName name:interval) op:Equal rhs:{(1)} spids:[169])]
          spids: [169]
        )
      terminator: <Op_Semi ';'>
    )
    (Sentence
      child: 
        (Assignment
          keyword: Assign_None
          pairs: [(assign_pair lhs:(LhsName name:opt_timestamp) op:Equal rhs:{(0)} spids:[173])]
          spids: [173]
        )
      terminator: <Op_Semi ';'>
    )
    (Assignment
      keyword: Assign_None
      pairs: [(assign_pair lhs:(LhsName name:opt_debug) op:Equal rhs:{(0)} spids:[177])]
      spids: [177]
    )
    (C {(trap)} {(SQ <'quit=1'>)} {(INT)} {(QUIT)} {(TERM)} {(PIPE)} {(HUP)})
    (FuncDef
      name: usage
      body: 
        (BraceGroup
          children: [
            (SimpleCommand
              words: [{(cat)}]
              redirects: [
                (HereDoc
                  op_id: Redir_DLessDash
                  fd: 16777215
                  body: 
                    {
                      (DQ ('USAGE: cachestat [-Dht] [interval]\n') 
                        ('                 -D              # print debug counters\n') ('                 -h              # this usage message\n') 
                        ('                 -t              # include timestamp\n') ('                 interval        # output interval in secs (default 1)\n') ('  eg,\n') 
                        ('       cachestat                 # show stats every second\n') ('       cachestat 5               # show stats every 5 seconds\n') ('\n') 
                        ('See the man page and example file for more info.\n')
                      )
                    }
                  do_expansion: True
                  here_end: END
                  was_filled: T
                  spids: [209]
                )
                (Redir op_id:Redir_GreatAnd fd:16777215 arg_word:{(2)} spids:[212])
              ]
            )
            (ControlFlow token:<ControlFlow_Exit exit>)
          ]
          spids: [204]
        )
      spids: [200 203]
    )
    (FuncDef
      name: warn
      body: 
        (BraceGroup
          children: [
            (If
              arms: [
                (if_arm
                  cond: [
                    (Sentence
                      child: (Pipeline children:[(C {(eval)} {(DQ ($ VSub_At '$@'))})] negated:T)
                      terminator: <Op_Semi ';'>
                    )
                  ]
                  action: [
                    (SimpleCommand
                      words: [
                        {(echo)}
                        {
                          (DQ ('WARNING: command failed ') 
                            (EscapedLiteralPart
                              token: <Lit_EscapedChar '\\"'>
                            ) ($ VSub_At '$@') (EscapedLiteralPart token:<Lit_EscapedChar '\\"'>)
                          )
                        }
                      ]
                      redirects: [(Redir op_id:Redir_GreatAnd fd:16777215 arg_word:{(2)} spids:[255])]
                    )
                  ]
                  spids: [16777215 250]
                )
              ]
              spids: [16777215 266]
            )
          ]
          spids: [236]
        )
      spids: [232 235]
    )
    (FuncDef
      name: die
      body: 
        (BraceGroup
          children: [
            (SimpleCommand
              words: [{(echo)} {(DQ ($ VSub_At '$@'))}]
              redirects: [(Redir op_id:Redir_GreatAnd fd:16777215 arg_word:{(2)} spids:[280])]
            )
            (ControlFlow token:<ControlFlow_Exit exit> arg_word:{(1)})
          ]
          spids: [275]
        )
      spids: [271 274]
    )
    (While
      cond: [(C {(getopts)} {(Dht)} {(opt)})]
      body: 
        (DoGroup
          children: [
            (Case
              to_match: {($ VSub_Name '$opt')}
              arms: [
                (case_arm
                  pat_list: [{(D)}]
                  action: [
                    (Assignment
                      keyword: Assign_None
                      pairs: [
                        (assign_pair
                          lhs: (LhsName name:opt_debug)
                          op: Equal
                          rhs: {(1)}
                          spids: [319]
                        )
                      ]
                      spids: [319]
                    )
                  ]
                  spids: [316 317 322 16777215]
                )
                (case_arm
                  pat_list: [{(t)}]
                  action: [
                    (Assignment
                      keyword: Assign_None
                      pairs: [
                        (assign_pair
                          lhs: (LhsName name:opt_timestamp)
                          op: Equal
                          rhs: {(1)}
                          spids: [328]
                        )
                      ]
                      spids: [328]
                    )
                  ]
                  spids: [325 326 331 16777215]
                )
                (case_arm
                  pat_list: [{(h)} {(Lit_Other '?')}]
                  action: [(C {(usage)})]
                  spids: [334 337 341 16777215]
                )
              ]
              spids: [309 313 344]
            )
          ]
          spids: [306 346]
        )
    )
    (C {(shift)} 
      {
        (ArithSubPart
          anode: 
            (ArithBinary
              op_id: Arith_Minus
              left: (ArithWord w:{($ VSub_Name '$OPTIND')})
              right: (ArithWord w:{(Lit_Digits 1)})
            )
          spids: [350 359]
        )
      }
    )
    (If
      arms: [
        (if_arm
          cond: [
            (Sentence
              child: (DParen child:(ArithWord w:{($ VSub_Pound '$#')}))
              terminator: <Op_Semi ';'>
            )
          ]
          action: [
            (Assignment
              keyword: Assign_None
              pairs: [
                (assign_pair
                  lhs: (LhsName name:interval)
                  op: Equal
                  rhs: {($ VSub_Number '$1')}
                  spids: [378]
                )
              ]
              spids: [378]
            )
          ]
          spids: [16777215 375]
        )
      ]
      spids: [16777215 381]
    )
    (C {(echo)} 
      {(DQ ('Counting cache functions... Output every ') ($ VSub_Name '$interval') (' seconds.'))}
    )
    (AndOr
      ops: [Op_DPipe]
      children: [
        (C {(cd)} {($ VSub_Name '$tracing')})
        (C {(die)} 
          {
            (DQ ('ERROR: accessing tracing. Root user? Kernel has FTRACE?\n') 
              ('    debugfs mounted? (mount -t debugfs debugfs /sys/kernel/debug)')
            )
          }
        )
      ]
    )
    (C {(sysctl)} {(-q)} {(kernel.ftrace_enabled) (Lit_Other '=') (1)})
    (AndOr
      ops: [Op_DPipe]
      children: [
        (SimpleCommand
          words: [
            {(printf)}
            {
              (DQ (mark_page_accessed) (Lit_Other '\\') (nmark_buffer_dirty) (Lit_Other '\\') 
                (nadd_to_page_cache_lru) (Lit_Other '\\') (naccount_page_dirtied) (Lit_Other '\\') (n)
              )
            }
          ]
          redirects: [
            (Redir
              op_id: Redir_Great
              fd: 16777215
              arg_word: {(set_ftrace_filter)}
              spids: [437]
            )
          ]
        )
        (C {(die)} {(DQ ('ERROR: tracing these four kernel functions: mark_page_accessed,'))} 
          {
            (DQ 
              (
'mark_buffer_dirty, add_to_page_cache_lru and account_page_dirtied (unknown kernel version?). Exiting.'
              )
            )
          }
        )
      ]
    )
    (C {(warn)} {(DQ ('echo nop > current_tracer'))})
    (If
      arms: [
        (if_arm
          cond: [
            (Sentence
              child: 
                (Pipeline
                  children: [
                    (SimpleCommand
                      words: [{(echo)} {(1)}]
                      redirects: [
                        (Redir
                          op_id: Redir_Great
                          fd: 16777215
                          arg_word: {(function_profile_enabled)}
                          spids: [470]
                        )
                      ]
                    )
                  ]
                  negated: T
                )
              terminator: <Op_Semi ';'>
            )
          ]
          action: [
            (SimpleCommand
              words: [{(echo)}]
              redirects: [
                (Redir
                  op_id: Redir_Great
                  fd: 16777215
                  arg_word: {(set_ftrace_filter)}
                  spids: [480]
                )
              ]
            )
            (C {(die)} 
              {(DQ ('ERROR: enabling function profiling. Have CONFIG_FUNCTION_PROFILER? Exiting.'))}
            )
          ]
          spids: [16777215 475]
        )
      ]
      spids: [16777215 491]
    )
    (AndOr
      ops: [Op_DAmp]
      children: [
        (DParen child:(ArithVarRef name:opt_timestamp))
        (C {(printf)} {(DQ ('%-8s '))} {(TIME)})
      ]
    )
    (C {(printf)} {(DQ ('%8s %8s %8s %8s %12s %10s'))} {(HITS)} {(MISSES)} {(DIRTIES)} {(RATIO)} 
      {(DQ (BUFFERS_MB))} {(DQ (CACHE_MB))}
    )
    (AndOr
      ops: [Op_DAmp]
      children: [(DParen child:(ArithVarRef name:opt_debug)) (C {(printf)} {(DQ ('  DEBUG'))})]
    )
    (C {(echo)})
    (Sentence
      child: 
        (Assignment
          keyword: Assign_None
          pairs: [(assign_pair lhs:(LhsName name:quit) op:Equal rhs:{(0)} spids:[554])]
          spids: [554]
        )
      terminator: <Op_Semi ';'>
    )
    (Assignment
      keyword: Assign_None
      pairs: [(assign_pair lhs:(LhsName name:secs) op:Equal rhs:{(0)} spids:[558])]
      spids: [558]
    )
    (While
      cond: [
        (Sentence
          child: 
            (DParen
              child: 
                (ArithBinary
                  op_id: Arith_DAmp
                  left: (ArithUnary op_id:Arith_Bang child:(ArithVarRef name:quit))
                  right: 
                    (ArithBinary
                      op_id: Arith_DPipe
                      left: (ArithUnary op_id:Arith_Bang child:(ArithVarRef name:opt_duration))
                      right: 
                        (ArithBinary
                          op_id: Arith_Less
                          left: (ArithVarRef name:secs)
                          right: (ArithVarRef name:duration)
                        )
                    )
                )
            )
          terminator: <Op_Semi ';'>
        )
      ]
      body: 
        (DoGroup
          children: [
            (DParen
              child: 
                (BinaryAssign
                  op_id: Arith_PlusEqual
                  left: (LhsName name:secs)
                  right: (ArithVarRef name:interval)
                )
            )
            (SimpleCommand
              words: [{(echo)} {(0)}]
              redirects: [
                (Redir
                  op_id: Redir_Great
                  fd: 16777215
                  arg_word: {(function_profile_enabled)}
                  spids: [606]
                )
              ]
            )
            (SimpleCommand
              words: [{(echo)} {(1)}]
              redirects: [
                (Redir
                  op_id: Redir_Great
                  fd: 16777215
                  arg_word: {(function_profile_enabled)}
                  spids: [615]
                )
              ]
            )
            (C {(sleep)} {($ VSub_Name '$interval')})
            (AndOr
              ops: [Op_DAmp]
              children: [
                (DParen child:(ArithVarRef name:opt_timestamp))
                (C {(printf)} {(DQ ('%(%H:%M:%S)T '))} {(-1)})
              ]
            )
            (Pipeline
              children: [
                (C {(cat)} {(/proc/meminfo)} {(trace_stat/function) (Lit_Other '*')})
                (C {(awk)} {(-v)} {(Lit_VarLike 'debug=') ($ VSub_Name '$opt_debug')} 
                  {
                    (SQ <'\n'> <'\t# match meminfo stats:\n'> 
                      <'\t$1 == "Buffers:" && $3 == "kB" { buffers_mb = $2 / 1024 }\n'> <'\t$1 == "Cached:" && $3 == "kB" { cached_mb = $2 / 1024 }\n'> 
                      <'\t# identify and save trace counts:\n'> <'\t$2 ~ /[0-9]/ && $3 != "kB" { a[$1] += $2 }\n'> <'\tEND {\n'> 
                      <'\t\tmpa = a["mark_page_accessed"]\n'> <'\t\tmbd = a["mark_buffer_dirty"]\n'> <'\t\tapcl = a["add_to_page_cache_lru"]\n'> 
                      <'\t\tapd = a["account_page_dirtied"]\n'> <'\n'> <'\t\ttotal = mpa - mbd\n'> <'\t\tmisses = apcl - apd\n'> <'\t\tif (misses < 0)\n'> 
                      <'\t\t\tmisses = 0\n'> <'\t\thits = total - misses\n'> <'\n'> <'\t\tratio = 100 * hits / total\n'> 
                      <'\t\tprintf "%8d %8d %8d %7.1f%% %12.0f %10.0f", hits, misses, mbd,\n'> <'\t\t    ratio, buffers_mb, cached_mb\n'> <'\t\tif (debug)\n'> 
                      <'\t\t\tprintf "  (%d %d %d %d)", mpa, mbd, apcl, apd\n'> <'\t\tprintf "\\n"\n'> <'\t}'>
                    )
                  }
                )
              ]
              negated: F
            )
          ]
          spids: [587 693]
        )
    )
    (SimpleCommand
      words: [{(echo)}]
      redirects: [(Redir op_id:Redir_Great fd:2 arg_word:{(/dev/null)} spids:[701])]
    )
    (SimpleCommand
      words: [{(echo)} {(DQ ('Ending tracing...'))}]
      redirects: [(Redir op_id:Redir_Great fd:2 arg_word:{(/dev/null)} spids:[710])]
    )
    (C {(warn)} {(DQ ('echo 0 > function_profile_enabled'))})
    (C {(warn)} {(DQ ('echo > set_ftrace_filter'))})
  ]
)