Documentation/trace/function-graph-fold.vim

   1 " Enable folding for ftrace function_graph traces.
   2 "
   3 " To use, :source this file while viewing a function_graph trace, or use vim's
   4 " -S option to load from the command-line together with a trace.  You can then
   5 " use the usual vim fold commands, such as "za", to open and close nested
   6 " functions.  While closed, a fold will show the total time taken for a call,
   7 " as would normally appear on the line with the closing brace.  Folded
   8 " functions will not include finish_task_switch(), so folding should remain
   9 " relatively sane even through a context switch.
  10 "
  11 " Note that this will almost certainly only work well with a
  12 " single-CPU trace (e.g. trace-cmd report --cpu 1).
  13
  14 function! FunctionGraphFoldExpr(lnum)
  15   let line = getline(a:lnum)
  16   if line[-1:] == '{'
  17     if line =~ 'finish_task_switch() {$'
  18       return '>1'
  19     endif
  20     return 'a1'
  21   elseif line[-1:] == '}'
  22     return 's1'
  23   else
  24     return '='
  25   endif
  26 endfunction
  27
  28 function! FunctionGraphFoldText()
  29   let s = split(getline(v:foldstart), '|', 1)
  30   if getline(v:foldend+1) =~ 'finish_task_switch() {$'
  31     let s[2] = ' task switch  '
  32   else
  33     let e = split(getline(v:foldend), '|', 1)
  34     let s[2] = e[2]
  35   endif
  36   return join(s, '|')
  37 endfunction
  38
  39 setlocal foldexpr=FunctionGraphFoldExpr(v:lnum)
  40 setlocal foldtext=FunctionGraphFoldText()
  41 setlocal foldcolumn=12
  42 setlocal foldmethod=expr