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function_graph traces look like nested function calls, complete with braces denoting the start and end of functions. function-graph-fold.vim teaches vim how to fold these functions, to make it more convenient to browse them. To use, :source function-graph-fold.vim while viewing a function_graph trace, or use "view -S function-graph-fold.vim some-trace" to load it from the command-line together with a trace. You can then use the usual vim fold commands, such as "za", to open and close nested functions. While closed, a fold will show the total time taken for a call, as would normally appear on the line with the closing brace. Folded functions will not include finish_task_switch(), so folding should remain relatively sane even through a context switch. Note that this will almost certainly only work well with a single-CPU trace (e.g. trace-cmd report --cpu 1). It also takes some time to run (a few seconds for a large trace on my laptop). Nevertheless, I found it very handy to get an overview of a trace and then drill down on problematic calls. Signed-off-by: Josh Triplett <josh@joshtriplett.org> LKML-Reference: <20090806145701.GB7661@feather> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
43 lines
1.3 KiB
VimL
43 lines
1.3 KiB
VimL
" Enable folding for ftrace function_graph traces.
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"
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" To use, :source this file while viewing a function_graph trace, or use vim's
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" -S option to load from the command-line together with a trace. You can then
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" use the usual vim fold commands, such as "za", to open and close nested
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" functions. While closed, a fold will show the total time taken for a call,
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" as would normally appear on the line with the closing brace. Folded
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" functions will not include finish_task_switch(), so folding should remain
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" relatively sane even through a context switch.
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"
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" Note that this will almost certainly only work well with a
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" single-CPU trace (e.g. trace-cmd report --cpu 1).
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function! FunctionGraphFoldExpr(lnum)
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let line = getline(a:lnum)
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if line[-1:] == '{'
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if line =~ 'finish_task_switch() {$'
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return '>1'
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endif
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return 'a1'
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elseif line[-1:] == '}'
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return 's1'
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else
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return '='
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endif
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endfunction
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function! FunctionGraphFoldText()
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let s = split(getline(v:foldstart), '|', 1)
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if getline(v:foldend+1) =~ 'finish_task_switch() {$'
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let s[2] = ' task switch '
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else
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let e = split(getline(v:foldend), '|', 1)
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let s[2] = e[2]
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endif
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return join(s, '|')
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endfunction
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setlocal foldexpr=FunctionGraphFoldExpr(v:lnum)
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setlocal foldtext=FunctionGraphFoldText()
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setlocal foldcolumn=12
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setlocal foldmethod=expr
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