From: Josh Triplett <josh@joshtriplett.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>
Subject: [PATCH] ftrace: Add vim script to enable folding for function_graph traces
Date: Thu, 6 Aug 2009 07:57:01 -0700 [thread overview]
Message-ID: <20090806145701.GB7661@feather> (raw)
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>
---
Documentation/trace/function-graph-fold.vim | 42 +++++++++++++++++++++++++++
1 files changed, 42 insertions(+), 0 deletions(-)
create mode 100644 Documentation/trace/function-graph-fold.vim
diff --git a/Documentation/trace/function-graph-fold.vim b/Documentation/trace/function-graph-fold.vim
new file mode 100644
index 0000000..0544b50
--- /dev/null
+++ b/Documentation/trace/function-graph-fold.vim
@@ -0,0 +1,42 @@
+" Enable folding for ftrace function_graph traces.
+"
+" To use, :source this file while viewing a function_graph trace, or use vim's
+" -S option to load 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).
+
+function! FunctionGraphFoldExpr(lnum)
+ let line = getline(a:lnum)
+ if line[-1:] == '{'
+ if line =~ 'finish_task_switch() {$'
+ return '>1'
+ endif
+ return 'a1'
+ elseif line[-1:] == '}'
+ return 's1'
+ else
+ return '='
+ endif
+endfunction
+
+function! FunctionGraphFoldText()
+ let s = split(getline(v:foldstart), '|', 1)
+ if getline(v:foldend+1) =~ 'finish_task_switch() {$'
+ let s[2] = ' task switch '
+ else
+ let e = split(getline(v:foldend), '|', 1)
+ let s[2] = e[2]
+ endif
+ return join(s, '|')
+endfunction
+
+setlocal foldexpr=FunctionGraphFoldExpr(v:lnum)
+setlocal foldtext=FunctionGraphFoldText()
+setlocal foldcolumn=12
+setlocal foldmethod=expr
--
1.6.3.3
next reply other threads:[~2009-08-06 15:22 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-06 14:57 Josh Triplett [this message]
2009-08-07 0:04 ` [PATCH] ftrace: Add vim script to enable folding for function_graph traces Steven Rostedt
2009-08-26 7:22 ` [tip:tracing/core] tracing: " tip-bot for Josh Triplett
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