u-boot.git/tools/proftool.c, branch v2023.07

proftool: Remove unused variables in make_flame_tree

2023-03-22T19:22:48+00:00

With clang-15 we now get reported that in the make_flame_tree function,
neither the missing_count nor depth variables are used, only
incremenete/decremented. Remove these.

Signed-off-by: Tom Rini 
Reviewed-by: Simon Glass

trace: Provide a flamegraph that uses timing

2023-02-11T17:22:35+00:00

Add a second variant of the flame graph that shows records in terms of the
number of microseconds used by each call stack. This is a useful way of
seeing where time is going within the execution of U-Boot.

This requires a call stack that records the start time of each function,
as well as a way of subtracting all time consumed by child functions, so
that this time is not counted twice by the flamegraph. The time values in
the output are just for the function itself, not for its children.

Signed-off-by: Simon Glass

trace: Support output of a flamegraph

2023-02-11T17:22:35+00:00

It is useful to see how many times each function is called, particularly
in the context of its callers. A flamegraph is a way of showing this.

Support output in this format which can be used by the flamegraph.pl
script, to generate an SVG image for browsing.

Signed-off-by: Simon Glass

trace: Support output of funcgraph records

2023-02-11T17:22:35+00:00

Add support for writing ftrace records in the 'funcgraph' format, which
shows function entry and exit points as well as the time taken by each
function.

Signed-off-by: Simon Glass

trace: Use text_base from the trace header

2023-02-11T17:22:35+00:00

Use the information in the trace header instead of reading it from the
trace records. Add debugging to check that System.map and the trace header
agree on this value.

Signed-off-by: Simon Glass

trace: Drop use of objsection

2023-02-11T17:22:35+00:00

This feature was only partly implemented and serves no current purpose.
Drop it.

Signed-off-by: Simon Glass

trace: Update proftool to use new binary format

2023-02-11T17:22:35+00:00

The old text format is not much used anymore. Instead a new trace-cmd tool
has introduced a binary format for trace records.

Add support for generating this format. This involves removing the old
text format, adding various helpers for the new format and adjusting the
code to use an output file instead of stdout.

Signed-off-by: Simon Glass

trace: Rename prof to trace and improve comments

2023-02-11T17:22:35+00:00

The current use of 'profile' in some places is confusing. Update the code
to use the word 'trace' consistently. Change the flags to better match
their meaning and add some more comments.

Signed-off-by: Simon Glass

trace: Update trace-format generator for newer version

2023-01-18T18:49:13+00:00

This now includes flags and the layout has changed slightly in recent
versions of Linux. Update the generator accordingly.

Signed-off-by: Simon Glass

trace: Adjust flags in proftool

2023-01-18T18:49:13+00:00

The flags in this tool don't match the comments or help. Also the variable
names are quite confusing. Update them for consistency.

Signed-off-by: Simon Glass