New implementation, adding a compression to trace file. A basic infrastructure
for compression support is added into the trace-cmd library. The zlib is used
for compression, but more libraries and algorithms can be added. Trace data is
commpressed and part of the trace file metadata:
- ftrace events format
- format of recorded events
- information about the mapping of function addresses to the function names
- trace_printk() format strings
- information of the mapping a PID to a process name
- options
Note: not all trace-cmd commands are tested with these changes. These are
verified to work with compressed trace files:
trace-cmd record
trace-cmd report
trace-cmd dump
trace-cmd agent
trace-cmd profile
trace-cmd split
trace-cmd convert
Todo list, in order to have complete trace file compression:
- Add support for more compression libraries.
- Test all trace-cmd commands with trace file v7.
v6 changes:
- Documentation upadate.
- Bug fixes.
- Coding style fixes.
v5 changes:
- Comress the latency trace data.
- Add new "trace-cmd convert" subcommand.
- Fixed bug with empty CPUs in the trace file.
- A lot of minor bug fixes.
v4 changes:
- Tested and fixed profile and split subcommands with compression files.
- Bug fixes.
v3 changes:
- Compress the trace data.
- Added documentation to all compression APIs.
- A few minor fixes.
v2 changes:
- Refactored compression APIs.
- Moved the trace buffers description out of the trace options section.
- Added compression of "options" section of the trace file.
- Updated "trace-cmd list" to show available compression algorithms.
- Tested with host-guest tracing.
- Merged with the patchset that bumps the trace file version.
Tzvetomir Stoyanov (VMware) (45):
trace-cmd library: Remove unused private APIs for creating trace files
trace-cmd library: Remove unused API tracecmd_update_option
trace-cmd: Check if file version is supported
trace-cmd library: Add new API to get file version of input handler
trace-cmd library: Select the file version when writing trace file
trace-cmd: Add APIs for library initialization and free
trace-cmd library: Add support for compression algorithms
trace-cmd list: Show supported compression algorithms
trace-cmd library: Bump the trace file version to 7
trace-cmd library: Compress part of the trace file
trace-cmd library: Read compressed trace file
trace-cmd library: Add new API to get compression of input handler
trace-cmd library: Inherit compression algorithm from input file
trace-cmd library: Extend the create file APIs to support different
compression
trace-cmd record: Add new parameter --compression
trace-cmd dump: Add support for trace files version 7
trace-cmd library: Add support for zlib compression library
trace-cmd library: Hide the logic for updating buffer offset
trace-cmd: Move buffers description outside of options
trace-cmd library: Track the offset in the option section in the trace
file
trace-cmd library: Add compression of the option section of the trace
file
trace-cmd library: Refactor the logic for writing trace data in the
file
trace-cmd library: Add APIs for read and write compressed data in
chunks
trace-cmd: Compress trace data
trace-cmd: Read compressed trace data
trace-cmd library: Compress latency trace data
trace-cmd: Read compressed latency trace data
trace-cmd library: Reuse within the library the function that checks
file state.
trace-cmd library: Make tracecmd_copy_headers() to work with output
handler
trace-cmd: Do not use trace file compression with streams
trace-cmd library: Add new API to get file version of output handler
trace-cmd: Add file state parameter to tracecmd_copy
trace-cmd: Copy CPU count in tracecmd_copy
trace-cmd: Copy buffers description in tracecmd_copy
trace-cmd: Copy options in tracecmd_copy
trace-cmd library: Refactor the logic for writing CPU trace data
trace-cmd library: Refactor the logic for writing CPU instance trace
data
trace-cmd: Copy trace data in tracecmd_copy
trace-cmd: Add compression parameter to tracecmd_copy
trace-cmd: Add new command "trace-cmd convert"
trace-cmd record: Update man page
trace-cmd: Add convert man page
trace-cmd: Update bash completion
trace-cmd list: Update the man page
trace-cmd: Update trace.dat man page
.../trace-cmd/trace-cmd-convert.1.txt | 60 ++
Documentation/trace-cmd/trace-cmd-list.1.txt | 3 +
.../trace-cmd/trace-cmd-record.1.txt | 10 +
Documentation/trace-cmd/trace-cmd.1.txt | 4 +-
Documentation/trace-cmd/trace-cmd.dat.5.txt | 56 +-
lib/trace-cmd/Makefile | 11 +
.../include/private/trace-cmd-private.h | 92 +-
lib/trace-cmd/include/trace-cmd-local.h | 44 +-
lib/trace-cmd/trace-compress-zlib.c | 172 +++
lib/trace-cmd/trace-compress.c | 797 ++++++++++++++
lib/trace-cmd/trace-input.c | 999 ++++++++++++++----
lib/trace-cmd/trace-output.c | 877 ++++++++++-----
lib/trace-cmd/trace-util.c | 60 ++
tracecmd/Makefile | 1 +
tracecmd/include/trace-local.h | 2 +
tracecmd/trace-cmd.bash | 37 +
tracecmd/trace-cmd.c | 12 +-
tracecmd/trace-convert.c | 94 ++
tracecmd/trace-dump.c | 162 ++-
tracecmd/trace-list.c | 26 +
tracecmd/trace-listen.c | 3 +
tracecmd/trace-read.c | 14 +-
tracecmd/trace-record.c | 48 +-
tracecmd/trace-restore.c | 6 +-
tracecmd/trace-split.c | 2 +-
tracecmd/trace-stream.c | 2 +-
tracecmd/trace-usage.c | 18 +
27 files changed, 3076 insertions(+), 536 deletions(-)
create mode 100644 Documentation/trace-cmd/trace-cmd-convert.1.txt
create mode 100644 lib/trace-cmd/trace-compress-zlib.c
create mode 100644 lib/trace-cmd/trace-compress.c
create mode 100644 tracecmd/trace-convert.c
--
2.31.1
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