A new PoC 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. Only part of the trace file metadata is compressed:
- 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
Todo list, in order to have complete trace file compression:
- Compress trace data.
- Add support for more compression libraries.
- Add new trace-cmd command to convert trace files from version 6 to
version 7 and vise versa.
- Test all trace-cmd commands with trace file v7.
- Update trace-cmd documentation.
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) (21):
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
lib/trace-cmd/Makefile | 11 +
.../include/private/trace-cmd-private.h | 71 ++-
lib/trace-cmd/include/trace-cmd-local.h | 9 +-
lib/trace-cmd/trace-compress-zlib.c | 172 ++++++
lib/trace-cmd/trace-compress.c | 543 ++++++++++++++++++
lib/trace-cmd/trace-input.c | 375 +++++++++---
lib/trace-cmd/trace-output.c | 541 ++++++++++++-----
lib/trace-cmd/trace-util.c | 19 +
tracecmd/trace-cmd.c | 11 +-
tracecmd/trace-dump.c | 162 +++++-
tracecmd/trace-list.c | 26 +
tracecmd/trace-listen.c | 3 +
tracecmd/trace-record.c | 42 +-
tracecmd/trace-restore.c | 4 +-
tracecmd/trace-usage.c | 6 +
15 files changed, 1703 insertions(+), 292 deletions(-)
create mode 100644 lib/trace-cmd/trace-compress-zlib.c
create mode 100644 lib/trace-cmd/trace-compress.c
--
2.31.1
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