A new PoC implementation for adding a compression to trace file version 7.
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
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
Todo list, in order to have complete trace file compression:
- Compress trace file options.
- 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.
- Add compression support to all trace-cmd commands.
- Update trace-cmd documentation.
This patch set depends on "[PATCH 0/6] Bump trace file version"
and should be applied on top of it.
https://lore.kernel.org/linux-trace-devel/20210422071718.483383-1-tz.stoyanov@xxxxxxxxx/
Tzvetomir Stoyanov (VMware) (10):
trace-cmd: Add APIs for library initialization and free
trace-cmd library: Add support for compression algorithms
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
lib/trace-cmd/Makefile | 11 +
.../include/private/trace-cmd-private.h | 42 ++-
lib/trace-cmd/include/trace-cmd-local.h | 7 +
lib/trace-cmd/trace-compress-zlib.c | 172 ++++++++++
lib/trace-cmd/trace-compress.c | 289 +++++++++++++++++
lib/trace-cmd/trace-input.c | 304 +++++++++++++-----
lib/trace-cmd/trace-output.c | 268 ++++++++++++---
lib/trace-cmd/trace-util.c | 12 +
tracecmd/trace-cmd.c | 11 +-
tracecmd/trace-dump.c | 164 ++++++++--
tracecmd/trace-record.c | 18 +-
tracecmd/trace-restore.c | 4 +-
tracecmd/trace-usage.c | 1 +
13 files changed, 1152 insertions(+), 151 deletions(-)
create mode 100644 lib/trace-cmd/trace-compress-zlib.c
create mode 100644 lib/trace-cmd/trace-compress.c
--
2.30.2
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