[POC PATCH 00/10] Add trace file compression

["Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>]

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@gmail.com/

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