[PATCH v7 0/1] Optimizing the print format of the QEMU monitor 'info mtree'

[Chao Liu <lc00631@tecorigin.com>]

From: Chao Liu <chao.liu@yeah.net>

Hi, all:

After several rounds of discussion, I think that adding a -t option to the
`info mtree` command, which enables the display of tree-like node characters
(e.g., +--, |--), is a better approach.

As BALATON Zoltan pointed out, retaining space-based indentation for displaying
memory region (mr) nodes helps ensure that the output remains easily parseable
by other programs. This also provides better compatibility with existing tools
and scripts.

Users can choose between:

- Without '-t': The default format using spaces for indentation, suitable for
  scripting and parsing;
- With '-t': The tree-style format using visual characters, ideal for
  human-readable output.

This way, both usability and compatibility are preserved.

---

v7:
- Rebased on the top of current upstream:
  d9ce74873a6a ("Merge tag 'pull-vfio-20250611' of https://github.com/legoater/qemu
  into staging")
- Add -t option to 'info mtree' for tree-style node display

v6:
- Replaced the bool type with enum mtree_node_type to improve code readability;
- Modified the output to use only one horizontal dash instead of two, and
  aligned character printing for a cleaner look.

v5:
- Fix one comment, level 0 no longer prints line characters.

v4:
- When printing the child nodes of a single node, the line characters from the
  parent node's level are no longer printed, making the output more concise
  and clear overall;
- Use more commonly used ASCII characters, such as '|--' instead of '├──',
  and '`--' instead of '└──';
- Control the number of prefix characters to reduce unnecessary output.

v3:
- Use more maintainable c functions instead of macros, as per review comments.

v2:
- Enrich the commit message, add 'info mtree' print example;
- Optimize the code implementation according to the review comments.

--
Regards,
Chao

Chao Liu (1):
  system: improve visual representation of node hierarchy in 'info
    mtree' output for qemu monitor

 hmp-commands-info.hx    |   5 +-
 include/system/memory.h |   3 +-
 monitor/hmp-cmds.c      |   3 +-
 system/memory.c         | 150 ++++++++++++++++++++++++++++++++++++----
 4 files changed, 143 insertions(+), 18 deletions(-)

-- 
2.48.1