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FEATURES_DEPRECATION_SCHEDULE.md

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Deprecated, or Will be Deprecated Features

Below are features that deprecated, or will be deprecated. If you depend on any of those, please report.

damo fmt_json

Will be deprecated by 2024-11. Use damo args damon --format json instead.

--damon_interface

Deprecated. Use --damon_interface_DEPRECATED instead.

DAMON provides two major user interfaces, namely 'DAMON debugfs' and 'DAMON sysfs' interfaces. damo subcommands for DAMON control such as start, stop, tune therefore provided --damon_interface option to allow selection of the interface. That's mostly for testing purpose, not for real users. Also DAMON debugfs interface is deprecated in Linux kernel. Hence --damon_interface is deprecated, and replaced by --damon_interface_DEPRECATED. --damon_interface_DEPRECTED will also be deprecated and removed soon.

damo translate_damos

Deprecated. Use the command of v2.0.2 or lower version of DAMO instead.

DAMON record binary format

Deprecated. Use json_compressed format instead.

At the beginning, DAMO used its special binary format, namely record. It is designed for lightweight saving of the monitoring results. It is difficult to read, and not that efficient compared to fancy compression techniques. json based monitoring results can be easier to read, and more efficient when compression technique is used. Hence, the format is deprecated. You may use damo convert_record_format of v2.0.2 or lower version of DAMO to convert your old record binary format monitoring results files to the new format.

Python2 support

Deprecated. Use Python3.

For some old distros, DAMO initially supported Python2. Because Python2 is really old now, the support has deprecated. Please use Python3 or newer.

DAMOS single line format

Deprecated. Use --damos_* command line options or json format input.

A simple DAMOS scheme specification format called one-line scheme specification was initially supported. Because it is not flexible for extension of features, it has deprecated now. You may use --damos_* command line options or json format instead. You could use damo translate_damos ov v2.0.2 or lower version of DAMO to convert your old single line DAMOS schemes specification to the new json format.

--rbuf option of damo record

Deprecated.

Early versions of DAMON supported in-kernel direct monitoring results record file generation. To control the overhead of it, DAMO allowed user to specify the size of buffer for the work. The feature has not merged into the mainline, and discarded. Hence the option was available for only few kernels that ported the feature. For most of kernels, tracepoint based record file generation is being used, and the overhead of the approach is subtle. Hence, the option has deprecated.