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Make DAMON sysfs interface to read the user inputs for DAMOS quota goals
and pass those to DAMOS, so that the users can use the quota auto-tuning
feature. It uses the DAMON sysfs interface's user input commit mechanism,
which applies all user inputs for initial starting of DAMON and online
input updates, which can be done by writing 'on' and 'commit' to the
kdamond's 'state' file, respectively. In other words, the user should
periodically write appropriate value to 'current_value' files and 'commit'
command to the 'state' file. 'target_value' files could also be similarly
updated at any time.
Note that the interface is supporting multiple goals while the core logic
supports only one goal. DAMON sysfs interface passes only best feedback
among the given inputs, to avoid making DAMOS too aggressive.
Link: https://lkml.kernel.org/r/20231130023652.50284-4-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: David Gow <davidgow@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
8b549a4fd3