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Implement a sysfs file to expose addr_unit for DAMON_RECLAIM users. During parameter application, use the configured addr_unit parameter to perform the necessary initialization. Similar to the core layer, prevent setting addr_unit to zero. It is worth noting that when monitor_region_start and monitor_region_end are unset (i.e., 0), their values will later be set to biggest_system_ram. At that point, addr_unit may not be the default value 1. Although we could divide the biggest_system_ram value by addr_unit, changing addr_unit without setting monitor_region_start/end should be considered a user misoperation. And biggest_system_ram is only within the 0~ULONG_MAX range, system can clearly work correctly with addr_unit=1. Therefore, if monitor_region_start/end are unset, always silently reset addr_unit to 1. Link: https://lkml.kernel.org/r/20250910113221.1065764-3-yanquanmin1@huawei.com Signed-off-by: Quanmin Yan <yanquanmin1@huawei.com> Reviewed-by: SeongJae Park <sj@kernel.org> Cc: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: ze zuo <zuoze1@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.