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dfc02531f4
When setting regions in DAMON_RECLAIM, DAMON_MIN_REGION will be applied as
the core address alignment, and the monitoring target address ranges would
be aligned on DAMON_MIN_REGION * addr_unit. When users 1) set addr_unit
to a value larger than 1, and 2) set the monitoring target address range
as not aligned on DAMON_MIN_REGION * addr_unit, it will cause
DAMON_RECLAIM to operate on unexpectedly large physical address ranges.
For example, if the user sets the monitoring target address range to [4,
8) and addr_unit as 1024, the aimed monitoring target address range is [4
KiB, 8 KiB). Assuming DAMON_MIN_REGION is 4096, so resulting target
address range will be [0, 4096) in the DAMON core layer address system,
and [0, 4 MiB) in the physical address space, which is an unexpected
range.
To fix the issue, use min_sz_region for core address alignment when
setting regions.
Link: https://lkml.kernel.org/r/20251020130125.2875164-3-yanquanmin1@huawei.com
Fixes: 7db551fcfb ("mm/damon/reclaim: support addr_unit for DAMON_RECLAIM")
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.