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DAMOS_STAT action handling of paddr DAMON operations set implementation is simply ignoring the region-internal DAMOS filters, and therefore not reporting back the filter-passed bytes. Apply the filters and report back the information. Before this change, DAMOS_STAT was doing nothing for DAMOS filters. Hence users might see some performance regressions. Such regression for use cases where no region-internal DAMOS filter is added to the scheme will be negligible, since this change avoids unnecessary filtering works if no such filter is installed. For old users who are using DAMOS_STAT with the types of filters, the regression could be visible depending on the size of the region and the overhead of the installed DAMOS filters. But, because the filters were completely ignored before in the use case, no real users would really depend on such use case that makes no point. Link: https://lkml.kernel.org/r/20250106193401.109161-7-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> 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.