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One DAMON context can have multiple monitoring targets, and DAMOS schemes are applied to all targets. In some cases, users need to apply different scheme to different targets. Retrieving monitoring results via DAMON sysfs interface' 'tried_regions' directory could be one good example. Also, there could be cases that cgroup DAMOS filter is not enough. All such use cases can be worked around by having multiple DAMON contexts having only single target, but it is inefficient in terms of resource usage, thogh the overhead is not estimated to be huge. Implement DAMON monitoring target based DAMOS filter for the case. Like address range target DAMOS filter, handle these filters in the DAMON core layer, since it is more efficient than doing in operations set layer. This also means that regions that filtered out by monitoring target type DAMOS filters are counted as not tried by the scheme. Hence, target granularity monitoring results retrieval via DAMON sysfs interface becomes available. Link: https://lkml.kernel.org/r/20230802214312.110532-9-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Cc: Brendan Higgins <brendanhiggins@google.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Shuah Khan <shuah@kernel.org> 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 Restructured Text 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.