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authorSeongJae Park <sj@kernel.org>2023-08-03 00:43:07 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-08-21 23:37:37 +0300
commit17e7c724d3c2e622c4d9969b7a473e8ed1d14ff0 (patch)
tree475b0a3aed6e47fda06c9ed6fdb3c874f901a56f /mm/damon/sysfs-schemes.c
parent375af850385c787fc7115bf304c48b475818e5e4 (diff)
downloadlinux-17e7c724d3c2e622c4d9969b7a473e8ed1d14ff0.tar.xz
mm/damon/core: implement target type damos filter
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>
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