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As of this writing, multiple major distros including Alma, Amazon, Android, CentOS, Debian, Fedora, and Oracle are build-enabling DAMON (set CONFIG_DAMON[1]). Enabling it by default will save configuration setup time for the current and future DAMON users. Build-enabling DAMON does not introduce a real risk since it makes no behavioral change by default. It requires explicit user requests to do anything. Only one potential risk is making the size of the kernel a little bit larger. On a production-purpose configuration, it increases the resulting kernel package size by about 0.1 % of the final package file. I believe that's too small to be a real problem in common setups. Hence, the benefit of enabling CONFIG_DAMON outweighs the potential risk. Set CONFIG_DAMON by default. Link: https://oracle.github.io/kconfigs/?config=UTS_RELEASE&config=DAMON [1] Link: https://lkml.kernel.org/r/20250521042755.39653-3-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Acked-by: Honggyu Kim <honggyu.kim@sk.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
99 lines
2.9 KiB
Plaintext
99 lines
2.9 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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menu "Data Access Monitoring"
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config DAMON
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bool "DAMON: Data Access Monitoring Framework"
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default y
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help
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This builds a framework that allows kernel subsystems to monitor
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access frequency of each memory region. The information can be useful
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for performance-centric DRAM level memory management.
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See https://www.kernel.org/doc/html/latest/mm/damon/index.html for
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more information.
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config DAMON_KUNIT_TEST
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bool "Test for damon" if !KUNIT_ALL_TESTS
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depends on DAMON && KUNIT=y
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default KUNIT_ALL_TESTS
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help
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This builds the DAMON Kunit test suite.
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For more information on KUnit and unit tests in general, please refer
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to the KUnit documentation.
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If unsure, say N.
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config DAMON_VADDR
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bool "Data access monitoring operations for virtual address spaces"
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depends on DAMON && MMU
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select PAGE_IDLE_FLAG
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default DAMON
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help
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This builds the default data access monitoring operations for DAMON
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that work for virtual address spaces.
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config DAMON_PADDR
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bool "Data access monitoring operations for the physical address space"
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depends on DAMON && MMU
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select PAGE_IDLE_FLAG
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default DAMON
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help
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This builds the default data access monitoring operations for DAMON
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that works for the physical address space.
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config DAMON_VADDR_KUNIT_TEST
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bool "Test for DAMON operations" if !KUNIT_ALL_TESTS
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depends on DAMON_VADDR && KUNIT=y
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default KUNIT_ALL_TESTS
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help
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This builds the DAMON virtual addresses operations Kunit test suite.
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For more information on KUnit and unit tests in general, please refer
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to the KUnit documentation.
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If unsure, say N.
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config DAMON_SYSFS
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bool "DAMON sysfs interface"
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depends on DAMON && SYSFS
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default DAMON
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help
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This builds the sysfs interface for DAMON. The user space can use
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the interface for arbitrary data access monitoring.
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config DAMON_SYSFS_KUNIT_TEST
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bool "Test for damon sysfs interface" if !KUNIT_ALL_TESTS
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depends on DAMON_SYSFS && KUNIT=y
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default KUNIT_ALL_TESTS
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help
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This builds the DAMON sysfs interface Kunit test suite.
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For more information on KUnit and unit tests in general, please refer
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to the KUnit documentation.
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If unsure, say N.
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config DAMON_RECLAIM
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bool "Build DAMON-based reclaim (DAMON_RECLAIM)"
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depends on DAMON_PADDR
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help
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This builds the DAMON-based reclamation subsystem. It finds pages
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that not accessed for a long time (cold) using DAMON and reclaim
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those.
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This is suggested to be used as a proactive and lightweight
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reclamation under light memory pressure, while the traditional page
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scanning-based reclamation is used for heavy pressure.
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config DAMON_LRU_SORT
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bool "Build DAMON-based LRU-lists sorting (DAMON_LRU_SORT)"
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depends on DAMON_PADDR
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help
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This builds the DAMON-based LRU-lists sorting subsystem. It tries to
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protect frequently accessed (hot) pages while rarely accessed (cold)
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pages reclaimed first under memory pressure.
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endmenu
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