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Users can do data access-aware LRU-lists sorting using 'LRU_PRIO' and 'LRU_DEPRIO' DAMOS actions. However, finding best parameters including the hotness/coldness thresholds, CPU quota, and watermarks could be challenging for some users. To make the scheme easy to be used without complex tuning for common situations, this commit implements a static kernel module called 'DAMON_LRU_SORT' using the 'LRU_PRIO' and 'LRU_DEPRIO' DAMOS actions. It proactively sorts LRU-lists using DAMON with conservatively chosen default values of the parameters. That is, the module under its default parameters will make no harm for common situations but provide some level of efficiency improvements for systems having clear hot/cold access pattern under a level of memory pressure while consuming only a limited small portion of CPU time. Link: https://lkml.kernel.org/r/20220613192301.8817-9-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>
104 lines
3.1 KiB
Plaintext
104 lines
3.1 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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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://damonitor.github.io/doc/html/latest-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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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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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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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_DBGFS
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bool "DAMON debugfs interface"
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depends on DAMON_VADDR && DAMON_PADDR && DEBUG_FS
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help
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This builds the debugfs interface for DAMON. The user space admins
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can use the interface for arbitrary data access monitoring.
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If unsure, say N.
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config DAMON_DBGFS_KUNIT_TEST
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bool "Test for damon debugfs interface" if !KUNIT_ALL_TESTS
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depends on DAMON_DBGFS && KUNIT=y
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default KUNIT_ALL_TESTS
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help
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This builds the DAMON debugfs 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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