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This implements a new kernel subsystem that finds cold memory regions
using DAMON and reclaims those immediately. It is intended to be used
as proactive lightweigh reclamation logic for light memory pressure.
For heavy memory pressure, it could be inactivated and fall back to the
traditional page-scanning based reclamation.
It's implemented on top of DAMON framework to use the DAMON-based
Operation Schemes (DAMOS) feature. It utilizes all the DAMOS features
including speed limit, prioritization, and watermarks.
It could be enabled and tuned in boot time via the kernel boot
parameter, and in run time via its module parameters
('/sys/module/damon_reclaim/parameters/') interface.
[yangyingliang@huawei.com: fix error return code in damon_reclaim_turn()]
Link: https://lkml.kernel.org/r/20211025124500.2758060-1-yangyingliang@huawei.com
Link: https://lkml.kernel.org/r/20211019150731.16699-15-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Cc: Amit Shah <amit@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: David Woodhouse <dwmw@amazon.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Leonard Foerster <foersleo@amazon.de>
Cc: Marco Elver <elver@google.com>
Cc: Markus Boehme <markubo@amazon.de>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
89 lines
2.6 KiB
Plaintext
89 lines
2.6 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 primitives 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 primitives 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 primitives 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 primitives 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 primitives" 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 primitives 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_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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endmenu
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