Commit 43b0536c authored by SeongJae Park's avatar SeongJae Park Committed by Linus Torvalds

mm/damon: introduce DAMON-based Reclamation (DAMON_RECLAIM)

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.orgSigned-off-by: default avatarSeongJae Park <sj@kernel.org>
Signed-off-by: default avatarYang 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 1dc90ccd
......@@ -73,4 +73,16 @@ config DAMON_DBGFS_KUNIT_TEST
If unsure, say N.
config DAMON_RECLAIM
bool "Build DAMON-based reclaim (DAMON_RECLAIM)"
depends on DAMON_PADDR
help
This builds the DAMON-based reclamation subsystem. It finds pages
that not accessed for a long time (cold) using DAMON and reclaim
those.
This is suggested to be used as a proactive and lightweight
reclamation under light memory pressure, while the traditional page
scanning-based reclamation is used for heavy pressure.
endmenu
......@@ -4,3 +4,4 @@ obj-$(CONFIG_DAMON) := core.o
obj-$(CONFIG_DAMON_VADDR) += prmtv-common.o vaddr.o
obj-$(CONFIG_DAMON_PADDR) += prmtv-common.o paddr.o
obj-$(CONFIG_DAMON_DBGFS) += dbgfs.o
obj-$(CONFIG_DAMON_RECLAIM) += reclaim.o
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