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authorSeongJae Park <sj@kernel.org>2022-06-13 19:23:00 +0000
committerakpm <akpm@linux-foundation.org>2022-07-03 18:08:43 -0700
commit40e983cca9274e177bd5b9379299b44d9536ac68 (patch)
tree4b19d4d01255ce56c603b55799e0b6914d8491f7 /mm/damon/Kconfig
parentb57e39a743e4efc6945523f121691ac76f9161de (diff)
downloadlinux-40e983cca9274e177bd5b9379299b44d9536ac68.tar.bz2
mm/damon: introduce DAMON-based LRU-lists Sorting
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>
Diffstat (limited to 'mm/damon/Kconfig')
-rw-r--r--mm/damon/Kconfig8
1 files changed, 8 insertions, 0 deletions
diff --git a/mm/damon/Kconfig b/mm/damon/Kconfig
index 9b559c76d6dd..66265e3a9c65 100644
--- a/mm/damon/Kconfig
+++ b/mm/damon/Kconfig
@@ -92,4 +92,12 @@ config DAMON_RECLAIM
reclamation under light memory pressure, while the traditional page
scanning-based reclamation is used for heavy pressure.
+config DAMON_LRU_SORT
+ bool "Build DAMON-based LRU-lists sorting (DAMON_LRU_SORT)"
+ depends on DAMON_PADDR
+ help
+ This builds the DAMON-based LRU-lists sorting subsystem. It tries to
+ protect frequently accessed (hot) pages while rarely accessed (cold)
+ pages reclaimed first under memory pressure.
+
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