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authorSeongJae Park <sj@kernel.org>2022-06-13 22:22:58 +0300
committerakpm <akpm@linux-foundation.org>2022-07-04 04:08:43 +0300
commit99cdc2cd180a7adc87badc9ca92f8af803d8bf3b (patch)
treef616d7adfdce9e08ba335b3a9a1d4b5ab520a178 /include/linux/damon.h
parent0bcba960b1fa30607f3a0b566c88cd4a8a44ebaf (diff)
downloadlinux-99cdc2cd180a7adc87badc9ca92f8af803d8bf3b.tar.xz
mm/damon/schemes: add 'LRU_DEPRIO' action
This commit adds a new DAMON-based operation scheme action called 'LRU_DEPRIO' for physical address space. The action deprioritizes pages in the memory area of the target access pattern on their LRU lists. This is hence supposed to be used for rarely accessed (cold) memory regions so that cold pages could be more likely reclaimed first under memory pressure. Internally, it simply calls 'lru_deactivate()'. Using this with 'LRU_PRIO' action for hot pages, users can proactively sort LRU lists based on the access pattern. That is, it can make the LRU lists somewhat more trustworthy source of access temperature. As a result, efficiency of LRU-lists based mechanisms including the reclamation target selection could be improved. Link: https://lkml.kernel.org/r/20220613192301.8817-7-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 'include/linux/damon.h')
-rw-r--r--include/linux/damon.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/damon.h b/include/linux/damon.h
index 4c64e03e94d8..7b1f4a488230 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -87,6 +87,7 @@ struct damon_target {
* @DAMOS_HUGEPAGE: Call ``madvise()`` for the region with MADV_HUGEPAGE.
* @DAMOS_NOHUGEPAGE: Call ``madvise()`` for the region with MADV_NOHUGEPAGE.
* @DAMOS_LRU_PRIO: Prioritize the region on its LRU lists.
+ * @DAMOS_LRU_DEPRIO: Deprioritize the region on its LRU lists.
* @DAMOS_STAT: Do nothing but count the stat.
* @NR_DAMOS_ACTIONS: Total number of DAMOS actions
*/
@@ -97,6 +98,7 @@ enum damos_action {
DAMOS_HUGEPAGE,
DAMOS_NOHUGEPAGE,
DAMOS_LRU_PRIO,
+ DAMOS_LRU_DEPRIO,
DAMOS_STAT, /* Do nothing but only record the stat */
NR_DAMOS_ACTIONS,
};