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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 /mm/damon
parent0bcba960b1fa30607f3a0b566c88cd4a8a44ebaf (diff)
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 'mm/damon')
-rw-r--r--mm/damon/paddr.c20
-rw-r--r--mm/damon/sysfs.c1
2 files changed, 21 insertions, 0 deletions
diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index f145b1d51e13..dc131c6a5403 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -249,6 +249,22 @@ static unsigned long damon_pa_mark_accessed(struct damon_region *r)
return applied * PAGE_SIZE;
}
+static unsigned long damon_pa_deactivate_pages(struct damon_region *r)
+{
+ unsigned long addr, applied = 0;
+
+ for (addr = r->ar.start; addr < r->ar.end; addr += PAGE_SIZE) {
+ struct page *page = damon_get_page(PHYS_PFN(addr));
+
+ if (!page)
+ continue;
+ deactivate_page(page);
+ put_page(page);
+ applied++;
+ }
+ return applied * PAGE_SIZE;
+}
+
static unsigned long damon_pa_apply_scheme(struct damon_ctx *ctx,
struct damon_target *t, struct damon_region *r,
struct damos *scheme)
@@ -258,6 +274,8 @@ static unsigned long damon_pa_apply_scheme(struct damon_ctx *ctx,
return damon_pa_pageout(r);
case DAMOS_LRU_PRIO:
return damon_pa_mark_accessed(r);
+ case DAMOS_LRU_DEPRIO:
+ return damon_pa_deactivate_pages(r);
default:
break;
}
@@ -273,6 +291,8 @@ static int damon_pa_scheme_score(struct damon_ctx *context,
return damon_pageout_score(context, r, scheme);
case DAMOS_LRU_PRIO:
return damon_hot_score(context, r, scheme);
+ case DAMOS_LRU_DEPRIO:
+ return damon_pageout_score(context, r, scheme);
default:
break;
}
diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index 86c69f980927..7488e27c87c3 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -763,6 +763,7 @@ static const char * const damon_sysfs_damos_action_strs[] = {
"hugepage",
"nohugepage",
"lru_prio",
+ "lru_deprio",
"stat",
};