mm/damon/paddr: activate DAMOS_LRU_PRIO targets instead of marking accessed

DAMOS_LRU_DEPRIOD directly deactivates the pages, while DAMOS_LRU_PRIO
calls folio_mark_accessed(), which does incremental activation.  The
incremental activation was assumed to be useful for making sure the pages
of the hot memory region are really hot.  After the introduction of
DAMOS_LRU_PRIO, the young page filter has added.  Users can use the young
page filter to make sure the page is eligible to be activated.  Meanwhile,
the asymmetric behavior of DAMOS_LRU_[DE]PRIO can confuse users.

Directly activate given pages for DAMOS_LRU_PRIO, to eliminate the
unnecessary incremental activation steps, and be symmetric with
DAMOS_LRU_DEPRIO for easier usages.

Link: https://lkml.kernel.org/r/20260113152717.70459-5-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index 7d887a3c08665cfeaad67b4e9694548441d22daf..4c2c935d82d67a9c21d6628039ea387de534d34f 100644 (file)
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -206,9 +206,9 @@ put_folio:
        return damon_pa_core_addr(applied * PAGE_SIZE, addr_unit);
 }
 
-static inline unsigned long damon_pa_mark_accessed_or_deactivate(
+static inline unsigned long damon_pa_de_activate(
                struct damon_region *r, unsigned long addr_unit,
-               struct damos *s, bool mark_accessed,
+               struct damos *s, bool activate,
                unsigned long *sz_filter_passed)
 {
        phys_addr_t addr, applied = 0;
@@ -227,8 +227,8 @@ static inline unsigned long damon_pa_mark_accessed_or_deactivate(
                else
                        *sz_filter_passed += folio_size(folio) / addr_unit;
 
-               if (mark_accessed)
-                       folio_mark_accessed(folio);
+               if (activate)
+                       folio_activate(folio);
                else
                        folio_deactivate(folio);
                applied += folio_nr_pages(folio);
@@ -240,20 +240,18 @@ put_folio:
        return damon_pa_core_addr(applied * PAGE_SIZE, addr_unit);
 }
 
-static unsigned long damon_pa_mark_accessed(struct damon_region *r,
+static unsigned long damon_pa_activate_pages(struct damon_region *r,
                unsigned long addr_unit, struct damos *s,
                unsigned long *sz_filter_passed)
 {
-       return damon_pa_mark_accessed_or_deactivate(r, addr_unit, s, true,
-                       sz_filter_passed);
+       return damon_pa_de_activate(r, addr_unit, s, true, sz_filter_passed);
 }
 
 static unsigned long damon_pa_deactivate_pages(struct damon_region *r,
                unsigned long addr_unit, struct damos *s,
                unsigned long *sz_filter_passed)
 {
-       return damon_pa_mark_accessed_or_deactivate(r, addr_unit, s, false,
-                       sz_filter_passed);
+       return damon_pa_de_activate(r, addr_unit, s, false, sz_filter_passed);
 }
 
 static unsigned long damon_pa_migrate(struct damon_region *r,
@@ -327,7 +325,7 @@ static unsigned long damon_pa_apply_scheme(struct damon_ctx *ctx,
        case DAMOS_PAGEOUT:
                return damon_pa_pageout(r, aunit, scheme, sz_filter_passed);
        case DAMOS_LRU_PRIO:
-               return damon_pa_mark_accessed(r, aunit, scheme,
+               return damon_pa_activate_pages(r, aunit, scheme,
                                sz_filter_passed);
        case DAMOS_LRU_DEPRIO:
                return damon_pa_deactivate_pages(r, aunit, scheme,