This commit makes the DAMON primitives for physical address space
support the pageout action for DAMON-based Operation Schemes. With this
commit, hence, users can easily implement system-level data access-aware
reclamations using DAMOS.
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
---
mm/damon/paddr.c | 37 ++++++++++++++++++++++++++++++++++++-
1 file changed, 36 insertions(+), 1 deletion(-)
diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index d7a2ecd09ed0..957ada55de77 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -11,7 +11,9 @@
#include <linux/page_idle.h>
#include <linux/pagemap.h>
#include <linux/rmap.h>
+#include <linux/swap.h>
+#include "../internal.h"
#include "prmtv-common.h"
static bool __damon_pa_mkold(struct page *page, struct vm_area_struct *vma,
@@ -211,6 +213,39 @@ bool damon_pa_target_valid(void *t)
return true;
}
+int damon_pa_apply_scheme(struct damon_ctx *ctx, struct damon_target *t,
+ struct damon_region *r, struct damos *scheme)
+{
+ unsigned long addr;
+ LIST_HEAD(page_list);
+
+ if (scheme->action != DAMOS_PAGEOUT)
+ return -EINVAL;
+
+ for (addr = r->ar.start; addr < r->ar.end; addr += PAGE_SIZE) {
+ struct page *page = damon_get_page(PHYS_PFN(addr));
+
+ if (!page)
+ continue;
+
+ ClearPageReferenced(page);
+ test_and_clear_page_young(page);
+ if (isolate_lru_page(page)) {
+ put_page(page);
+ continue;
+ }
+ if (PageUnevictable(page)) {
+ putback_lru_page(page);
+ } else {
+ list_add(&page->lru, &page_list);
+ put_page(page);
+ }
+ }
+ reclaim_pages(&page_list);
+ cond_resched();
+ return 0;
+}
+
void damon_pa_set_primitives(struct damon_ctx *ctx)
{
ctx->primitive.init = NULL;
@@ -220,5 +255,5 @@ void damon_pa_set_primitives(struct damon_ctx *ctx)
ctx->primitive.reset_aggregated = NULL;
ctx->primitive.target_valid = damon_pa_target_valid;
ctx->primitive.cleanup = NULL;
- ctx->primitive.apply_scheme = NULL;
+ ctx->primitive.apply_scheme = damon_pa_apply_scheme;
}
--
2.17.1
