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Subject[RFC v3 01/15] mm/damon/paddr: Support the pageout scheme
Date
From: SeongJae Park <sjpark@amazon.de>

This commit makes the DAMON primitives for physical address space to
support the pageout action for DAMON-based Operation Schemes. IOW, now
the users can implement their own data access-aware reclamations for
whole system using DAMOS.

Signed-off-by: SeongJae Park <sjpark@amazon.de>
---
mm/damon/paddr.c | 38 +++++++++++++++++++++++++++++++++++++-
mm/damon/prmtv-common.c | 2 +-
mm/damon/prmtv-common.h | 2 ++
3 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index b92b07a3ce53..303db372e53b 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -7,6 +7,9 @@

#define pr_fmt(fmt) "damon-pa: " fmt

+#include <linux/swap.h>
+
+#include "../internal.h"
#include "prmtv-common.h"

/*
@@ -85,6 +88,39 @@ 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;
@@ -94,5 +130,5 @@ 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;
}
diff --git a/mm/damon/prmtv-common.c b/mm/damon/prmtv-common.c
index 08e9318d67ed..01c1c1b37859 100644
--- a/mm/damon/prmtv-common.c
+++ b/mm/damon/prmtv-common.c
@@ -14,7 +14,7 @@
* The body of this function is stolen from the 'page_idle_get_page()'. We
* steal rather than reuse it because the code is quite simple.
*/
-static struct page *damon_get_page(unsigned long pfn)
+struct page *damon_get_page(unsigned long pfn)
{
struct page *page = pfn_to_online_page(pfn);

diff --git a/mm/damon/prmtv-common.h b/mm/damon/prmtv-common.h
index 939c41af6b59..ba0c4eecbb79 100644
--- a/mm/damon/prmtv-common.h
+++ b/mm/damon/prmtv-common.h
@@ -18,6 +18,8 @@
/* Get a random number in [l, r) */
#define damon_rand(l, r) (l + prandom_u32_max(r - l))

+struct page *damon_get_page(unsigned long pfn);
+
void damon_va_mkold(struct mm_struct *mm, unsigned long addr);
bool damon_va_young(struct mm_struct *mm, unsigned long addr,
unsigned long *page_sz);
--
2.17.1
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