linux-kernel - [PATCH 01/15] mm/damon/paddr: Support the pageout scheme

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20211019150731.16699-2-sj@kernel.org>
Date:   Tue, 19 Oct 2021 15:07:17 +0000
From:   SeongJae Park <sj@...nel.org>
To:     akpm@...ux-foundation.org
Cc:     SeongJae Park <sj@...nel.org>, Jonathan.Cameron@...wei.com,
        amit@...nel.org, benh@...nel.crashing.org, corbet@....net,
        david@...hat.com, dwmw@...zon.com, elver@...gle.com,
        foersleo@...zon.de, gthelen@...gle.com, markubo@...zon.de,
        rientjes@...gle.com, shakeelb@...gle.com, shuah@...nel.org,
        linux-damon@...zon.com, linux-mm@...ck.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 01/15] mm/damon/paddr: Support the pageout scheme

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@...nel.org>
---
 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