linux-kernel - [RFC PATCH 5/8] mm: shmem: extend shmem_partial_swap

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Message-Id: <e0009cd7362f64da08aea5883e753192e137da39.1716285099.git.baolin.wang@linux.alibaba.com>
Date: Tue, 21 May 2024 19:03:15 +0800
From: Baolin Wang <baolin.wang@...ux.alibaba.com>
To: akpm@...ux-foundation.org,
	hughd@...gle.com
Cc: willy@...radead.org,
	david@...hat.com,
	ioworker0@...il.com,
	hrisl@...nel.org,
	p.raghav@...sung.com,
	da.gomez@...sung.com,
	wangkefeng.wang@...wei.com,
	ying.huang@...el.com,
	21cnbao@...il.com,
	ryan.roberts@....com,
	shy828301@...il.com,
	ziy@...dia.com,
	baolin.wang@...ux.alibaba.com,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 5/8] mm: shmem: extend shmem_partial_swap_usage() to support large folio swap

To support shmem large folio swapout in the following patches, using
xa_get_order() to get the order of the swap entry to calculate the swap
usage of shmem.

Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
---
 mm/shmem.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index 74821a7031b8..bc099e8b9952 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -865,13 +865,16 @@ unsigned long shmem_partial_swap_usage(struct address_space *mapping,
 	struct page *page;
 	unsigned long swapped = 0;
 	unsigned long max = end - 1;
+	int order;
 
 	rcu_read_lock();
 	xas_for_each(&xas, page, max) {
 		if (xas_retry(&xas, page))
 			continue;
-		if (xa_is_value(page))
-			swapped++;
+		if (xa_is_value(page)) {
+			order = xa_get_order(xas.xa, xas.xa_index);
+			swapped += 1 << order;
+		}
 		if (xas.xa_index == max)
 			break;
 		if (need_resched()) {
-- 
2.39.3