linux-kernel - [PATCH v5 2/4] mm: Introduce mem_cgroup_swapin_uncharge_swap

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Message-Id: <20240726094618.401593-3-21cnbao@gmail.com>
Date: Fri, 26 Jul 2024 21:46:16 +1200
From: Barry Song <21cnbao@...il.com>
To: akpm@...ux-foundation.org,
	linux-mm@...ck.org
Cc: ying.huang@...el.com,
	baolin.wang@...ux.alibaba.com,
	chrisl@...nel.org,
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	linux-kernel@...r.kernel.org,
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	senozhatsky@...omium.org,
	shakeel.butt@...ux.dev,
	shy828301@...il.com,
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	v-songbaohua@...o.com,
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Subject: [PATCH v5 2/4] mm: Introduce mem_cgroup_swapin_uncharge_swap_nr() helper for large folios swap-in

From: Barry Song <v-songbaohua@...o.com>

With large folios swap-in, we might need to uncharge multiple entries
all together, it is better to introduce a helper for that.

Signed-off-by: Barry Song <v-songbaohua@...o.com>
---
 include/linux/memcontrol.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 1b79760af685..55958cbce61b 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -684,6 +684,14 @@ int mem_cgroup_swapin_charge_folio(struct folio *folio, struct mm_struct *mm,
 				  gfp_t gfp, swp_entry_t entry);
 void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry);
 
+static inline void mem_cgroup_swapin_uncharge_swap_nr(swp_entry_t entry, int nr)
+{
+	int i;
+
+	for (i = 0; i < nr; i++, entry.val++)
+		mem_cgroup_swapin_uncharge_swap(entry);
+}
+
 void __mem_cgroup_uncharge(struct folio *folio);
 
 /**
@@ -1185,6 +1193,10 @@ static inline void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry)
 {
 }
 
+static inline void mem_cgroup_swapin_uncharge_swap_nr(swp_entry_t entry, int nr)
+{
+}
+
 static inline void mem_cgroup_uncharge(struct folio *folio)
 {
 }
-- 
2.34.1