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From: Mike Rapoport <rppt@kernel.org>
To: linux-mm@kvack.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Andy Lutomirski <luto@kernel.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Ira Weiny <ira.weiny@intel.com>,
	Kees Cook <keescook@chromium.org>,
	Mike Rapoport <rppt@kernel.org>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Rick Edgecombe <rick.p.edgecombe@intel.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	x86@kernel.org, linux-kernel@vger.kernel.org
Subject: [RFC PATCH 2/4] list: Support list head not in object for list_lru
Date: Mon, 23 Aug 2021 16:25:11 +0300	[thread overview]
Message-ID: <20210823132513.15836-3-rppt@kernel.org> (raw)
In-Reply-To: <20210823132513.15836-1-rppt@kernel.org>

From: Rick Edgecombe <rick.p.edgecombe@intel.com>

In future patches, there will be a need to keep track of objects with
list_lru where the list_head is not in the object (will be in struct
page). Since list_lru automatically determines the node id from the
list_head, this will fail when using struct page.

So create a new function in list_lru, list_lru_add_node(), that allows
the node id of the item to be passed in. Otherwise it behaves exactly
like list_lru_add().

Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
---
 include/linux/list_lru.h | 13 +++++++++++++
 mm/list_lru.c            | 10 ++++++++--
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/include/linux/list_lru.h b/include/linux/list_lru.h
index 08e07c19fd13..42c22322058b 100644
--- a/include/linux/list_lru.h
+++ b/include/linux/list_lru.h
@@ -90,6 +90,19 @@ void memcg_drain_all_list_lrus(int src_idx, struct mem_cgroup *dst_memcg);
  */
 bool list_lru_add(struct list_lru *lru, struct list_head *item);
 
+/**
+ * list_lru_add_node: add an element to the lru list's tail
+ * @list_lru: the lru pointer
+ * @item: the item to be added.
+ * @nid: the node id of the item
+ *
+ * Like list_lru_add, but takes the node id as parameter instead of
+ * calculating it from the list_head passed in.
+ *
+ * Return value: true if the list was updated, false otherwise
+ */
+bool list_lru_add_node(struct list_lru *lru, struct list_head *item, int nid);
+
 /**
  * list_lru_del: delete an element to the lru list
  * @list_lru: the lru pointer
diff --git a/mm/list_lru.c b/mm/list_lru.c
index c1bec58168e1..f35f11ada8a1 100644
--- a/mm/list_lru.c
+++ b/mm/list_lru.c
@@ -112,9 +112,8 @@ list_lru_from_kmem(struct list_lru_node *nlru, void *ptr,
 }
 #endif /* CONFIG_MEMCG_KMEM */
 
-bool list_lru_add(struct list_lru *lru, struct list_head *item)
+bool list_lru_add_node(struct list_lru *lru, struct list_head *item, int nid)
 {
-	int nid = page_to_nid(virt_to_page(item));
 	struct list_lru_node *nlru = &lru->node[nid];
 	struct mem_cgroup *memcg;
 	struct list_lru_one *l;
@@ -134,6 +133,13 @@ bool list_lru_add(struct list_lru *lru, struct list_head *item)
 	spin_unlock(&nlru->lock);
 	return false;
 }
+
+bool list_lru_add(struct list_lru *lru, struct list_head *item)
+{
+	int nid = page_to_nid(virt_to_page(item));
+
+	return list_lru_add_node(lru, item, nid);
+}
 EXPORT_SYMBOL_GPL(list_lru_add);
 
 bool list_lru_del(struct list_lru *lru, struct list_head *item)
-- 
2.28.0


  parent reply	other threads:[~2021-08-23 13:25 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-23 13:25 [RFC PATCH 0/4] mm/page_alloc: cache pte-mapped allocations Mike Rapoport
2021-08-23 13:25 ` [RFC PATCH 1/4] list: Support getting most recent element in list_lru Mike Rapoport
2021-08-23 13:25 ` Mike Rapoport [this message]
2021-08-23 13:25 ` [RFC PATCH 3/4] mm/page_alloc: introduce __GFP_PTE_MAPPED flag to allocate pte-mapped pages Mike Rapoport
2021-08-23 20:29   ` Edgecombe, Rick P
2021-08-24 13:02     ` Mike Rapoport
2021-08-24 16:38       ` Edgecombe, Rick P
2021-08-24 16:54         ` Mike Rapoport
2021-08-24 17:23           ` Edgecombe, Rick P
2021-08-24 17:37             ` Mike Rapoport
2021-08-24 16:12   ` Vlastimil Babka
2021-08-25  8:43   ` David Hildenbrand
2021-08-23 13:25 ` [RFC PATCH 4/4] x86/mm: write protect (most) page tables Mike Rapoport
2021-08-23 20:08   ` Edgecombe, Rick P
2021-08-23 23:50   ` Dave Hansen
2021-08-24  3:34     ` Andy Lutomirski
2021-08-25 14:59       ` Dave Hansen
2021-08-24 13:32     ` Mike Rapoport
2021-08-25  8:38     ` David Hildenbrand
2021-08-26  8:02     ` Mike Rapoport
2021-08-26  9:01       ` Vlastimil Babka
     [not found]   ` <FB6C09CD-9CEA-4FE8-B179-98DB63EBDD68@gmail.com>
2021-08-24  5:34     ` Nadav Amit
2021-08-24 13:36       ` Mike Rapoport
2021-08-23 20:02 ` [RFC PATCH 0/4] mm/page_alloc: cache pte-mapped allocations Edgecombe, Rick P
2021-08-24 13:03   ` Mike Rapoport
2021-08-24 16:09 ` Vlastimil Babka
2021-08-29  7:06   ` Mike Rapoport

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