The patch titled
Subject: mm/ksm: use folio in stable_node_dup
has been added to the -mm mm-unstable branch. Its filename is
mm-ksm-use-folio-in-stable_node_dup.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-ksm-use-folio-in-stable_node_dup.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Alex Shi (tencent)" <alexs@xxxxxxxxxx>
Subject: mm/ksm: use folio in stable_node_dup
Date: Thu, 11 Apr 2024 14:17:06 +0800
Use ksm_get_folio() and save 2 compound_head calls.
Link: https://lkml.kernel.org/r/20240411061713.1847574-6-alexs@xxxxxxxxxx
Signed-off-by: Alex Shi (tencent) <alexs@xxxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Izik Eidus <izik.eidus@xxxxxxxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Chris Wright <chrisw@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/ksm.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
--- a/mm/ksm.c~mm-ksm-use-folio-in-stable_node_dup
+++ a/mm/ksm.c
@@ -1638,7 +1638,7 @@ static struct page *stable_node_dup(stru
{
struct ksm_stable_node *dup, *found = NULL, *stable_node = *_stable_node;
struct hlist_node *hlist_safe;
- struct page *_tree_page, *tree_page = NULL;
+ struct folio *folio, *tree_folio = NULL;
int nr = 0;
int found_rmap_hlist_len;
@@ -1657,24 +1657,24 @@ static struct page *stable_node_dup(stru
* We must walk all stable_node_dup to prune the stale
* stable nodes during lookup.
*
- * get_ksm_page can drop the nodes from the
+ * ksm_get_folio can drop the nodes from the
* stable_node->hlist if they point to freed pages
* (that's why we do a _safe walk). The "dup"
* stable_node parameter itself will be freed from
* under us if it returns NULL.
*/
- _tree_page = get_ksm_page(dup, GET_KSM_PAGE_NOLOCK);
- if (!_tree_page)
+ folio = ksm_get_folio(dup, GET_KSM_PAGE_NOLOCK);
+ if (!folio)
continue;
nr += 1;
if (is_page_sharing_candidate(dup)) {
if (!found ||
dup->rmap_hlist_len > found_rmap_hlist_len) {
if (found)
- put_page(tree_page);
+ folio_put(tree_folio);
found = dup;
found_rmap_hlist_len = found->rmap_hlist_len;
- tree_page = _tree_page;
+ tree_folio = folio;
/* skip put_page for found dup */
if (!prune_stale_stable_nodes)
@@ -1682,7 +1682,7 @@ static struct page *stable_node_dup(stru
continue;
}
}
- put_page(_tree_page);
+ folio_put(folio);
}
if (found) {
@@ -1747,7 +1747,7 @@ static struct page *stable_node_dup(stru
}
*_stable_node_dup = found;
- return tree_page;
+ return &tree_folio->page;
}
static struct ksm_stable_node *stable_node_dup_any(struct ksm_stable_node *stable_node,
_
Patches currently in -mm which might be from alexs@xxxxxxxxxx are
mm-ksm-add-ksm_get_folio.patch
mm-ksm-use-folio-in-remove_rmap_item_from_tree.patch
mm-ksm-add-folio_set_stable_node.patch
mm-ksm-use-folio-in-remove_stable_node.patch
mm-ksm-use-folio-in-stable_node_dup.patch
mm-ksm-use-ksm_get_folio-in-scan_get_next_rmap_item.patch
mm-ksm-use-folio-in-write_protect_page.patch
mm-ksm-convert-chain-series-funcs-and-replace-get_ksm_page.patch
mm-ksm-replace-set_page_stable_node-by-folio_set_stable_node.patch
