The patch titled
Subject: mm/hugetlb: convert isolate_or_dissolve_huge_page to folios
has been added to the -mm mm-unstable branch. Its filename is
mm-hugetlb-convert-isolate_or_dissolve_huge_page-to-folios.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-hugetlb-convert-isolate_or_dissolve_huge_page-to-folios.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: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
Subject: mm/hugetlb: convert isolate_or_dissolve_huge_page to folios
Date: Thu, 13 Oct 2022 20:12:59 -0700
Removes a call to compound_head() by using a folio when operating on the
head page of a hugetlb compound page.
Link: https://lkml.kernel.org/r/20221014031303.231740-6-sidhartha.kumar@xxxxxxxxxx
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
Cc: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
Cc: Bui Quang Minh <minhquangbui99@xxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Mina Almasry <almasrymina@xxxxxxxxxx>
Cc: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/hugetlb.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
--- a/mm/hugetlb.c~mm-hugetlb-convert-isolate_or_dissolve_huge_page-to-folios
+++ a/mm/hugetlb.c
@@ -2822,7 +2822,7 @@ free_new:
int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list)
{
struct hstate *h;
- struct page *head;
+ struct folio *folio = page_folio(page);
int ret = -EBUSY;
/*
@@ -2831,9 +2831,8 @@ int isolate_or_dissolve_huge_page(struct
* Return success when racing as if we dissolved the page ourselves.
*/
spin_lock_irq(&hugetlb_lock);
- if (PageHuge(page)) {
- head = compound_head(page);
- h = page_hstate(head);
+ if (folio_test_hugetlb(folio)) {
+ h = folio_hstate(folio);
} else {
spin_unlock_irq(&hugetlb_lock);
return 0;
@@ -2848,10 +2847,10 @@ int isolate_or_dissolve_huge_page(struct
if (hstate_is_gigantic(h))
return -ENOMEM;
- if (page_count(head) && !isolate_hugetlb(head, list))
+ if (folio_ref_count(folio) && !isolate_hugetlb(&folio->page, list))
ret = 0;
- else if (!page_count(head))
- ret = alloc_and_dissolve_huge_page(h, head, list);
+ else if (!folio_ref_count(folio))
+ ret = alloc_and_dissolve_huge_page(h, &folio->page, list);
return ret;
}
_
Patches currently in -mm which might be from sidhartha.kumar@xxxxxxxxxx are
mm-hugetlb_cgroup-convert-__set_hugetlb_cgroup-to-folios.patch
mm-hugetlb_cgroup-convert-hugetlb_cgroup_from_page-to-folios.patch
mm-hugetlb_cgroup-convert-set_hugetlb_cgroup-to-folios.patch
mm-hugetlb_cgroup-convert-hugetlb_cgroup_migrate-to-folios.patch
mm-hugetlb-convert-isolate_or_dissolve_huge_page-to-folios.patch
mm-hugetlb-convert-free_huge_page-to-folios.patch
mm-hugetlb_cgroup-convert-hugetlb_cgroup_uncharge_page-to-folios.patch
mm-hugeltb_cgroup-convert-hugetlb_cgroup_commit_charge-to-folios.patch
mm-hugetlb-convert-move_hugetlb_state-to-folios.patch
