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mm/hugetlb-cgroup: convert hugetlb_cgroup_css_offline() to work on folios

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Let's convert hugetlb_cgroup_css_offline() and
hugetlb_cgroup_move_parent() to work on folios.  hugepage_activelist
contains folios, not pages.

While at it, rename page_hcg simply to hcg, removing most of the "page"
terminology.

This removes an unnecessary call to compound_head().

Link: https://lkml.kernel.org/r/20250113131611.2554758-6-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2025-01-13 14:16:10 +01:00 • committed by Andrew Morton
parent b235448e8c
commit 3f982b9b18
1 changed files with 8 additions and 9 deletions
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17
mm/hugetlb_cgroup.c
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@ -195,24 +195,23 @@ static void hugetlb_cgroup_css_free(struct cgroup_subsys_state *css)
* cannot fail.
*/
static void hugetlb_cgroup_move_parent(int idx, struct hugetlb_cgroup *h_cg,
struct page *page)
struct folio *folio)
{
unsigned int nr_pages;
struct page_counter *counter;
struct hugetlb_cgroup *page_hcg;
struct hugetlb_cgroup *hcg;
struct hugetlb_cgroup *parent = parent_hugetlb_cgroup(h_cg);
struct folio *folio = page_folio(page);
page_hcg = hugetlb_cgroup_from_folio(folio);
hcg = hugetlb_cgroup_from_folio(folio);
/*
* We can have pages in active list without any cgroup
* ie, hugepage with less than 3 pages. We can safely
* ignore those pages.
*/
if (!page_hcg || page_hcg != h_cg)
if (!hcg || hcg != h_cg)
goto out;
nr_pages = compound_nr(page);
nr_pages = folio_nr_pages(folio);
if (!parent) {
parent = root_h_cgroup;
/* root has no limit */
@ -235,13 +234,13 @@ static void hugetlb_cgroup_css_offline(struct cgroup_subsys_state *css)
{
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css);
struct hstate *h;
struct page *page;
struct folio *folio;
do {
for_each_hstate(h) {
spin_lock_irq(&hugetlb_lock);
list_for_each_entry(page, &h->hugepage_activelist, lru)
hugetlb_cgroup_move_parent(hstate_index(h), h_cg, page);
list_for_each_entry(folio, &h->hugepage_activelist, lru)
hugetlb_cgroup_move_parent(hstate_index(h), h_cg, folio);
spin_unlock_irq(&hugetlb_lock);
}