mem_cgroup_charge() already assumed it was being passed a non-tail
page (and looking at the callers, that's true; it's called for freshly
allocated pages). The only real change here is that folio_nr_pages()
doesn't compile away like thp_nr_pages() does as folio support
is not conditional on transparent hugepage support. Reimplement
mem_cgroup_charge() as a wrapper around folio_charge_cgroup().
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
include/linux/memcontrol.h | 8 ++++++++
mm/folio-compat.c | 7 +++++++
mm/memcontrol.c | 26 +++++++++++++-------------
3 files changed, 28 insertions(+), 13 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 4460ff0e70a1..a50e5cee6d2c 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -704,6 +704,8 @@ static inline bool mem_cgroup_below_min(struct mem_cgroup *memcg)
page_counter_read(&memcg->memory);
}
+int folio_charge_cgroup(struct folio *, struct mm_struct *, gfp_t);
+
int mem_cgroup_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask);
int mem_cgroup_swapin_charge_page(struct page *page, struct mm_struct *mm,
gfp_t gfp, swp_entry_t entry);
@@ -1216,6 +1218,12 @@ static inline bool mem_cgroup_below_min(struct mem_cgroup *memcg)
return false;
}
+static inline int folio_charge_cgroup(struct folio *folio,
+ struct mm_struct *mm, gfp_t gfp)
+{
+ return 0;
+}
+
static inline int mem_cgroup_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask)
{
diff --git a/mm/folio-compat.c b/mm/folio-compat.c
index a374747ae1c6..1d71b8b587f8 100644
--- a/mm/folio-compat.c
+++ b/mm/folio-compat.c
@@ -48,3 +48,10 @@ void mark_page_accessed(struct page *page)
folio_mark_accessed(page_folio(page));
}
EXPORT_SYMBOL(mark_page_accessed);
+
+#ifdef CONFIG_MEMCG
+int mem_cgroup_charge(struct page *page, struct mm_struct *mm, gfp_t gfp)
+{
+ return folio_charge_cgroup(page_folio(page), mm, gfp);
+}
+#endif
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 7939e4e9118d..69638f84d11b 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -6503,10 +6503,9 @@ void mem_cgroup_calculate_protection(struct mem_cgroup *root,
atomic_long_read(&parent->memory.children_low_usage)));
}
-static int __mem_cgroup_charge(struct page *page, struct mem_cgroup *memcg,
+static int __mem_cgroup_charge(struct folio *folio, struct mem_cgroup *memcg,
gfp_t gfp)
{
- struct folio *folio = page_folio(page);
unsigned int nr_pages = folio_nr_pages(folio);
int ret;
@@ -6519,26 +6518,26 @@ static int __mem_cgroup_charge(struct page *page, struct mem_cgroup *memcg,
local_irq_disable();
mem_cgroup_charge_statistics(memcg, nr_pages);
- memcg_check_events(memcg, page);
+ memcg_check_events(memcg, &folio->page);
local_irq_enable();
out:
return ret;
}
/**
- * mem_cgroup_charge - charge a newly allocated page to a cgroup
- * @page: page to charge
- * @mm: mm context of the victim
- * @gfp_mask: reclaim mode
+ * folio_charge_cgroup - Charge a newly allocated folio to a cgroup.
+ * @folio: Folio to charge.
+ * @mm: mm context of the allocating task.
+ * @gfp: reclaim mode
*
- * Try to charge @page to the memcg that @mm belongs to, reclaiming
- * pages according to @gfp_mask if necessary.
+ * Try to charge @folio to the memcg that @mm belongs to, reclaiming
+ * pages according to @gfp if necessary.
*
- * Do not use this for pages allocated for swapin.
+ * Do not use this for folios allocated for swapin.
*
* Returns 0 on success. Otherwise, an error code is returned.
*/
-int mem_cgroup_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask)
+int folio_charge_cgroup(struct folio *folio, struct mm_struct *mm, gfp_t gfp)
{
struct mem_cgroup *memcg;
int ret;
@@ -6547,7 +6546,7 @@ int mem_cgroup_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask)
return 0;
memcg = get_mem_cgroup_from_mm(mm);
- ret = __mem_cgroup_charge(page, memcg, gfp_mask);
+ ret = __mem_cgroup_charge(folio, memcg, gfp);
css_put(&memcg->css);
return ret;
@@ -6568,6 +6567,7 @@ int mem_cgroup_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask)
int mem_cgroup_swapin_charge_page(struct page *page, struct mm_struct *mm,
gfp_t gfp, swp_entry_t entry)
{
+ struct folio *folio = page_folio(page);
struct mem_cgroup *memcg;
unsigned short id;
int ret;
@@ -6582,7 +6582,7 @@ int mem_cgroup_swapin_charge_page(struct page *page, struct mm_struct *mm,
memcg = get_mem_cgroup_from_mm(mm);
rcu_read_unlock();
- ret = __mem_cgroup_charge(page, memcg, gfp);
+ ret = __mem_cgroup_charge(folio, memcg, gfp);
css_put(&memcg->css);
return ret;
--
2.30.2
