[PATCH v14 040/138] mm/memcg: Convert mem_cgroup_charge() to take a folio

Matthew Wilcox (Oracle)
2021-07-15T04:10:36Z

Convert all callers of mem_cgroup_charge() to call page_folio() on the
page they're currently passing in. Many of them will be converted to
use folios themselves soon.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
include/linux/memcontrol.h | 6 +++---
kernel/events/uprobes.c | 3 ++-
mm/filemap.c | 2 +-
mm/huge_memory.c | 2 +-
mm/khugepaged.c | 4 ++--
mm/ksm.c | 3 ++-
mm/memcontrol.c | 26 +++++++++++++-------------
mm/memory.c | 9 +++++----
mm/migrate.c | 2 +-
mm/shmem.c | 2 +-
mm/userfaultfd.c | 2 +-
11 files changed, 32 insertions(+), 29 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index eabae5874161..fb7b87d8e794 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -704,7 +704,7 @@ static inline bool mem_cgroup_below_min(struct mem_cgroup *memcg)
page_counter_read(&memcg->memory);
}

-int mem_cgroup_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask);
+int mem_cgroup_charge(struct folio *, struct mm_struct *, gfp_t);
int mem_cgroup_swapin_charge_page(struct page *page, struct mm_struct *mm,
gfp_t gfp, swp_entry_t entry);
void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry);
@@ -1190,8 +1190,8 @@ static inline bool mem_cgroup_below_min(struct mem_cgroup *memcg)
return false;
}

-static inline int mem_cgroup_charge(struct page *page, struct mm_struct *mm,
- gfp_t gfp_mask)
+static inline int mem_cgroup_charge(struct folio *folio,
+ struct mm_struct *mm, gfp_t gfp)
{
return 0;
}
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index af24dc3febbe..6357c3580d07 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -167,7 +167,8 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
addr + PAGE_SIZE);

if (new_page) {
- err = mem_cgroup_charge(new_page, vma->vm_mm, GFP_KERNEL);
+ err = mem_cgroup_charge(page_folio(new_page), vma->vm_mm,
+ GFP_KERNEL);
if (err)
return err;
}
diff --git a/mm/filemap.c b/mm/filemap.c
index a5d02ec62eb6..525f69316522 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -872,7 +872,7 @@ noinline int __add_to_page_cache_locked(struct page *page,
page->index = offset;

if (!huge) {
- error = mem_cgroup_charge(page, NULL, gfp);
+ error = mem_cgroup_charge(page_folio(page), NULL, gfp);
if (error)
goto error;
charged = true;
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index afff3ac87067..ecb1fb1f5f3e 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -603,7 +603,7 @@ static vm_fault_t __do_huge_pmd_anonymous_page(struct vm_fault *vmf,

VM_BUG_ON_PAGE(!PageCompound(page), page);

- if (mem_cgroup_charge(page, vma->vm_mm, gfp)) {
+ if (mem_cgroup_charge(page_folio(page), vma->vm_mm, gfp)) {
put_page(page);
count_vm_event(THP_FAULT_FALLBACK);
count_vm_event(THP_FAULT_FALLBACK_CHARGE);
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index b0412be08fa2..8f6d7fdea9f4 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1087,7 +1087,7 @@ static void collapse_huge_page(struct mm_struct *mm,
goto out_nolock;
}

- if (unlikely(mem_cgroup_charge(new_page, mm, gfp))) {
+ if (unlikely(mem_cgroup_charge(page_folio(new_page), mm, gfp))) {
result = SCAN_CGROUP_CHARGE_FAIL;
goto out_nolock;
}
@@ -1658,7 +1658,7 @@ static void collapse_file(struct mm_struct *mm,
goto out;
}

- if (unlikely(mem_cgroup_charge(new_page, mm, gfp))) {
+ if (unlikely(mem_cgroup_charge(page_folio(new_page), mm, gfp))) {
result = SCAN_CGROUP_CHARGE_FAIL;
goto out;
}
diff --git a/mm/ksm.c b/mm/ksm.c
index 3fa9bc8a67cf..23d36b59f997 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -2580,7 +2580,8 @@ struct page *ksm_might_need_to_copy(struct page *page,
return page; /* let do_swap_page report the error */

new_page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address);
- if (new_page && mem_cgroup_charge(new_page, vma->vm_mm, GFP_KERNEL)) {
+ if (new_page &&
+ mem_cgroup_charge(page_folio(new_page), vma->vm_mm, GFP_KERNEL)) {
put_page(new_page);
new_page = NULL;
}
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c2ffad021e09..03283d97b62a 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -6681,10 +6681,9 @@ 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;

@@ -6697,27 +6696,27 @@ 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_to_nid(page));
+ memcg_check_events(memcg, folio_nid(folio));
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
+ * mem_cgroup_charge - 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. if @mm is NULL, try to
+ * Try to charge @folio to the memcg that @mm belongs to, reclaiming
+ * pages according to @gfp if necessary. If @mm is NULL, try to
* charge to the active memcg.
*
- * 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 mem_cgroup_charge(struct folio *folio, struct mm_struct *mm, gfp_t gfp)
{
struct mem_cgroup *memcg;
int ret;
@@ -6726,7 +6725,7 @@ 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;
@@ -6747,6 +6746,7 @@ 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;
@@ -6761,7 +6761,7 @@ 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;
diff --git a/mm/memory.c b/mm/memory.c
index 2f111f9b3dbc..614418e26e2c 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -990,7 +990,7 @@ page_copy_prealloc(struct mm_struct *src_mm, struct vm_area_struct *vma,
if (!new_page)
return NULL;

- if (mem_cgroup_charge(new_page, src_mm, GFP_KERNEL)) {
+ if (mem_cgroup_charge(page_folio(new_page), src_mm, GFP_KERNEL)) {
put_page(new_page);
return NULL;
}
@@ -3019,7 +3019,7 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
}
}

- if (mem_cgroup_charge(new_page, mm, GFP_KERNEL))
+ if (mem_cgroup_charge(page_folio(new_page), mm, GFP_KERNEL))
goto oom_free_new;
cgroup_throttle_swaprate(new_page, GFP_KERNEL);

@@ -3768,7 +3768,7 @@ static vm_fault_t do_anonymous_page(struct vm_fault *vmf)
if (!page)
goto oom;

- if (mem_cgroup_charge(page, vma->vm_mm, GFP_KERNEL))
+ if (mem_cgroup_charge(page_folio(page), vma->vm_mm, GFP_KERNEL))
goto oom_free_page;
cgroup_throttle_swaprate(page, GFP_KERNEL);

@@ -4183,7 +4183,8 @@ static vm_fault_t do_cow_fault(struct vm_fault *vmf)
if (!vmf->cow_page)
return VM_FAULT_OOM;

- if (mem_cgroup_charge(vmf->cow_page, vma->vm_mm, GFP_KERNEL)) {
+ if (mem_cgroup_charge(page_folio(vmf->cow_page), vma->vm_mm,
+ GFP_KERNEL)) {
put_page(vmf->cow_page);
return VM_FAULT_OOM;
}
diff --git a/mm/migrate.c b/mm/migrate.c
index 34a9ad3e0a4f..b5bdae748f82 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2763,7 +2763,7 @@ static void migrate_vma_insert_page(struct migrate_vma *migrate,

if (unlikely(anon_vma_prepare(vma)))
goto abort;
- if (mem_cgroup_charge(page, vma->vm_mm, GFP_KERNEL))
+ if (mem_cgroup_charge(page_folio(page), vma->vm_mm, GFP_KERNEL))
goto abort;

/*
diff --git a/mm/shmem.c b/mm/shmem.c
index 70d9ce294bb4..3931fed5c8d8 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -685,7 +685,7 @@ static int shmem_add_to_page_cache(struct page *page,
page->index = index;

if (!PageSwapCache(page)) {
- error = mem_cgroup_charge(page, charge_mm, gfp);
+ error = mem_cgroup_charge(page_folio(page), charge_mm, gfp);
if (error) {
if (PageTransHuge(page)) {
count_vm_event(THP_FILE_FALLBACK);
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index 0e2132834bc7..5d0f55f3c0ed 100644
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -164,7 +164,7 @@ static int mcopy_atomic_pte(struct mm_struct *dst_mm,
__SetPageUptodate(page);

ret = -ENOMEM;
- if (mem_cgroup_charge(page, dst_mm, GFP_KERNEL))
+ if (mem_cgroup_charge(page_folio(page), dst_mm, GFP_KERNEL))
goto out_release;

ret = mfill_atomic_install_pte(dst_mm, dst_pmd, dst_vma, dst_addr,
--
2.30.2