The patch titled Subject: mm: memory: move mem_cgroup_charge() into alloc_anon_folio() has been added to the -mm mm-unstable branch. Its filename is mm-memory-move-mem_cgroup_charge-into-alloc_anon_folio.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memory-move-mem_cgroup_charge-into-alloc_anon_folio.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx> Subject: mm: memory: move mem_cgroup_charge() into alloc_anon_folio() Date: Wed, 17 Jan 2024 18:39:54 +0800 mem_cgroup_charge() uses the GFP flags in a fairly sophisticated way. In addition to checking gfpflags_allow_blocking(), it pays attention to __GFP_NORETRY and __GFP_RETRY_MAYFAIL to ensure that processes within this memcg do not exceed their quotas. Using the same GFP flags ensures that we handle large anonymous folios correctly, including falling back to smaller orders when there is plenty of memory available in the system but this memcg is close to its limits. Link: https://lkml.kernel.org/r/20240117103954.2756050-1-wangkefeng.wang@xxxxxxxxxx Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx> Cc: David Hildenbrand <david@xxxxxxxxxx> Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> Cc: Ryan Roberts <ryan.roberts@xxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxx> Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: Shakeel Butt <shakeelb@xxxxxxxxxx> Cc: Muchun Song <songmuchun@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/memory.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) --- a/mm/memory.c~mm-memory-move-mem_cgroup_charge-into-alloc_anon_folio +++ a/mm/memory.c @@ -4153,8 +4153,8 @@ static bool pte_range_none(pte_t *pte, i static struct folio *alloc_anon_folio(struct vm_fault *vmf) { -#ifdef CONFIG_TRANSPARENT_HUGEPAGE struct vm_area_struct *vma = vmf->vma; +#ifdef CONFIG_TRANSPARENT_HUGEPAGE unsigned long orders; struct folio *folio; unsigned long addr; @@ -4206,15 +4206,21 @@ static struct folio *alloc_anon_folio(st addr = ALIGN_DOWN(vmf->address, PAGE_SIZE << order); folio = vma_alloc_folio(gfp, order, vma, addr, true); if (folio) { + if (mem_cgroup_charge(folio, vma->vm_mm, gfp)) { + folio_put(folio); + goto next; + } + folio_throttle_swaprate(folio, gfp); clear_huge_page(&folio->page, vmf->address, 1 << order); return folio; } +next: order = next_order(&orders, order); } fallback: #endif - return vma_alloc_zeroed_movable_folio(vmf->vma, vmf->address); + return folio_prealloc(vma->vm_mm, vma, vmf->address, true); } /* @@ -4281,10 +4287,6 @@ static vm_fault_t do_anonymous_page(stru nr_pages = folio_nr_pages(folio); addr = ALIGN_DOWN(vmf->address, nr_pages * PAGE_SIZE); - if (mem_cgroup_charge(folio, vma->vm_mm, GFP_KERNEL)) - goto oom_free_page; - folio_throttle_swaprate(folio, GFP_KERNEL); - /* * The memory barrier inside __folio_mark_uptodate makes sure that * preceding stores to the page contents become visible before @@ -4338,8 +4340,6 @@ unlock: release: folio_put(folio); goto unlock; -oom_free_page: - folio_put(folio); oom: return VM_FAULT_OOM; } _ Patches currently in -mm which might be from wangkefeng.wang@xxxxxxxxxx are mm-memory-use-nth_page-in-clear-copy_subpage.patch s390-use-pfn_swap_entry_folio-in-ptep_zap_swap_entry.patch mm-use-pfn_swap_entry_folio-in-__split_huge_pmd_locked.patch mm-use-pfn_swap_entry_to_folio-in-zap_huge_pmd.patch mm-use-pfn_swap_entry_folio-in-copy_nonpresent_pte.patch mm-convert-to-should_zap_page-to-should_zap_folio.patch mm-convert-to-should_zap_page-to-should_zap_folio-fix.patch mm-convert-mm_counter-to-take-a-folio.patch mm-convert-mm_counter_file-to-take-a-folio.patch mm-memory-move-mem_cgroup_charge-into-alloc_anon_folio.patch