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Message-ID: <153d0e8e-c860-4221-bcb0-71b46f17e2d5@huawei.com>
Date: Sat, 18 Nov 2023 10:43:01 +0800
From: Kefeng Wang <wangkefeng.wang@...wei.com>
To: Andrew Morton <akpm@...ux-foundation.org>
CC: <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
Matthew Wilcox <willy@...radead.org>,
David Hildenbrand <david@...hat.com>,
Sidhartha Kumar <sidhartha.kumar@...cle.com>,
Vishal Moola <vishal.moola@...il.com>
Subject: Re: [PATCH v3 5/5] mm: memory: use folio_prealloc() in wp_page_copy()
On 2023/11/18 10:32, Kefeng Wang wrote:
> Use folio_prealloc() helper to simplify code a bit.
>
Forget to add RB of Vishal,adding it
Reviewed-by: Vishal Moola (Oracle) <vishal.moola@...il.com>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---
> mm/memory.c | 22 +++++++---------------
> 1 file changed, 7 insertions(+), 15 deletions(-)
>
> diff --git a/mm/memory.c b/mm/memory.c
> index 868a2fc54549..98d9c7094cab 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -3112,6 +3112,7 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
> int page_copied = 0;
> struct mmu_notifier_range range;
> vm_fault_t ret;
> + bool pfn_is_zero;
>
> delayacct_wpcopy_start();
>
> @@ -3121,16 +3122,13 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
> if (unlikely(ret))
> goto out;
>
> - if (is_zero_pfn(pte_pfn(vmf->orig_pte))) {
> - new_folio = vma_alloc_zeroed_movable_folio(vma, vmf->address);
> - if (!new_folio)
> - goto oom;
> - } else {
> + pfn_is_zero = is_zero_pfn(pte_pfn(vmf->orig_pte));
> + new_folio = folio_prealloc(mm, vma, vmf->address, pfn_is_zero);
> + if (!new_folio)
> + goto oom;
> +
> + if (!pfn_is_zero) {
> int err;
> - new_folio = vma_alloc_folio(GFP_HIGHUSER_MOVABLE, 0, vma,
> - vmf->address, false);
> - if (!new_folio)
> - goto oom;
>
> err = __wp_page_copy_user(&new_folio->page, vmf->page, vmf);
> if (err) {
> @@ -3151,10 +3149,6 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
> kmsan_copy_page_meta(&new_folio->page, vmf->page);
> }
>
> - if (mem_cgroup_charge(new_folio, mm, GFP_KERNEL))
> - goto oom_free_new;
> - folio_throttle_swaprate(new_folio, GFP_KERNEL);
> -
> __folio_mark_uptodate(new_folio);
>
> mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, mm,
> @@ -3253,8 +3247,6 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
>
> delayacct_wpcopy_end();
> return 0;
> -oom_free_new:
> - folio_put(new_folio);
> oom:
> ret = VM_FAULT_OOM;
> out:
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