| Message ID | 20231118023232.1409103-6-wangkefeng.wang@huawei.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | mm: cleanup and use more folio in page fault | expand |
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@gmail.com> > Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.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:
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:
Use folio_prealloc() helper to simplify code a bit. Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> --- mm/memory.c | 22 +++++++--------------- 1 file changed, 7 insertions(+), 15 deletions(-)