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mm: move mm counter updating out of set_pte_range()

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Patch series "mm: batch mm counter updating in filemap_map_pages()", v3.

Let's batch mm counter updating to accelerate filemap_map_pages().


This patch (of 2):

In order to support batch mm counter updating in filemap_map_pages(), move
mm counter updating out of set_pte_range(), the folios are file from
filemap, and distinguish folios by vmf->flags and vma->vm_flags from
another caller finish_fault().

Link: https://lkml.kernel.org/r/20240412064751.119015-1-wangkefeng.wang@huawei.com
Link: https://lkml.kernel.org/r/20240412064751.119015-2-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kefeng Wang 2024-04-12 14:47:50 +08:00 committed by Andrew Morton
parent a14421ae2a
commit 1f2d8b4421
2 changed files with 9 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
mm/filemap.c
View File

@ -3539,6 +3539,8 @@ static vm_fault_t filemap_map_folio_range(struct vm_fault *vmf,
skip:
if (count) {
set_pte_range(vmf, folio, page, count, addr);
add_mm_counter(vmf->vma->vm_mm, mm_counter_file(folio),
count);
folio_ref_add(folio, count);
if (in_range(vmf->address, addr, count * PAGE_SIZE))
ret = VM_FAULT_NOPAGE;
@ -3553,6 +3555,7 @@ skip:
if (count) {
set_pte_range(vmf, folio, page, count, addr);
add_mm_counter(vmf->vma->vm_mm, mm_counter_file(folio), count);
folio_ref_add(folio, count);
if (in_range(vmf->address, addr, count * PAGE_SIZE))
ret = VM_FAULT_NOPAGE;
@ -3589,6 +3592,7 @@ static vm_fault_t filemap_map_order0_folio(struct vm_fault *vmf,
ret = VM_FAULT_NOPAGE;
set_pte_range(vmf, folio, page, 1, addr);
add_mm_counter(vmf->vma->vm_mm, mm_counter_file(folio), 1);
folio_ref_inc(folio);
return ret;

8
mm/memory.c
View File

@ -4687,12 +4687,10 @@ void set_pte_range(struct vm_fault *vmf, struct folio *folio,
entry = pte_mkuffd_wp(entry);
/* copy-on-write page */
if (write && !(vma->vm_flags & VM_SHARED)) {
add_mm_counter(vma->vm_mm, MM_ANONPAGES, nr);
VM_BUG_ON_FOLIO(nr != 1, folio);
folio_add_new_anon_rmap(folio, vma, addr);
folio_add_lru_vma(folio, vma);
} else {
add_mm_counter(vma->vm_mm, mm_counter_file(folio), nr);
folio_add_file_rmap_ptes(folio, page, nr, vma);
}
set_ptes(vma->vm_mm, addr, vmf->pte, entry, nr);
@ -4729,9 +4727,11 @@ vm_fault_t finish_fault(struct vm_fault *vmf)
struct vm_area_struct *vma = vmf->vma;
struct page *page;
vm_fault_t ret;
bool is_cow = (vmf->flags & FAULT_FLAG_WRITE) &&
!(vma->vm_flags & VM_SHARED);
/* Did we COW the page? */
if ((vmf->flags & FAULT_FLAG_WRITE) && !(vma->vm_flags & VM_SHARED))
if (is_cow)
page = vmf->cow_page;
else
page = vmf->page;
@ -4767,8 +4767,10 @@ vm_fault_t finish_fault(struct vm_fault *vmf)
/* Re-check under ptl */
if (likely(!vmf_pte_changed(vmf))) {
struct folio *folio = page_folio(page);
int type = is_cow ? MM_ANONPAGES : mm_counter_file(folio);
set_pte_range(vmf, folio, page, 1, vmf->address);
add_mm_counter(vma->vm_mm, type, 1);
ret = 0;
} else {
update_mmu_tlb(vma, vmf->address, vmf->pte);