* [PATCH v3 1/2] mm: move mm counter updating out of set_pte_range()
2024-04-12 6:47 [PATCH v3 0/2] mm: batch mm counter updating in filemap_map_pages() Kefeng Wang
@ 2024-04-12 6:47 ` Kefeng Wang
2024-04-12 6:47 ` [PATCH v3 2/2] mm: filemap: batch mm counter updating in filemap_map_pages() Kefeng Wang
2024-04-12 23:12 ` [PATCH v3 0/2] mm: " Andrew Morton
2 siblings, 0 replies; 6+ messages in thread
From: Kefeng Wang @ 2024-04-12 6:47 UTC (permalink / raw)
To: Andrew Morton
Cc: Matthew Wilcox (Oracle), linux-mm, linux-fsdevel, Kefeng Wang
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().
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
mm/filemap.c | 4 ++++
mm/memory.c | 8 +++++---
2 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index 92e2d43e4c9d..04b813f0146c 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -3540,6 +3540,8 @@ 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;
@@ -3554,6 +3556,7 @@ static vm_fault_t filemap_map_folio_range(struct vm_fault *vmf,
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;
@@ -3590,6 +3593,7 @@ 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;
diff --git a/mm/memory.c b/mm/memory.c
index 78422d1c7381..fdfe965f32e4 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4685,12 +4685,10 @@ 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);
@@ -4727,9 +4725,11 @@ 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;
@@ -4765,8 +4765,10 @@ 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);
--
2.41.0
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v3 2/2] mm: filemap: batch mm counter updating in filemap_map_pages()
2024-04-12 6:47 [PATCH v3 0/2] mm: batch mm counter updating in filemap_map_pages() Kefeng Wang
2024-04-12 6:47 ` [PATCH v3 1/2] mm: move mm counter updating out of set_pte_range() Kefeng Wang
@ 2024-04-12 6:47 ` Kefeng Wang
2024-04-12 23:12 ` [PATCH v3 0/2] mm: " Andrew Morton
2 siblings, 0 replies; 6+ messages in thread
From: Kefeng Wang @ 2024-04-12 6:47 UTC (permalink / raw)
To: Andrew Morton
Cc: Matthew Wilcox (Oracle), linux-mm, linux-fsdevel, Kefeng Wang
Like copy_pte_range()/zap_pte_range(), make mm counter batch updating
in filemap_map_pages(), since folios type are same(MM_SHMEMPAGES or
MM_FILEPAGES) in filemap_map_pages(), only check the first folio type
is enough, the 'lat_pagefault -P 1 file' test from lmbench shows 12%
improvement, and the percpu_counter_add_batch() is gone from perf flame
graph.
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
mm/filemap.c | 21 ++++++++++++---------
1 file changed, 12 insertions(+), 9 deletions(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index 04b813f0146c..531af4acc667 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -3506,7 +3506,7 @@ static struct folio *next_uptodate_folio(struct xa_state *xas,
static vm_fault_t filemap_map_folio_range(struct vm_fault *vmf,
struct folio *folio, unsigned long start,
unsigned long addr, unsigned int nr_pages,
- unsigned int *mmap_miss)
+ unsigned long *rss, unsigned int *mmap_miss)
{
vm_fault_t ret = 0;
struct page *page = folio_page(folio, start);
@@ -3540,8 +3540,7 @@ 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);
+ *rss += count;
folio_ref_add(folio, count);
if (in_range(vmf->address, addr, count * PAGE_SIZE))
ret = VM_FAULT_NOPAGE;
@@ -3556,7 +3555,7 @@ static vm_fault_t filemap_map_folio_range(struct vm_fault *vmf,
if (count) {
set_pte_range(vmf, folio, page, count, addr);
- add_mm_counter(vmf->vma->vm_mm, mm_counter_file(folio), count);
+ *rss += count;
folio_ref_add(folio, count);
if (in_range(vmf->address, addr, count * PAGE_SIZE))
ret = VM_FAULT_NOPAGE;
@@ -3569,7 +3568,7 @@ static vm_fault_t filemap_map_folio_range(struct vm_fault *vmf,
static vm_fault_t filemap_map_order0_folio(struct vm_fault *vmf,
struct folio *folio, unsigned long addr,
- unsigned int *mmap_miss)
+ unsigned long *rss, unsigned int *mmap_miss)
{
vm_fault_t ret = 0;
struct page *page = &folio->page;
@@ -3593,7 +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);
+ (*rss)++;
folio_ref_inc(folio);
return ret;
@@ -3610,7 +3609,8 @@ vm_fault_t filemap_map_pages(struct vm_fault *vmf,
XA_STATE(xas, &mapping->i_pages, start_pgoff);
struct folio *folio;
vm_fault_t ret = 0;
- unsigned int nr_pages = 0, mmap_miss = 0, mmap_miss_saved;
+ unsigned long rss = 0;
+ unsigned int nr_pages = 0, mmap_miss = 0, mmap_miss_saved, folio_type;
rcu_read_lock();
folio = next_uptodate_folio(&xas, mapping, end_pgoff);
@@ -3629,6 +3629,8 @@ vm_fault_t filemap_map_pages(struct vm_fault *vmf,
folio_put(folio);
goto out;
}
+
+ folio_type = mm_counter_file(folio);
do {
unsigned long end;
@@ -3640,15 +3642,16 @@ vm_fault_t filemap_map_pages(struct vm_fault *vmf,
if (!folio_test_large(folio))
ret |= filemap_map_order0_folio(vmf,
- folio, addr, &mmap_miss);
+ folio, addr, &rss, &mmap_miss);
else
ret |= filemap_map_folio_range(vmf, folio,
xas.xa_index - folio->index, addr,
- nr_pages, &mmap_miss);
+ nr_pages, &rss, &mmap_miss);
folio_unlock(folio);
folio_put(folio);
} while ((folio = next_uptodate_folio(&xas, mapping, end_pgoff)) != NULL);
+ add_mm_counter(vma->vm_mm, folio_type, rss);
pte_unmap_unlock(vmf->pte, vmf->ptl);
out:
rcu_read_unlock();
--
2.41.0
^ permalink raw reply related [flat|nested] 6+ messages in thread