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-rw-r--r--include/linux/pagemap.h10
-rw-r--r--mm/filemap.c61
-rw-r--r--mm/huge_memory.c18
-rw-r--r--mm/khugepaged.c12
-rw-r--r--mm/migrate.c8
-rw-r--r--mm/shmem.c19
6 files changed, 72 insertions, 56 deletions
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 6e038811f4c8..704cb1b4b15d 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -1125,16 +1125,6 @@ static inline unsigned int __readahead_batch(struct readahead_control *rac,
VM_BUG_ON_PAGE(PageTail(page), page);
array[i++] = page;
rac->_batch_count += thp_nr_pages(page);
-
- /*
- * The page cache isn't using multi-index entries yet,
- * so the xas cursor needs to be manually moved to the
- * next index. This can be removed once the page cache
- * is converted.
- */
- if (PageHead(page))
- xas_set(&xas, rac->_index + rac->_batch_count);
-
if (i == array_sz)
break;
}
diff --git a/mm/filemap.c b/mm/filemap.c
index 9d3bae3e36c3..33077c264d79 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -135,7 +135,6 @@ static void page_cache_delete(struct address_space *mapping,
}
VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
- VM_BUG_ON_FOLIO(nr != 1 && shadow, folio);
xas_store(&xas, shadow);
xas_init_marks(&xas);
@@ -286,7 +285,7 @@ static void page_cache_delete_batch(struct address_space *mapping,
struct folio_batch *fbatch)
{
XA_STATE(xas, &mapping->i_pages, fbatch->folios[0]->index);
- int total_pages = 0;
+ long total_pages = 0;
int i = 0;
struct folio *folio;
@@ -313,18 +312,12 @@ static void page_cache_delete_batch(struct address_space *mapping,
WARN_ON_ONCE(!folio_test_locked(folio));
- if (folio->index == xas.xa_index)
- folio->mapping = NULL;
+ folio->mapping = NULL;
/* Leave folio->index set: truncation lookup relies on it */
- /*
- * Move to the next folio in the batch if this is a regular
- * folio or the index is of the last sub-page of this folio.
- */
- if (folio->index + folio_nr_pages(folio) - 1 == xas.xa_index)
- i++;
+ i++;
xas_store(&xas, NULL);
- total_pages++;
+ total_pages += folio_nr_pages(folio);
}
mapping->nrpages -= total_pages;
}
@@ -2089,24 +2082,27 @@ unsigned find_lock_entries(struct address_space *mapping, pgoff_t start,
indices[fbatch->nr] = xas.xa_index;
if (!folio_batch_add(fbatch, folio))
break;
- goto next;
+ continue;
unlock:
folio_unlock(folio);
put:
folio_put(folio);
-next:
- if (!xa_is_value(folio) && folio_test_large(folio)) {
- xas_set(&xas, folio->index + folio_nr_pages(folio));
- /* Did we wrap on 32-bit? */
- if (!xas.xa_index)
- break;
- }
}
rcu_read_unlock();
return folio_batch_count(fbatch);
}
+static inline
+bool folio_more_pages(struct folio *folio, pgoff_t index, pgoff_t max)
+{
+ if (!folio_test_large(folio) || folio_test_hugetlb(folio))
+ return false;
+ if (index >= max)
+ return false;
+ return index < folio->index + folio_nr_pages(folio) - 1;
+}
+
/**
* find_get_pages_range - gang pagecache lookup
* @mapping: The address_space to search
@@ -2145,11 +2141,17 @@ unsigned find_get_pages_range(struct address_space *mapping, pgoff_t *start,
if (xa_is_value(folio))
continue;
+again:
pages[ret] = folio_file_page(folio, xas.xa_index);
if (++ret == nr_pages) {
*start = xas.xa_index + 1;
goto out;
}
+ if (folio_more_pages(folio, xas.xa_index, end)) {
+ xas.xa_index++;
+ folio_ref_inc(folio);
+ goto again;
+ }
}
/*
@@ -2207,9 +2209,15 @@ unsigned find_get_pages_contig(struct address_space *mapping, pgoff_t index,
if (unlikely(folio != xas_reload(&xas)))
goto put_page;
- pages[ret] = &folio->page;
+again:
+ pages[ret] = folio_file_page(folio, xas.xa_index);
if (++ret == nr_pages)
break;
+ if (folio_more_pages(folio, xas.xa_index, ULONG_MAX)) {
+ xas.xa_index++;
+ folio_ref_inc(folio);
+ goto again;
+ }
continue;
put_page:
folio_put(folio);
@@ -2334,8 +2342,7 @@ static void filemap_get_read_batch(struct address_space *mapping,
break;
if (folio_test_readahead(folio))
break;
- xas.xa_index = folio->index + folio_nr_pages(folio) - 1;
- xas.xa_offset = (xas.xa_index >> xas.xa_shift) & XA_CHUNK_MASK;
+ xas_advance(&xas, folio->index + folio_nr_pages(folio) - 1);
continue;
put_folio:
folio_put(folio);
@@ -3284,6 +3291,7 @@ vm_fault_t filemap_map_pages(struct vm_fault *vmf,
addr = vma->vm_start + ((start_pgoff - vma->vm_pgoff) << PAGE_SHIFT);
vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd, addr, &vmf->ptl);
do {
+again:
page = folio_file_page(folio, xas.xa_index);
if (PageHWPoison(page))
goto unlock;
@@ -3305,9 +3313,18 @@ vm_fault_t filemap_map_pages(struct vm_fault *vmf,
do_set_pte(vmf, page, addr);
/* no need to invalidate: a not-present page won't be cached */
update_mmu_cache(vma, addr, vmf->pte);
+ if (folio_more_pages(folio, xas.xa_index, end_pgoff)) {
+ xas.xa_index++;
+ folio_ref_inc(folio);
+ goto again;
+ }
folio_unlock(folio);
continue;
unlock:
+ if (folio_more_pages(folio, xas.xa_index, end_pgoff)) {
+ xas.xa_index++;
+ goto again;
+ }
folio_unlock(folio);
folio_put(folio);
} while ((folio = next_map_page(mapping, &xas, end_pgoff)) != NULL);
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index e5483347291c..f58524394dc1 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2614,6 +2614,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
{
struct page *head = compound_head(page);
struct deferred_split *ds_queue = get_deferred_split_queue(head);
+ XA_STATE(xas, &head->mapping->i_pages, head->index);
struct anon_vma *anon_vma = NULL;
struct address_space *mapping = NULL;
int extra_pins, ret;
@@ -2652,6 +2653,13 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
goto out;
}
+ xas_split_alloc(&xas, head, compound_order(head),
+ mapping_gfp_mask(mapping) & GFP_RECLAIM_MASK);
+ if (xas_error(&xas)) {
+ ret = xas_error(&xas);
+ goto out;
+ }
+
anon_vma = NULL;
i_mmap_lock_read(mapping);
@@ -2681,13 +2689,12 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
/* block interrupt reentry in xa_lock and spinlock */
local_irq_disable();
if (mapping) {
- XA_STATE(xas, &mapping->i_pages, page_index(head));
-
/*
* Check if the head page is present in page cache.
* We assume all tail are present too, if head is there.
*/
- xa_lock(&mapping->i_pages);
+ xas_lock(&xas);
+ xas_reset(&xas);
if (xas_load(&xas) != head)
goto fail;
}
@@ -2703,6 +2710,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
if (mapping) {
int nr = thp_nr_pages(head);
+ xas_split(&xas, head, thp_order(head));
if (PageSwapBacked(head)) {
__mod_lruvec_page_state(head, NR_SHMEM_THPS,
-nr);
@@ -2719,7 +2727,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
spin_unlock(&ds_queue->split_queue_lock);
fail:
if (mapping)
- xa_unlock(&mapping->i_pages);
+ xas_unlock(&xas);
local_irq_enable();
remap_page(head, thp_nr_pages(head));
ret = -EBUSY;
@@ -2733,6 +2741,8 @@ out_unlock:
if (mapping)
i_mmap_unlock_read(mapping);
out:
+ /* Free any memory we didn't use */
+ xas_nomem(&xas, 0);
count_vm_event(!ret ? THP_SPLIT_PAGE : THP_SPLIT_PAGE_FAILED);
return ret;
}
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index e99101162f1a..2e1911cc3466 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1667,7 +1667,10 @@ static void collapse_file(struct mm_struct *mm,
}
count_memcg_page_event(new_page, THP_COLLAPSE_ALLOC);
- /* This will be less messy when we use multi-index entries */
+ /*
+ * Ensure we have slots for all the pages in the range. This is
+ * almost certainly a no-op because most of the pages must be present
+ */
do {
xas_lock_irq(&xas);
xas_create_range(&xas);
@@ -1892,6 +1895,9 @@ out_unlock:
__mod_lruvec_page_state(new_page, NR_SHMEM, nr_none);
}
+ /* Join all the small entries into a single multi-index entry */
+ xas_set_order(&xas, start, HPAGE_PMD_ORDER);
+ xas_store(&xas, new_page);
xa_locked:
xas_unlock_irq(&xas);
xa_unlocked:
@@ -2013,6 +2019,10 @@ static void khugepaged_scan_file(struct mm_struct *mm,
continue;
}
+ /*
+ * XXX: khugepaged should compact smaller compound pages
+ * into a PMD sized page
+ */
if (PageTransCompound(page)) {
result = SCAN_PAGE_COMPOUND;
break;
diff --git a/mm/migrate.c b/mm/migrate.c
index 311638177536..7079e6b7dbe7 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -433,14 +433,6 @@ int folio_migrate_mapping(struct address_space *mapping,
}
xas_store(&xas, newfolio);
- if (nr > 1) {
- int i;
-
- for (i = 1; i < nr; i++) {
- xas_next(&xas);
- xas_store(&xas, newfolio);
- }
- }
/*
* Drop cache reference from old page by unfreezing
diff --git a/mm/shmem.c b/mm/shmem.c
index e4c9e5c7081f..28d627444a24 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -694,7 +694,6 @@ static int shmem_add_to_page_cache(struct page *page,
struct mm_struct *charge_mm)
{
XA_STATE_ORDER(xas, &mapping->i_pages, index, compound_order(page));
- unsigned long i = 0;
unsigned long nr = compound_nr(page);
int error;
@@ -721,20 +720,18 @@ static int shmem_add_to_page_cache(struct page *page,
cgroup_throttle_swaprate(page, gfp);
do {
- void *entry;
xas_lock_irq(&xas);
- entry = xas_find_conflict(&xas);
- if (entry != expected)
+ if (expected != xas_find_conflict(&xas)) {
+ xas_set_err(&xas, -EEXIST);
+ goto unlock;
+ }
+ if (expected && xas_find_conflict(&xas)) {
xas_set_err(&xas, -EEXIST);
- xas_create_range(&xas);
- if (xas_error(&xas))
goto unlock;
-next:
- xas_store(&xas, page);
- if (++i < nr) {
- xas_next(&xas);
- goto next;
}
+ xas_store(&xas, page);
+ if (xas_error(&xas))
+ goto unlock;
if (PageTransHuge(page)) {
count_vm_event(THP_FILE_ALLOC);
__mod_lruvec_page_state(page, NR_SHMEM_THPS, nr);
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-11-30 03:53:11 +0000