kevin/linux
1
Fork 0
Code

mm: huge_memory: add the missing folio_test_pmd_mappable() for THP split statistics

Browse Source 
Now the mTHP can also be split or added into the deferred list, so add
folio_test_pmd_mappable() validation for PMD mapped THP, to avoid
confusion with PMD mapped THP related statistics.

[baolin.wang@linux.alibaba.com: check THP earlier in case folio is split, per Lance]
  Link: https://lkml.kernel.org/r/b99f8cb14bc85fdb6ab43721d1331cb5ebed2581.1713771041.git.baolin.wang@linux.alibaba.com
Link: https://lkml.kernel.org/r/a5341defeef27c9ac7b85c97f030f93e4368bbc1.1711694852.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Lance Yang <ioworker0@gmail.com>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Baolin Wang 2024-03-29 14:59:33 +08:00 committed by Andrew Morton
parent d2136d749d
commit 835c3a25aa
1 changed files with 5 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
mm/huge_memory.c
View File

@ -2934,6 +2934,7 @@ int split_huge_page_to_list_to_order(struct page *page, struct list_head *list,
XA_STATE_ORDER(xas, &folio->mapping->i_pages, folio->index, new_order);
struct anon_vma *anon_vma = NULL;
struct address_space *mapping = NULL;
bool is_thp = folio_test_pmd_mappable(folio);
int extra_pins, ret;
pgoff_t end;
bool is_hzp;
@ -3112,6 +3113,7 @@ out_unlock:
i_mmap_unlock_read(mapping);
out:
xas_destroy(&xas);
if (is_thp)
count_vm_event(!ret ? THP_SPLIT_PAGE : THP_SPLIT_PAGE_FAILED);
return ret;
}
@ -3174,6 +3176,7 @@ void deferred_split_folio(struct folio *folio)
spin_lock_irqsave(&ds_queue->split_queue_lock, flags);
if (list_empty(&folio->_deferred_list)) {
if (folio_test_pmd_mappable(folio))
count_vm_event(THP_DEFERRED_SPLIT_PAGE);
list_add_tail(&folio->_deferred_list, &ds_queue->split_queue);
ds_queue->split_queue_len++;