diff options
| author | Baolin Wang <[email protected]> | 2024-08-20 17:49:13 +0800 |
|---|---|---|
| committer | Andrew Morton <[email protected]> | 2024-09-03 21:15:39 -0700 |
| commit | fda6d4de064a9d37414df36d45836898fff5e165 (patch) | |
| tree | 51805edc4ca6d2f323456f28721974d3ed877ed8 | |
| parent | ef5f379de302884b9b7ad9b62587a942a9f0bb55 (diff) | |
mm: khugepaged: expand the is_refcount_suitable() to support file folios
Patch series "support shmem mTHP collapse", v2.
Shmem already supports mTHP allocation[1], and this patchset adds support
for shmem mTHP collapse, as well as adding relevant test cases.
This patch (of 5):
Expand the is_refcount_suitable() to support reference checks for file
folios, as preparation for supporting shmem mTHP collapse.
Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/eae4cb3195ebbb654bfb7967cb7261d4e4e7c7fa.1724140601.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Cc: Barry Song <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Ryan Roberts <[email protected]>
Cc: Yang Shi <[email protected]>
Cc: Zi Yan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
| -rw-r--r-- | mm/khugepaged.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/mm/khugepaged.c b/mm/khugepaged.c index cdd1d8655a76..76f05215ee87 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -546,12 +546,14 @@ static void release_pte_pages(pte_t *pte, pte_t *_pte, static bool is_refcount_suitable(struct folio *folio) { - int expected_refcount; + int expected_refcount = folio_mapcount(folio); - expected_refcount = folio_mapcount(folio); - if (folio_test_swapcache(folio)) + if (!folio_test_anon(folio) || folio_test_swapcache(folio)) expected_refcount += folio_nr_pages(folio); + if (folio_test_private(folio)) + expected_refcount++; + return folio_ref_count(folio) == expected_refcount; } @@ -2285,8 +2287,7 @@ static int hpage_collapse_scan_file(struct mm_struct *mm, unsigned long addr, break; } - if (folio_ref_count(folio) != - 1 + folio_mapcount(folio) + folio_test_private(folio)) { + if (!is_refcount_suitable(folio)) { result = SCAN_PAGE_COUNT; break; } |