diff options
| -rw-r--r-- | Documentation/filesystems/proc.rst | 5 | ||||
| -rw-r--r-- | fs/proc/task_mmu.c | 7 |
2 files changed, 11 insertions, 1 deletions
diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst index 09f0aed5a08b..1aa190017f79 100644 --- a/Documentation/filesystems/proc.rst +++ b/Documentation/filesystems/proc.rst @@ -686,6 +686,11 @@ Where: node locality page counters (N0 == node0, N1 == node1, ...) and the kernel page size, in KB, that is backing the mapping up. +Note that some kernel configurations do not track the precise number of times +a page part of a larger allocation (e.g., THP) is mapped. In these +configurations, "mapmax" might corresponds to the average number of mappings +per page in such a larger allocation instead. + 1.2 Kernel data --------------- diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 8192cbe4f356..dc4f819d1549 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -2863,7 +2863,12 @@ static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty, unsigned long nr_pages) { struct folio *folio = page_folio(page); - int count = folio_precise_page_mapcount(folio, page); + int count; + + if (IS_ENABLED(CONFIG_PAGE_MAPCOUNT)) + count = folio_precise_page_mapcount(folio, page); + else + count = folio_average_page_mapcount(folio); md->pages += nr_pages; if (pte_dirty || folio_test_dirty(folio)) |