diff options
| -rw-r--r-- | mm/page_alloc.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index fc54ef10107b..eb79d2af9de6 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -94,6 +94,18 @@ typedef int __bitwise fpi_t; */ #define FPI_SKIP_REPORT_NOTIFY ((__force fpi_t)BIT(0)) +/* + * Place the (possibly merged) page to the tail of the freelist. Will ignore + * page shuffling (relevant code - e.g., memory onlining - is expected to + * shuffle the whole zone). + * + * Note: No code should rely on this flag for correctness - it's purely + * to allow for optimizations when handing back either fresh pages + * (memory onlining) or untouched pages (page isolation, free page + * reporting). + */ +#define FPI_TO_TAIL ((__force fpi_t)BIT(1)) + /* prevent >1 _updater_ of zone percpu pageset ->high and ->batch fields */ static DEFINE_MUTEX(pcp_batch_high_lock); #define MIN_PERCPU_PAGELIST_FRACTION (8) @@ -1044,7 +1056,9 @@ continue_merging: done_merging: set_page_order(page, order); - if (is_shuffle_order(order)) + if (fpi_flags & FPI_TO_TAIL) + to_tail = true; + else if (is_shuffle_order(order)) to_tail = shuffle_pick_tail(); else to_tail = buddy_merge_likely(pfn, buddy_pfn, page, order); @@ -3306,7 +3320,7 @@ void __putback_isolated_page(struct page *page, unsigned int order, int mt) /* Return isolated page to tail of freelist. */ __free_one_page(page, page_to_pfn(page), zone, order, mt, - FPI_SKIP_REPORT_NOTIFY); + FPI_SKIP_REPORT_NOTIFY | FPI_TO_TAIL); } /* |