From 77d075221ae777296e2b18a0a4f5fea6f75daf2c Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Fri, 20 Dec 2024 08:47:43 -0700 Subject: [PATCH] mm/readahead: add readahead_control->dropbehind member If ractl->dropbehind is set to true, then folios created are marked as dropbehind as well. Link: https://lkml.kernel.org/r/20241220154831.1086649-6-axboe@kernel.dk Signed-off-by: Jens Axboe Reviewed-by: Kirill A. Shutemov Cc: Brian Foster Cc: Chris Mason Cc: Christoph Hellwig Cc: Johannes Weiner Cc: Matthew Wilcox (Oracle) Signed-off-by: Andrew Morton --- include/linux/pagemap.h | 1 + mm/readahead.c | 8 +++++++- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index fc2e1319c7bb..d53c49abead6 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -1358,6 +1358,7 @@ struct readahead_control { pgoff_t _index; unsigned int _nr_pages; unsigned int _batch_count; + bool dropbehind; bool _workingset; unsigned long _pflags; }; diff --git a/mm/readahead.c b/mm/readahead.c index 722b541c7137..6a4e96b69702 100644 --- a/mm/readahead.c +++ b/mm/readahead.c @@ -181,7 +181,13 @@ static void read_pages(struct readahead_control *rac) static struct folio *ractl_alloc_folio(struct readahead_control *ractl, gfp_t gfp_mask, unsigned int order) { - return filemap_alloc_folio(gfp_mask, order); + struct folio *folio; + + folio = filemap_alloc_folio(gfp_mask, order); + if (folio && ractl->dropbehind) + __folio_set_dropbehind(folio); + + return folio; } /** -- 2.25.1