Messages in this thread Patch in this message | | | From | Matthew Wilcox <> | Subject | [PATCH v6 04/51] mm: Move PageDoubleMap bit | Date | Wed, 10 Jun 2020 13:12:58 -0700 |
| |
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
PG_private_2 is defined as being PF_ANY (applicable to tail pages as well as regular & head pages). That means that the first tail page of a double-map page will appear to have Private2 set. Use the Workingset bit instead which is defined as PF_HEAD so any attempt to access the Workingset bit on a tail page will redirect to the head page's Workingset bit.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> --- include/linux/page-flags.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 222f6f7b2bb3..de6e0696f55c 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -164,7 +164,7 @@ enum pageflags { PG_slob_free = PG_private, /* Compound pages. Stored in first tail page's flags */ - PG_double_map = PG_private_2, + PG_double_map = PG_workingset, /* non-lru isolated movable page */ PG_isolated = PG_reclaim, -- 2.26.2
| |