[PATCH v2 06/29] mm/zsmalloc: make PageZsmalloc() sticky until the page is freed
From: David Hildenbrand <hidden>
Date: 2025-07-04 10:25:48
Also in:
linux-doc, linux-fsdevel, linux-mm, lkml, virtualization
Subsystem:
memory management, the rest, zsmalloc compressed slab memory allocator · Maintainers:
Andrew Morton, Linus Torvalds, Minchan Kim, Sergey Senozhatsky
Let the page freeing code handle clearing the page type. Being able to identify balloon pages until actually freed is a requirement for upcoming movable_ops migration changes. Acked-by: Zi Yan <ziy@nvidia.com> Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org> Acked-by: Harry Yoo <redacted> Reviewed-by: Lorenzo Stoakes <redacted> Signed-off-by: David Hildenbrand <redacted> --- mm/zpdesc.h | 5 ----- mm/zsmalloc.c | 4 ++-- 2 files changed, 2 insertions(+), 7 deletions(-)
diff --git a/mm/zpdesc.h b/mm/zpdesc.h
index 5cb7e3de43952..5763f36039736 100644
--- a/mm/zpdesc.h
+++ b/mm/zpdesc.h@@ -163,11 +163,6 @@ static inline void __zpdesc_set_zsmalloc(struct zpdesc *zpdesc) __SetPageZsmalloc(zpdesc_page(zpdesc)); } -static inline void __zpdesc_clear_zsmalloc(struct zpdesc *zpdesc) -{ - __ClearPageZsmalloc(zpdesc_page(zpdesc)); -} - static inline struct zone *zpdesc_zone(struct zpdesc *zpdesc) { return page_zone(zpdesc_page(zpdesc));
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 7f1431f2be98f..626f09fb27138 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c@@ -244,6 +244,7 @@ static inline void free_zpdesc(struct zpdesc *zpdesc) { struct page *page = zpdesc_page(zpdesc); + /* PageZsmalloc is sticky until the page is freed to the buddy. */ __free_page(page); }
@@ -880,7 +881,7 @@ static void reset_zpdesc(struct zpdesc *zpdesc) ClearPagePrivate(page); zpdesc->zspage = NULL; zpdesc->next = NULL; - __ClearPageZsmalloc(page); + /* PageZsmalloc is sticky until the page is freed to the buddy. */ } static int trylock_zspage(struct zspage *zspage)
@@ -1055,7 +1056,6 @@ static struct zspage *alloc_zspage(struct zs_pool *pool, if (!zpdesc) { while (--i >= 0) { zpdesc_dec_zone_page_state(zpdescs[i]); - __zpdesc_clear_zsmalloc(zpdescs[i]); free_zpdesc(zpdescs[i]); } cache_free_zspage(pool, zspage);
--
2.49.0