page_counter-reduce-struct-page_counter-size.patch removed from -mm tree

The quilt patch titled
Subject: page_counter: reduce struct page_counter size
has been removed from the -mm tree. Its filename was
page_counter-reduce-struct-page_counter-size.patch

This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Shakeel Butt <[email protected]>
Subject: page_counter: reduce struct page_counter size
Date: Thu, 27 Feb 2025 23:58:08 -0800

The struct page_counter has explicit padding for better cache alignment. The commit c6f53ed8f213a ("mm, memcg: cg2 memory{.swap,}.peak write handlers") added a field to the struct page_counter and accidently increased its size. Let's move the failcnt field which is v1-only field to the same cacheline of usage to reduce the size of struct page_counter.

---

 include/linux/page_counter.h |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

@@ -9,10 +9,12 @@
 
 struct page_counter {
 	/*
-	 * Make sure 'usage' does not share cacheline with any other field. The
-	 * memcg->memory.usage is a hot member of struct mem_cgroup.
+	 * Make sure 'usage' does not share cacheline with any other field in
+	 * v2. The memcg->memory.usage is a hot member of struct mem_cgroup.
 	 */
 	atomic_long_t usage;
+	unsigned long failcnt; /* v1-only field */
+
 	CACHELINE_PADDING(_pad1_);
 
 	/* effective memory.min and memory.min usage tracking */

@@ -28,7 +30,6 @@ struct page_counter {
 	unsigned long watermark;
 	/* Latest cg2 reset watermark */
 	unsigned long local_watermark;
-	unsigned long failcnt; /* v1-only field */
 
 	/* Keep all the read most fields in a separete cacheline. */
 	CACHELINE_PADDING(_pad2_);

_

Patches currently in -mm which might be from [email protected] are

memcg-add-hierarchical-effective-limits-for-v2.patch memcg-avoid-refill_stock-for-root-memcg.patch memcg-move-do_memsw_account-to-config_memcg_v1.patch