linux-kernel - [PATCH 1/2] mm: memcg: drop obsolete cache line padding in struct mem

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Message-ID: <20240701185932.704807-1-roman.gushchin@linux.dev>
Date: Mon,  1 Jul 2024 18:59:31 +0000
From: Roman Gushchin <roman.gushchin@...ux.dev>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Shakeel Butt <shakeel.butt@...ux.dev>
Cc: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>,
	Muchun Song <muchun.song@...ux.dev>,
	Roman Gushchin <roman.gushchin@...ux.dev>
Subject: [PATCH 1/2] mm: memcg: drop obsolete cache line padding in struct mem_cgroup

After the grouping of the cgroup v1-related fields and the
corresponding reorganization of the struct mem_cgroup, the existing
cache line padding doesn't make much sense anymore. Let's drop
it for now and put back to new places, if necessary.

Suggested-by: Shakeel Butt <shakeel.butt@...ux.dev>
Signed-off-by: Roman Gushchin <roman.gushchin@...ux.dev>
---
 include/linux/memcontrol.h | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index d0c9365ff039..8b5b3ddeba05 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -220,8 +220,6 @@ struct mem_cgroup {
 	/* handle for "memory.swap.events" */
 	struct cgroup_file swap_events_file;
 
-	CACHELINE_PADDING(_pad1_);
-
 	/* memory.stat */
 	struct memcg_vmstats	*vmstats;
 
@@ -305,8 +303,6 @@ struct mem_cgroup {
 	bool tcpmem_active;
 	int tcpmem_pressure;
 
-	CACHELINE_PADDING(_pad2_);
-
 	/*
 	 * set > 0 if pages under this cgroup are moving to other cgroup.
 	 */
-- 
2.45.2.803.g4e1b14247a-goog