Roman Gushchin f59adcf593 mm: memcg: add cacheline padding after lruvec in mem_cgroup_per_node ... Oliver Sand reported a performance regression caused by commit 98c9daf5ae ("mm: memcg: guard memcg1-specific members of struct mem_cgroup_per_node"), which puts some fields of the mem_cgroup_per_node structure under the CONFIG_MEMCG_V1 config option. Apparently it causes a false cache sharing between lruvec and lru_zone_size members of the structure. Fix it by adding an explicit padding after the lruvec member. Even though the padding is not required with CONFIG_MEMCG_V1 set, it seems like the introduced memory overhead is not significant enough to warrant another divergence in the mem_cgroup_per_node layout, so the padding is added unconditionally. Link: https://lkml.kernel.org/r/20240723171244.747521-1-roman.gushchin@linux.dev Fixes: 98c9daf5ae ("mm: memcg: guard memcg1-specific members of struct mem_cgroup_per_node") Signed-off-by: Roman Gushchin <roman.gushchin@linux.dev> Reported-by: kernel test robot <oliver.sang@intel.com> Closes: https://lore.kernel.org/oe-lkp/202407121335.31a10cb6-oliver.sang@intel.com Tested-by: Oliver Sang <oliver.sang@intel.com> Acked-by: Shakeel Butt <shakeel.butt@linux.dev> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Muchun Song <muchun.song@linux.dev> Cc: Roman Gushchin <roman.gushchin@linux.dev> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>		2024-07-26 14:33:09 -07:00
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acpi	Driver core changes for 6.11-rc1	2024-07-25 10:42:22 -07:00
asm-generic	Kbuild updates for v6.11	2024-07-23 14:32:21 -07:00
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drm	…
dt-bindings	Char/Misc and other driver changes for 6.11-rc1	2024-07-19 15:55:08 -07:00
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linux	mm: memcg: add cacheline padding after lruvec in mem_cgroup_per_node	2024-07-26 14:33:09 -07:00
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net	sysctl: treewide: constify the ctl_table argument of proc_handlers	2024-07-24 20:59:29 +02:00
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scsi	Driver core changes for 6.11-rc1	2024-07-25 10:42:22 -07:00
soc	sound updates for 6.11-rc1	2024-07-19 12:39:34 -07:00
sound	Driver core changes for 6.11-rc1	2024-07-25 10:42:22 -07:00
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trace	Random number generator updates for Linux 6.11-rc1.	2024-07-24 10:29:50 -07:00
uapi	A lot of networking people were at a conference last week, busy	2024-07-25 13:32:25 -07:00
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vdso	Random number generator updates for Linux 6.11-rc1.	2024-07-24 10:29:50 -07:00
video	…
xen	Driver core changes for 6.11-rc1	2024-07-25 10:42:22 -07:00