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From: Shakeel Butt <shakeel.butt@linux.dev>
To: kernel test robot <oliver.sang@intel.com>
Cc: Qi Zheng <zhengqi.arch@bytedance.com>, oe-lkp@lists.linux.dev, 
	lkp@intel.com, linux-kernel@vger.kernel.org, 
	Andrew Morton <akpm@linux-foundation.org>, David Carlier <devnexen@gmail.com>, 
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	cgroups@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [linus:master] [mm]  01b9da291c: stress-ng.switch.ops_per_sec
 67.7% regression
Message-ID: <agNO8G8tPnPuVrGq@linux.dev>
References: <202605121641.b6a60cb0-lkp@intel.com>
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On Tue, May 12, 2026 at 08:56:52PM +0800, kernel test robot wrote:
> 
> 
> Hello,
> 
> kernel test robot noticed a 67.7% regression of stress-ng.switch.ops_per_sec on:
> 
> 
> commit: 01b9da291c4969354807b52956f4aae1f41b4924 ("mm: memcontrol: convert objcg to be per-memcg per-node type")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

This is most probably due to shuffling of struct mem_cgroup and struct
mem_cgroup_per_node members.

I will try to reproduce and will followup on this.