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From: Shakeel Butt <shakeel.butt@linux.dev>
To: Oliver Sang <oliver.sang@intel.com>
Cc: Qi Zheng <qi.zheng@linux.dev>, oe-lkp@lists.linux.dev, lkp@intel.com, 
	linux-kernel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>, 
	David Carlier <devnexen@gmail.com>, Allen Pais <apais@linux.microsoft.com>, 
	Axel Rasmussen <axelrasmussen@google.com>, Baoquan He <bhe@redhat.com>, 
	Chengming Zhou <chengming.zhou@linux.dev>, Chen Ridong <chenridong@huawei.com>, 
	David Hildenbrand <david@kernel.org>, Hamza Mahfooz <hamzamahfooz@linux.microsoft.com>, 
	Harry Yoo <harry.yoo@oracle.com>, Hugh Dickins <hughd@google.com>, 
	Imran Khan <imran.f.khan@oracle.com>, Johannes Weiner <hannes@cmpxchg.org>, 
	Kamalesh Babulal <kamalesh.babulal@oracle.com>, Lance Yang <lance.yang@linux.dev>, 
	Liam Howlett <Liam.Howlett@oracle.com>, Lorenzo Stoakes <ljs@kernel.org>, Michal Hocko <mhocko@suse.com>, 
	Michal =?utf-8?Q?Koutn=C3=BD?= <mkoutny@suse.com>, Mike Rapoport <rppt@kernel.org>, 
	Muchun Song <muchun.song@linux.dev>, Muchun Song <songmuchun@bytedance.com>, 
	Nhat Pham <nphamcs@gmail.com>, Roman Gushchin <roman.gushchin@linux.dev>, 
	Suren Baghdasaryan <surenb@google.com>, Usama Arif <usamaarif642@gmail.com>, 
	Vlastimil Babka <vbabka@kernel.org>, Wei Xu <weixugc@google.com>, Yosry Ahmed <yosry@kernel.org>, 
	Yuanchu Xie <yuanchu@google.com>, Zi Yan <ziy@nvidia.com>, Usama Arif <usama.arif@linux.dev>, 
	cgroups@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [linus:master] [mm] 01b9da291c: stress-ng.switch.ops_per_sec
 67.7% regression
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On Wed, May 20, 2026 at 10:43:22AM +0800, Oliver Sang wrote:
> hi, Shakeel,
> 
> On Tue, May 19, 2026 at 07:22:52AM -0700, Shakeel Butt wrote:
> > Hi Oliver,
> > 
> 
> [...]
> 
> > 
> > > > > 
> > > > > Also I am rethinking the approach, so I will send a prototype in response on
> > > > > this email for which I will need your help in testing.
> > > > 
> > > > Hi Oliver, can you please test the following patch?
> > > 
> > > got it. will change to test following patch. and this looks quite different
> > > with v2 or v3, so if you still want us to test v3, please let me know. thanks!
> > > 
> > 
> > No need to test v3 as it is similar to v2. Please test the following patch as it
> > is a direction I want to pursue and wanted an early signal if this is the right
> > direction.
> 
> FYI. in our tests, the following patch also recovers the regresion.
> 
> Tested-by: kernel test robot <oliver.sang@intel.com>

Thanks a lot. I will send out the formal patch with your tested-by tag.