From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: kernel test robot <oliver.sang@intel.com>,
Thomas Gleixner <tglx@linutronix.de>
Cc: oe-lkp@lists.linux.dev, lkp@intel.com,
linux-kernel@vger.kernel.org,
Peter Zijlstra <peterz@infradead.org>,
linux-mm@kvack.org, aubrey.li@linux.intel.com,
yu.c.chen@intel.com
Subject: Re: [linus:master] [sched/mmcid] 77d7dc8bef: will-it-scale.per_thread_ops 10.4% regression
Date: Tue, 6 Jan 2026 08:39:43 -0500 [thread overview]
Message-ID: <2db4150b-2608-409c-8d15-ced64964c2c5@efficios.com> (raw)
In-Reply-To: <202601060955.b7b9ad22-lkp@intel.com>
On 2026-01-05 21:15, kernel test robot wrote:
[...]
> now we found a regression in will-it-scale tests. report again FYI the
> performance impact of this change in our tests.
>
>
> kernel test robot noticed a 10.4% regression of will-it-scale.per_thread_ops on:
>
>
> commit: 77d7dc8bef482e987036bc204136bbda552d95cd ("sched/mmcid: Revert the complex CID management")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
This is expected for this preparation patch (revert of complex mm_cid
management) from Thomas. He then builds his new implementation on top
to reduce overhead, but in a different way.
Thanks,
Mathieu
--
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com
prev parent reply other threads:[~2026-01-06 13:39 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-06 2:15 kernel test robot
2026-01-06 13:39 ` Mathieu Desnoyers [this message]
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