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X-CSE-ConnectionGUID: qsHhLQ3wRQWUjFHNzWRtww== X-CSE-MsgGUID: QO5mMHIhRxW81Aq2EdokZw== X-IronPort-AV: E=McAfee;i="6800,10657,11672"; a="80982147" X-IronPort-AV: E=Sophos;i="6.21,230,1763452800"; d="scan'208";a="80982147" Received: from orviesa001.jf.intel.com ([10.64.159.141]) by orvoesa105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Jan 2026 00:50:39 -0800 X-CSE-ConnectionGUID: USy2ZwdtTxuAED8Xk6nV2A== X-CSE-MsgGUID: BgdxI1+TTcCzp1xlNG4FLA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,230,1763452800"; d="scan'208";a="242741334" Received: from liuzhao-optiplex-7080.sh.intel.com (HELO localhost) ([10.239.160.39]) by orviesa001.jf.intel.com with ESMTP; 16 Jan 2026 00:50:33 -0800 Date: Fri, 16 Jan 2026 17:16:03 +0800 From: Zhao Liu To: Hao Li Cc: Vlastimil Babka , Hao Li , akpm@linux-foundation.org, harry.yoo@oracle.com, cl@gentwo.org, rientjes@google.com, roman.gushchin@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, tim.c.chen@intel.com, yu.c.chen@intel.com, zhao1.liu@intel.com Subject: Re: [PATCH v2] slub: keep empty main sheaf as spare in __pcs_replace_empty_main() Message-ID: References: <20251210002629.34448-1-haoli.tcs@gmail.com> <3foece42fc3wj3wgcnibi7cn2be73ancyjgrzdqfjeqvjtwkhj@lzqd572wfpvz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3foece42fc3wj3wgcnibi7cn2be73ancyjgrzdqfjeqvjtwkhj@lzqd572wfpvz> X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: C276314000B X-Stat-Signature: 54u94wer5bgsgz8os96fac5bgq7wh7pm X-HE-Tag: 1768553439-482505 X-HE-Meta: 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 YvTvc1yr Bn4iJ5Nj9Qj4OzByGLmaEGBDbw+1ls05+62kAJCgWHGqoswhbUifQN+TpyApJtUwOKlHZqzRvAIaTj1ZNrLbwg9EJxAzYNHJ3eLT6mPhRcYW2oFJBXsLQOtASE9Sxb5NueziglxDhPQPWAURy2YbiF1d2NT7eBihJkBojncmjpjveNExD3iRz95/SJy9+8fiSVSAn4w9CmyJqpZZeoe6TaELCwVrVpGUn2is5Y22s68aB+15fBkJSjMOQ7pLvCgLbkjoEu/psfEJcvMuJqqbH7cKnSSC/lAf+zIpGJwTponToPDyD4u0HMLiU+qsa81dMBunrydGUeURb+G3JnwqmvcYYyBuAyuPcQ0nMdDy06Zor3idXz+KomPxAvbw1q5AL6bFZbid6eJKUv3vChbuSxY9hU9TK8GmIwS3FDC5oP8iSXZDZ0xDIcTwLRw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: > I'd like to dig a bit deeper to confirm whether the "256 tasks" result is truly > a regression. The "256" seems align closely with the NUMA topology on my machine, so I'm unsure how it will perform on other machines. > Could you please share the original full report, or let me know > which test case under will-it-scale/ you used? I mainly followed Suneeth's steps [*]: 1) git clone https://github.com/antonblanchard/will-it-scale.git 2) git clone https://github.com/intel/lkp-tests.git 3) cd will-it-scale && git apply lkp-tests/programs/will-it-scale/pkg/will-it-scale.patch 4) make 5) python3 runtest.py mmap2 25 process 0 0 1 8 64 128 192 256 [*]: https://lore.kernel.org/all/262c742f-dc0c-4adc-b23c-047cd3298a5e@amd.com/ Sine the raw perf.data files are too big to be blocked, if you need to see any specific part of the content, I can paste the info for you. Regards, Zhao