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From: Hao Li To: Zhao Liu 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 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: X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: DE79F180004 X-Stat-Signature: sk1cbw1x9owemfmre7rih9odhrxxi361 X-Rspam-User: X-HE-Tag: 1768554599-851900 X-HE-Meta: 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 cN6pSVPt AW/fOC/F2UUcrkLV2Dw/Sq3W/trFJCXApE2Lmk1r9P60BYpFOoUc460ViUhUaATeRfv+xanbdsFJfd8N1WI5Rmd+lE+vcae4vkjPcj3mEJSW2BZpVT79ztFwAGl2eHf9aV/52orRxKYFFwNtaU8GSOzAwobV38y1KS7fe+AYyfM3iyei6eEeIPT0pZDbkU7o4slqB7qrdMlIMEuIMW/+S1qMNqCO/SclC88HTei5maUGjIq1ydTNyno2zHayq3XUDggNBGUlVq0TAf3KYyk7dBjJA2NWTsnt3fyjntfLJ+wRG2u5AkuvueA8QiqDQ6L/V/LawSUIGURGyoYQNYYEgksXgryO3wQuubMZQpDVWDYbUr3VBh1Q/Nj/h6ghmNUsTH3BeWX1at3FBVeY= 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: On Fri, Jan 16, 2026 at 05:16:03PM +0800, Zhao Liu wrote: > > 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. Got it. Thanks, in any case, I'll try to reproduce it first. > > > 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/ Thanks! > > 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 >