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Received: from willy by casper.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1wG75r-0000000EUjd-3o1v; Fri, 24 Apr 2026 03:20:40 +0000 Date: Fri, 24 Apr 2026 04:20:39 +0100 From: Matthew Wilcox To: Yibin Liu Cc: Lorenzo Stoakes , "linux-mm@kvack.org" , "akpm@linux-foundation.org" , "Liam.Howlett@oracle.com" , "viro@zeniv.linux.org.uk" , "brauner@kernel.org" , "mjguzik@gmail.com" , Jianyong Wu , Huangsj , Yuan Zhong , "jack@suse.cz" , "jlayton@kernel.org" , "chuck.lever@oracle.com" , "alex.aring@gmail.com" , "vbabka@kernel.org" , "jannh@google.com" , "pfalcato@suse.de" , "linux-fsdevel@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: Re: =?utf-8?B?562U5aSNOiDnrZTlpI06IFtQQVRD?= =?utf-8?B?SF0gbW06IEFk?= =?utf-8?Q?d?= RWH_RMAP_EXCLUDE flag to exclude files from rmap sharing Message-ID: References: <20260421020932.3212532-1-liuyibin@hygon.cn> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 9FB6514000D X-Stat-Signature: tuan1qrqqxctfz5bsguonwhpgtqfrhay X-Rspam-User: X-HE-Tag: 1777000845-667646 X-HE-Meta: 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 AXoL4c2d ddSyxspiF+06cgfXyCDeUNcWgc9BOXmFCb+Au7Ne1R5R4sv2dr/+NcnM0e0Miyy3mvDrqVSidWpYG5H/F5yCoelkY2O6vXGFWchV/8y4G/cr/fxfYzIGulY8/iW+1Rn3f0apydQKua+ZSkvLUfnrSut2zKuhqnhwi7OoGQTgPRlgrvAE4IcTo2eCntlK/c1W/gXu9oEi6FZMLgjabS+gvFhVRRUQmx2Rxj+JUeCOfWG1/Gwn1EBuX4/z+rT/M3CrnWz7ovhs0GzOq9YlO9tA5T9HsdofAWkMxj/2aWPlO+VTJ6BC+cLS6EZeVJNkNJKKXx2mcTl1TCFax1meNH6CpbC6tCbh20sZaWfuTnTkUOIO3+H006rstOc1WkSt2RupilycGA4/FxFuAVjmL8KVu7WwMz4T6goZKR2/xHVzyMm0WrnbUNW6ZHVe6bQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Apr 24, 2026 at 01:08:35AM +0000, Yibin Liu wrote: > On an Intel Emerald Rapids server (112 cores), run the execl benchmark from > UnixBench with the command: ./Run -c 220 execl > Then perf top shows: > > 91.53% [kernel] [k] osq_lock > 0.50% [kernel] [k] rwsem_spin_on_owner OK, but does this represent a realistic workload? It's pretty easy to construct workloads that hammer on particular locks; the question is whether it's a relevant performance bottleneck that customers care about.