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[209.85.218.49]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a729d778baesm78506566b.100.2024.06.27.10.23.44 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 27 Jun 2024 10:23:45 -0700 (PDT) Received: by mail-ej1-f49.google.com with SMTP id a640c23a62f3a-a728f74c23dso271273466b.1 for ; Thu, 27 Jun 2024 10:23:44 -0700 (PDT) X-Forwarded-Encrypted: i=1; AJvYcCViFNpLcQn0M6M6+HTPhBmJjfwN74LN/D8Z/uGpUBVtzMx6FxgAVeuLNQ/0+4HZxyWkvZU5hhpUfX8nA6JtT68+Jlg= X-Received: by 2002:a17:906:7955:b0:a72:98a0:7159 with SMTP id a640c23a62f3a-a7298a072damr233670466b.68.1719509024080; Thu, 27 Jun 2024 10:23:44 -0700 (PDT) MIME-Version: 1.0 References: <202406270912.633e6c61-oliver.sang@intel.com> In-Reply-To: From: Linus Torvalds Date: Thu, 27 Jun 2024 10:23:27 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [linux-next:master] [lockref] d042dae6ad: unixbench.throughput -33.7% regression To: Mateusz Guzik Cc: kernel test robot , oe-lkp@lists.linux.dev, lkp@intel.com, Linux Memory Management List , Christian Brauner , linux-kernel@vger.kernel.org, ying.huang@intel.com, feng.tang@intel.com, fengwei.yin@intel.com Content-Type: text/plain; charset="UTF-8" X-Stat-Signature: 9c9zc3qprf5kogebudu61ujohz1k1jyu X-Rspamd-Queue-Id: 3FBD3C0012 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1719509026-446378 X-HE-Meta: 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 iCDB8hRt 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 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 Thu, 27 Jun 2024 at 09:57, Linus Torvalds wrote: > > .dput.terminate_walk.path_openat.do_filp_open Hmm. This may be due to the benchmark being in /proc/net, and retain_dentry() returning false. Then the fastpath in fast_dput() won't trigger, and we'll always end up doing the dentry lock if we're the last user (which presumably we will be, there's probably not anybody else there?) Linus