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U2FsdGVkX1/wpEK59ymgAJnsncD6XASdqfRhuOmlieZQvqdA5/tQevTwwsZuDvypvtpEdDhiex1JVgH+DuN3FLT5RHoHRPp3ZOO2Ga9/VYf1EKleCOMQkSNzacQclEcmMeGYpbGmfYqhdVkubZd8y+ozf/40QC+zoDF/esub/3/IJpHPEaSROtG4+GrMrAZ5AKUVNQdUNzLyvNeisIsfZMZaj5vmoEKy5KXNeQD6DpjbhHFymu12vn7qeHwk6CCI3lC9wjpSmaX8OtsM2qBSomvRfb/zTY8StH1sC/n6+d7g73DA6tsv/mXGFFzpi8g1geGJHmNt3e/tmAeWU8BPBOzFEk8ydhQcYcUSZu7xkKWn+4N5mocmOMmTxF5CrubZAJR83Gad1rD6Mfw1wISmhDteGxDnsE7CUras3eABtpPsbV6IppWZlLwxw55rOO5nMzfQmdAPeMut4lC7ElnuSIthAvu/mX/2PFU7PcCX6DZtlfLvcb5Fca1j5FeimXhXv11M0vpyLHjeK3+VRjTB1DbO5p0dXV4WItsFbvBj4VcpdkRN9i+VgVxhdYF/4zHRFh942eVfPO1jiLGCpRX5QNdG+F4Sw18/+2CNIhar9k/fHe6JGRPaHEP3SmsnrBkcgfHlytC8O9n/c3mb0JR9yvlHbQ5kQrnCAPv8bs5+ny3uSi6zD4yHtwwUfzBdIIHpuI6qoOA2bYGIEO6xcPZJHYZQa+7TU4X/lsenQgAiRvzELaPxjGvbqOe+Bd4vmvVaGk363tRdWZA2Q0mgZ6iw5XlVe52yoMFFu4cqRbyXDqoFgnPVivrms8lwQ1SRN26q4fAtUg4pBdvlLDj4QavLtzetkbhag3PAEYMs9rCY3oTyc7+V14jDWG+mj3S2YWQHaxDplFKnEhsa4T0Heq65U78+y/vIgSdFm3ZbSeTeQDzr/KO1WMF49CxDnPRSuIFdeLU9oVhJKOifLKEidE1 +8DA/iwi rNAwZb23Rgll3ysV6JRrPbL7v2QHPOG2QJ+cEplKHDgsMTRG6wMNL0g9/PvFZ9A7x/syWlwZ98Skm8cSQ29X3zM619u/bLV93Xlv4CBCZqt+gTXvheD95gzPL+TJYZPI4aZoZ+1xWDITOe9DwbmWnRBrxwJaN4mYvepRcwTrwYq8qGiwb7Cono3qNo5KmkBlQy1Iub0tPZAdJ6G/7RX0npkOy+SoJSm1i4/5BjF6yVSpsqmp2OGlhO1neFjHd+H6oFOMdvs/YAk5N9uxiJCSFwP8QMv6s+PiD9KO707e1LYMDbRPGKU494r37esiqhgIsUloDl7g0YHG+JAd5zwHV9snlG3c+X/y2enra1iFeJixV0A/f8A1MWux1B/FWR9RXaFoo5E6cRa992/x3sJum8sGArruUzXg9pDYoBR7dgxdnrBqMT7hX7TNzi9Xx54Uf/OWb 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: hi, Muchun Song, On Mon, Jul 15, 2024 at 10:40:43AM +0800, Muchun Song wrote: > > > > On Jul 14, 2024, at 20:26, Oliver Sang wrote: > > > > hi, Yu Zhao, > > > > On Wed, Jul 10, 2024 at 12:22:40AM -0600, Yu Zhao wrote: > >> On Mon, Jul 8, 2024 at 11:11 PM kernel test robot wrote: > >>> > >>> Hello, > >>> > >>> kernel test robot noticed a -34.3% regression of vm-scalability.throughput on: > >>> > >>> > >>> commit: 875fa64577da9bc8e9963ee14fef8433f20653e7 ("mm/hugetlb_vmemmap: fix race with speculative PFN walkers") > >> > >> This is likely caused by synchronize_rcu() wandering into the > >> allocation path. I'll patch that up soon. > >> > > > > we noticed this commit has already been merged into mainline > > > > [bd225530a4c717714722c3731442b78954c765b3] mm/hugetlb_vmemmap: fix race with speculative PFN walkers > > branch: linus/master > > Did you test with HVO enabled (there are two ways to enable HVO: 1) adding cmdline with "hugetlb_free_vmemmap=on" > or 2) write 1 to /proc/sys/vm/hugetlb_optimize_vmemmap)? I want to confirm if the regression is related > to HVO routine. we found a strange thing, after adding 'hugetlb_free_vmemmap=on', the data become unstable by run to run (we use kexec from previous job to next one). below is for 875fa64577 + 'hugetlb_free_vmemmap=on' "vm-scalability.throughput": [ 611622, 645261, 705923, 833589, 840140, 884010 ], as a comparison, without 'hugetlb_free_vmemmap=on', for 875fa64577: "vm-scalability.throughput": [ 4597606, 4357960, 4385331, 4631803, 4554570, 4462691 ], for 73236245e0 (parent of 875fa64577): "vm-scalability.throughput": [ 6866441, 6769773, 6942991, 6877124, 6785790, 6812001 ], > > Thanks. > > > > > and the regression still exists in our tests. do you want us to test your > > patch? Thanks! >