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b=ZojFhx9R+LTcgFWvB6D579Bp8pIHrYMdVo1lmf347EF9750RL1fZP5YQ6cP5bx56J KbS0QP56JtA/VXT8o3Kgf1w9YrMjSpiAf3gudn0XXCuYxa2vI+ha20167AnbL5WU0w o438zH18o/mVxo5f1uJHdXuytusVP2RdnCx4OxulIN4B+FInAHbHeuxgxCeXgO99iu ZBWRSgpQg4LbZpsx8VD8afNWprlGFHdxcRIg1L3UguxypEjqku93IHdHAARj0vnT59 LoSLUO5dUfHuxLEgKrCMeoHc8VF00mJFSssnmRQyYAIw2T4sWzw3R49KTJrsC/8U7b vvi+/hkfl8fvw== From: SeongJae Park To: Honggyu Kim , Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, Masami Hiramatsu , Mathieu Desnoyers , Steven Rostedt , Gregory Price , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, 42.hyeyoo@gmail.com, art.jeongseob@gmail.com, kernel_team@skhynix.com, Hyeongtak Ji , Rakie Kim , Yunjeong Mun Subject: Re: [PATCH v6 0/7] DAMON based tiered memory management for CXL memory Date: Fri, 14 Jun 2024 09:39:37 -0700 Message-Id: <20240614163937.85523-1-sj@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240614030010.751-1-honggyu.kim@sk.com> References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 83E2740016 X-Stat-Signature: mg5p8wasoe11oyydog8titjk7xxtgfc3 X-Rspamd-Server: rspam09 X-Rspam-User: X-HE-Tag: 1718383185-74666 X-HE-Meta: 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 L+SQjDwH ztLDNEgjHsHmQmyAox9h3ZoB1AeLSWL9o7cU3TiQb2EdaDFYrFdBipQwKIdUPZGOgavLx64EA+HNRj9Ywv/PqcXJVP0NYI8de0DlFHq3uS2imsHHhfhe/Rr5SLd2zD6bYKcbZ8dWHyIJ8wVaJsv6vr06eA7FDSGMVRPGlRdsKufFRDZBWmUVpKln/tidcVAG4RchP34s8ob23yhqlaj/alFzzbtRERktM+j7YmP7l9Htm+SJ4/P6qFEZSTZY43FonX87Ry8BH5GCYmU9bH1RgDI3CK7hJBBpHf4ZaP3KiAO9t1IIWK3qtgEgE7vxufBQkUk7FmEitVzL9XXMckfGCIsggCDmT/KS9BHyjqMNX4Mpv3iiVZ4qRMUnEMQ== 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, 14 Jun 2024 12:00:02 +0900 Honggyu Kim wrote: > There was an RFC IDEA "DAMOS-based Tiered-Memory Management" previously > posted at [1]. > > It says there is no implementation of the demote/promote DAMOS action > are made. This patch series is about its implementation for physical > address space so that this scheme can be applied in system wide level. > > Changes from v5: > https://lore.kernel.org/20240613132056.608-1-honggyu.kim@sk.com > 1. Remove new actions in usage document as its for debugfs Thank you, I confirmed this and gave you my Reviewed-by: tag. > 2. Apply minor fixes on cover letter But... [...] > 2. YCSB zipfian distribution read only workload (with demotion_enabled true) > memory pressure with cold memory on node0 with 512GB of local DRAM. > ====================+================================================+========= > | cold memory occupied by mmap and memset | > | 0G 440G 450G 460G 470G 480G 490G 500G | > ====================+================================================+========= > Execution time normalized to DRAM-only values | GEOMEAN > --------------------+------------------------------------------------+--------- > DAMON tiered | - 1.03 1.03 1.03 1.03 1.03 1.07 1.05 | 1.04 > DAMON lazy | - 1.04 1.03 1.04 1.05 1.06 1.06 1.06 | 1.05 > DAMON tiered kswapd | - 1.03 1.03 1.03 1.03 1.02 1.02 1.03 | 1.03 > DAMON lazy kswapd | - 1.04 1.04 1.04 1.03 1.05 1.04 1.05 | 1.04 > ====================+================================================+========= > CXL usage of redis-server in GB | AVERAGE > --------------------+------------------------------------------------+--------- > DAMON tiered | - 0.6 0.5 0.4 0.7 0.8 7.1 5.6 | 2.2 > DAMON lazy | - 0.5 3.0 4.5 5.4 6.4 9.4 9.1 | 5.5 > DAMON tiered kswapd | - 0.0 0.0 0.4 0.5 0.1 0.8 1.0 | 0.4 > DAMON lazy kswapd | - 4.2 4.6 5.3 1.7 6.8 8.1 5.8 | 5.2 > ====================+================================================+========= > > Each test result is based on the exeuction environment as follows. Seems the typo is not fixed? I don't want to delay this work for such trivial thing, though. For the patch series, Acked-by: SeongJae Park Thanks, SJ [...]