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Mon, 07 Aug 2023 02:44:57 -0700 (PDT) From: Hyeongtak Ji To: sj@kernel.org, akpm@linux-foundation.org Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Hyeongtak Ji , Hyeongtak Ji Subject: [PATCH] mm/damon: Prevent unnecessary age reset for regions Date: Mon, 7 Aug 2023 18:44:35 +0900 Message-Id: <1691401475-3796-1-git-send-email-hyeongtak.ji@gmail.com> X-Mailer: git-send-email 2.7.4 X-Rspamd-Queue-Id: 42C0140007 X-Rspam-User: X-Stat-Signature: ueebaggyj3kznxa1nojmno436f3zbxx7 X-Rspamd-Server: rspam03 X-HE-Tag: 1691401499-70616 X-HE-Meta: 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 IC6dP/Jl zNY4av5X65QGy68wEn/pojab1HYucp8hYrnuDKK46NbsnPt0KgxSBvHsRLKnipq8JuzjbiuhMhgvDIYYfgLLXPurrIQIngdJ89hwuWKFgBkiJGCeRvqza9zAe1m3hXZicWpNRuhr/g7p3WkDXBRtvO1+SZAR+l6ZusyXLDQFHUa8aMB6E9pPscXQd9h6Opb2c4hJE2FvsvJ5SbZRDp+udZDfLiCZWlMrWh4oPf7kry+x7ohb1sr3aH/K7f9UKtLsDLspD8UU/n8djzXEgi1H8tCUcBMgEj8s32lSXlRA3i9aIzgJ2/+JoELfVnjrWTJF7YEI+SmkRRSbcr3p1s+6z/BWiXmiAi+koIV1Qc6M8e/EFo/YG1sgKwu/dKiDYIuRs6cu2IcRj0wGN4PxFfJH3NbWJeXHkjbt5IumjPFzry6Q8DsjTHAevu6UXkto3BrC+SR9htSa2RR5iFHGtRqzu38zOOmaVET/AzPR7SQZa7pU/eGvF0Zztbg6hzO79n02whwp1sOiPwvwsv38k3yGnGqDZ0jCPjEIcPLoq X-Bogosity: Ham, tests=bogofilter, spamicity=0.013586, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: DAMON resets the age of each region after applying each scheme, regardless of whether the scheme has been successfully applied. This patch adds a simple condition to prevent the age of regions from being reset when schemes have not been actually applied. Signed-off-by: Hyeongtak Ji --- mm/damon/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/damon/core.c b/mm/damon/core.c index 91cff7f2997e..4044fcf18ac1 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -908,7 +908,7 @@ static void damos_apply_scheme(struct damon_ctx *c, struct damon_target *t, quota->charge_addr_from = r->ar.end + 1; } } - if (s->action != DAMOS_STAT) + if (s->action != DAMOS_STAT && sz_applied > 0) r->age = 0; update_stat: -- 2.7.4