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Fri, 03 Oct 2025 15:49:22 -0700 (PDT) Received: from daehojeong-desktop.mtv.corp.google.com ([2a00:79e0:2e7c:8:5098:8942:78be:db30]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-78b0204edf0sm5959882b3a.44.2025.10.03.15.49.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Oct 2025 15:49:21 -0700 (PDT) From: Daeho Jeong To: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, kernel-team@android.com Cc: Daeho Jeong Subject: [PATCH] f2fs: set default valid_thresh_ratio to 80 for zoned devices Date: Fri, 3 Oct 2025 15:49:17 -0700 Message-ID: <20251003224917.1950708-1-daeho43@gmail.com> X-Mailer: git-send-email 2.51.0.618.g983fd99d29-goog Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Daeho Jeong Zoned storage devices provide marginal over-capacity space, typically around 10%, for filesystem level storage control. By utilizing this extra capacity, we can safely reduce the default 'valid_thresh_ratio' to 80. This action helps to significantly prevent excessive garbage collection (GC) and the resulting power consumption, as the filesystem becomes less aggressive about cleaning segments that still hold a high percentage of valid data. Signed-off-by: Daeho Jeong Reviewed-by: Chao Yu --- fs/f2fs/gc.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/f2fs/gc.h b/fs/f2fs/gc.h index 24e8b1c27acc..6c4d4567571e 100644 --- a/fs/f2fs/gc.h +++ b/fs/f2fs/gc.h @@ -25,7 +25,7 @@ #define DEF_GC_THREAD_CANDIDATE_RATIO 20 /* select 20% oldest sections as= candidates */ #define DEF_GC_THREAD_MAX_CANDIDATE_COUNT 10 /* select at most 10 sections= as candidates */ #define DEF_GC_THREAD_AGE_WEIGHT 60 /* age weight */ -#define DEF_GC_THREAD_VALID_THRESH_RATIO 95 /* do not GC over 95% valid bl= ock ratio for one time GC */ +#define DEF_GC_THREAD_VALID_THRESH_RATIO 80 /* do not GC over 80% valid bl= ock ratio for one time GC */ #define DEFAULT_ACCURACY_CLASS 10000 /* accuracy class */ =20 #define LIMIT_INVALID_BLOCK 40 /* percentage over total user space */ --=20 2.51.0.618.g983fd99d29-goog