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[34.125.67.193]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cdb364c48d4sm241826a12.27.2026.11.02.11.40.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Nov 2026 11:40:40 -0800 (PST) From: Daeho Jeong To: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, kernel-team@android.com Cc: Daeho Jeong Subject: [PATCH 19/20] f2fs: count compress cache entries in pages for its memory limit Date: Mon, 2 Nov 2026 11:39:51 -0800 Message-ID: <20261102193952.3002018-20-daeho43@gmail.com> X-Mailer: git-send-email 2.56.0.385.gac671c819a-goog In-Reply-To: <20261102193952.3002018-1-daeho43@gmail.com> References: <20261102193952.3002018-1-daeho43@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Daeho Jeong The compress cache holds one filesystem block per entry, but f2fs_available_free_memory() compares the number of entries with a percentage of free memory counted in pages. With subpage blocks, this limits the compress cache to a fraction (block size / PAGE_SIZE) of the memory that compress_percent allows. Convert the entry count to pages before the comparison. No functional change when the block size equals PAGE_SIZE. Signed-off-by: Daeho Jeong --- fs/f2fs/node.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index b95bb5c27b0b..66b28ae91756 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -116,10 +116,12 @@ bool f2fs_available_free_memory(struct f2fs_sb_info *sbi, int type) /* * free memory is lower than watermark or cached page count - * exceed threshold, deny caching compress page. + * exceed threshold, deny caching compress page. A cache + * entry holds one block, so convert the entry count to pages. */ res = (free_ram > avail_ram * sbi->compress_watermark / 100) && - (COMPRESS_CACHE(sbi)->num_entries < + ((COMPRESS_CACHE(sbi)->num_entries >> + F2FS_LOG_BLKS_PER_PAGE(sbi)) < free_ram * sbi->compress_percent / 100); #else res = false; -- 2.56.0.317.g454f8302e1-goog