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Wed, 12 Nov 2025 18:04:09 -0800 (PST) Received: from google.com ([2401:fa00:8f:203:2495:f9c3:243d:2a7e]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7b927731a72sm389619b3a.50.2025.11.12.18.04.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 12 Nov 2025 18:04:09 -0800 (PST) Date: Thu, 13 Nov 2025 11:04:04 +0900 From: Sergey Senozhatsky To: Yuwen Chen Cc: axboe@kernel.dk, akpm@linux-foundation.org, bgeffon@google.com, licayy@outlook.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, liumartin@google.com, minchan@kernel.org, richardycc@google.com, senozhatsky@chromium.org Subject: Re: [PATCH v4] zram: Implement multi-page write-back Message-ID: References: <83d64478-d53c-441f-b5b4-55b5f1530a03@kernel.dk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 25DA3A0007 X-Stat-Signature: me566y787c8anm9nfsj9wgpcas9tzw4i X-Rspam-User: X-HE-Tag: 1762999450-936809 X-HE-Meta: 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 EJsU6vMm rtFA66mUhsGffDgGqJv+pkMWUBVwubd0nya7LEchx4dhfGJ7ViivTnjUgdvVve0IRdcV6FWlfBQ8bwi6LVykzmQoHPTkVj2TBrnVde0z+oi8cgfvWu8mdV6E0lsSeldA9QyJLV+bsioYZGXvt7N37oTD5lO6wJzrXphoHBAM9LFgLN9mBn3MZBgaO2axNAL3pHUB7SHVq0L/V6Pfut8g5nwBDYQlcyXmdiRT/XK7qEa6k+qbcT38Y+pZPBysszZ7Zk4vlsWTOyppHCZvS4TfXSV1CX+gWMj28ccyhbF5bT85j9JLf2QWdJAHqAZ3dmKdYXtw13rR6hO4cS/9bE6m0fWxFBak7v9gwi4lG2cmV4DGol5c= 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 (25/11/06 09:49), Yuwen Chen wrote: > + > +#define ZRAM_WB_REQ_CNT (32) > + How was this number chosen? Did you try lower/higher values? I think we might want this to be runtime tunable via sysfs, e.g. writeback_batch_size attr, with min value of 1.