linux-kernel - Re: [PATCH v4] zram: Implement multi-page write-back

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Message-ID: <rjwycg4sfzuroi3yzsovtebwocabyoq4vq4fuc2cbh3w4n3uo3@o7dpmtvqr7fe>
Date: Thu, 13 Nov 2025 11:04:04 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Yuwen Chen <ywen.chen@...mail.com>
Cc: axboe@...nel.dk, akpm@...ux-foundation.org, bgeffon@...gle.com, 
	licayy@...look.com, linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, liumartin@...gle.com, minchan@...nel.org, richardycc@...gle.com, 
	senozhatsky@...omium.org
Subject: Re: [PATCH v4] zram: Implement multi-page write-back

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.