linux-kernel - Re: [PATCH] zram: support a page writeback

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Date:   Fri, 16 Oct 2020 09:25:47 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Minchan Kim <minchan@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, rajekumar@...gle.com,
        amosbianchi@...gle.com, joaodias@...gle.com,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [PATCH] zram: support a page writeback

On (20/10/12 00:14), Minchan Kim wrote:
>  
>  With the command, zram writeback idle pages from memory to the storage.
>  
> +If admin want to write a specific page in zram device to backing device,
> +they could write the page index into the interface.
> +
> +	echo 1251 > /sys/block/zramX/writeback
> +

May be we can make it more explicit?

	echo "page_index=123" > /sys/block/zramX/writeback

Just in case of future extensions. E.g. someone might want to
have something like

	echo "idle_nr=123" > /sys/block/zramX/writeback

which would write_back 123 idle pages max.

	-ss