Turn off readahead completely

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To: <linux-fsdevel@xxxxxxxxxxxxxxx>
Subject: Turn off readahead completely
From: <Azat.Nurgaliev@xxxxxx>
Date: Thu, 21 Oct 2021 13:16:46 +0000
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Thread-topic: Turn off readahead completely

Hello everyone,

I need to turn readahead off completely in order to do my experiments. 
Is there any way to turn it off completely?

Setting /sys/block/<dev>/queue/read_ahead_kb to 0 causes readahead to become 4kb.

Thanks,
Azat

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