linux-ext4 - how to disable readahead

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Message-ID: <669f0b8e36cb4ccebd20dea8662b9333@SIWEX5A.sing.micron.com>
Date:   Mon, 30 Jul 2018 09:10:52 +0000
From:   "Bean Huo (beanhuo)" <beanhuo@...ron.com>
To:     "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
CC:     "beanhuo.linux@...gle.com" <beanhuo.linux@...gle.com>
Subject: how to disable readahead

Hi, ext4 experts 
For some cases, the storage device inside(FW) already has readahead feature.
I want to disable ext4 readahead and do some test. And see what is the difference
between these situations.
But I tried "inode_readahead_blks" parameter to disable readahead, but it doesn't work.
What else I need to set for disabling ext4 readahead? 
Thanks.

//bean huo