Re: [PATCH] mm: add config for readahead window

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To: Wei Wang <wvw@xxxxxxxxxx>
Subject: Re: [PATCH] mm: add config for readahead window
From: "Huang\, Ying" <ying.huang@xxxxxxxxx>
Date: Mon, 19 Mar 2018 10:36:58 +0800
Cc: <gregkh@xxxxxxxxxxxxxxxxxxx>, Todd Poynor <toddpoynor@xxxxxxxxxx>, "Wei Wang" <wei.vince.wang@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Dan Williams <dan.j.williams@xxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxx>, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, Jan Kara <jack@xxxxxxx>, Jérôme Glisse <jglisse@xxxxxxxxxx>, "Hugh Dickins" <hughd@xxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, "Ingo Molnar" <mingo@xxxxxxxxxx>, Sherry Cheung <SCheung@xxxxxxxxxx>, "Oliver O'Halloran" <oohall@xxxxxxxxx>, Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>, Dennis Zhou <dennisz@xxxxxx>, "Pavel Tatashin" <pasha.tatashin@xxxxxxxxxx>, <linux-mm@xxxxxxxxx>, <linux-kernel@xxxxxxxxxxxxxxx>
In-reply-to: <CAGXk5yoVMd9B=nvob7s=niCAQ9oHAX84eupF9Eet_dAk7WTStg@mail.gmail.com> (Wei Wang's message of "Fri, 16 Mar 2018 18:49:08 +0000")
References: <20180316182512.118361-1-wvw@google.com> <CAGXk5yoVMd9B=nvob7s=niCAQ9oHAX84eupF9Eet_dAk7WTStg@mail.gmail.com>
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.2 (gnu/linux)

Wei Wang <wvw@xxxxxxxxxx> writes:

> Android devices boot time benefits by bigger readahead window setting from
> init. This patch will make readahead window a config so early boot can
> benefit by it as well.

Can you change the source code of init to call ioctl(BLKRASET) early?

Best Regards,
Huang, Ying

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