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From: "Huang\, Ying" <ying.huang@intel.com>
Subject: Re: [PATCH] mm: add config for readahead window
References: <20180316182512.118361-1-wvw@google.com>
	<CAGXk5yoVMd9B=nvob7s=niCAQ9oHAX84eupF9Eet_dAk7WTStg@mail.gmail.com>
Date: Mon, 19 Mar 2018 10:36:58 +0800
In-Reply-To: <CAGXk5yoVMd9B=nvob7s=niCAQ9oHAX84eupF9Eet_dAk7WTStg@mail.gmail.com>
	(Wei Wang's message of "Fri, 16 Mar 2018 18:49:08 +0000")
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To: Wei Wang <wvw@google.com>
Cc: gregkh@linuxfoundation.org, Todd Poynor <toddpoynor@google.com>, Wei Wang <wei.vince.wang@gmail.com>, Andrew Morton <akpm@linux-foundation.org>, Dan Williams <dan.j.williams@intel.com>, Michal Hocko <mhocko@suse.com>, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>, Jan Kara <jack@suse.cz>, =?utf-8?B?SsOpcsO0bWU=?= Glisse <jglisse@redhat.com>, Hugh Dickins <hughd@google.com>, Matthew Wilcox <willy@infradead.org>, Ingo Molnar <mingo@kernel.org>, Sherry Cheung <SCheung@nvidia.com>, Oliver
 O'Halloran <oohall@gmail.com>, Andrey Ryabinin <aryabinin@virtuozzo.com>, Dennis Zhou <dennisz@fb.com>, Pavel
 Tatashin <pasha.tatashin@oracle.com>, linux-mm@kvack.org, linux-kernel@vger.kernel.org

Wei Wang <wvw@google.com> 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