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From:   "Huang\, Ying" <ying.huang@intel.com>
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>
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")
Message-ID: <87zi34zt85.fsf@yhuang-dev.intel.com>
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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