On Fri, Mar 16, 2018, 14:33 Andrew Morton <akpm@linux-foundation.org> wrote:

> On Fri, 16 Mar 2018 11:25:08 -0700 Wei Wang <wvw@google.com> wrote:
>
> > Change VM_MAX_READAHEAD value from the default 128KB to a configurable
> > value. This will allow the readahead window to grow to a maximum size
> > bigger than 128KB during boot, which could benefit to sequential read
> > throughput and thus boot performance.
>
> You can presently run ioctl(BLKRASET) against the block device?
>

Yeah we are doing tuning in userland after init. But this is something we
thought could help in very early stage.

>