On Sun, 31 Oct 2010, Mulyadi Santosa wrote:
> On Sat, Oct 30, 2010 at 22:02, Robert P. J. Day <rpjday@xxxxxxxxxxxxxx> wrote:
> >
> > as the technical editor for robert love's book "linux kernel
> > development (3rd ed)", i'm interested in collecting any observations
> > related to kernel features that were introduced so recently, they
> > never made it into LKD3, simply being too new.
>
>
> Not sure if it's a feature or not, but I saw in 2.6.36, anticipatory
> I/O scheduler is no longer exist. Is that true? And what could be
> the reason?
i just checked the git log:
commit 492af6350a5ccf087e4964104a276ed358811458
Author: Jens Axboe <jens.axboe@xxxxxxxxxx>
Date: Sat Oct 3 09:37:51 2009 +0200
block: remove the anticipatory IO scheduler
AS is mostly a subset of CFQ, so there's little point in still
providing this separate IO scheduler. Hopefully at some point we
can get down to one single IO scheduler again, at least this brings
us closer by having only one intelligent IO scheduler.
Signed-off-by: Jens Axboe <jens.axboe@xxxxxxxxxx>
so i'll make a note of that. thanks, that's exactly the sort of thing
i'm looking for.
> Also, I saw XIP in ext2 filesystem. Quite neat..but again, why?
hmmm ... not sure, i'll look into that.
rday
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Robert P. J. Day Waterloo, Ontario, CANADA
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