Re: [PATCH] 2.4.20-rmap15a

[Andrew Morton]

Jens Axboe wrote:
> 
> On Sun, Dec 01 2002, Rik van Riel wrote:
> > > So, here my patch proposal. Ontop of 2.4.20-rmap15a.
> >
> > Looks good, now lets test it.  If the patch is as needed as you
> > say we should push it to marcelo ;)
> 
> Yes lets for heavens sake not fix the problem, merge the hack.

If it fails to find a merge or insert the current 2.4 elevator
will stick a read at the far end of the request queue.  That's
quite arbitrary, and is the worst possible thing to do with it.

read-latency2 will put the read a tunable distance from the head.
Add a few embellishments to avoid permanent writer starvation,
and that's basically all it does.

So rather than just keeping on calling it a "hack" could you please
describe what is actually wrong with the idea?