Re: O->A loan

[Mindaugas Rasiukevicius <rmind%netbsd.org@localhost>]

yamt%mwd.biglobe.ne.jp@localhost (YAMAMOTO Takashi) wrote:
> hi,
> 
> i'd like to to either fix or remove O->A page loaning.
> 
> the biggest problem is the lack of users.  thus no way to test.
> any ideas?

After looking at O->A loaning code in yamt-pagecache branch, looking at
the benchmark results by Jaime (some data was sent privately, I think)
and contemplating about this mechanism - I tend to think that O->A loaning
should be removed.  It is a significant code complexity in UVM with some
special casing and benchmarks indicate that the benefit is somewhat small.

Does not seem to be worth, does it?

> 
> YAMAMOTO Takashi

-- 
Mindaugas