Re: [PATCH] swapin readahead and fixes

[Rik van Riel <H.H.vanRiel@phys.uu.nl>]

On Tue, 8 Dec 1998, Stephen C. Tweedie wrote:
> On Tue, 8 Dec 1998 03:31:25 +0100 (CET), Rik van Riel
> <H.H.vanRiel@phys.uu.nl> said:
> 
> > On a swapout, we will scan ahead of where we are (p->swap_address)
> > and swap out the next number of pages too. 
> 
> Yes, but be aware that for good performance you need to combine this
> with a mechanism to ensure swap space does not become fragmented,
> and you also need a swap-behind mechanism for sequential accesses
> (so that if an application is scanning a data set sequentially, the
> un-accessed space behind the current application "cursor" is being
> removed from memory just as fast as the stuff about to be accessed
> is being brought in).

And we also want a nice swapout clustering algorithm and
an awful lot of other stuff as well. I think we should
work on that stuff in the 'vacuum' period when 2.2 stabilizes
and 2.3 hasn't split off yet. Then we can merge the changes
in 2.3.very_small so we don't hold up the tree and give
something else the chance to hold it up again and again...

cheers,

Rik -- the flu hits, the flu hits, the flu hits -- MORE
+-------------------------------------------------------------------+
| Linux memory management tour guide.        H.H.vanRiel@phys.uu.nl |
| Scouting Vries cubscout leader.      http://www.phys.uu.nl/~riel/ |
+-------------------------------------------------------------------+

--
This is a majordomo managed list.  To unsubscribe, send a message with
the body 'unsubscribe linux-mm me@address' to: majordomo@kvack.org