Ray Lee wrote:
On 5/9/07, Nick Piggin <[email protected]> wrote:
Ray Lee wrote:
> On 5/9/07, Nick Piggin <[email protected]> wrote:
>
>> You said it helped with the updatedb problem. That says we should
look at
>> why it is going bad first, and for example improve use-once
algorithms.
>> After we do that, then swap prefetching might still help, which is
fine.
>
> Nick, if you're volunteering to do that analysis, then great. If not,
> then you're just providing a airy hope with nothing to back up when or
> if that work would ever occur.
I'd like to try helping. Tell me your problem.
Huh? You already stated one version of it above, namely updatedb. But
So a swapping problem with updatedb should be unusual and we'd like to see
if we can fix it without resorting to prefetching.
I know the theory behind swap prefetching, and I'm not saying it doesn't
work, so I'll snip the rest of that.
What's wrong with the use-once we have? What improvements are you talking
about?
You said, effectively: "Use-once could be improved to deal with
updatedb". I said I've been reading emails from Rik and others talking
about that for four years now, and we're still talking about it. Were
it merely updatedb, I'd say us userspace folk should step up and
rewrite the damn thing to amortize its work. However, I and others
feel it's only an example -- glaring, obviously -- of a more pervasive
issue. A small issue, to be sure!, but an issue nevertheless.
It isn't going to get fixed unless people complain about it. If you
cover the use-once problem with swap prefetching, then it will never
get fixed.
I don't think it is about energy or being mean, I'm just stating the
issues I have with it.
Nick, I in no way think you're being mean, and I'm sorry if I've given
you that impression. However, if you're just stating the issues you
have with it, then can I assume that you won't lobby against having
this experiment merged?
Anybody is free to merge anything into their kernel. And if somebody
asks for my issues with the swap prefetching patch, then I'll give
them :)
--
SUSE Labs, Novell Inc.
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