Re: -mm merge plans for 2.6.23

On 7/23/07, Jeremy Fitzhardinge [off-list ref] wrote:

Ray Lee wrote:

quoted

That said, I'm willing to run my day to day life through both a swap
prefetch kernel and a normal one. *However*, before I go through all
the work of instrumenting the damn thing, I'd really like Andrew (or
Linus) to lay out his acceptance criteria on the feature. Exactly what
*should* I be paying attention to? I've suggested keeping track of
process swapin delay total time, and comparing with and without. Is
that reasonable? Is it incomplete?

Um, isn't it up to you?

Huh? I'm not Linus or Andrew, with the power to merge a patch to the
2.6 kernel, so I think that the answer to that is a really clear 'No.'

4. Does it make anything worse?  A lot or a little?  Rare corner
cases, or a real world usage?  Again, numbers make the case most
strongly.

I can't say I've been following this particular feature very closely,
but these are the fundamental questions that need to be dealt with in
merging any significant change.  And as Nick says, historically point 4
is very important in VM tuning changes, because "obvious" improvements
have often ended up giving pathologically bad results on unexpected
workloads.

Dude. My whole question was *what* numbers. Please go back and read it
all again. Maybe I was unclear, but I really don't think so.

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