Nick Piggin wrote:
quoted text
> OK, this is where I start to worry. Swap prefetch AFAIKS doesn't fix
> the updatedb problem very well, because if updatedb has caused swapout
> then it has filled memory, and swap prefetch doesn't run unless there
> is free memory (not to mention that updatedb would have paged out other
> files as well).

It is *not* about updatedb. That is just a trivial case which people 
notice. Therefore fixing updatedb to be nicer, as was discussed at 
various points in this thread, is *not* the solution.
Most users are also *not*at*all* interested in kernel builds as a metric 
of system performance.

When I'm at work, I run a large, commercial, engineering application. 
While running, it takes most of the system memory (4GB and up), and it 
reads and writes very large files. Swap prefetch noticeably helps my 
desktop too. Can I measure it? Not sure. Can people on lkml fix the 
application? Certainly not.

Frank

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