Re: madvise(2) MADV_SEQUENTIAL behavior

From: Rik van Riel
Date: Thu Jul 17 2008 - 10:22:44 EST

On Thu, 17 Jul 2008 16:14:29 +1000
Nick Piggin <nickpiggin@xxxxxxxxxxxx> wrote:

> > It might encourage user space applications to start using
> > FADV_SEQUENTIAL or FADV_NOREUSE more often (as it would become
> > worthwhile to do so), and if they do (especially cron jobs), the problem
> > of the slow desktop in the morning would progressively solve itself.
> The slow desktop in the morning should not happen even without such a
> call, because the kernel should not throw out frequently used data (even
> if it is not quite so recent) in favour of streaming data.
> OK, I figure it doesn't do such a good job now, which is sad,

Do you have any tests in mind that we could use to decide
whether the patch I posted Tuesday would do a decent job
at protecting frequently used data from streaming data?

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