Re: [ck] Re: -mm merge plans for 2.6.23

[Nick Piggin]

Ray Lee wrote:
> On 7/10/07, Nick Piggin <nickpiggin@xxxxxxxxxxxx> wrote:
>
> > Matthew Hawkins wrote:
> > > On 7/11/07, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> >
> > > Anyhow with swap prefetch, applications that may have been sitting
> > > there idle for a while become responsive in the single-digit seconds
> > > rather than double-digit or worse.  The same goes for a morning wakeup
> > > (ie after nightly cron jobs throw things out)
> >
> > OK that's a good data point. It would be really good to be able to
> > do an analysis on your overnight IO patterns and the corresponding
> > memory reclaim behaviour and see why things are getting evicted.
>
>
> Eviction can happen for multiple reasons, as I'm sure you're painfully
> aware. It can happen because of poor balancing choices, or it can

s/balancing/reclaim, yes. And for the nightly cron job case, this is
could quite possibly be the cause. At least updatedb should be fairly
easy to apply use-once heuristics for, so if they're not working then
we should hopefully be able to improve it.

--
SUSE Labs, Novell Inc.
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