Ray Lee wrote:
On 7/10/07, Nick Piggin <[email protected]> wrote:
Matthew Hawkins wrote:
> On 7/11/07, Andrew Morton <[email protected]> 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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