Re: ~500 megs cached yet 2.6.5 goes into swap hell

Marc Singer
2004-04-29T14:48:12Z

On Thu, Apr 29, 2004 at 11:43:25AM +0200, Helge Hafting wrote:
> Brett E. wrote:
> [...]
> >Or how about "Use ALL the cache you want Mr. Kernel. But when I want
> >more physical memory pages, just reap cache pages and only swap out when
> >the cache is down to a certain size(configurable, say 100megs or
> >something)."
>
> Problem: reaping cache is equivalent to swapping in some cases.
> The cache isn't merely "files read & written".
> It is also all your executable code. Code is not different from
> files being read at all. Dumping too much cache will dump the
> code you're executing, and then it have to be reloaded from disk.

Hmm. I was under the impression that mapped pages were code and
unmapped pages were IO page cache. Are you suggesting that code is
duplicated?