On Fri, 2007-07-27 at 03:00 -0700, Andrew Morton wrote:
> On Fri, 27 Jul 2007 01:47:49 -0700 Andrew Morton <[EMAIL PROTECTED]> wrote:
>
> > More sophisticated testing is needed - there's something in
> > ext3-tools which will mmap, page in and hold a file for you.
>
> So much for that theory. afaict mmapped, active pagecache is immune to
> updatedb activity. It just sits there while updatedb continues munching
> away at the slab and blockdev pagecache which it instantiated. I assume
> we're never getting the VM into enough trouble to tip it over the
> start-reclaiming-mapped-pages threshold (ie: /proc/sys/vm/swappiness).
>
> Start the updatedb on this 128MB machine with 80MB of mapped pagecache, it
> falls to 55MB fairly soon and then never changes.
>
> So hrm. Are we sure that updatedb is the problem? There are quite a few
> heavyweight things which happen in the wee small hours.
The balance in _my_ world seems just fine. I don't let any of those
system maintenance things run while I'm using the system, and it doesn't
bother me if my working set has to be reconstructed after heavy-weight
maintenance things are allowed to run. I'm not seeing anything I
wouldn't expect to see when running a job the size of updatedb.
-Mike
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