Re: mmap vs fs cache

[Howard Chu]

Howard Chu wrote:
> Howard Chu wrote:
> > Howard Chu wrote:
> > > 2 questions:
> > >       why is there data in the FS cache that isn't owned by (the mmap of) the
> > > process that caused it to be paged in in the first place?
> > >       is there a tunable knob to discourage the page cache from stealing from the
> > > process?
> >
> > This Unmapped page cache control http://lwn.net/Articles/436010/ sounds like
> > it might have been helpful here. I.e., having a way to prioritize so that
> > unmapped cache pages get reclaimed in preference to mapped pages could help.
> > Though I still don't understand why these pages in the cache aren't mapped in
> > the first place.
> As implied by this post
> http://lkml.indiana.edu/hypermail/linux/kernel/0701.3/0354.html setting
> swappiness to 0 seems to give the desired effect of preventing mapped pages
> from being reclaimed.

I spoke too soon, after a few minutes of load the process size started 
shrinking again. My original questions still stand.

--
  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/
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