Re: [PATCH 3/3] slub: build detached freelist with look-ahead

[Jesper Dangaard Brouer <brouer@redhat.com>]

On Thu, 23 Jul 2015 15:34:24 +0900 Joonsoo Kim <iamjoonsoo.kim@lge.com> wrote:

> On Wed, Jul 22, 2015 at 01:28:19AM +0200, Jesper Dangaard Brouer wrote:
> > On Tue, 21 Jul 2015 08:50:36 -0500 (CDT)
> > Christoph Lameter <cl@linux.com> wrote:
> > 
> > > On Mon, 20 Jul 2015, Jesper Dangaard Brouer wrote:
> > > 
> > > > Yes, I think it is merged... how do I turn off merging?
> > > 
> > > linux/Documentation/kernel-parameters.txt
> > > 
> > >         slab_nomerge    [MM]
> > >                         Disable merging of slabs with similar size. May be
> > >                         necessary if there is some reason to distinguish
> > >                         allocs to different slabs. Debug options disable
> > >                         merging on their own.
> > >                         For more information see Documentation/vm/slub.txt.
> > 
> > I was hoping I could define this per slub runtime.  Any chance this
> > would be made possible?
> 
> It's not possible to set/reset slab merge in runtime. Once merging
> happens, one slab could have objects from different kmem_caches so we
> can't separate it cleanly. Current best approach is to prevent merging
> when creating new kmem_cache by introducing new slab flag
> like as SLAB_NO_MERGE.

Yes, the best option would be a new flag (e.g. SLAB_NO_MERGE) when
creating the kmem_cache.

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Sr. Network Kernel Developer at Red Hat
  Author of http://www.iptv-analyzer.org
  LinkedIn: http://www.linkedin.com/in/brouer

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