Messages in this thread | | | Date | Tue, 25 Sep 2012 16:28:11 +0000 | From | Christoph Lameter <> | Subject | Re: [PATCH v3 06/16] memcg: infrastructure to match an allocation to the right cache |
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On Tue, 25 Sep 2012, Glauber Costa wrote:
> >> 1) Do like the events mechanism and allocate this in a separate > >> structure. Add a pointer chase in the access, and I don't think it helps > >> much because it gets allocated anyway. But we could at least > >> defer it to the time when we limit the cache. > > > > Start at some reasonable size and then double it as usage grows? How > > many kmem_caches do we typically end up using? > > > > So my Fedora box here, recently booted on a Fedora kernel, will have 111 > caches. How would 150 sound to you?
Some drivers/subsystems can dynamically create slabs as needed for new devices or instances of metadata. You cannot use a fixed size array and cannot establish an upper boundary for the number of slabs on the system.
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