Messages in this thread | | | Date | Thu, 28 Jun 2007 21:22:22 -0700 (PDT) | From | Christoph Lameter <> | Subject | Re: [PATCH] Containment measures for slab objects on scatter gather lists |
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On Thu, 28 Jun 2007, David Miller wrote:
> > Still a better solution would be to not use the slab allocator at all for > > the objects that are used to send commands to the devices. These are not > > permanent and grabbing a page from the pcp lists and putting it back is > > likely as fast as performing a kmalloc. > > Jens Axboe wants to get references to the page structs behind > kmalloc() allocated pages in his networking splice work.
You can get such a reference and then the slab page will be in limbo if all objects are freed until that reference is given up. The reference method is also use by kmem_cache_vacate() (but that is slab internal).
> We could make a special allocator in the networking that carves > chunks out of pages but I'm sure you'll find that about as stupid > and wasteful as I do :-)
Well then I guess this containment patch is as good as we can get. It makes sure that things do not get out of hand.
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