Messages in this thread | | | Date | Thu, 4 Feb 2010 11:13:15 -0600 (CST) | From | Christoph Lameter <> | Subject | Re: inodes: Support generic defragmentation |
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On Thu, 4 Feb 2010, Nick Piggin wrote:
> Well what I described is to do the slab pinning from the reclaim path > (rather than from slab calling into the subsystem). All slab locking > basically "innermost", so you can pretty much poke the slab layer as > much as you like from the subsystem.
Reclaim/defrag is called from the reclaim path (of the VM). We could enable a call from the fs reclaim code into the slab. But how would this work?
> After that, LRU on slabs should be fairly easy. Slab could provide a > private per-slab pointer for example that is managed by the caller. > Subsystem can then call into slab to find the objects.
Sure with some minor changes we could have a call that is giving you the list of neighboring objects in a slab, while locking it? Then you can look at the objects and decide which ones can be tossed and then do another call to release the objects and unlock the slab.
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