Messages in this thread | | | Date | Mon, 14 May 2007 13:06:02 -0700 (PDT) | From | Christoph Lameter <> | Subject | Re: [PATCH 0/5] make slab gfp fair |
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On Mon, 14 May 2007, Peter Zijlstra wrote:
> > Hmmm.. Maybe we could do that.... But what I had in mind was simply to > > set a page flag (DebugSlab()) if you know in alloc_slab that the slab > > should be only used for emergency allocation. If DebugSlab is set then the > > fastpath will not be called. You can trap all allocation attempts and > > insert whatever fancy logic you want in the debug path since its not > > performance critical. > > I might have missed some detail when I looked at SLUB, but I did not see > how setting SlabDebug would trap subsequent allocations to that slab.
Ok its not evident in slab_alloc. But if SlabDebug is set then page->lockless_list is always NULL and we always fall back to __slab_alloc. There we check for SlabDebug and go to the debug: label. There you can insert any fancy processing you want.
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