On Mon, 2007-05-14 at 13:06 -0700, Christoph Lameter wrote: > 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.
Ah, indeed, that is the detail I missed. Yes that would work out. > There we check for SlabDebug and go to the debug: label. > There you can insert any fancy processing you want. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
