Re: [PATCH] [4/4] SLAB: Fix node add timer race in cache_reap

[David Rientjes]

On Thu, 25 Feb 2010, Pekka Enberg wrote:

> > > > > I'm just worried there is still an underlying problem here.
> > > > So am I. What caused the breakage that requires this patchset?
> > > Memory hotadd with a new node being onlined.
> > 
> > That used to work fine.
> 
> OK, can we get this issue resolved? The merge window is open and Christoph
> seems to be unhappy with the whole patch queue. I'd hate this bug fix to miss
> .34...
> 

I don't see how memory hotadd with a new node being onlined could have 
worked fine before since slab lacked any memory hotplug notifier until 
Andi just added it.

That said, I think the first and fourth patch in this series may be 
unnecessary if slab's notifier were to call slab_node_prepare() on 
MEM_GOING_ONLINE instead of MEM_ONLINE.  Otherwise, kswapd is already 
running, the zonelists for the new pgdat have been initialized, and the 
bit has been set in node_states[N_HIGH_MEMORY] without allocated 
cachep->nodelists[node] memory.
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