On Wed, Oct 24, 2012 at 12:43 PM, Lai Jiangshan <laijs@xxxxxxxxxxxxxx> wrote: > SLUB only fucus on the nodes which has normal memory, so ignore the other > node's hot-adding and hot-removing. > > Aka: if some memroy of a node(which has no onlined memory) is online, > but this new memory onlined is not normal memory(HIGH memory example), > we should not allocate kmem_cache_node for SLUB. > > And if the last normal memory is offlined, but the node still has memroy, > we should remove kmem_cache_node for that node.(current code delay it when > all of the memory is offlined) > > so we only do something when marg->status_change_nid_normal > 0. > marg->status_change_nid is not suitable here. > > The same problem doesn't exsit in SLAB, because SLAB allocates kmem_list3 > for every node even the node don't have normal memory, SLAB tolerates > kmem_list3 on alien nodes. SLUB only fucus on the nodes which has normal > memory, it don't tolerates alien kmem_cache_node, the patch makes > SLUB become self-compatible and avoid WARN and BUG in a rare condition. > > CC: David Rientjes <rientjes@xxxxxxxxxx> > Cc: Minchan Kim <minchan.kim@xxxxxxxxx> > CC: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx> > CC: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx> > CC: Rob Landley <rob@xxxxxxxxxxx> > CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > CC: Jiang Liu <jiang.liu@xxxxxxxxxx> > CC: Kay Sievers <kay.sievers@xxxxxxxx> > CC: Greg Kroah-Hartman <gregkh@xxxxxxx> > CC: Mel Gorman <mgorman@xxxxxxx> > CC: 'FNST-Wen Congyang' <wency@xxxxxxxxxxxxxx> > CC: linux-doc@xxxxxxxxxxxxxxx > CC: linux-kernel@xxxxxxxxxxxxxxx > CC: linux-mm@xxxxxxxxx > Signed-off-by: Lai Jiangshan <laijs@xxxxxxxxxxxxxx> The patch looks OK but changelog doesn't say what problem this fixes, how you found about it, and do we need this in stable. -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
