On 28.01.2014 [10:29:47 -0800], Nishanth Aravamudan wrote: > On 27.01.2014 [14:58:05 +0900], Joonsoo Kim wrote: > > On Fri, Jan 24, 2014 at 05:10:42PM -0800, Nishanth Aravamudan wrote: > > > On 24.01.2014 [16:25:58 -0800], David Rientjes wrote: > > > > On Fri, 24 Jan 2014, Nishanth Aravamudan wrote: > > > > > > > > > Thank you for clarifying and providing a test patch. I ran with this on > > > > > the system showing the original problem, configured to have 15GB of > > > > > memory. > > > > > > > > > > With your patch after boot: > > > > > > > > > > MemTotal: 15604736 kB > > > > > MemFree: 8768192 kB > > > > > Slab: 3882560 kB > > > > > SReclaimable: 105408 kB > > > > > SUnreclaim: 3777152 kB > > > > > > > > > > With Anton's patch after boot: > > > > > > > > > > MemTotal: 15604736 kB > > > > > MemFree: 11195008 kB > > > > > Slab: 1427968 kB > > > > > SReclaimable: 109184 kB > > > > > SUnreclaim: 1318784 kB > > > > > > > > > > > > > > > I know that's fairly unscientific, but the numbers are reproducible. > > > > > > > > > Hello, > > > > I think that there is one mistake on David's patch although I'm not sure > > that it is the reason for this result. > > > > With David's patch, get_partial() in new_slab_objects() doesn't work > > properly, because we only change node id in !node_match() case. If we > > meet just !freelist case, we pass node id directly to > > new_slab_objects(), so we always try to allocate new slab page > > regardless existence of partial pages. We should solve it. > > > > Could you try this one? > > This helps about the same as David's patch -- but I found the reason > why! ppc64 doesn't set CONFIG_HAVE_MEMORYLESS_NODES :) Expect a patch > shortly for that and one other case I found. > > This patch on its own seems to help on our test system by saving around > 1.5GB of slab. > > Tested-by: Nishanth Aravamudan <nacc@xxxxxxxxxxxxxxxxxx> > Acked-by: Nishanth Aravamudan <nacc@xxxxxxxxxxxxxxxxxx> > > with the caveat below. So what's the status of this patch? Christoph, do you think this is fine as it is? Thanks, Nish -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>