On 22.07.2014 [14:43:11 -0700], Nishanth Aravamudan wrote: > Hi David, <snip> > on powerpc now, things look really good. On a KVM instance with the > following topology: > > available: 2 nodes (0-1) > node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 > node 0 size: 0 MB > node 0 free: 0 MB > node 1 cpus: 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 > node 1 size: 16336 MB > node 1 free: 14274 MB > node distances: > node 0 1 > 0: 10 40 > 1: 40 10 > > 3.16.0-rc6 gives: > > Slab: 1039744 kB > SReclaimable: 38976 kB > SUnreclaim: 1000768 kB <snip> > Adding my patch on top of Joonsoo's and the revert, I get: > > Slab: 411776 kB > SReclaimable: 40960 kB > SUnreclaim: 370816 kB > > So CONFIG_SLUB still uses about 3x as much slab memory, but it's not so > much that we are close to OOM with small VM/LPAR sizes. Just to clarify/add one more datapoint, with a balanced topology: available: 2 nodes (0-1) node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 node 0 size: 8154 MB node 0 free: 8075 MB node 1 cpus: 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 node 1 size: 8181 MB node 1 free: 7776 MB node distances: node 0 1 0: 10 40 1: 40 10 I see the following for my patch + Joonsoo's + the revert: Slab: 495872 kB SReclaimable: 46528 kB SUnreclaim: 449344 kB (Although these numbers fluctuate quite a bit between 250M and 500M), which indicates that the memoryless node slab consumption is now on-par with a populated topology. And both are still more than CONFIG_SLAB requires. 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>