• Nishanth Aravamudan's avatar
    powerpc/numa: Enable CONFIG_HAVE_MEMORYLESS_NODES · 64bb80d8
    Nishanth Aravamudan authored
    Based off fd1197f1 for ia64, enable CONFIG_HAVE_MEMORYLESS_NODES if
    NUMA. Initialize the local memory node in start_secondary.
    
    With this commit and the preceding to enable
    CONFIG_USER_PERCPU_NUMA_NODE_ID, which is a prerequisite, in a PowerKVM
    guest with the following topology:
    
    numactl --hardware
    available: 3 nodes (0-2)
    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 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 0 size: 1998 MB
    node 0 free: 521 MB
    node 1 cpus: 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114
    115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132
    133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150
    151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168
    169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186
    187 188 189 190 191 192 193 194 195 196 197 198 199
    node 1 size: 0 MB
    node 1 free: 0 MB
    node 2 cpus:
    node 2 size: 2039 MB
    node 2 free: 1739 MB
    node distances:
    node   0   1   2
      0:  10  40  40
      1:  40  10  40
      2:  40  40  10
    
    the unreclaimable slab is reduced by close to 130M:
    
    Before:
            Slab:             418176 kB
            SReclaimable:      26624 kB
            SUnreclaim:       391552 kB
    
    After:
            Slab:             298944 kB
            SReclaimable:      31744 kB
            SUnreclaim:       267200 kB
    Signed-off-by: default avatarNishanth Aravamudan <nacc@linux.vnet.ibm.com>
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    64bb80d8
Kconfig 27.7 KB