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Message-Id: <1431597783.26797.1@cpanel21.proisp.no> Date: Thu, 14 May 2015 18:03:03 +0800 From: Daniel J Blueman <daniel@...ascale.com> To: Mel Gorman <mgorman@...e.de>, nzimmer <nzimmer@....com> Cc: Andrew Morton <akpm@...ux-foundation.org>, Waiman Long <waiman.long@...com>, Dave Hansen <dave.hansen@...el.com>, Scott Norton <scott.norton@...com>, Linux-MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>, Steffen Persvold <sp@...ascale.com> Subject: Re: [PATCH] mm: meminit: Finish initialisation of struct pages before basic setup On Thu, May 14, 2015 at 12:31 AM, Mel Gorman <mgorman@...e.de> wrote: > On Wed, May 13, 2015 at 10:53:33AM -0500, nzimmer wrote: >> I am just noticed a hang on my largest box. >> I can only reproduce with large core counts, if I turn down the >> number of cpus it doesn't have an issue. >> > > Odd. The number of core counts should make little a difference as only > one CPU per node should be in use. Does sysrq+t give any indication > how > or where it is hanging? I was seeing the same behaviour of 1000ms increasing to 5500ms [1]; this suggests either lock contention or O(n) behaviour. Nathan, can you check with this ordering of patches from Andrew's cache [2]? I was getting hanging until I a found them all. I'll follow up with timing data. Thanks, Daniel -- [1] [ 73.076117] node 2 initialised, 7732961 pages in 1060ms [ 73.077184] node 38 initialised, 7732961 pages in 1060ms [ 73.079626] node 146 initialised, 7732961 pages in 1050ms [ 73.093488] node 62 initialised, 7732961 pages in 1080ms [ 73.091557] node 3 initialised, 7732962 pages in 1080ms [ 73.100000] node 186 initialised, 7732961 pages in 1040ms [ 73.095731] node 4 initialised, 7732961 pages in 1080ms [ 73.090289] node 50 initialised, 7732961 pages in 1080ms [ 73.094005] node 158 initialised, 7732961 pages in 1050ms [ 73.095421] node 159 initialised, 7732962 pages in 1050ms [ 73.090324] node 52 initialised, 7732961 pages in 1080ms [ 73.099056] node 5 initialised, 7732962 pages in 1080ms [ 73.090116] node 160 initialised, 7732961 pages in 1050ms [ 73.161051] node 157 initialised, 7732962 pages in 1120ms [ 73.193565] node 161 initialised, 7732962 pages in 1160ms [ 73.212456] node 26 initialised, 7732961 pages in 1200ms [ 73.222904] node 0 initialised, 6686488 pages in 1210ms [ 73.242165] node 140 initialised, 7732961 pages in 1210ms [ 73.254230] node 156 initialised, 7732961 pages in 1220ms [ 73.284634] node 1 initialised, 7732962 pages in 1270ms [ 73.305301] node 141 initialised, 7732962 pages in 1280ms [ 73.322845] node 28 initialised, 7732961 pages in 1310ms [ 73.321757] node 142 initialised, 7732961 pages in 1290ms [ 73.327677] node 138 initialised, 7732961 pages in 1300ms [ 73.413597] node 176 initialised, 7732961 pages in 1370ms [ 73.455552] node 139 initialised, 7732962 pages in 1420ms [ 73.475356] node 143 initialised, 7732962 pages in 1440ms [ 73.547202] node 32 initialised, 7732961 pages in 1530ms [ 73.579591] node 104 initialised, 7732961 pages in 1560ms [ 73.618065] node 174 initialised, 7732961 pages in 1570ms [ 73.624918] node 178 initialised, 7732961 pages in 1580ms [ 73.649024] node 175 initialised, 7732962 pages in 1610ms [ 73.654110] node 105 initialised, 7732962 pages in 1630ms [ 73.670589] node 106 initialised, 7732961 pages in 1650ms [ 73.739682] node 102 initialised, 7732961 pages in 1720ms [ 73.769639] node 86 initialised, 7732961 pages in 1750ms [ 73.775573] node 44 initialised, 7732961 pages in 1760ms [ 73.772955] node 177 initialised, 7732962 pages in 1740ms [ 73.804390] node 34 initialised, 7732961 pages in 1790ms [ 73.819370] node 30 initialised, 7732961 pages in 1810ms [ 73.847882] node 98 initialised, 7732961 pages in 1830ms [ 73.867545] node 33 initialised, 7732962 pages in 1860ms [ 73.877964] node 107 initialised, 7732962 pages in 1860ms [ 73.906256] node 103 initialised, 7732962 pages in 1880ms [ 73.945581] node 100 initialised, 7732961 pages in 1930ms [ 73.947024] node 96 initialised, 7732961 pages in 1930ms [ 74.186208] node 116 initialised, 7732961 pages in 2170ms [ 74.220838] node 68 initialised, 7732961 pages in 2210ms [ 74.252341] node 46 initialised, 7732961 pages in 2240ms [ 74.274795] node 118 initialised, 7732961 pages in 2260ms [ 74.337544] node 14 initialised, 7732961 pages in 2320ms [ 74.350819] node 22 initialised, 7732961 pages in 2340ms [ 74.350332] node 69 initialised, 7732962 pages in 2340ms [ 74.362683] node 211 initialised, 7732962 pages in 2310ms [ 74.360617] node 70 initialised, 7732961 pages in 2340ms [ 74.369137] node 66 initialised, 7732961 pages in 2360ms [ 74.378242] node 115 initialised, 7732962 pages in 2360ms [ 74.404221] node 213 initialised, 7732962 pages in 2350ms [ 74.420901] node 210 initialised, 7732961 pages in 2370ms [ 74.430049] node 35 initialised, 7732962 pages in 2420ms [ 74.436007] node 48 initialised, 7732961 pages in 2420ms [ 74.480595] node 71 initialised, 7732962 pages in 2460ms [ 74.485700] node 67 initialised, 7732962 pages in 2480ms [ 74.502627] node 31 initialised, 7732962 pages in 2490ms [ 74.542220] node 16 initialised, 7732961 pages in 2530ms [ 74.547936] node 128 initialised, 7732961 pages in 2520ms [ 74.634374] node 214 initialised, 7732961 pages in 2580ms [ 74.654389] node 88 initialised, 7732961 pages in 2630ms [ 74.722833] node 117 initialised, 7732962 pages in 2700ms [ 74.735002] node 148 initialised, 7732961 pages in 2700ms [ 74.742725] node 12 initialised, 7732961 pages in 2730ms [ 74.749319] node 194 initialised, 7732961 pages in 2700ms [ 74.767979] node 24 initialised, 7732961 pages in 2750ms [ 74.769465] node 114 initialised, 7732961 pages in 2750ms [ 74.796973] node 134 initialised, 7732961 pages in 2770ms [ 74.818164] node 15 initialised, 7732962 pages in 2810ms [ 74.844852] node 18 initialised, 7732961 pages in 2830ms [ 74.866123] node 110 initialised, 7732961 pages in 2850ms [ 74.898255] node 215 initialised, 7730688 pages in 2840ms [ 74.903623] node 136 initialised, 7732961 pages in 2880ms [ 74.911107] node 144 initialised, 7732961 pages in 2890ms [ 74.918757] node 212 initialised, 7732961 pages in 2870ms [ 74.935333] node 182 initialised, 7732961 pages in 2880ms [ 74.958147] node 42 initialised, 7732961 pages in 2950ms [ 74.964989] node 108 initialised, 7732961 pages in 2950ms [ 74.965482] node 112 initialised, 7732961 pages in 2950ms [ 75.034787] node 184 initialised, 7732961 pages in 2980ms [ 75.051242] node 45 initialised, 7732962 pages in 3040ms [ 75.047169] node 152 initialised, 7732961 pages in 3020ms [ 75.062834] node 179 initialised, 7732962 pages in 3010ms [ 75.076528] node 145 initialised, 7732962 pages in 3040ms [ 75.076613] node 25 initialised, 7732962 pages in 3070ms [ 75.073086] node 164 initialised, 7732961 pages in 3040ms [ 75.079674] node 149 initialised, 7732962 pages in 3050ms [ 75.092015] node 113 initialised, 7732962 pages in 3070ms [ 75.096325] node 80 initialised, 7732961 pages in 3080ms [ 75.131380] node 92 initialised, 7732961 pages in 3110ms [ 75.142147] node 10 initialised, 7732961 pages in 3130ms [ 75.151041] node 51 initialised, 7732962 pages in 3140ms [ 75.159074] node 130 initialised, 7732961 pages in 3130ms [ 75.162616] node 166 initialised, 7732961 pages in 3130ms [ 75.193557] node 82 initialised, 7732961 pages in 3170ms [ 75.254801] node 84 initialised, 7732961 pages in 3240ms [ 75.303028] node 64 initialised, 7732961 pages in 3290ms [ 75.299739] node 49 initialised, 7732962 pages in 3290ms [ 75.314231] node 21 initialised, 7732962 pages in 3300ms [ 75.371298] node 53 initialised, 7732962 pages in 3360ms [ 75.394569] node 95 initialised, 7732962 pages in 3380ms [ 75.441101] node 23 initialised, 7732962 pages in 3430ms [ 75.433080] node 19 initialised, 7732962 pages in 3430ms [ 75.446076] node 173 initialised, 7732962 pages in 3410ms [ 75.445816] node 99 initialised, 7732962 pages in 3430ms [ 75.470330] node 87 initialised, 7732962 pages in 3450ms [ 75.502334] node 8 initialised, 7732961 pages in 3490ms [ 75.508300] node 206 initialised, 7732961 pages in 3460ms [ 75.540253] node 132 initialised, 7732961 pages in 3510ms [ 75.615453] node 183 initialised, 7732962 pages in 3560ms [ 75.632576] node 78 initialised, 7732961 pages in 3610ms [ 75.647753] node 85 initialised, 7732962 pages in 3620ms [ 75.688955] node 90 initialised, 7732961 pages in 3670ms [ 75.694522] node 200 initialised, 7732961 pages in 3640ms [ 75.688790] node 43 initialised, 7732962 pages in 3680ms [ 75.694540] node 94 initialised, 7732961 pages in 3680ms [ 75.697149] node 29 initialised, 7732962 pages in 3690ms [ 75.693590] node 111 initialised, 7732962 pages in 3680ms [ 75.715829] node 56 initialised, 7732961 pages in 3700ms [ 75.718427] node 97 initialised, 7732962 pages in 3700ms [ 75.741643] node 147 initialised, 7732962 pages in 3710ms [ 75.773613] node 170 initialised, 7732961 pages in 3740ms [ 75.802874] node 208 initialised, 7732961 pages in 3750ms [ 75.804409] node 58 initialised, 7732961 pages in 3790ms [ 75.853438] node 126 initialised, 7732961 pages in 3830ms [ 75.888167] node 167 initialised, 7732962 pages in 3850ms [ 75.912656] node 172 initialised, 7732961 pages in 3870ms [ 75.956540] node 93 initialised, 7732962 pages in 3940ms [ 75.988819] node 127 initialised, 7732962 pages in 3960ms [ 76.062198] node 201 initialised, 7732962 pages in 4010ms [ 76.091769] node 47 initialised, 7732962 pages in 4080ms [ 76.119749] node 162 initialised, 7732961 pages in 4080ms [ 76.122797] node 6 initialised, 7732961 pages in 4110ms [ 76.225916] node 153 initialised, 7732962 pages in 4190ms [ 76.219855] node 81 initialised, 7732962 pages in 4200ms [ 76.236116] node 150 initialised, 7732961 pages in 4210ms [ 76.245349] node 180 initialised, 7732961 pages in 4190ms [ 76.248827] node 17 initialised, 7732962 pages in 4240ms [ 76.258801] node 13 initialised, 7732962 pages in 4250ms [ 76.259943] node 122 initialised, 7732961 pages in 4240ms [ 76.277480] node 196 initialised, 7732961 pages in 4230ms [ 76.320830] node 41 initialised, 7732962 pages in 4310ms [ 76.351667] node 129 initialised, 7732962 pages in 4320ms [ 76.353488] node 202 initialised, 7732961 pages in 4310ms [ 76.376753] node 165 initialised, 7732962 pages in 4340ms [ 76.381807] node 124 initialised, 7732961 pages in 4350ms [ 76.419952] node 171 initialised, 7732962 pages in 4380ms [ 76.431242] node 168 initialised, 7732961 pages in 4390ms [ 76.441324] node 89 initialised, 7732962 pages in 4420ms [ 76.440720] node 155 initialised, 7732962 pages in 4400ms [ 76.459715] node 120 initialised, 7732961 pages in 4440ms [ 76.483986] node 205 initialised, 7732962 pages in 4430ms [ 76.493284] node 151 initialised, 7732962 pages in 4460ms [ 76.491437] node 60 initialised, 7732961 pages in 4480ms [ 76.526620] node 74 initialised, 7732961 pages in 4510ms [ 76.543761] node 131 initialised, 7732962 pages in 4510ms [ 76.549562] node 39 initialised, 7732962 pages in 4540ms [ 76.563861] node 11 initialised, 7732962 pages in 4550ms [ 76.598775] node 54 initialised, 7732961 pages in 4590ms [ 76.602006] node 123 initialised, 7732962 pages in 4570ms [ 76.619856] node 76 initialised, 7732961 pages in 4600ms [ 76.631418] node 198 initialised, 7732961 pages in 4580ms [ 76.665415] node 188 initialised, 7732961 pages in 4610ms [ 76.669178] node 63 initialised, 7732962 pages in 4660ms [ 76.683646] node 101 initialised, 7732962 pages in 4670ms [ 76.710780] node 192 initialised, 7732961 pages in 4660ms [ 76.736743] node 121 initialised, 7732962 pages in 4720ms [ 76.743800] node 199 initialised, 7732962 pages in 4700ms [ 76.750663] node 20 initialised, 7732961 pages in 4740ms [ 76.763045] node 135 initialised, 7732962 pages in 4730ms [ 76.768216] node 137 initialised, 7732962 pages in 4740ms [ 76.800135] node 181 initialised, 7732962 pages in 4750ms [ 76.811215] node 27 initialised, 7732962 pages in 4800ms [ 76.857405] node 125 initialised, 7732962 pages in 4820ms [ 76.853750] node 163 initialised, 7732962 pages in 4820ms [ 76.882975] node 59 initialised, 7732962 pages in 4870ms [ 76.920121] node 9 initialised, 7732962 pages in 4910ms [ 76.934824] node 189 initialised, 7732962 pages in 4880ms [ 76.951223] node 154 initialised, 7732961 pages in 4920ms [ 76.953897] node 203 initialised, 7732962 pages in 4900ms [ 76.952558] node 75 initialised, 7732962 pages in 4930ms [ 76.985480] node 119 initialised, 7732962 pages in 4970ms [ 77.036089] node 195 initialised, 7732962 pages in 4980ms [ 77.039996] node 55 initialised, 7732962 pages in 5030ms [ 77.067989] node 109 initialised, 7732962 pages in 5040ms [ 77.066236] node 7 initialised, 7732962 pages in 5060ms [ 77.068709] node 65 initialised, 7732962 pages in 5060ms [ 77.097859] node 79 initialised, 7732962 pages in 5080ms [ 77.096219] node 169 initialised, 7732962 pages in 5060ms [ 77.125113] node 83 initialised, 7732962 pages in 5110ms [ 77.139507] node 37 initialised, 7732962 pages in 5130ms [ 77.143280] node 77 initialised, 7732962 pages in 5120ms [ 77.226494] node 73 initialised, 7732962 pages in 5200ms [ 77.281584] node 190 initialised, 7732961 pages in 5230ms [ 77.314794] node 204 initialised, 7732961 pages in 5260ms [ 77.328577] node 72 initialised, 7732961 pages in 5310ms [ 77.335743] node 36 initialised, 7732961 pages in 5320ms [ 77.360573] node 40 initialised, 7732961 pages in 5350ms [ 77.368712] node 207 initialised, 7732962 pages in 5320ms [ 77.387708] node 91 initialised, 7732962 pages in 5370ms [ 77.385143] node 57 initialised, 7732962 pages in 5380ms [ 77.391785] node 191 initialised, 7732962 pages in 5340ms [ 77.479970] node 185 initialised, 7732962 pages in 5430ms [ 77.491865] node 61 initialised, 7732962 pages in 5480ms [ 77.489255] node 133 initialised, 7732962 pages in 5460ms [ 77.502111] node 197 initialised, 7732962 pages in 5450ms [ 77.507136] node 193 initialised, 7732962 pages in 5460ms [ 77.523739] node 209 initialised, 7732962 pages in 5470ms [ 77.537131] node 187 initialised, 7732962 pages in 5490ms -- [2] http://ozlabs.org/~akpm/mmots/broken-out/memblock-introduce-a-for_each_reserved_mem_region-iterator.patch http://ozlabs.org/~akpm/mmots/broken-out/mm-meminit-move-page-initialization-into-a-separate-function.patch http://ozlabs.org/~akpm/mmots/broken-out/mm-meminit-only-set-page-reserved-in-the-memblock-region.patch http://ozlabs.org/~akpm/mmots/broken-out/mm-page_alloc-pass-pfn-to-__free_pages_bootmem.patch http://ozlabs.org/~akpm/mmots/broken-out/mm-meminit-make-__early_pfn_to_nid-smp-safe-and-introduce-meminit_pfn_in_nid.patch http://ozlabs.org/~akpm/mmots/broken-out/mm-meminit-inline-some-helper-functions.patch http://ozlabs.org/~akpm/mmots/broken-out/mm-meminit-inline-some-helper-functions-fix.patch http://ozlabs.org/~akpm/mmots/broken-out/mm-meminit-initialise-a-subset-of-struct-pages-if-config_deferred_struct_page_init-is-set.patch http://ozlabs.org/~akpm/mmots/broken-out/mm-meminit-initialise-remaining-struct-pages-in-parallel-with-kswapd.patch http://ozlabs.org/~akpm/mmots/broken-out/mm-meminit-minimise-number-of-pfn-page-lookups-during-initialisation.patch http://ozlabs.org/~akpm/mmots/broken-out/x86-mm-enable-deferred-struct-page-initialisation-on-x86-64.patch http://ozlabs.org/~akpm/mmots/broken-out/mm-meminit-free-pages-in-large-chunks-where-possible.patch http://ozlabs.org/~akpm/mmots/broken-out/mm-meminit-reduce-number-of-times-pageblocks-are-set-during-struct-page-init.patch http://ozlabs.org/~akpm/mmots/broken-out/mm-meminit-remove-mminit_verify_page_links.patch http://ozlabs.org/~akpm/mmots/broken-out/mm-meminit-initialise-a-subset-of-struct-pages-if-config_deferred_struct_page_init-is-set-fix.patch http://ozlabs.org/~akpm/mmots/broken-out/mm-meminit-finish-initialisation-of-struct-pages-before-basic-setup.patch http://ozlabs.org/~akpm/mmots/broken-out/mm-meminit-finish-initialisation-of-struct-pages-before-basic-setup-fix.patch http://ozlabs.org/~akpm/mmots/broken-out/mm-meminit-reduce-number-of-times-pageblocks-are-set-during-struct-page-init-fix.patch http://ozlabs.org/~akpm/mmots/broken-out/mm-meminit-inline-some-helper-functions-fix2.patch -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a 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