On 06.01.17 08:37:25, Ard Biesheuvel wrote: > Any comments on the performance impact (including boot time) ? I did a kernel compile test and kernel mode time increases by about 2.2%. Though this is already significant, we need a more suitable mem benchmark here for further testing. For boot time I dont see significant changes. -Robert Boot times: pfn_valid_within(): [ 25.929134] [ 25.548830] [ 25.503225] early_pfn_valid() v3: [ 25.773814] [ 25.548428] [ 25.765290] Kernel compile times (3 runs each): pfn_valid_within(): real 6m4.088s user 372m57.607s sys 16m55.158s real 6m1.532s user 372m48.453s sys 16m50.370s real 6m4.061s user 373m18.753s sys 16m57.027s early_pfn_valid() v3: real 6m3.261s user 373m15.816s sys 16m30.019s real 6m2.980s user 373m9.019s sys 16m32.992s real 6m2.574s user 372m45.146s sys 16m33.218s -- 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>