[lkml]   [2008]   [Mar]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] x86_64: early memtest to find bad ram

* Yinghai Lu <> wrote:

> do simple memtest after init_memory_mapping
> use find_e820_area_size to find all ram range that is not reserved.
> and do some simple bits test to find some bad ram.
> if find some bad ram, use reserve_early to exclude that range.

very nice patch! I always thought that this was the proper way to do
memtest - and we could in fact also do something like this after SMP
bringup, and hit the memory bus via multiple CPUs. [that will need a
different enumeration though than e820 maps]

one structural observation: please make this unified functionality, so
that 32-bit kernels can make use of it too.

a small style nit from scripts/

> +// printk(KERN_DEBUG "find_e820_area_size : e820 %d [%llx, %lx]\n", i, ei->addr, ei_last);

remove such lines or make them pr_debug(). (checkpatch also found more
such cases)

also, please add a CONFIG_BOOTPARAM_MEMTEST=y option so that
distributions can enable this by default in their debug kernels.

i've applied your current version to get some testing, please send delta
patches against x86/latest.


 \ /
  Last update: 2008-03-21 13:05    [W:0.146 / U:0.036 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site