Re: [PATCH V2] MCE: fix an error of mce_bad_pages statistics

[Xishi Qiu]

On 2012/12/11 10:58, Andi Kleen wrote:

>> That sounds like overkill. There are not so many free pages in a
>> typical server system.
> 
> As Fengguang said -- memory error handling is tricky. Lots of things
> could be done in theory, but they all have a cost in testing and 
> maintenance. 
> 
> In general they are only worth doing if the situation is common and
> represents a significant percentage of the total pages of a relevant server
> workload.
> 
> -Andi
> 

Hi Andi and Fengguang,

"There are not so many free pages in a typical server system", sorry I don't
quite understand it.

buffered_rmqueue()
	prep_new_page()
		check_new_page()
			bad_page()

If we alloc 2^10 pages and one of them is a poisoned page, then the whole 4M
memory will be dropped.

Thanks,
Xishi Qiu

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/