lkml.org 
[lkml]   [2024]   [May]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 3/3] mm/memory-failure: send SIGBUS in the event of thp split fail
From
Date
On 2024/5/9 0:56, Jane Chu wrote:
> On 5/8/2024 2:03 AM, Miaohe Lin wrote:
>
>> On 2024/5/2 7:24, Jane Chu wrote:
>>> When handle hwpoison in a GUP longterm pin'ed thp page,
>>> try_to_split_thp_page() will fail. And at this point, there is little else
>>> the kernel could do except sending a SIGBUS to the user process, thus
>>> give it a chance to recover.
>> It seems the user process will still receive SIGBUS via kill_accessing_process()
>> when (re-)access thp later. So they should have a chance to recover already.
>> Or am I miss something?
>
> The concern is about real UE consumption in which case, it's desirable to kill the process ASAP without having to relying on subsequent access.  Also to honor processes' MCE-early-kill request. kill_accessing_process() is very conservative in that, it doesn't check other processes that have the poisoned page mapped.

I see. Thanks for your explanation.
Thanks.
.

>
> thanks,
>
> -jane
>
>>
>> Thanks.
>> .
>>
>>
> .


\
 
 \ /
  Last update: 2024-05-09 10:52    [W:0.165 / U:0.036 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site