Re: mce: a question about memory_failure_early_kill in memory_failure()

[Naoya Horiguchi]

On Tue, Apr 19, 2016 at 07:13:34PM +0800, Xishi Qiu wrote:
> /proc/sys/vm/memory_failure_early_kill
> 
> 1: means kill all processes that have the corrupted and not reloadable page mapped.
> 0: means only unmap the corrupted page from all processes and only kill a process
> who tries to access it.
> 
> If set memory_failure_early_kill to 0, and memory_failure() has been called.
> memory_failure()
> 	hwpoison_user_mappings()
> 		collect_procs()  // the task(with no PF_MCE_PROCESS flag) is not in the tokill list
> 			try_to_unmap()
> 
> If the task access the memory, there will be a page fault,
> so the task can not access the original page again, right?

Yes, right. That's the behavior in default "late kill" case.

I'm guessing that you might have a more specific problem around this code.
If so, please feel free to ask with detail.

Thanks,
Naoya Horiguchi