Re: [External] [PATCH] hostmem: Add clear option to file backend

[Feiran Zheng]

> On 2 Mar 2023, at 11:31, David Hildenbrand <david@redhat.com> wrote:
> 
> On 02.03.23 12:09, Fam Zheng wrote:
>> This adds a memset to clear the backing memory. This is useful in the
>> case of PMEM DAX to drop dirty data, if the backing memory is handed
>> over from a previous application or firmware which didn't clean up
>> before exiting.
> 
> Why can't the VM manager do that instead? If you have a file that's certainly 
> easily possible.


Hi David,

Technically yes, but I have a simple VM manager here which wants to avoid 
replicating the same mmap code, such as handling the flags depending on 
share=on|off,hugepages=on|off. All in all this approach requires the least 
additional code to achieve it.

Thanks,
Fam

> 
> -- 
> Thanks,
> 
> David / dhildenb
>