Re: [PATCH v2] mm/mremap: Don't account pages in vma_to_resize()

[Dmitry Safonov]

On 7/21/21 9:05 PM, Andrew Morton wrote:
> On Wed, 21 Jul 2021 14:21:54 +0100 Dmitry Safonov <0x7f454c46@xxxxxxxxx> wrote:
> 
>>> Let's not do this.
>>> Account memory in mremap() fast-path for growing VMAs or in move_vma()
>>> for actually moving things. The same simpler way as it's done by
>>> vm_stat_account(), but with a difference to call
>>> security_vm_enough_memory_mm() before copying/adjusting VMA.
>>>
>>> Originally noticed by Chen Wandun:
>>> https://lkml.kernel.org/r/20210717101942.120607-1-chenwandun@xxxxxxxxxx
>>
>> The patch by Chen Wandun still makes sense with this v2.
>> Heh :-)
> 
> Should
> https://lkml.kernel.org/r/20210717101942.120607-1-chenwandun@xxxxxxxxxx
> still be applied then?  Did you ack it?
> 

Yes, please keep that patch with
Acked-by: Dmitry Safonov <dima@xxxxxxxxxx>

This one comes on the top to correct accounting for MREMAP_DONTUNMAP.

Thanks,
          Dmitry