Re: Cross Memory Attach v4

[Daniel J Blueman]

On Jul 27, 11:30 am, Christopher Yeoh <cyeoh@xxxxxxxxxxx> wrote:
> Hi Andrew,
>
> Here's an updated version of the Cross Memory Attach patch. Changes
> since the v3:
>
> - Adds x86_64 specific wire up
> - Changes behaviour so process_vm_readv and process_vm_writev return
>   the number of bytes successfully read or written even if an error
>   occurs
> - Adds more kernel doc interface comments
> - rename of some internal functions (process_vm_rw_check_iovecs,
>   process_vm_rw) so they make more sense.
>
> Still need to do benchmarking to see if the optimisation for small
> copies using a local on-stack array in process_vm_rw_core is worth it.
[]

A bit late to the party.

get_user_pages_fast may be a nice win here, since the pages will
almost always be present; it'll backoff to the locked get_user_pages
path to handle the pathological case of swapped pages.

Thanks,
  Daniel
-- 
Daniel J Blueman
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