Re: [PATCH 02/11] mm: call import_iovec() instead of rw_copy_check_uvector() in process_vm_rw()

Christoph Hellwig
2020-09-21T16:12:33Z

On Mon, Sep 21, 2020 at 04:29:37PM +0100, Al Viro wrote:
> On Mon, Sep 21, 2020 at 03:21:35PM +0000, David Laight wrote:
>
> > You really don't want to be looping through the array twice.
>
> Profiles, please.

Given that the iov array should be cache hot I'd be surprised to
see a huge difference.