Re: [PATCH 01/29] iov_iter: Switch to using a table of operations

[Christoph Hellwig]

On Sat, Nov 21, 2020 at 02:13:30PM +0000, David Howells wrote:
> Switch to using a table of operations.  In a future patch the individual
> methods will be split up by type.  For the moment, however, the ops tables
> just jump directly to the old functions - which are now static.  Inline
> wrappers are provided to jump through the hooks.
> 
> Signed-off-by: David Howells <dhowells@xxxxxxxxxx>

Please run performance tests.  I think the indirect calls could totally
wreck things like high performance direct I/O, especially using io_uring
on x86.