Re: Expense of read_iter

Matthew Wilcox
2021-01-21T16:59:57Z

On Wed, Jan 20, 2021 at 10:12:01AM -0500, Mikulas Patocka wrote:
> Do you have some idea how to optimize the generic code that calls
> ->read_iter?

Yes.

> It might be better to maintain an f_iocb_flags in the
> struct file and just copy that unconditionally. We'd need to remember
> to update it in fcntl(F_SETFL), but I think that's the only place.

Want to give that a try?