On Thu, May 06, 2021 at 09:08:50PM +0000, Al Viro wrote: > On Thu, May 06, 2021 at 01:15:01PM -0600, Jens Axboe wrote: > > > Attached output of perf annotate <func> for that last run. > > Heh... I wonder if keeping the value of iocb_flags(file) in > struct file itself would have a visible effect... I suggested that ... https://lore.kernel.org/linux-fsdevel/20210110061321.GC35215@xxxxxxxxxxxxxxxxxxxx/