On Fri, Mar 15, 2019 at 9:27 AM Jens Axboe <axboe@xxxxxxxxx> wrote:
>
> Linus, curious on your opinion on this one. I had this as part of the
> original series, but removed it from the pull request due to the
> mincore etc discussions.
I'd rather not have new ways to leak cache information, and in fact
already the IOCB_NOWAIT is a bit questionable for that. But afaik, the
non-O_DIRECT paths don't even support it to begin with for some
filesystems.
Wasn't the whole point of this io_ring that we'd move *away* from
direct block access and O_DIRECT?
I'm seeing a lot of stuff that looks like just "more of the same old
O_DIRECT garbage" that seems to be all about thinking that IO doesn't
cache.
Haven't we gotten over that already? It was one of the arguments you
used for io_ring to begin with.
Linus
