On Mon, Mar 27, 2017 at 12:15:29PM -0600, Jens Axboe wrote:

On 03/27/2017 11:51 AM, Shaohua Li wrote:

quoted

V6->V7:
- Don't overload blk stat, which will simplify the code. This will add extra
  space in bio/request though with the low interface configure option on.

Hmm, why? As far as I can see, it just makes things worse.

Part of the reason is the new callback based blk stat makes enabling stat less
straightforward. I probably can create a fake callback and enalbing the stat
though. Only the last 3 patches depend on this, if you prefer, I can resend
them and add the overload back.

Thanks,
Shaohua