On Thu, Feb 09, 2017 at 04:06:00PM +0000, Wols Lists wrote:

On 08/02/17 05:34, Shaohua Li wrote:

quoted

so it's the implementation which doesn't flush disk cache before writting new
data to disks, right? That makes sense then. I think we should fix this soon.
Don't think people will (or remember to) disable write-back cache before using
ppl.

Dunno whether I'm making a fool of myself :-) but might a quick-n-dirty
workaround be to make enabling PPL also disable write-back cache? With
maybe a warning not to switch it back on?

We don't have API for this in kernel side. This doesn't mean we can't add it
but since the limitation is in the implementation, we'd better fix the
implementation.

Thanks,
Shaohua