Re: [PATCH v13 4/5] mm: support reporting free page blocks

[Michal Hocko]

On Fri 04-08-17 00:02:01, Michael S. Tsirkin wrote:
> On Thu, Aug 03, 2017 at 03:20:09PM +0000, Wang, Wei W wrote:
> > On Thursday, August 3, 2017 9:51 PM, Michal Hocko: 
> > > As I've said earlier. Start simple optimize incrementally with some numbers to
> > > justify a more subtle code.
> > > --
> > 
> > OK. Let's start with the simple implementation as you suggested.
> > 
> > Best,
> > Wei
> 
> The tricky part is when you need to drop the lock and
> then restart because the device is busy. Would it maybe
> make sense to rotate the list so that new head
> will consist of pages not yet sent to device?

No, I this should be strictly non-modifying API.
-- 
Michal Hocko
SUSE Labs