Hi Chris, On Wed 24-01-18 17:02:47, Chris Mason wrote: > I'm really looking forward to LSF/MM this year. I can bring along a fair > amount of data from production about benchmarking and stability. > > We've been expanding our btrfs rollout, and we're also fixing up priority > inversions when cgroup IO controllers are put in place. I think we have > btrfs fixed up, but ext4 seems to be incompatible with IO controllers due to > data=ordered IO. Yeah, I suspect I know what you hit but still I'd be interested in hearing more details about your usecase and the problems you see. Maybe it could be helped. > We haven't tried XFS with the controllers yet but I don't think there > will be any major blockers there. > > I'm also hoping filesystem slab shrinking gets into the agenda, since we > have a few ugly hacks there to keep production happy. I'm interested in this as well but I suspect we need someone willing to spend a long time with slab reclaim guts to improve this. And so far nobody was bothered enough... Honza -- Jan Kara <jack@xxxxxxxx> SUSE Labs, CR
