On Mon, Nov 23, 2015 at 12:05:53PM +0100, Lutz Vieweg wrote: > Hi, > > in June 2015 the article https://lwn.net/Articles/648292/ mentioned > upcoming support for limiting the quantity of buffered writes > using control groups. > > Back then, only ext4 was said to support that feature, with other > filesystems requiring some minor changes to do the same. Yes, changing the kernel code to support this functionality is about 3 lines of code. however.... > The generic cgroup writeback support made it into mainline > linux-4.2, I tried to find information on whether other filesystems > had meanwhile been adapted, but couldn't find this piece of information. > > Therefore I'd like to ask: Does XFS (as of linux-4.3 or linux-4.4) > support limiting the quantity of buffered writes using control groups? .... I haven't added support to XFS because I have no way of verifying the functionality works and that it continues to work as it is intended. i.e. we have no regression test coverage for cgroup aware writeback and until someone writes a set of regression tests that validate it's functionality works correctly it will remain this way. Writing code is trivial. Validating the code actually works as intended and doesn't silently get broken in the future is the hard part.... Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
