On Fri, Oct 01, 2021 at 01:06:45PM +0200, Odin Hultgren van der Horst wrote: > Posted to both cgroups and linux-block > > Hi i read though some of the source code for cgroups, and from my understanding > the io cgroup subsystem does not support threaded cgroups. So i had some questions > regarding this. > > - Is there any future plans for supporting threaded? Not at the moment. > - What are the main hurdles in adding threaded support to the io cgroup subsystem? The biggest is the fact that page cache pagse are owned by processes not threads. A related issue is that writeback tracks ownership per inode with a mechanism for transferring ownership when majority writer changes. Splitting IO control per-thread would increase friction there. So, the summary is that the kernel doesn't track related resource consumptions at thread granularity. Thanks. -- tejun
