On Tue, 2020-03-03 at 09:19 -0500, Tejun Heo wrote: > Hello, > > On Tue, Mar 03, 2020 at 03:13:10PM +0100, Benjamin Berg wrote: > > so, I tried to set io.latency for some cgroups for the root device, > > which is ext4 inside LVM inside LUKS. > > It's pointless on compound devices. I think the right thing to do here > is disallowing to enable it on those devices. I believe systemd tries to resolve to /dev/sda but that seems to fail for me. So I think there is a bug in that code; I'll verify that and submit a fix if so. Which device should actually be selected? Is it /dev/sda or the mapper device that / is mounted from? Benjamin
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