Hello, Which subsystem could be responsible for https://bugzilla.kernel.org/show_bug.cgi?id=200857 ("4.18 regression: /proc/diskstats: I/O busy time not updated correctly")? This is for AHCI SATA disks (/dev/sda, /dev/sdb, ...), and the busy time reported by /proc/diskstats for SSD's is still (4.18.6) to low by at least a factor of 20 (!). Many thanks in advance for your help! -- Prof. Dr. Klaus Kusche Private address: Rosenberg 41, 07546 Gera, Germany +49 365 20413058 klaus.kusche@xxxxxxxxxxxxxxx https://www.computerix.info Office address: DHGE Gera, Weg der Freundschaft 4, 07546 Gera, Germany +49 365 4341 306 klaus.kusche@xxxxxxx https://www.dhge.de