On Sun, Sep 09, 2018 at 10:03:35AM +0200, Klaus Kusche wrote: > > 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! This was probably 522a777566f5 ("block: consolidate struct request timestamp fields"). Not the proper fix, but can you try the following: diff --git a/block/blk-core.c b/block/blk-core.c index 4dbc93f43b38..663430090281 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -2738,7 +2738,7 @@ void blk_account_io_done(struct request *req, u64 now) struct hd_struct *part; int cpu; - duration = nsecs_to_jiffies(now - req->start_time_ns); + duration = max(nsecs_to_jiffies(now - req->start_time_ns), 1); cpu = part_stat_lock(); part = req->part;
