On Thu, 8 Nov 2018, Christoph Hellwig wrote: > On Tue, Nov 06, 2018 at 10:35:03PM +0100, Mikulas Patocka wrote: > > Device mapper was converted to percpu inflight counters. In order to > > display the correct values in the "inflight" sysfs file, we need a custom > > callback that sums the percpu counters. > > The attribute that calls this is per-partition, while your method > is per-queue, so there is some impedence mismatch here. Device mapper doesn't use partitions. > Is there any way you could look into just making the generic code > use percpu counters? In the next merge window, single-queue request-based block drivers will be eliminated - all the drivers will be multiqueue. So, they won't use the in_flight variables at all. in_flight will be only use by bio-based stacking drivers like md. > Also please cc linux-block on patches that touch the generic block > code. Mikulas -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
