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
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