On Mon 08 Jun 2015 03:21:19 PM CEST, Stefan Hajnoczi <stefa...@redhat.com> wrote:
> Please structure the patches so that each statistic or group of > statistics has its own patch. Yes, that's the plan. >> uint64_t queue_depth[BLOCK_MAX_IOTYPE]; >> >> Average number of requests. Similar to the previous one. It would >> require us to keep a count of ongoing requests as well. > > How is this calculated? > > You can keep track of the maximum queue depth easily (I think that's > what fio does, for example). For anything else you need a concept of > time like a load average calculation. We already need a way to compute the average latency for I/O operations in a certain period of time, so we can use that. Benoît had already written some code for that purpose and that's what I'm using as the basis for my work. https://lists.nongnu.org/archive/html/qemu-devel/2014-09/msg04844.html Berto
