On Sat, Aug 29, 2020 at 10:51:11AM -0600, Jens Axboe wrote: > We currently increment the task/vm counts when we first attempt to queue a > bio. But this isn't necessarily correct - if the request allocation fails > with -EAGAIN, for example, and the caller retries, then we'll over-account > by as many retries as are done. > > This can happen for polled IO, where we cannot wait for requests. Hence > retries can get aggressive, if we're running out of requests. If this > happens, then watching the IO rates in vmstat are incorrect as they count > every issue attempt as successful and hence the stats are inflated by > quite a lot potentially. > > Add a bio flag to know if we've done accounting or not. This prevents > the same bio from being accounted potentially many times, when retried. Can't the resubmitter just use submit_bio_noacct? What is the call stack here?
