On 08/31/2017 12:46 AM, Paolo Valente wrote: > [SECOND TAKE, with just the name of one of the tester fixed] > > Hi, > while testing the read-write unfairness issues reported by Mel, I > found BFQ failing to guarantee good responsiveness against heavy > random sync writes in the background, i.e., multiple writers doing > random writes and systematic fdatasync [1]. The failure was caused by > three related bugs, because of which BFQ failed to guarantee to > high-weight processes the expected fraction of the throughput. > > The three patches in this series fix these bugs. These fixes restore > the usual BFQ service guarantees (and thus optimal responsiveness > too), against the above background workload and, probably, against > other similar workloads. Applied for 4.14, thanks Paolo. -- Jens Axboe
