Hi Jens, while working a little bit on cgroups I/O control, I found two nasty bugs in bfq. They break bandwidth control in simple configurations with one-process groups. These bugs are fixed by the first two patches in this series. These fixes improved I/O control so much, that I could reduce the write overcharge factor, used by bfq to counter write-induced issues. This reduction is performed by the third patch. The fourth patch contains a little code improvement I made in a function that has to do with I/O control. I hope we are still in time for 4.19. Thanks, Paolo Paolo Valente (4): block, bfq: readd missing reset of parent-entity service block, bfq: always update the budget of an entity when needed block, bfq: reduce write overcharge block, bfq: improve code of bfq_bfqq_charge_time block/bfq-iosched.c | 54 +++++++++++++++++++++++++++++++++++++++-------------- block/bfq-wf2q.c | 22 +++++++++++----------- 2 files changed, 51 insertions(+), 25 deletions(-) -- 2.16.1
