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SubjectRe: [PATCH BUGFIX/IMPROVEMENT 0/3] three bfq fixes restoring service guarantees with random sync writes in bg
> Tested-by: Oleksander Natalenko <oleksandr@natalenko.name>

I'm "Oleksandr" :).

31.08.2017 08:10, Paolo Valente wrote:
> 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.
>
> Thanks,
> Paolo
>
> [1] https://lkml.org/lkml/2017/8/9/957
>
> Paolo Valente (3):
> block, bfq: make lookup_next_entity push up vtime on expirations
> block, bfq: remove direct switch to an entity in higher class
> block, bfq: guarantee update_next_in_service always returns an
> eligible entity
>
> block/bfq-iosched.c | 4 +--
> block/bfq-iosched.h | 4 +--
> block/bfq-wf2q.c | 91
> ++++++++++++++++++++++++++++++++---------------------
> 3 files changed, 60 insertions(+), 39 deletions(-)
>
> --
> 2.10.0

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