Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring service guarantees with random sync writes in bg

From	Mel Gorman <mgorman@techsingularity.net>
Newsgroups	linux.kernel
Subject	Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring service guarantees with random sync writes in bg
Date	2017-09-04 10:20 +0200
Message-ID	<ulULU-35P-11@gated-at.bofh.it> (permalink)
References	<ukrsB-2c1-1@gated-at.bofh.it> <ukyX8-6Qc-19@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thu, Aug 31, 2017 at 03:42:57PM +0100, Mel Gorman wrote:
> On Thu, Aug 31, 2017 at 08:46:28AM +0200, 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.
> > 
> 
> Queued on top of Ming's most recent series even though that's still a work
> in progress. I should know in a few days how things stand.
> 

The problems with parallel heavy writers seem to have disappeared with this
series. There are still revisions taking place on Ming's to overall setting
of legacy vs mq is still a work in progress but this series looks good.

Thanks.

-- 
Mel Gorman
SUSE Labs

Thread

[PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring service guarantees with random sync writes in bg Paolo Valente <paolo.valente@linaro.org> - 2017-08-31 08:50 +0200
  [PATCH BUGFIX/IMPROVEMENT V2 1/3] block, bfq: make lookup_next_entity push up vtime on expirations Paolo Valente <paolo.valente@linaro.org> - 2017-08-31 08:50 +0200
  [PATCH BUGFIX/IMPROVEMENT V2 3/3] block, bfq: guarantee update_next_in_service always returns an eligible entity Paolo Valente <paolo.valente@linaro.org> - 2017-08-31 08:50 +0200
  [PATCH BUGFIX/IMPROVEMENT V2 2/3] block, bfq: remove direct switch to an entity in higher class Paolo Valente <paolo.valente@linaro.org> - 2017-08-31 08:50 +0200
  Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring  service guarantees with random sync writes in bg Jens Axboe <axboe@kernel.dk> - 2017-08-31 16:30 +0200
  Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring  service guarantees with random sync writes in bg Mel Gorman <mgorman@techsingularity.net> - 2017-08-31 16:50 +0200
    Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring  service guarantees with random sync writes in bg Mike Galbraith <efault@gmx.de> - 2017-08-31 19:10 +0200
      Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring service guarantees with random sync writes in bg Paolo Valente <paolo.valente@linaro.org> - 2017-08-31 19:20 +0200
        Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring  service guarantees with random sync writes in bg Mike Galbraith <efault@gmx.de> - 2017-08-31 19:40 +0200
    Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring  service guarantees with random sync writes in bg Mel Gorman <mgorman@techsingularity.net> - 2017-09-04 10:20 +0200
      Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring service guarantees with random sync writes in bg Paolo Valente <paolo.valente@linaro.org> - 2017-09-04 11:00 +0200
      Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring  service guarantees with random sync writes in bg Ming Lei <tom.leiming@gmail.com> - 2017-09-04 11:10 +0200

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