linux-kernel - Re: [PATCH BUGFIX IMPROVEMENT 0/7] boost throughput with synced I/O, reduce latency and fix a bandwidth bug

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Message-Id: <3FC8946F-AFB9-4BD8-A778-ECDB1464D9DC@linaro.org>
Date:   Tue, 25 Jun 2019 07:11:30 +0200
From:   Paolo Valente <paolo.valente@...aro.org>
To:     "Srivatsa S. Bhat" <srivatsa@...il.mit.edu>
Cc:     Jens Axboe <axboe@...nel.dk>,
        linux-block <linux-block@...r.kernel.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        bfq-iosched@...glegroups.com, oleksandr@...alenko.name,
        bottura.nicola95@...il.com
Subject: Re: [PATCH BUGFIX IMPROVEMENT 0/7] boost throughput with synced I/O,
 reduce latency and fix a bandwidth bug



> Il giorno 24 giu 2019, alle ore 22:15, Srivatsa S. Bhat <srivatsa@...il.mit.edu> ha scritto:
> 
> On 6/24/19 12:40 PM, Paolo Valente wrote:
>> Hi Jens,
>> this series, based against for-5.3/block, contains:
>> 1) The improvements to recover the throughput loss reported by
>>   Srivatsa [1] (first five patches)
>> 2) A preemption improvement to reduce I/O latency
>> 3) A fix of a subtle bug causing loss of control over I/O bandwidths
>> 
> 
> Thanks a lot for these patches, Paolo!
> 
> Would you mind adding:
> 
> Reported-by: Srivatsa S. Bhat (VMware) <srivatsa@...il.mit.edu>
> Tested-by: Srivatsa S. Bhat (VMware) <srivatsa@...il.mit.edu>
> 
> to the first 5 patches, as appropriate?
> 

With great pleasure!  (sorry for adding you only as tester in the
first place)

Thanks,
Paolo

> Thank you!
> 
>> 
>> [1] https://lkml.org/lkml/2019/5/17/755
>> 
>> Paolo Valente (7):
>>  block, bfq: reset inject limit when think-time state changes
>>  block, bfq: fix rq_in_driver check in bfq_update_inject_limit
>>  block, bfq: update base request service times when possible
>>  block, bfq: bring forward seek&think time update
>>  block, bfq: detect wakers and unconditionally inject their I/O
>>  block, bfq: preempt lower-weight or lower-priority queues
>>  block, bfq: re-schedule empty queues if they deserve I/O plugging
>> 
>> block/bfq-iosched.c | 952 ++++++++++++++++++++++++++++++--------------
>> block/bfq-iosched.h |  25 +-
>> 2 files changed, 686 insertions(+), 291 deletions(-)
>> 
> 
> Regards,
> Srivatsa
> VMware Photon OS