linux-kernel - Re: [PATCH 00/20] LightNVM: pblk patches for 4.13

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Date:   Tue, 27 Jun 2017 10:00:52 +0200
From:   Javier González <jg@...htnvm.io>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Matias Bjørling <mb@...htnvm.io>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/20] LightNVM: pblk patches for 4.13

> On 27 Jun 2017, at 00.29, Jens Axboe <axboe@...nel.dk> wrote:
> 
> On Mon, Jun 26 2017, Javier González wrote:
>> Hi Matias,
>> 
>> Here you have the pblk patchset for this window.
>> 
>> Apart from small fixes for LightNVM core and pblk, there are three
>> relevant changes:
>> 
>> - Metadata for each line is no longer issued on a separate workqueue,
>>   but instead, all I/Os are scheduled on the write thread. This allows
>>   to have more control over LUN collisions. The result is that we can
>>   use the full bandwidth of the device for user data. In the 4.12 pblk,
>>   we use ~25% of the bandwidth for metadata.
>> 
>> - The rate-limiter and GC have been tuned to keep the GC writer busy.
>>   Also, capacity per line is guaranteed for GC I/O as we reach
>>   capacity.
>> 
>> - We have now a FTL state machine. This allows to fail gracefully to
>>   user space in case of irrecoverable errors. This state machine will
>>   be the base for the pblk's FTL log.
>> 
>> The patches apply into your for-4.13/core. You can also find them in:
> 
> Nope, they do not. Patch #7 fails, because it's not on top of the
> bio_set changes that went in a week or two ago. I hand applied that one,
> didn't find issues with the rest.
> 
> But please remember to ensure that it applies on top of the current
> branch.

Thanks Jens. Won't happen again.

Javier


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