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

From: Jens Axboe
Date: Mon Jun 26 2017 - 18:29:48 EST


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.

--
Jens Axboe