Re: [PATCH RESEND v3 00/13] blk-mq: Reduce static requests memory footprint for shared sbitmap

[John Garry]

On 13/09/2021 16:12, John Garry wrote:
> Currently a full set of static requests are allocated per hw queue per
> tagset when shared sbitmap is used.
>
> However, only tagset->queue_depth number of requests may be active at
> any given time. As such, only tagset->queue_depth number of static
> requests are required.
>
> The same goes for using an IO scheduler, which allocates a full set of
> static requests per hw queue per request queue.
>
> This series changes shared sbitmap support by using a shared tags per
> tagset and request queue. Ming suggested something along those lines in
> v1 review. But we'll keep name "shared sbitmap" name as it is familiar. In
> using a shared tags, the static rqs also become shared, reducing the
> number of sets of static rqs, reducing memory usage.

Hi Ming,

Could you kindly check the remaining few un-reviewed patches in this 
series when you get an opportunity?

Thanks,
John