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

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Message-ID: <e5f92ab5-eddd-eaed-3b3c-29b5bc60f0e6@huawei.com>
Date:   Mon, 20 Sep 2021 08:45:04 +0100
From:   John Garry <john.garry@...wei.com>
To:     <axboe@...nel.dk>, <ming.lei@...hat.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-block@...r.kernel.org>,
        <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH RESEND v3 00/13] blk-mq: Reduce static requests memory
 footprint for shared sbitmap

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