linux-kernel - Re: [PATCH v6 2/2] tcmu: Add global data block pool support

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Date:   Mon, 01 May 2017 22:26:24 -0700
From:   "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:     Mike Christie <mchristi@...hat.com>
Cc:     Xiubo Li <lixiubo@...s.chinamobile.com>, agrover@...hat.com,
        iliastsi@...ikto.com, namei.unix@...il.com, sheng@...ker.org,
        linux-scsi@...r.kernel.org, target-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Jianfei Hu <hujianfei@...s.chinamobile.com>
Subject: Re: [PATCH v6 2/2] tcmu: Add global data block pool support

On Mon, 2017-05-01 at 13:40 -0500, Mike Christie wrote:
> On 04/30/2017 06:29 AM, Xiubo Li wrote:
> > [...]

<SNIP>

> >> To avoid starvation, I think you want a second list/fifo that holds the
> >> watiers. In tcmu_get_empty_block if the list is not empty, record how
> >> many pages we needed and then add the device to the list and wait in
> >> tcmu_queue_cmd_ring.
> >>
> >> Above if we freed enough pages for the device at head then wake up the
> >> device.
> >>
> >> I think you also need a wake_up call in the completion path in case the
> >> initial call could not free enough pages. It could probably check if the
> >> completion was going to free enough pages for a waiter and then call
> >> wake.
> >>
> > Yes, I meant to introduce this later after this series to not let the
> > patches too
> > complex to review.
> > 
> > If you agree I will do this later, or in V7 series ?
> 
> 
> Yeah, I am ok with adding it after the initial patches go in.

Btw, adding your Acked-by for the initial merge of these.

If that's a problem, please make some noise.  ;)