linux-kernel - Re: [RFC PATCH 0/9] V4L2 Jobs API WIP

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Message-ID: <CAAFQd5BmeWzwcDcRwP6r7eTvK=JjdZC8X96WqwfUN0KqQeOOTw@mail.gmail.com>
Date:   Thu, 26 Oct 2017 11:49:36 +0900
From:   Tomasz Figa <tfiga@...omium.org>
To:     Sakari Ailus <sakari.ailus@....fi>
Cc:     Alexandre Courbot <acourbot@...omium.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Pawel Osciak <pawel@...iak.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Gustavo Padovan <gustavo.padovan@...labora.com>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 0/9] V4L2 Jobs API WIP

Hi Sakari,

On Thu, Oct 19, 2017 at 11:43 PM, Sakari Ailus <sakari.ailus@....fi> wrote:
> Hi Alexandre,
>
> On Thu, Sep 28, 2017 at 06:50:18PM +0900, Alexandre Courbot wrote:
>> Hi everyone,
>>
[snip]
>
> Still it shouldn't be forgotten that if the framework is geared towards
> helping drivers "running one job at a time" the scope will be limited to
> memory-to-memory devices; streaming devices, e.g. all kinds of cameras have
> multiple requests being processed simultaneously (or frames are bound to be
> lost, something we can't allow to happen due to framework design).

I'd be interested in some further explanation of these multiple
requests being processed simultaneously and why they couldn't be
included in a single job.

Best regards,
Tomasz