linux-kernel - Re: [dm-devel] [PATCH v14 04/11] block: add emulation for copy

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Message-ID: <CAOSviJ13RJd4gTL2dzXrijXLaPUCB-pGG6x+_8ouW=7REO6e7g@mail.gmail.com>
Date:   Mon, 14 Aug 2023 22:28:18 +0530
From:   Nitesh Shetty <nitheshshetty@...il.com>
To:     Bart Van Assche <bvanassche@....org>
Cc:     Nitesh Shetty <nj.shetty@...sung.com>,
        Jens Axboe <axboe@...nel.dk>, Jonathan Corbet <corbet@....net>,
        Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...nel.org>, dm-devel@...hat.com,
        Keith Busch <kbusch@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        Vincent Fu <vincent.fu@...sung.com>,
        martin.petersen@...cle.com, linux-doc@...r.kernel.org,
        gost.dev@...sung.com, Anuj Gupta <anuj20.g@...sung.com>,
        linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-block@...r.kernel.org, mcgrof@...nel.org, dlemoal@...nel.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [dm-devel] [PATCH v14 04/11] block: add emulation for copy

On Sat, Aug 12, 2023 at 4:25 AM Bart Van Assche <bvanassche@....org> wrote:
>
> On 8/11/23 03:52, Nitesh Shetty wrote:
> > +     schedule_work(&emulation_io->emulation_work);
>
> schedule_work() uses system_wq. This won't work for all users since
> there are no latency guarantees for system_wq.
>
At present copy is treated as background operation, so went ahead
with the current approach.

Thank you,
Nitesh Shetty