linux-kernel - Re: [PATCH v2] driver core: shut down devices asynchronously

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Message-ID: <9770fe32-2b0c-639e-481a-dd8686e5eb7d@gmail.com>
Date:   Sat, 16 Sep 2023 15:02:16 -0500
From:   stuart hayes <stuart.w.hayes@...il.com>
To:     linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Tanjore Suresh <tansuresh@...gle.com>,
        Martin Belanger <Martin.Belanger@...l.com>,
        Oliver O'Halloran <oohall@...il.com>,
        Daniel Wagner <dwagner@...e.de>,
        Keith Busch <kbusch@...nel.org>, Lukas Wunner <lukas@...ner.de>
Subject: Re: [PATCH v2] driver core: shut down devices asynchronously



On 9/13/2023 4:05 PM, Stuart Hayes wrote:
> Shut down devices asynchronously, ensuring that each device is shut down
> before its parents.
> 
> This can dramatically reduce system shutdown/reboot time on systems that
> have devices that take many seconds to shut down, such as some NVMe drives.
> On one system tested, the shutdown time went from 11 minutes without this
> patch to 55 seconds with the patch.
> 
> Signed-off-by: Stuart Hayes <stuart.w.hayes@...il.com>
> ---
> v1->v2: rewritten using kernel async code (suggested by Lukas Wunner)
> ---
> 
>   drivers/base/base.h   |   2 +
>   drivers/base/core.c   | 135 ++++++++++++++++++++++++------------------
>   include/linux/async.h |   6 ++
>   3 files changed, 87 insertions(+), 56 deletions(-)
> 

Please disregard this patch... I realized this could be done in a simpler way.  I'll send a V3 this week.