linux-kernel - Re: [PATCH v4 0/3] nvme power saving

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Message-ID: <20160922221613.GC14301@keith>
Date:   Thu, 22 Sep 2016 18:16:14 -0400
From:   Keith Busch <keith.busch@...el.com>
To:     J Freyensee <james_p_freyensee@...ux.intel.com>
Cc:     Jens Axboe <axboe@...com>, Andy Lutomirski <luto@...capital.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-nvme@...ts.infradead.org, Andy Lutomirski <luto@...nel.org>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v4 0/3] nvme power saving

On Thu, Sep 22, 2016 at 02:33:36PM -0700, J Freyensee wrote:
> ...and some SSDs don't even support this feature yet, so the number of
> different NVMe devices available to test initially will most likely be
> small (like the Fultondales I have, all I could check is to see if the
> code broke anything if the device did not have this power-save
> feature).
> 
> I agree with Jens, makes a lot of sense to start with this feature
> 'off'.
> 
> To 'advertise' the feature, maybe make the feature a new selection in
> Kconfig?  Example, initially make it "EXPERIMENTAL", and later when
> more devices implement this feature it can be integrated more tightly
> into the NVMe solution and default to on.

Should we just leave the kernel out of this then? I bet we could script
this feature in user space.