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From: Keith Busch <kbusch@kernel.org>
To: Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagi@grimberg.me>,
	linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-nvme@lists.infradead.org,
	Akinobu Mita <akinobu.mita@gmail.com>, Jens Axboe <axboe@fb.com>,
	Chris Healy <Chris.Healy@zii.aero>,
	Guenter Roeck <linux@roeck-us.net>
Subject: Re: [PATCH] nvme: Add hardware monitoring support
Date: Mon, 28 Oct 2019 17:08:58 +0900	[thread overview]
Message-ID: <20191028080858.GB1718@redsun51.ssa.fujisawa.hgst.com> (raw)
In-Reply-To: <20191028073953.GA20443@lst.de>

On Mon, Oct 28, 2019 at 08:39:53AM +0100, Christoph Hellwig wrote:
> On Sun, Oct 27, 2019 at 07:41:56PM -0700, Guenter Roeck wrote:
> > nvme devices report temperature information in the controller information
> > (for limits) and in the smart log. Currently, the only means to retrieve
> > this information is the nvme command line interface, which requires
> > super-user privileges.
> > 
> > At the same time, it would be desirable to use NVME temperature information
> > for thermal control.
> > 
> > This patch adds support to read NVME temperatures from the kernel using the
> > hwmon API and adds temperature zones for NVME drives. The thermal subsystem
> > can use this information to set thermal policies, and userspace can access
> > it using libsensors and/or the "sensors" command.
> 
> So these reported values seem to generate some interest.  Adding Akinobu
> Mita who also planned to wire them up to the thermal framework.  I don't
> really know either upper layer so I'm not sure which is the right one,
> but with this just like with the previous series I am quite worried that
> we add a lot of kernel boilerplate code for information people can
> trivially get using nvme-cli.

I think it's nvme-cli requires root, where this conveniently doesn't
need those elevated rights.

I'm not familiar with either upper level framework either; my only review
comment for this patch is to use devm_kfree() for the error cases.

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  reply	other threads:[~2019-10-28  8:09 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-28  2:41 Guenter Roeck
2019-10-28  7:39 ` Christoph Hellwig
2019-10-28  8:08   ` Keith Busch [this message]
2019-10-28 13:27     ` Guenter Roeck
2019-10-28 18:01 ` Andrey Smirnov

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