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Message-ID: <1543353746.185366.90.camel@acm.org>
Subject: Re: [driver-core PATCH v6 9/9] libnvdimm: Schedule device
 registration on node local to the device
From: Bart Van Assche <bvanassche@acm.org>
Date: Tue, 27 Nov 2018 13:22:26 -0800
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To: Dan Williams <dan.j.williams@intel.com>
Cc: "Brown, Len" <len.brown@intel.com>, linux-nvdimm <linux-nvdimm@lists.01.org>, Greg KH <gregkh@linuxfoundation.org>, Linux-pm mailing list <linux-pm@vger.kernel.org>, jiangshanlai@gmail.com, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Pavel Machek <pavel@ucw.cz>, zwisler@kernel.org, Tejun Heo <tj@kernel.org>, alexander.h.duyck@linux.intel.com, Andrew Morton <akpm@linux-foundation.org>, "Rafael J. Wysocki" <rafael@kernel.org>
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On Tue, 2018-11-27 at 12:50 -0800, Dan Williams wrote:
> Thanks Bart, so tying this back to Alex's patches, does the ordering
> problem that Alex's patches solve impact the SCSI case? I'm looking
> for something like "SCSI depends on asynchronous probing and without
> 'driver core: Establish clear order of operations for deferred probe
> and remove' probing is often needlessly serialized". I.e. does it
> suffer from the same platform problem that libnvdimm ran into where
> it's local async probing implementation was hindered by the driver
> core?

(+Martin)

Hi Dan,

Patch 6/9 reduces the time needed to scan SCSI LUNs significantly. The only
way to realize that speedup is by enabling more concurrency. That's why I
think that patch 6/9 is a significant driver core improvement.

Bart.
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