linux-kernel - Re: [driver-core PATCH v6 9/9] libnvdimm: Schedule device registration on node local to the device

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Message-ID: <1543353746.185366.90.camel@acm.org>
Date:   Tue, 27 Nov 2018 13:22:26 -0800
From:   Bart Van Assche <bvanassche@....org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     alexander.h.duyck@...ux.intel.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Tejun Heo <tj@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux-pm mailing list <linux-pm@...r.kernel.org>,
        jiangshanlai@...il.com, "Rafael J. Wysocki" <rafael@...nel.org>,
        "Brown, Len" <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        zwisler@...nel.org, Dave Jiang <dave.jiang@...el.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: Re: [driver-core PATCH v6 9/9] libnvdimm: Schedule device
 registration on node local to the device

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.