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Re: [PATCH 04/14] init: deps: order network interfaces by link order

From Alexander Holler <holler@ahsoftware.de>
Newsgroups linux.kernel
Subject Re: [PATCH 04/14] init: deps: order network interfaces by link order
Date 2015-10-18 12:20 +0200
Message-ID <qkTeh-2al-1@gated-at.bofh.it> (permalink)
References (6 earlier) <qkFuF-77M-13@gated-at.bofh.it> <qkOeE-385-51@gated-at.bofh.it> <qkOxX-3L2-9@gated-at.bofh.it> <qkOHD-3YM-1@gated-at.bofh.it> <qkPaG-4yn-3@gated-at.bofh.it>
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Am 18.10.2015 um 07:59 schrieb Greg Kroah-Hartman:
> On Sun, Oct 18, 2015 at 07:20:34AM +0200, Alexander Holler wrote:
>> Am 18.10.2015 um 07:14 schrieb Greg Kroah-Hartman:
>>> On Sun, Oct 18, 2015 at 06:59:22AM +0200, Alexander Holler wrote:
>>>> Am 17.10.2015 um 21:36 schrieb Greg Kroah-Hartman:
>>>>
>>>>> Again, parallelizing does not solve anything, and causes more problems
>>>>> _and_ makes things take longer.  Try it, we have done it in the past and
>>>>> proven this, it's pretty easy to test :)
>>>>
>>>> Just because I'm curious, may I ask how I would test that in the easy way
>>>> you have in mind? I've just posted the results of my tests (the patch
>>>> series) but I wonder what you do have in mind.
>>>
>>> Use the tool, scripts/bootgraph.pl to create a boot graph of your boot
>>> sequence.  That should show you the drivers, or other areas, that are
>>> causing your boot to be "slow".
>>
>> So I've misunderstood you. I've read your paragraph as that it's easy to
>> test parallelizing.
>
> Ah, ok, if you want to parallelize everything, add some logic in the
> driver core where the probe() callback is made to spin that off into a
> new thread for every call, and when it's done, clean up the thread.
> That's what I did many years ago to try this all out, if you dig in the
> lkml archives there's probably a patch somewhere that you can base the
> work off of to test it yourself.

Hmm, I don't think I will do that because that means to setup a new 
thread for every call. And it doesn't need much imagination (or 
experience) that this introduces quite some overhead.

But maybe it makes sense to try out what I'm doing in my patches, 
starting multiple threads once and then just giving them some work. Will 
keep that in mind, also I don't think I will post any patch in the next 
few years. ;)

Regards,

Alexander Holler
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[PATCH 0/14] init: deps: dependency based (parallelized) init Alexander Holler <holler@ahsoftware.de> - 2015-10-17 19:20 +0200
  [PATCH 04/14] init: deps: order network interfaces by link order Alexander Holler <holler@ahsoftware.de> - 2015-10-17 19:20 +0200
    Re: [PATCH 04/14] init: deps: order network interfaces by link order Linus Torvalds <torvalds@linux-foundation.org> - 2015-10-17 20:30 +0200
      Re: [PATCH 04/14] init: deps: order network interfaces by link order Alexander Holler <holler@ahsoftware.de> - 2015-10-17 20:40 +0200
        Re: [PATCH 04/14] init: deps: order network interfaces by link order Linus Torvalds <torvalds@linux-foundation.org> - 2015-10-17 21:00 +0200
          Re: [PATCH 04/14] init: deps: order network interfaces by link order Linus Torvalds <torvalds@linux-foundation.org> - 2015-10-17 21:10 +0200
            Re: [PATCH 04/14] init: deps: order network interfaces by link order Alexander Holler <holler@ahsoftware.de> - 2015-10-17 21:20 +0200
              Re: [PATCH 04/14] init: deps: order network interfaces by link order Linus Torvalds <torvalds@linux-foundation.org> - 2015-10-17 21:40 +0200
              Re: [PATCH 04/14] init: deps: order network interfaces by link order Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-17 21:40 +0200
                Re: [PATCH 04/14] init: deps: order network interfaces by link order Alexander Holler <holler@ahsoftware.de> - 2015-10-17 22:00 +0200
                Re: [PATCH 04/14] init: deps: order network interfaces by link order Alexander Holler <holler@ahsoftware.de> - 2015-10-17 23:30 +0200
                Re: [PATCH 04/14] init: deps: order network interfaces by link order Alexander Holler <holler@ahsoftware.de> - 2015-10-18 07:00 +0200
                Re: [PATCH 04/14] init: deps: order network interfaces by link order Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 07:20 +0200
                Re: [PATCH 04/14] init: deps: order network interfaces by link order Alexander Holler <holler@ahsoftware.de> - 2015-10-18 07:30 +0200
                Re: [PATCH 04/14] init: deps: order network interfaces by link order Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 08:00 +0200
                Re: [PATCH 04/14] init: deps: order network interfaces by link order Alexander Holler <holler@ahsoftware.de> - 2015-10-18 12:20 +0200
                Re: [PATCH 04/14] init: deps: order network interfaces by link order Alexander Holler <holler@ahsoftware.de> - 2015-10-19 13:00 +0200
                Re: [PATCH 04/14] init: deps: order network interfaces by link order Alexander Holler <holler@ahsoftware.de> - 2015-10-19 13:40 +0200
                Re: [PATCH 04/14] init: deps: order network interfaces by link order Alexander Holler <holler@ahsoftware.de> - 2015-10-22 08:50 +0200
            Re: [PATCH 04/14] init: deps: order network interfaces by link order Alexander Holler <holler@ahsoftware.de> - 2015-10-17 23:40 +0200
          Re: [PATCH 04/14] init: deps: order network interfaces by link order Alexander Holler <holler@ahsoftware.de> - 2015-10-17 21:10 +0200
        Re: [PATCH 04/14] init: deps: order network interfaces by link order Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-17 21:00 +0200
        Re: [PATCH 04/14] init: deps: order network interfaces by link order Linus Torvalds <torvalds@linux-foundation.org> - 2015-10-17 21:10 +0200
          Re: [PATCH 04/14] init: deps: order network interfaces by link order Alexander Holler <holler@ahsoftware.de> - 2015-10-17 21:10 +0200
  [PATCH 03/14] init: deps: dt: use (HW-specific) dependencies provided by the DT too Alexander Holler <holler@ahsoftware.de> - 2015-10-17 19:20 +0200
    Re: [PATCH 03/14] init: deps: dt: use (HW-specific) dependencies  provided by the DT too Mark Brown <broonie@kernel.org> - 2015-10-19 14:40 +0200
      Re: [PATCH 03/14] init: deps: dt: use (HW-specific) dependencies  provided by the DT too Rob Herring <robh+dt@kernel.org> - 2015-10-19 18:30 +0200
        Re: [PATCH 03/14] init: deps: dt: use (HW-specific) dependencies  provided by the DT too Alexander Holler <holler@ahsoftware.de> - 2015-10-19 19:30 +0200
      Re: [PATCH 03/14] init: deps: dt: use (HW-specific) dependencies  provided by the DT too Alexander Holler <holler@ahsoftware.de> - 2015-10-19 19:20 +0200
  [PATCH 06/14] dtc: deps: Automatically add new property 'dependencies' which contains a list of referenced phandles Alexander Holler <holler@ahsoftware.de> - 2015-10-17 19:20 +0200
  [PATCH 07/14] dtc: deps: introduce new (virtual) property no-dependencies Alexander Holler <holler@ahsoftware.de> - 2015-10-17 19:20 +0200
  [PATCH 09/14] dtc: deps: Add option to print dependency graph as dot (Graphviz) Alexander Holler <holler@ahsoftware.de> - 2015-10-17 19:20 +0200
  [PATCH 02/14] init: deps: use annotated initcalls for a dependency based (optionally parallelized) init Alexander Holler <holler@ahsoftware.de> - 2015-10-17 19:20 +0200
  [PATCH 01/14] init: deps: introduce annotated initcalls Alexander Holler <holler@ahsoftware.de> - 2015-10-17 19:20 +0200
  [PATCH 14/14] dt: dts: deps: omap: beagle: make some remote-endpoints non-dependencies Alexander Holler <holler@ahsoftware.de> - 2015-10-17 19:30 +0200
  [PATCH 13/14] dt: dts: deps: imx6q: make some remote-endpoints non-dependencies Alexander Holler <holler@ahsoftware.de> - 2015-10-17 19:30 +0200
  [PATCH 12/14] dt: dts: deps: kirkwood: dockstar: add dependency ehci -> usb power regulator Alexander Holler <holler@ahsoftware.de> - 2015-10-17 19:30 +0200
  Re: [PATCH 0/14] init: deps: dependency based (parallelized) init Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-17 19:50 +0200
    Re: [PATCH 0/14] init: deps: dependency based (parallelized) init Alexander Holler <holler@ahsoftware.de> - 2015-10-17 20:30 +0200
      Re: [PATCH 0/14] init: deps: dependency based (parallelized) init Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-17 20:40 +0200
        Re: [PATCH 0/14] init: deps: dependency based (parallelized) init Alexander Holler <holler@ahsoftware.de> - 2015-10-17 21:50 +0200
          Re: [PATCH 0/14] init: deps: dependency based (parallelized) init Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-17 22:30 +0200
            Re: [PATCH 0/14] init: deps: dependency based (parallelized) init Alexander Holler <holler@ahsoftware.de> - 2015-10-17 22:40 +0200
  Re: [PATCH 11/14] init: deps: annotate various initcalls Linus Torvalds <torvalds@linux-foundation.org> - 2015-10-17 20:50 +0200
    Re: [PATCH 11/14] init: deps: annotate various initcalls Alexander Holler <holler@ahsoftware.de> - 2015-10-17 21:10 +0200

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