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Re: [PATCH 0/14] init: deps: dependency based (parallelized) init

From Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Newsgroups linux.kernel
Subject Re: [PATCH 0/14] init: deps: dependency based (parallelized) init
Date 2015-10-17 22:30 +0200
Message-ID <qkGh4-8he-7@gated-at.bofh.it> (permalink)
References <qkDjb-41n-7@gated-at.bofh.it> <qkDMd-4zb-7@gated-at.bofh.it> <qkEoW-5xv-23@gated-at.bofh.it> <qkEyC-5JJ-21@gated-at.bofh.it> <qkFEm-7j6-9@gated-at.bofh.it>
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On Sat, Oct 17, 2015 at 09:43:17PM +0200, Alexander Holler wrote:
> Am 17.10.2015 um 20:38 schrieb Greg Kroah-Hartman:
> 
> >So how long does that really take to call all probe functions in all
> >possible order?  Real numbers please.  We have the tools to determine
> >where at boot time delays are happening, please use them to find the
> >problem drivers.
> 
> No idea. You might ask Tomeu Vizoso (I've added him to cc) for details (or
> search for the thread "On-demand device registration" where he complained
> that his chromebook boots slow). I've just measured, that most my ARM boxes
> booted faster when I've used the ordering, instead of slower through the
> introduce overhead to order initcalls (without having parallelized the
> initcalls).

I've already asked him, I don't like his patch series to try to resolve
this issue either :)

> Posting times doesn't make much sense, as they heavily depend on the
> configuration. Instead I've posted patches so you can test it yourself.
> 
> But if you want a real time, my Netbook with a single core but HT Atom N270
> boots in one second instead of two to "dmesg | grep Freeing".

Try running the boot time graphic tool to determine where that time is
spent, odds are you just need to enable a single driver to async it's
probe function and you should be fine.

Again, fix up the broken driver(s), don't paper over the issues with
core changes that are not necessary.

thanks,

greg k-h
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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> - 2015-10-17 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
  [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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