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[PATCH 00/16] deps: deterministic driver initialization order

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  [PATCH 00/16] deps: deterministic driver initialization order Alexander Holler <holler@ahsoftware.de> - 2015-08-26 14:30 +0200
    [PATCH 01/16] deps: dtc: Automatically add new property 'dependencies' which contains a list of referenced phandles Alexander Holler <holler@ahsoftware.de> - 2015-08-26 14:30 +0200
    [PATCH 02/16] deps: dtc: Add option to print initialization order Alexander Holler <holler@ahsoftware.de> - 2015-08-26 14:30 +0200
    [PATCH 16/16] phy: phy-core: fix initcall level Alexander Holler <holler@ahsoftware.de> - 2015-08-26 14:40 +0200
    [PATCH 11/16] deps: WIP: generic: annotate some initcalls Alexander Holler <holler@ahsoftware.de> - 2015-08-26 14:40 +0200
    [PATCH 09/16] deps: dts: imx6q: make some remote-endpoints non-dependencies Alexander Holler <holler@ahsoftware.de> - 2015-08-26 14:40 +0200
    [PATCH 07/16] deps: add debug configuration options Alexander Holler <holler@ahsoftware.de> - 2015-08-26 14:40 +0200
    [PATCH 05/16] deps: introduce initcalls annotated with a struct device_driver Alexander Holler <holler@ahsoftware.de> - 2015-08-26 14:40 +0200
    [PATCH 04/16] deps: dtc: introduce new (virtual) property no-dependencies Alexander Holler <holler@ahsoftware.de> - 2015-08-26 14:40 +0200
    [PATCH 12/16] deps: WIP: imx: annotate some initcalls Alexander Holler <holler@ahsoftware.de> - 2015-08-26 14:40 +0200
    [PATCH 06/16] deps: deterministic driver initialization sequence based on dependencies from the DT Alexander Holler <holler@ahsoftware.de> - 2015-08-26 14:40 +0200
    [PATCH 08/16] deps: dts: kirkwood: dockstar: add dependency ehci -> usb power regulator Alexander Holler <holler@ahsoftware.de> - 2015-08-26 14:40 +0200
    [PATCH 13/16] deps: WIP: omap: annotate some initcalls Alexander Holler <holler@ahsoftware.de> - 2015-08-26 14:40 +0200
    [PATCH 03/16] deps: dtc: Add option to print dependency graph as dot (Graphviz) Alexander Holler <holler@ahsoftware.de> - 2015-08-26 14:40 +0200
    [PATCH 14/16] deps: WIP: kirkwood: annotate some initcalls Alexander Holler <holler@ahsoftware.de> - 2015-08-26 14:40 +0200
    [PATCH 10/16] deps: dts: omap: beagle: make some remote-endpoints non-dependencies Alexander Holler <holler@ahsoftware.de> - 2015-08-26 14:40 +0200
    [PATCH 15/16] mtd: mtdcore: fix initcall level Alexander Holler <holler@ahsoftware.de> - 2015-08-26 14:40 +0200
      Re: [PATCH 15/16] mtd: mtdcore: fix initcall level Brian Norris <computersforpeace@gmail.com> - 2015-09-01 23:20 +0200
        Re: [PATCH 15/16] mtd: mtdcore: fix initcall level Alexander Holler <holler@ahsoftware.de> - 2015-09-02 07:40 +0200
          Re: [PATCH 15/16] mtd: mtdcore: fix initcall level Alexander Holler <holler@ahsoftware.de> - 2015-09-04 06:10 +0200
    Re: [PATCH 00/16] deps: deterministic driver initialization order Alexander Holler <holler@ahsoftware.de> - 2015-08-27 21:10 +0200
      Re: [PATCH 00/16] deps: deterministic driver initialization order Alexander Holler <holler@ahsoftware.de> - 2015-08-27 21:20 +0200
    deps: update in regard to parallel initialization of static linked  drivers Alexander Holler <holler@ahsoftware.de> - 2015-09-04 11:20 +0200

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#1214788

Am 26.08.2015 um 14:28 schrieb Alexander Holler:

> The final 2 patches are fixes which should end up in mainline, regardless
> if this feature is merged or not.

Just in case your serial or MTD-NAND partitions don't work, the drivers
drivers/tty/serial/8250/8250_core.c and drivers/mtd/ofpart.c need the 
same trivial fix for their initcall level as found in the last two 
patches of my series. I'm not going to post these patches now until I've 
got some feedback for the other stuff.

Regards,

Alexander Holler
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#1214794

Am 27.08.2015 um 21:01 schrieb Alexander Holler:
> Am 26.08.2015 um 14:28 schrieb Alexander Holler:
>
>> The final 2 patches are fixes which should end up in mainline, regardless
>> if this feature is merged or not.
>
> Just in case your serial or MTD-NAND partitions don't work, the drivers
> drivers/tty/serial/8250/8250_core.c and drivers/mtd/ofpart.c need the
> same trivial fix for their initcall level as found in the last two
> patches of my series. I'm not going to post these patches now until I've
> got some feedback for the other stuff.

And just in case, I also have an idea how to fix such dependencies for 
drivers without DT (by adding hard-wired dependencies directly to 
drivers). That would also be usable for ACPI and x86.

But one step after another. Based on my past experiences, I don't even 
think the stuff I've just posted will ever end up in the kernel.

> Regards,
>
> Alexander Holler

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#1218788 — deps: update in regard to parallel initialization of static linked drivers

Am 26.08.2015 um 14:28 schrieb Alexander Holler:
> Hello,

(...)

> Some numbers (5 boots on each board, without and with ordering drivers),
> all times are seconds.

(...)

> imx6q (armv7):
>
> unordered:
> 3.451998 3.418864 3.446952 3.429974 3.440996 (3.4377568)
> ordered:
> 3.538312 3.549019 3.538105 3.515916 3.555715 (3.5394134)

(...)

> Further improvements could be to initialize drivers in parallel (using
> multiple cores) and/or to use this stuff on x86 (ACPI) too (e.g. by using a
> minimal DT which just includes dependencies).

I've now made a quick implementation which uses multiple threads to 
initialize annotated drivers in parallel. It worked out of the box.

Here are the times (dmesg | grep Freeing) I've now measured on the imx6q 
(4 cores):

3.388273 3.399892 3.411615 3.410523 3.388802 (3.399821)

So it's now at least as fast as without ordering the drivers. Even on 
the one system where ordering didn't help without parallel 
initialization (likely because the unordered sequence of initcalls is 
already quiet good on that system, in comparison to the other systems 
I've tested).

And my current implementation for the parallel stuff is far from being 
perfect and can be optimized much more (enough to not post a patch 
here). In addition I've added another driver to my config since I 
measure the old times, so the new times are including one more 
initialization of a driver (it now calls 30 annotated (static linked) 
drivers at boot, most stuff is still in modules (and some not annotated 
static linked drivers) on that system).

Maybe this helps raising interest enough that someone else will test and 
maybe give some (reasonable, not about style) feedback on my patches.

> Regards,
>
> Alexander Holler

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