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Date:   Tue, 21 May 2019 16:50:47 +0200
From:   Maxime Ripard <maxime.ripard@bootlin.com>
To:     Rob Herring <robh@kernel.org>
Cc:     devicetree@vger.kernel.org,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] dt-bindings: Convert vendor prefixes to json-schema
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On Mon, May 20, 2019 at 04:23:20PM -0500, Rob Herring wrote:
> On Mon, May 20, 2019 at 11:35 AM Rob Herring <robh@kernel.org> wrote:
> >
> > On Mon, May 20, 2019 at 8:18 AM Maxime Ripard <maxime.ripard@bootlin.com> wrote:
> > >
> > > Hi Rob,
> > >
> > > On Fri, May 10, 2019 at 02:40:18PM -0500, Rob Herring wrote:
> > > > Convert the vendor prefix registry to a schema. This will enable checking
> > > > that new vendor prefixes are added (in addition to the less than perfect
> > > > checkpatch.pl check) and will also check against adding other prefixes
> > > > which are not vendors.
> > > >
> > > > Converted vendor-prefixes.txt using the following sed script:
> > > >
> > > > sed -e 's/\([a-zA-Z0-9\-]*\)[[:space:]]*\([a-zA-Z0-9].*\)/  "^\1,\.\*\":\n    description: \2/'
> > > >
> > > > Signed-off-by: Rob Herring <robh@kernel.org>
> > > > ---
> > > > As vendor prefix updates come in via multiple trees, I plan to merge
> > > > this before -rc1 to avoid cross tree conflicts.
> > >
> > > I just tried this with the 5.2-rc1 release, and this very
> > > significantly slows down the validation.
> > >
> > > With a dtbs_check run on (arm's) sunxi_defconfig, on my core-i5 with 4
> > > threads, I go from 1.30 minutes to more than 12.
> >
> > Indeed. 6 min to 45 min for allmodconfig. However, it's only 5 min to
> > run checks with only this file. I'd expect a more linear hit. Maybe
> > we're exceeding some cache size and thrashing.
>
> Looks like the problem is a cache. The python regex cache. Changing
> re._MAXCACHE from 512 to 4096 fixes the problem. I can set this in the
> dtschema lib.

Awesome, thanks!
Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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