linux-kernel - Re: [PATCH 0/3] get_abi: improve message output and fix a regression

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Date:   Tue, 28 Sep 2021 15:43:53 +0200
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH 0/3] get_abi: improve message output and fix a
 regression

Em Tue, 28 Sep 2021 14:27:39 +0200
Mauro Carvalho Chehab <mchehab+huawei@...nel.org> escreveu:

> Em Tue, 28 Sep 2021 13:04:22 +0200
> Greg Kroah-Hartman <gregkh@...uxfoundation.org> escreveu:
> 
> > On Tue, Sep 28, 2021 at 12:14:01PM +0200, Mauro Carvalho Chehab wrote:  
> > > Hi Greg,
> > > 
> > > As promised on
> > > 
> > > 	https://lore.kernel.org/lkml/20210928120304.62319fba@coco.lan/T/#u
> > > 
> > > I'm adding progress info when  get_abi.pl is checking for undefined ABI symbols
> > > on patches 1 and 2.
> > > 
> > > That will help not only to identify what is causing delays on the script, but also
> > > to notify the user that processing it could take some time on some systems.
> > > 
> > > If you run it on your big server with:
> > > 
> > >   scripts/get_abi.pl undefined 2>logs
> > > 
> > > The "logs" file will contain timestamps relative to the time the script started to
> > > do the regex matches for sysfs files. It should be printing one line every
> > > time the progress completes 1% or one second after the last progress output.    
> > 
> > Adding more debugging and tweaking the script a bit to show the file it
> > is about to check, not the one it finished checking,  
> 
> Feel free to modify the script and add such debug/tweaks if you find
> it useful. 
> 
> > I got the following
> > debug output that seems to pinpoint the problem file.
> > 
> > The sysfs file that is causing problems is:
> > 	/sys/devices/pci0000:40/0000:40:00.2/iommu/ivhd1/amd-iommu/cap
> > 
> 
> Btw, I just got an arm64 server with 128 CPUs for testing. I'm trying
> to allocate also a big x86 server here, but I'm not sure if it is AMD or
> Intel.

Some tests on a Gigabyte R182-Z91-00 server, equipped with AMD EPYC 7352 
24-Core Processors (total 96 threads):

	$ find /sys |wc -l
	233981

	$ time ./scripts/get_abi.pl undefined >undefined 2>logs

	real	0m38.917s
	user	0m34.554s
	sys	0m4.292s

PS.: this machine doesn't have anything at /sys/class/iommu.

On a Huawei TaiShan 200 (Model 2280) with 128 ARM cores:

	$ find /sys |wc -l
	99362
	$ time ./scripts/get_abi.pl undefined >undefined 2>logs

	real	0m29.311s
	user	0m26.173s
	sys	0m3.061s

Both machines are using Perl 5.26.

Thanks,
Mauro