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Date:	Mon, 16 Jan 2023 14:08:21 +0100
To:	cygwin AT cygwin DOT com
Subject:	Re: vmstat yields error 'Unable to create system stat structure' on
	W11x64
Message-ID:	<Y8VMRejAHv8BgwDB@calimero.vinschen.de>
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From:	Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
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Cc:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>,
	Achim Gratz <Stromeko AT nexgo DOT de>
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On Jan 16 11:19, Corinna Vinschen via Cygwin wrote:
> On Jan 15 22:04, System Administrator via Cygwin wrote:
> > Hello,
> > 
> > I am trying to migrate my framework to Windows 11 running Cygwin.
> > When executing vmstat it returns the following error:
> > 
> > "Unable to create system stat structureā€¯
> > [...]
> I don't think this has anything to do with Windows10 or 11, but with the
> version of procps-ng you're running.
> 
> I tried vmstat from procps-ng-4.0.2-1 on both, W10 and W11, and I got
> the above error in both cases.
> 
> I switched back to procps-ng-3.3.17-1 and vmstat worked fine on both,
> W10 and W11.
> 
> I ran vmstat from procps-ng-4.0.2-1 under GDB and found that this
> vmstat tries to dynamically load libnuma.so or libnuma.1.so, both
> of which are naturally not available on Cygwin.  So I guess vmstat
> from procps-ng-4.x still needs another patch.

While that's obviously wrong, it's not the problem.  It turns out that
vmstat from procps-ng 4.0.2 stumbles over the fact, that /proc/cpuinfo
only prints the following fields if the CPU is a multi core CPU:

  "physical id"
  "siblings",
  "core id"
  "cpu cores"
  "apicid"
  "initial apicid"

On Linux the output of those fields only depends on the configuration
of the kernel.  If it has been built with CONFIG_SMP, these fields are
part of the /proc/cpuinfo output.

On Cygwin, the output of these fields actually depends on the fact if
the HTT CPU flag is set or not.  If not, it's not a multi core CPU and
the aforementioned fields are omitted.

I could reproduce this issue by changing the CPU topology in my QEMU/KVM
Windows 10 machine.  The default topology was 4 CPUs with 1 core and 1
thread each.  I changed that to 2 CPUs with 2 cores and 1 thread each.
After restarting the W10 machine, vmstat from procps-ng 4.0.2 started
working as desired.

So we can fix this issue by tweaking Cygwin instead.  I guess this will
be fodder for the upcoming 3.4.4 release.

I'll also provide a test release in a bit, stay tuned.

Achim, I still wonder if vmstat shouldn't also work on Linux if the
kernel hasn't been built with CONFIG_SMP.  Does the vmstat code fail
to take that into account?


Corinna

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