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Date: Tue, 6 Aug 2019 22:08:37 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: "Lavrentiev, Anton (NIH/NLM/NCBI) [C]" <lavr AT ncbi DOT nlm DOT nih DOT gov>
Cc: cygwin AT cygwin DOT com
Subject: Re: getpriority() and top display for priority is inconsistent
Message-ID: <20190806200837.GW11632@calimero.vinschen.de>
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Mail-Followup-To: "Lavrentiev, Anton (NIH/NLM/NCBI) [C]" <lavr AT ncbi DOT nlm DOT nih DOT gov>,	cygwin AT cygwin DOT com
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On Aug  6 18:54, Lavrentiev, Anton (NIH/NLM/NCBI) [C] via cygwin wrote:
> I have noticed a discrepancy between the process priority shown by
> "top" vs. what getpriority() returns.
>=20
> I'm using the procps-based "top", so it reads the priority value from
> /proc/PID/stat.  The value gets there via code found in
> "fhandler_process.cc":
>=20
>   /* The BasePriority returned to a 32 bit process under WOW64 is
>   apparently broken, for 32 and 64 bit target processes.  64 bit
>   processes get the correct base priority, even for 32 bit processes.
>   */ if (wincap.is_wow64 ()) priority =3D 8; /* Default value. */ else
>   priority =3D pbi.BasePriority;
>=20
> But that's an inconsistent way of generating the value, because it is
> supposed to be the one that "getpriority()" returns.
>=20
> Also, it looks like the higher value in "pbi.BasePriority" corresponds
> to a higher process priority, while Unix priority is higher when the
> value is less (20 - nice, generally).
>=20
> It looks like it should have been done by calling a utility function,
> winprio_to_nice(GetPriorityClass(CurrentProcess())), and setting up
> both the priority field (as "NZERO + winprio_to_nice()") and the
> following "nice" field (which is currently set to permanent zero) with
> what winprio_to_nice() returns.

You seem to have worked it out already so please send a patch in
git format-patch foramt to the cygwin-patches mailing list.


Thanks,
Corinna

--=20
Corinna Vinschen
Cygwin Maintainer

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