linux-kernel - RE: [PATCH v6 1/2] rcu: Add RCU stall diagnosis information

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Message-ID: <MW5PR84MB184289B1E4475337A075ED3AAB3E9@MW5PR84MB1842.NAMPRD84.PROD.OUTLOOK.COM>
Date:   Wed, 9 Nov 2022 17:03:50 +0000
From:   "Elliott, Robert (Servers)" <elliott@....com>
To:     Zhen Lei <thunder.leizhen@...wei.com>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        "Neeraj Upadhyay" <quic_neeraju@...cinc.com>,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        "rcu@...r.kernel.org" <rcu@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v6 1/2] rcu: Add RCU stall diagnosis information



> -----Original Message-----
> From: Elliott, Robert (Servers)
> Sent: Wednesday, November 9, 2022 10:56 AM
> > b/Documentation/admin-guide/kernel-parameters.txt
> > index a465d5242774af8..2729f3ad11d108b 100644
> > --- a/Documentation/admin-guide/kernel-parameters.txt
> > +++ b/Documentation/admin-guide/kernel-parameters.txt
> > @@ -5082,6 +5082,12 @@
> >  			rcupdate.rcu_cpu_stall_timeout to be used (after
> >  			conversion from seconds to milliseconds).
> >
> > +	rcupdate.rcu_cpu_stall_cputime= [KNL]
> > +			Provide statistics on the cputime and count of
> > +			interrupts and tasks during the sampling period. For
> > +			multiple continuous RCU stalls, all sampling periods
> > +			begin at half of the first RCU stall timeout.
> 
> This description should start with:
>     "In kernels built with CONFIG_RCU_CPU_STALL_TIME=y, "

Please ignore that comment - the module parameter is always
present (only subject to CONFIG_RCU_STALL_COMMON like the others).
The config option is just selecting the default value for
that module parameter.