linux-kernel - Re: [PATCH] powerpc: tracing: don't trace hcalls on offline CPUs

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Message-ID: <1448235359.18775.1.camel@ellerman.id.au>
Date:	Mon, 23 Nov 2015 10:35:59 +1100
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Denis Kirjanov <kda@...ux-powerpc.org>
Cc:	linuxppc-dev@...abs.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Anton Blanchard <anton@...ba.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc: tracing: don't trace hcalls on offline CPUs

On Fri, 2015-11-20 at 15:22 +0300, Denis Kirjanov wrote:
> On 11/3/15, Denis Kirjanov <kda@...ux-powerpc.org> wrote:
> > On 11/3/15, Michael Ellerman <mpe@...erman.id.au> wrote:
> > > On Thu, 2015-10-29 at 22:10 +0300, Denis Kirjanov wrote:
> > > > ./drmgr -c cpu -a -r gives the following warning:
> > > > 
> > > > [ 2327.035563] RCU used illegally from offline CPU!
> > > > 
> > > > Make the hypervisor tracepoints conditional by introducing
> > > > TRACE_EVENT_FN_COND similar to TRACE_EVENT_FN
> > > 
> > > We've fixed other cases like this with RCU_NONIDLE(), but I assume that
> > > doesn't work here because we're actually offline?
> > 
> > Yes, in this case we're moving the complete core offline through dlpar...
> > 
> 
> Hi Michael,
> Could you pick this patch?

It's mostly a tracing patch, so I'd need an ACK from Steve at least.

It would probably be best if you split it into a "tracing: .. " patch which
adds the new macros and then a powerpc patch which uses them.

cheers

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