linux-kernel - Re: [PATCH 2/2] powerpc: tracing: don't trace hcalls on offline CPUs

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Date:	Thu, 26 Nov 2015 20:26:40 +1100
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Denis Kirjanov <kda@...ux-powerpc.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] powerpc: tracing: don't trace hcalls on offline CPUs

On Thu, 2015-11-26 at 11:15 +0300, Denis Kirjanov wrote:
> On 11/26/15, Michael Ellerman <mpe@...erman.id.au> wrote:
> > On Tue, 2015-11-24 at 21:23 +0300, Denis Kirjanov wrote:
> > I can't get this to hit.
> > 
> > I've got LOCKDEP=y, I've enabled the hcall tracepoints, and then I offline
> > a cpu via sysfs.

> I haven't tried it via sysfs. Could you share the command
> so I give a try to reproduce.

Either manually:

$ echo 0 > /sys/devices/system/cpuN/online

Or using:

$ ppc64_cpu --cores-on=1
and/or
$ ppc64_cpu --smt=1

Which uses sysfs.

cheers

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