From: Andi Kleen <ak@suse.de>
To: eranian@hpl.hp.com
Cc: linux-kernel@vger.kernel.org, "S. P. Prasanna" <prasanna@in.ibm.com>
Subject: Re: [PATCH 10/18] 2.6.17.9 perfmon2 patch for review: PMU context switch support
Date: Fri, 25 Aug 2006 15:17:30 +0200 [thread overview]
Message-ID: <200608251517.30479.ak@suse.de> (raw)
In-Reply-To: <20060825125633.GE5330@frankl.hpl.hp.com>
On Friday 25 August 2006 14:56, Stephane Eranian wrote:
> On Fri, Aug 25, 2006 at 02:20:31PM +0200, Andi Kleen wrote:
> > On Friday 25 August 2006 13:56, Stephane Eranian wrote:
> >
> > > > I suppose some of those functions must be marked __kprobes
> > > >
> > > Are there any guidelines as to why some functions must be ignored
> > > by kprobes? I assume if meaans they cannot be instrumented.
> >
> > It does yes.
> >
> > In general anything that could cause kprobes to recurse is forbidden.
>
> In the case of the PMU context switch, are you saying that you may
> context switch as a consequence of hitting a (K)probe?
I hope not, but at least the current __switch_to is marked __kprobes
and I assume there was some reason for it and it will likely apply
to callees too. For details ask Prasanna (cc'ed).
-Andi
next prev parent reply other threads:[~2006-08-25 13:17 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-23 8:06 [PATCH 10/18] 2.6.17.9 perfmon2 patch for review: PMU context switch support Stephane Eranian
2006-08-23 10:29 ` Andi Kleen
2006-08-25 11:56 ` Stephane Eranian
2006-08-25 12:20 ` Andi Kleen
2006-08-25 12:56 ` Stephane Eranian
2006-08-25 13:17 ` Andi Kleen [this message]
2006-08-23 22:57 ` Andrew Morton
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