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Message-ID: <1322511490.2921.175.camel@twins>
Date: Mon, 28 Nov 2011 21:18:10 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Jiri Olsa <jolsa@...hat.com>, fweisbec@...il.com, mingo@...hat.com,
paulus@...ba.org, acme@...stprotocols.net,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/9] ftrace, perf: Add support to use function
tracepoint in perf
On Mon, 2011-11-28 at 15:16 -0500, Steven Rostedt wrote:
> On Mon, 2011-11-28 at 21:10 +0100, Peter Zijlstra wrote:
>
> > > Yeah, but still not something you want to do during context switches,
> > > right?
> >
> > Also, that's x86, there's still archs that need stop_machine(), right?
>
> s390 may need it, but till we add a work around there too.
>
> But yeah, if this happens at context switch, then we want the fast
> enable/disable that Jiri made.
Right, so the way tracepoint->perf works currently is we enable the
tracepoint when we create the event. The tracepoint handler runs a
per-cpu hlist. perf then registers with the per-cpu hlist on context
switch.
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