From: Peter Zijlstra <peterz@infradead.org>
To: Stephane Eranian <eranian@google.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
linux-kernel@vger.kernel.org, mingo@elte.hu, paulus@samba.org,
davem@davemloft.net, perfmon2-devel@lists.sf.net,
eranian@gmail.com, robert.richter@amd.com,
markus.t.metzger@intel.com
Subject: Re: [PATCH] perf_events: improve DS/BTS/PEBS buffer allocation
Date: Mon, 13 Sep 2010 17:16:40 +0200 [thread overview]
Message-ID: <1284391000.2275.338.camel@laptop> (raw)
In-Reply-To: <AANLkTi=OR69sDbUMkSnx_-bpF=yHF_xNY1v=-BJgLpp5@mail.gmail.com>
On Mon, 2010-09-13 at 17:13 +0200, Stephane Eranian wrote:
> > For now I think you can not do this. vmalloc'ed memory can't be safely
> > accessed from NMIs in x86 because that might fault. And faults from NMIs
> > are not supported. They cause very bad things: return from fault calls
> > iret which reenables NMI, so NMI can nest but in the meantime there is
> > only one NMI stack, so that gets quickly messed up.
> >
> What kind of faults are you talking about here? TLB faults?
Page faults. vmalloc pte setup is lazy.
next prev parent reply other threads:[~2010-09-13 15:17 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-13 14:55 [PATCH] perf_events: improve DS/BTS/PEBS buffer allocation Stephane Eranian
2010-09-13 15:08 ` Peter Zijlstra
2010-09-13 15:21 ` Stephane Eranian
2010-09-13 15:09 ` Frederic Weisbecker
2010-09-13 15:13 ` Stephane Eranian
2010-09-13 15:16 ` Peter Zijlstra [this message]
2010-09-13 15:20 ` Stephane Eranian
2010-09-13 15:24 ` Peter Zijlstra
2010-09-13 15:31 ` Stephane Eranian
2010-09-13 15:41 ` Peter Zijlstra
2010-09-13 15:51 ` Frederic Weisbecker
2010-09-13 15:55 ` Stephane Eranian
2010-09-13 17:35 ` Peter Zijlstra
2010-09-13 18:40 ` Stephane Eranian
2010-09-13 18:42 ` Peter Zijlstra
2010-09-13 18:49 ` Stephane Eranian
2010-09-13 18:57 ` Peter Zijlstra
2010-09-13 19:12 ` Stephane Eranian
2010-09-13 19:31 ` Mathieu Desnoyers
2010-09-13 19:34 ` Peter Zijlstra
2010-09-13 19:35 ` Peter Zijlstra
2010-09-13 19:42 ` Mathieu Desnoyers
2010-09-13 17:24 ` Stephane Eranian
2010-09-13 17:36 ` Peter Zijlstra
2010-09-13 19:35 ` Andi Kleen
2010-09-13 19:49 ` Peter Zijlstra
2010-09-13 20:51 ` Andi Kleen
2010-09-13 20:57 ` [perfmon2] " Luck, Tony
2010-09-13 20:34 ` H. Peter Anvin
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