From: Christoph Hellwig <hch@infradead.org>
To: Avi Kivity <avi@qumranet.com>
Cc: Christoph Hellwig <hch@infradead.org>,
Peter Zijlstra <peterz@infradead.org>,
Jan Kiszka <jan.kiszka@siemens.com>,
Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
akpm@linux-foundation.org, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
"Feng(Eric) Liu" <eric.e.liu@intel.com>
Subject: Re: [patch 4/4] KVM-trace port to tracepoints
Date: Wed, 23 Jul 2008 06:13:10 -0400 [thread overview]
Message-ID: <20080723101310.GA30309@infradead.org> (raw)
In-Reply-To: <48870329.2080401@qumranet.com>
On Wed, Jul 23, 2008 at 01:08:41PM +0300, Avi Kivity wrote:
> trace_mark() is implement kvmtrace, which is propagated to userspace.
> So while trace_mark() itself is not a userspace interface, one of its
> users is.
>
> It's an unstable interface. But so is dmesg; that's the nature of tracing.
Trace_mark is as stable as any other kernel interface, and
the data you pass through it is as stable as you want it to. In most
cases like kvmtrace or my spu scheduler tracing code the trace data
is directly forwarded through a userspace interface, and that is as
stable as any freeform interface, e.g. as like printk mentioned above.
next prev parent reply other threads:[~2008-07-23 10:14 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-17 15:57 [patch 0/4] Port KVM-trace to tracepoints Mathieu Desnoyers
2008-07-17 15:57 ` [patch 1/4] kvm move VMCS Encodings to system headers Mathieu Desnoyers
2008-07-17 15:57 ` [patch 2/4] kvm move VMCS read " Mathieu Desnoyers
2008-07-17 15:57 ` [patch 3/4] KVM move register read-write " Mathieu Desnoyers
2008-07-17 15:57 ` [patch 4/4] KVM-trace port to tracepoints Mathieu Desnoyers
2008-07-17 16:49 ` Jan Kiszka
2008-07-17 17:28 ` Mathieu Desnoyers
2008-07-22 16:04 ` Jan Kiszka
2008-07-22 18:46 ` Avi Kivity
2008-07-23 7:49 ` Peter Zijlstra
2008-07-23 8:08 ` Avi Kivity
2008-07-23 8:55 ` Peter Zijlstra
2008-07-23 9:32 ` Avi Kivity
2008-07-23 9:53 ` Peter Zijlstra
2008-07-23 13:15 ` Mathieu Desnoyers
2008-07-23 10:03 ` Christoph Hellwig
2008-07-23 10:08 ` Avi Kivity
2008-07-23 10:13 ` Christoph Hellwig [this message]
2008-07-23 13:20 ` Mathieu Desnoyers
2008-07-17 16:52 ` Anthony Liguori
2008-07-17 17:04 ` Mathieu Desnoyers
2008-07-22 18:42 ` [patch 0/4] Port KVM-trace " Avi Kivity
2008-07-22 19:16 ` Frank Ch. Eigler
2008-07-22 19:31 ` Avi Kivity
2008-07-22 19:54 ` Frank Ch. Eigler
2008-07-22 22:12 ` [patch 0/4] Port KVM-trace to tracepoints -> LTTng ? Mathieu Desnoyers
2008-07-27 10:11 ` Avi Kivity
2008-07-28 0:54 ` [RFC] LTTng merge plan Mathieu Desnoyers
2008-07-29 16:18 ` Frank Ch. Eigler
2008-07-29 17:01 ` Mathieu Desnoyers
[not found] ` <20080729211543.GB17097@redhat.com>
2008-07-29 22:41 ` module-placed markers/tracepoints Mathieu Desnoyers
2008-07-29 23:01 ` Frank Ch. Eigler
2008-07-29 23:19 ` Mathieu Desnoyers
2008-07-30 1:40 ` Rusty Russell
2008-07-30 2:27 ` [PATCH] Module : call synchronize_sched() between module exit() and free Mathieu Desnoyers
2008-07-30 3:04 ` Rusty Russell
2008-07-30 4:05 ` Mathieu Desnoyers
2008-07-30 11:40 ` Frank Ch. Eigler
2008-07-30 14:09 ` Mathieu Desnoyers
2008-07-31 0:54 ` Rusty Russell
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