From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>,
Pierre Tardy <tardyp@gmail.com>, Ingo Molnar <mingo@elte.hu>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Tom Zanussi <tzanussi@gmail.com>,
Paul Mackerras <paulus@samba.org>,
linux-kernel@vger.kernel.org, arjan@infradead.org,
ziga.mahkovec@gmail.com, davem <davem@davemloft.net>
Subject: Re: Perf and ftrace [was Re: PyTimechart]
Date: Wed, 12 May 2010 14:04:38 -0400 [thread overview]
Message-ID: <20100512180438.GE15953@Krystal> (raw)
In-Reply-To: <1273687212.1626.147.camel@laptop>
* Peter Zijlstra (peterz@infradead.org) wrote:
> On Wed, 2010-05-12 at 13:53 -0400, Mathieu Desnoyers wrote:
> >
> > Would you be fine with an alternative implementation and API that support both
> > mmap() and splice(), without any need to swap pages ?
>
> Sure, what did you have in mind?
>
> You basically give you page to splice, never to see it again, you'd need
> to fill that hole in your buffer again.
>
Can't we keep multiple references to each page ? (shared page) so it's still in
the buffer, also accessed by mmap(), and in addition accessed by splice.
Mathieu
--
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
next prev parent reply other threads:[~2010-05-12 18:04 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-11 21:10 [RFC] PyTimechart Pierre Tardy
2010-05-11 21:36 ` Frederic Weisbecker
2010-05-12 13:37 ` Pierre Tardy
2010-05-12 14:48 ` Frederic Weisbecker
2010-05-12 15:36 ` Steven Rostedt
2010-05-12 16:46 ` Perf and ftrace [was Re: PyTimechart] Frederic Weisbecker
2010-05-12 17:00 ` Peter Zijlstra
2010-05-12 17:07 ` Mathieu Desnoyers
2010-05-12 17:47 ` Peter Zijlstra
2010-05-12 17:53 ` Mathieu Desnoyers
2010-05-12 18:00 ` Peter Zijlstra
2010-05-12 18:04 ` Mathieu Desnoyers [this message]
2010-05-12 18:08 ` Peter Zijlstra
2010-05-12 18:37 ` Mathieu Desnoyers
2010-05-12 18:46 ` Steven Rostedt
2010-05-12 20:27 ` Mathieu Desnoyers
2010-05-12 22:21 ` Steven Rostedt
2010-05-13 13:20 ` Mathieu Desnoyers
2010-05-13 15:42 ` Steven Rostedt
2010-05-13 16:31 ` Mathieu Desnoyers
2010-05-13 16:46 ` Steven Rostedt
2010-05-13 17:10 ` Mathieu Desnoyers
2010-05-13 18:33 ` Steven Rostedt
2010-05-14 7:53 ` Peter Zijlstra
2010-05-12 18:49 ` Peter Zijlstra
2010-05-12 18:51 ` Mathieu Desnoyers
2010-05-12 19:01 ` Peter Zijlstra
2010-05-12 20:52 ` Mathieu Desnoyers
2010-05-12 17:11 ` Ingo Molnar
2010-05-12 16:59 ` [RFC] PyTimechart Ingo Molnar
2010-05-12 17:15 ` Steven Rostedt
2010-05-12 18:23 ` Ingo Molnar
2010-05-12 17:13 ` Pierre Tardy
2010-05-13 15:02 ` Arnaldo Carvalho de Melo
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