linux-kernel - Re: [PATCH 1/4] perf core: Introduce new ioctl options to pause and resume ring buffer

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Message-ID: <20160330064612.GR3408@twins.programming.kicks-ass.net>
Date:	Wed, 30 Mar 2016 08:46:12 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Wangnan (F)" <wangnan0@...wei.com>
Cc:	Alexei Starovoitov <ast@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	linux-kernel@...r.kernel.org,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	He Kuang <hekuang@...wei.com>, Jiri Olsa <jolsa@...nel.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>, pi3orama@....com,
	Zefan Li <lizefan@...wei.com>
Subject: Re: [PATCH 1/4] perf core: Introduce new ioctl options to pause and
 resume ring buffer

On Wed, Mar 30, 2016 at 09:57:02AM +0800, Wangnan (F) wrote:
> 
> 
> On 2016/3/29 20:54, Peter Zijlstra wrote:
> >On Mon, Mar 28, 2016 at 06:41:29AM +0000, Wang Nan wrote:
> >>Add new ioctl() to pause/resume ring-buffer output.
> >>
> >>In some situations we want to read from ring buffer only when we
> >>ensure nothing can write to the ring buffer during reading. Without
> >>this patch we have to turn off all events attached to this ring buffer
> >>to achieve this.
> >>
> >>This patch is for supporting overwrite ring buffer. Following
> >>commits will introduce new methods support reading from overwrite ring
> >>buffer. Before reading, caller must ensure the ring buffer is frozen, or
> >>the reading is unreliable.
> >>
> >>Signed-off-by: Wang Nan <wangnan0@...wei.com>
> >I made the below changes.
> 
> Can I add your SOB when I resend it?

No need, I've got it.