From: "Wangnan (F)" <wangnan0@huawei.com>
To: Peter Zijlstra <peterz@infradead.org>,
Yunlong Song <yunlong.song@huawei.com>
Cc: <paulus@samba.org>, <mingo@redhat.com>, <acme@kernel.org>,
<linux-kernel@vger.kernel.org>, <namhyung@kernel.org>,
<ast@kernel.org>, <masami.hiramatsu.pt@hitachi.com>,
<kan.liang@intel.com>, <adrian.hunter@intel.com>,
<jolsa@kernel.org>, <dsahern@gmail.com>, <bp@alien8.de>,
<jean.pihet@linaro.org>, <rric@kernel.org>, <xiakaixu@huawei.com>,
<hekuang@huawei.com>
Subject: Re: [PATCH] perf record: Add snapshot mode support for perf's regular events
Date: Wed, 2 Dec 2015 16:25:33 +0800 [thread overview]
Message-ID: <565EAAFD.3000103@huawei.com> (raw)
In-Reply-To: <20151125092728.GZ17308@twins.programming.kicks-ass.net>
Hi Peter,
On 2015/11/25 17:27, Peter Zijlstra wrote:
> On Tue, Nov 24, 2015 at 10:00:31PM +0800, Yunlong Song wrote:
>> In our patch, we create and maintain a user space ring buffer to store
>> perf's tracing info, instead of directly writing to perf.data file as
>> before. In snapshot mode, only a SIGUSR2 signal can trigger perf to dump
>> the tracing info currently stored in the user space ring buffer to
>> perf.data file.
> I would very much like to first fix the perf overwrite mode: see
> lkml.kernel.org/r/20151023151205.GW11639@twins.programming.kicks-ass.net
I have an idea on this problem that, is it possible to
put the size of an event at the end of it when we working
on overwrite mode? So we can backtrack every events without
too much change to ring buffer?
Thank you.
next prev parent reply other threads:[~2015-12-02 8:27 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-24 14:00 [PATCH] perf record: Add snapshot mode support for perf's regular events Yunlong Song
2015-11-24 14:00 ` Yunlong Song
2015-11-24 14:30 ` Arnaldo Carvalho de Melo
2015-11-25 12:44 ` Yunlong Song
2015-11-24 15:06 ` David Ahern
2015-11-24 15:20 ` Arnaldo Carvalho de Melo
2015-11-24 15:24 ` David Ahern
2015-11-24 15:40 ` Arnaldo Carvalho de Melo
2015-11-24 16:16 ` David Ahern
2015-11-25 3:50 ` Wangnan (F)
2015-11-25 5:06 ` David Ahern
2015-11-25 7:22 ` Adrian Hunter
2015-11-25 7:47 ` Wangnan (F)
2015-11-25 8:27 ` Adrian Hunter
2015-11-25 8:43 ` Wangnan (F)
2015-11-25 9:05 ` Adrian Hunter
2015-11-25 7:50 ` Yunlong Song
2015-11-25 9:27 ` Peter Zijlstra
2015-11-25 9:44 ` Wangnan (F)
2015-11-25 12:20 ` Peter Zijlstra
2015-11-25 12:54 ` Wangnan (F)
2015-11-26 9:19 ` Ingo Molnar
2015-11-26 9:24 ` Wangnan (F)
2015-11-26 9:27 ` Ingo Molnar
2015-11-26 9:40 ` Ingo Molnar
2015-11-26 9:57 ` Ingo Molnar
2015-12-02 8:25 ` Wangnan (F) [this message]
2015-12-02 13:38 ` [RFC PATCH] perf/core: Put size of a sample at the end of it Wang Nan
2015-12-03 10:08 ` Peter Zijlstra
2015-12-03 10:31 ` Wangnan (F)
2015-12-07 13:28 ` [RFC PATCH v2 0/3] perf core/perf tools: Utilizing overwrite ring buffer Wang Nan
2015-12-07 13:28 ` [RFC PATCH v2 1/3] perf/core: Put size of a sample at the end of it Wang Nan
2015-12-07 13:28 ` [RFC PATCH v2 2/3] perf tools: Enable overwrite settings Wang Nan
2015-12-07 13:28 ` [RFC PATCH v2 3/3] perf record: Find tail pointer through size at end of event Wang Nan
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