linux-kernel - Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer

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Message-ID: <20160308134454.GY6344@twins.programming.kicks-ass.net>
Date:	Tue, 8 Mar 2016 14:44:54 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	mingo@...hat.com, linux-kernel@...r.kernel.org,
	He Kuang <hekuang@...wei.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Zefan Li <lizefan@...wei.com>, pi3orama@....com
Subject: Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer

On Mon, Mar 07, 2016 at 03:50:14AM +0000, Wang Nan wrote:
> This patch set has been posted multiple times (with and without
> corresponding 'perf tool' patches), and doesn't receive further
> comment. I think it should be okay to merge them into mainline.
> There are many perf's improvement depend on it. However, Peter
> is not responsive after I fixed some problems he pointed out.
> 
> Introduces 'write_backward' into perf_event_attr, allows kernel
> writing the ring buffer from the end of it. This feature allows
> extracting data from overwritable ring buffer.
> 
> Wang Nan (5):
>   perf core: Introduce new ioctl options to pause and resume ring buffer
>   perf core: Set event's default overflow_handler
>   perf core: Prepare writing into ring buffer from end
>   perf core: Add backward attribute to perf event
>   perf core: Reduce perf event output overhead by new overflow handler

perf kernel features are currently on hold until I can manage to run a
fuzzer for more than a few minutes without my machine having a seizure.