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

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Date:	Tue, 8 Mar 2016 17:48:59 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Wang Nan <wangnan0@...wei.com>, Ingo Molnar <mingo@...hat.com>,
	LKML <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


* Ingo Molnar <mingo@...nel.org> wrote:

> It only had a couple of seconds of runtime:
> 
>  49652 mingo     20   0 1434276  52144  11344 S   0.0  0.0   0:00.54 syz-manager                                                                                                      
>  49661 mingo     20   0 2196672  43948  10448 S   0.0  0.0   0:05.59 syz-fuzzer                 

Ah, so it appears to making some progress:

 49652 mingo     20   0 1581740  47600  11344 S   0.0  0.0   0:00.58 syz-manager                                                                                                      
 49661 mingo     20   0 2204868  43720  10448 S   0.0  0.0   0:07.49 syz-fuzzer                             

 49652 mingo     20   0 1598132  31512  11344 S   0.0  0.0   0:00.61 syz-manager                                                                                                      
 49661 mingo     20   0 2204868  44252  10448 S   0.0  0.0   0:09.09 syz-fuzzer               

but only about +1 second runtime added every minute or so. Is that expected?

There's no progress mark anywhere suggesting that the tool thinks it is going 
fine. You might want to emit periodic (once a minute or so) 'I am still OK!' 
messages or so.

Thanks,

	Ingo