linux-kernel - Re: [PATCH/RFC v3] perf core: Allow setting up max frame stack depth via sysctl

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Date:	Wed, 27 Apr 2016 10:27:12 -0600
From:	David Ahern <dsahern@...il.com>
To:	Frederic Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Alexei Starovoitov <ast@...nel.org>,
	He Kuang <hekuang@...wei.com>, Jiri Olsa <jolsa@...hat.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Milian Wolff <milian.wolff@...b.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Stephane Eranian <eranian@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Vince Weaver <vincent.weaver@...ne.edu>,
	Wang Nan <wangnan0@...wei.com>, Zefan Li <lizefan@...wei.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH/RFC v3] perf core: Allow setting up max frame stack depth
 via sysctl

On 4/27/16 10:09 AM, Frederic Weisbecker wrote:
>>> I first thought that this should be a tunable per event instead of a global sysctl
>>
>> Yeah, I'll work on that too.
>
> There is no rush though. The sysfs limit will probably be enough for most users. Unless
> someone requested it?
>

I have. I spent time last winter (2015) looking into how to do it. The 
userspace syntax was more of a pain than passing the parameters to the 
kernel side as the intent is to specify N kernel frames and M user frames.