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

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Message-ID: <20160421001828.GY3677@kernel.org>
Date:	Wed, 20 Apr 2016 21:18:28 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	David Ahern <dsahern@...il.com>
Cc:	Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	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] perf core: Allow setting up max frame stack depth
 via sysctl

Em Wed, Apr 20, 2016 at 05:10:17PM -0600, David Ahern escreveu:
> On 4/20/16 4:47 PM, Arnaldo Carvalho de Melo wrote:
> >   # echo 256 > /proc/sys/kernel/perf_event_max_stack
> >   # cat /proc/sys/kernel/perf_event_max_stack
> >   256
 
> I would love to see something like this go in. Right now I have to recompile
> the kernel because I want a lower max count.
 
> In the past we talked about about making this part of the attribute with
> separate controls for both kernel stack and userspace stack. Have you given
> up on that option?

Nope, I'll try to work on that too, I even mentioned it above, the part
"one per event remains to be done".

- Arnaldo