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

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Message-ID: <20160427132002.GO11033@kernel.org>
Date:	Wed, 27 Apr 2016 10:20:02 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	David Ahern <dsahern@...il.com>
Cc:	Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.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

Em Tue, Apr 26, 2016 at 10:45:28AM -0600, David Ahern escreveu:
> On 4/26/16 10:33 AM, Arnaldo Carvalho de Melo wrote:
> >So, for completeness, further testing it to see how far it goes on a 8GB
> >machine I got:
> >
> >[root@...lia ~]# echo 131100 > /proc/sys/kernel/perf_event_max_stack
> >[root@...lia ~]# perf record -g ls
> >Error:
> >The sys_perf_event_open() syscall returned with 12 (Cannot allocate memory) for event (cycles).
> >/bin/dmesg may provide additional information.
> >No CONFIG_PERF_EVENTS=y kernel support configured?
> 
> I thought we fixed up the last line to not display for errors like this.

For most cases, yes.
 
> How about adding ENOMEM case to perf_evsel__open_strerror?

I'll do.

- Arnaldo