From: Peter Zijlstra <peterz@infradead.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>,
Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>,
Alexei Starovoitov <alexei.starovoitov@gmail.com>,
David Ahern <dsahern@gmail.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Ingo Molnar <mingo@kernel.org>,
Adrian Hunter <adrian.hunter@intel.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Alexei Starovoitov <ast@kernel.org>,
He Kuang <hekuang@huawei.com>, Jiri Olsa <jolsa@redhat.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Milian Wolff <milian.wolff@kdab.com>,
Namhyung Kim <namhyung@kernel.org>,
Stephane Eranian <eranian@google.com>,
Thomas Gleixner <tglx@linutronix.de>,
Vince Weaver <vincent.weaver@maine.edu>,
Wang Nan <wangnan0@huawei.com>, Zefan Li <lizefan@huawei.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH/RFC v3] perf core: Allow setting up max frame stack depth via sysctl
Date: Tue, 26 Apr 2016 23:55:36 +0200 [thread overview]
Message-ID: <20160426215536.GP3430@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20160426210500.GK11033@kernel.org>
On Tue, Apr 26, 2016 at 06:05:00PM -0300, Arnaldo Carvalho de Melo wrote:
> > I started with max depth = 512, and even that was still truncated, and
> > had to profile again at 1024 to capture the full stacks. Seems to
^^^^^^
> > generally match the flame graph I generated with V1, which made me
> > want to check that I'm running the new patch, and am:
> >
> > # grep six_hundred_forty_kb /proc/kallsyms
> > ffffffff81c431e0 d six_hundred_forty_kb
> >
> > I was mucking around and was able to get "corrupted callchain.
> > skipping..." errors, but these look to be expected -- that was
>
> Yeah, thanks for testing!
>
> And since you talked about userspace without frame pointers, have you
> played with '--call-graph lbr'?
That seems to be at odds with his requirements; he needs 1024 entries to
capture full stacks, LBR is limited to 16/32 or so entries. That's 2
orders of magnitude difference.
next prev parent reply other threads:[~2016-04-26 21:56 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-20 22:47 [PATCH/RFC] perf core: Allow setting up max frame stack depth via sysctl Arnaldo Carvalho de Melo
2016-04-20 23:04 ` Alexei Starovoitov
2016-04-22 20:52 ` [PATCH/RFC v2] " Arnaldo Carvalho de Melo
2016-04-22 21:37 ` Alexei Starovoitov
2016-04-22 22:05 ` David Ahern
2016-04-22 22:18 ` Alexei Starovoitov
2016-04-25 16:14 ` Arnaldo Carvalho de Melo
2016-04-25 16:27 ` Arnaldo Carvalho de Melo
2016-04-25 19:22 ` Arnaldo Carvalho de Melo
2016-04-25 20:06 ` Alexei Starovoitov
2016-04-25 20:17 ` Arnaldo Carvalho de Melo
2016-04-25 21:59 ` Alexei Starovoitov
2016-04-25 23:41 ` Arnaldo Carvalho de Melo
2016-04-26 0:07 ` Alexei Starovoitov
2016-04-26 0:29 ` [PATCH/RFC v3] " Arnaldo Carvalho de Melo
2016-04-26 0:44 ` Alexei Starovoitov
2016-04-26 0:47 ` Arnaldo Carvalho de Melo
2016-04-26 0:49 ` Brendan Gregg
2016-04-26 16:33 ` Arnaldo Carvalho de Melo
2016-04-26 16:45 ` David Ahern
2016-04-27 13:20 ` Arnaldo Carvalho de Melo
2016-04-26 20:02 ` Brendan Gregg
2016-04-26 21:05 ` Arnaldo Carvalho de Melo
2016-04-26 21:55 ` Peter Zijlstra [this message]
2016-04-27 12:53 ` Arnaldo Carvalho de Melo
2016-04-26 21:58 ` Brendan Gregg
2016-04-26 22:10 ` Peter Zijlstra
2016-04-27 12:56 ` Arnaldo Carvalho de Melo
2016-04-26 21:58 ` Frederic Weisbecker
2016-04-27 12:53 ` Arnaldo Carvalho de Melo
2016-04-27 16:09 ` Frederic Weisbecker
2016-04-27 16:27 ` David Ahern
2016-04-27 15:39 ` [tip:perf/core] " tip-bot for Arnaldo Carvalho de Melo
2016-04-20 23:10 ` [PATCH/RFC] " David Ahern
2016-04-21 0:18 ` Arnaldo Carvalho de Melo
2016-04-21 10:48 ` Peter Zijlstra
2016-04-21 15:17 ` Arnaldo Carvalho de Melo
2016-04-21 15:42 ` Arnaldo Carvalho de Melo
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