From: Peter Zijlstra <peterz@infradead.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: David Ahern <dsahern@gmail.com>,
Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
linux-kernel@vger.kernel.org, jolsa@redhat.com,
Frederic Weisbecker <fweisbec@gmail.com>,
Namhyung Kim <namhyung@kernel.org>,
Mike Galbraith <efault@gmx.de>,
Stephane Eranian <eranian@google.com>
Subject: Re: [PATCH 4/5] perf record: mmap output file - v5
Date: Wed, 13 Nov 2013 13:16:17 +0100 [thread overview]
Message-ID: <20131113121617.GL21461@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20131113115021.GA15469@gmail.com>
On Wed, Nov 13, 2013 at 12:50:21PM +0100, Ingo Molnar wrote:
>
> * Peter Zijlstra <peterz@infradead.org> wrote:
>
> > On Tue, Nov 12, 2013 at 10:11:21PM +0100, Ingo Molnar wrote:
> > >
> > > * David Ahern <dsahern@gmail.com> wrote:
> > >
> > > > > Dunno.. it _should_ all work. Try it and see what it does.. Once the
> > > > > events are bigger than a page things might get 'interesting' though.
> > >
> > > Which could be the case with call-graph recording, right?
> >
> > Not typically, I think we're limiting call graphs to 127 u64, which is
> > ~1k. Maybe you can blow the single page if you also do a large
> > top-of-stack copy for dwarf/unwind nonsense.
>
> What I meant was dwarf style call graph recording:
Ah, one of those things I've never yet used ;-)
> tools/perf/builtin-record.c: const unsigned long default_stack_dump_size = 8192;
>
> Doesn't that mean 8K+ events?
Oh yes.. that's ideal to trigger this.
next prev parent reply other threads:[~2013-11-13 12:16 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-12 14:46 [PATCH 0/5] " David Ahern
2013-11-12 14:46 ` [PATCH 1/5] perf record: Fix segfault with --no-mmap-pages David Ahern
2013-11-12 21:57 ` [tip:perf/urgent] " tip-bot for David Ahern
2013-11-12 14:46 ` [PATCH 2/5] perf tool: Round mmap pages to power 2 - v2 David Ahern
2013-11-12 21:57 ` [tip:perf/urgent] perf evlist: " tip-bot for David Ahern
2013-11-12 14:46 ` [PATCH 3/5] perf tool: Refactor mmap_pages parsing David Ahern
2013-11-12 21:57 ` [tip:perf/urgent] perf evlist: " tip-bot for David Ahern
2013-11-12 14:46 ` [PATCH 4/5] perf record: mmap output file - v5 David Ahern
2013-11-12 14:57 ` Peter Zijlstra
2013-11-12 15:07 ` Arnaldo Carvalho de Melo
2013-11-12 15:19 ` Peter Zijlstra
2013-11-12 15:36 ` David Ahern
2013-11-12 21:11 ` Ingo Molnar
2013-11-13 11:34 ` Peter Zijlstra
2013-11-13 11:50 ` Ingo Molnar
2013-11-13 12:16 ` Peter Zijlstra [this message]
2013-11-13 14:29 ` David Ahern
2013-11-15 16:41 ` David Ahern
2013-11-18 9:01 ` Peter Zijlstra
2013-11-18 9:40 ` Ingo Molnar
2013-11-19 0:24 ` Namhyung Kim
2013-11-19 0:34 ` David Ahern
2013-11-19 1:48 ` Namhyung Kim
2013-11-19 2:02 ` Namhyung Kim
2013-11-19 2:13 ` Namhyung Kim
2013-11-19 2:17 ` David Ahern
2013-11-19 2:30 ` Namhyung Kim
2013-11-19 2:33 ` David Ahern
2013-11-19 2:36 ` Namhyung Kim
2013-11-19 6:58 ` Ingo Molnar
2013-11-19 11:48 ` Peter Zijlstra
2013-11-19 11:49 ` Peter Zijlstra
2013-11-19 13:13 ` Ingo Molnar
2013-11-19 13:45 ` Peter Zijlstra
2013-11-19 15:31 ` Ingo Molnar
2013-11-19 16:09 ` David Ahern
2013-11-19 16:14 ` Ingo Molnar
2013-11-19 12:08 ` Peter Zijlstra
2013-11-19 6:54 ` Ingo Molnar
2013-11-12 14:46 ` [PATCH 5/5] perf record: Handle out of space failures writing data with mmap David Ahern
2013-11-12 21:19 ` Ingo Molnar
2013-11-13 14:33 ` David Ahern
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