From: Ingo Molnar <mingo@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>,
linux-kernel@vger.kernel.org,
Arjan van de Ven <arjan@infradead.org>,
David Ahern <dsahern@gmail.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Mike Galbraith <efault@gmx.de>, Namhyung Kim <namhyung@gmail.com>,
Paul Mackerras <paulus@samba.org>,
Peter Zijlstra <peterz@infradead.org>,
Stephane Eranian <eranian@google.com>
Subject: Re: [GIT PULL 0/8] Annotation weekly ponies delivery
Date: Mon, 14 May 2012 09:05:07 +0200 [thread overview]
Message-ID: <20120514070507.GB27980@gmail.com> (raw)
In-Reply-To: <CA+55aFzGAokE5htNFhkoRxT5bK1_5=uofkC5xZipTtiawSh_hA@mail.gmail.com>
* Linus Torvalds <torvalds@linux-foundation.org> wrote:
> On Sat, May 12, 2012 at 2:25 PM, Arnaldo Carvalho de Melo
> <acme@infradead.org> wrote:
> >
> > Didn't notice it, but then I'm not updating the kernel that frequently,
> > will check on this Sandy Bridge nobo (i7-2920XM).
>
> I think SNB has problems with PEBS and cycles anyway. I have a
> westmere machine that I use for profiling for that reason.
I have a pre-westmere Nehalem that I use most for perf testing -
that one appears to be working well both with default cycles and
with cycles:pp. Will test on a Westmere.
btw., Arnaldo, could we make cycles:pp the default event on perf
record and perf top? We have the new AMD IBS code in perf/core
queued up for v3.5, which is roughly equivalent to cycles:p on
Intel CPUs, so if we standardize on cycles:pp we'll get improved
skidless (and on Intel pre-SB CPUs, precise) profiling output by
default.
While at it I'd also suggest increasing the default sampling
frequency, from 1000 Hz per CPU to at least 4Khz auto-freq or so
- this should work well all across the board I think. CPUs are
getting faster and command/app run times are getting shorter,
1Khz is a bit low IMO.
Thanks,
Ingo
next prev parent reply other threads:[~2012-05-14 7:05 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-12 19:52 [GIT PULL 0/8] Annotation weekly ponies delivery Arnaldo Carvalho de Melo
2012-05-12 19:53 ` [PATCH 1/8] perf annotate: Use raw form for register indirect call instructions Arnaldo Carvalho de Melo
2012-05-12 19:53 ` [PATCH 2/8] perf annotate: Resolve symbols using objdump comment Arnaldo Carvalho de Melo
2012-05-12 19:53 ` [PATCH 3/8] perf annotate: Resolve symbols using objdump comment for single op ins Arnaldo Carvalho de Melo
2012-05-12 19:53 ` [PATCH 4/8] perf annotate: Augment lock instruction output Arnaldo Carvalho de Melo
2012-05-12 19:53 ` [PATCH 5/8] perf annotate: Introduce ->free() method in ins_ops Arnaldo Carvalho de Melo
2012-05-12 19:53 ` [PATCH 6/8] perf annotate browser: Count the numbers of jump sources to a target Arnaldo Carvalho de Melo
2012-05-12 19:53 ` [PATCH 7/8] perf annotate browser: Show 'jumpy' functions Arnaldo Carvalho de Melo
2012-05-12 19:53 ` [PATCH 8/8] perf annotate browser: Add key bindings help window Arnaldo Carvalho de Melo
2012-05-12 20:40 ` [GIT PULL 0/8] Annotation weekly ponies delivery Linus Torvalds
2012-05-12 21:25 ` Arnaldo Carvalho de Melo
2012-05-12 22:29 ` Linus Torvalds
2012-05-14 7:05 ` Ingo Molnar [this message]
2012-05-14 11:13 ` Peter Zijlstra
2012-05-14 11:55 ` Ingo Molnar
2012-05-14 15:06 ` Namhyung Kim
2012-05-15 4:48 ` Namhyung Kim
2012-05-15 10:32 ` Peter Zijlstra
2012-05-15 14:44 ` Namhyung Kim
2012-05-15 17:07 ` Peter Zijlstra
2012-05-16 5:57 ` Namhyung Kim
2012-05-16 8:19 ` Namhyung Kim
2012-05-17 0:13 ` Namhyung Kim
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