From: Peter Zijlstra <peterz@infradead.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>,
linux-kernel@vger.kernel.org,
Corey Ashford <cjashfor@linux.vnet.ibm.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Ingo Molnar <mingo@elte.hu>, Namhyung Kim <namhyung@kernel.org>,
Paul Mackerras <paulus@samba.org>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Andi Kleen <ak@linux.intel.com>, David Ahern <dsahern@gmail.com>,
Stephane Eranian <eranian@google.com>
Subject: Re: [PATCH 0/9] perf: Adding better precise_ip field handling
Date: Fri, 10 May 2013 12:34:36 +0200 [thread overview]
Message-ID: <20130510103436.GC31235@dyad.programming.kicks-ass.net> (raw)
In-Reply-To: <20130510103112.GA18755@gmail.com>
On Fri, May 10, 2013 at 12:31:12PM +0200, Ingo Molnar wrote:
> PERF_COUNT_HW_CPU_CYCLES_PRECISE is not a vague request at all: it means
> 'get me the most precise cycles profiling available on this system'.
And how will you interpret the results? Do you know to manually adjust for skid
or will you assume the results 'correct'?
I see such a feature only causing confusion; I told it to be precise, therefore
this register op after the memory load really is the more expensive thing.
People generally don't volunteer to think, you have to force them to -- even if
that makes them complain.
next prev parent reply other threads:[~2013-05-10 10:36 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-09 13:32 [PATCH 0/9] perf: Adding better precise_ip field handling Jiri Olsa
2013-05-09 13:32 ` [PATCH 1/9] perf x86: Add precise sysfs cpu pmu attribute Jiri Olsa
2013-05-09 13:32 ` [PATCH 2/9] perf tools: Add precise object to interface sysfs precise Jiri Olsa
2013-05-10 1:34 ` Namhyung Kim
2013-05-10 9:06 ` Jiri Olsa
2013-05-09 13:32 ` [PATCH 3/9] perf tests: Add precise event automated test Jiri Olsa
2013-05-09 13:32 ` [PATCH 4/9] perf tools: Add a precise event qualifier Jiri Olsa
2013-05-10 1:43 ` Namhyung Kim
2013-05-10 9:10 ` Jiri Olsa
2013-05-09 13:32 ` [PATCH 5/9] perf tools: Set maximum precise value for event 'p' modifier Jiri Olsa
2013-05-09 19:43 ` David Ahern
2013-05-10 9:12 ` Jiri Olsa
2013-05-10 1:53 ` Namhyung Kim
2013-05-10 9:16 ` Jiri Olsa
2013-05-09 13:32 ` [PATCH 6/9] perf tools: Set maximum precise value for 'precise' term Jiri Olsa
2013-05-09 13:32 ` [PATCH 7/9] perf tests: Add automated precise term test Jiri Olsa
2013-05-09 13:32 ` [PATCH 8/9] perf: Document the ABI for 'precise' sysfs attribute Jiri Olsa
2013-05-10 1:57 ` Namhyung Kim
2013-05-09 13:32 ` [PATCH 9/9] perf: Document the ABI for 'rdpmc' " Jiri Olsa
2013-05-09 15:07 ` [PATCH 0/9] perf: Adding better precise_ip field handling Peter Zijlstra
2013-05-09 15:20 ` Jiri Olsa
2013-05-10 9:27 ` Peter Zijlstra
2013-05-10 9:40 ` Jiri Olsa
2013-05-10 9:53 ` Peter Zijlstra
2013-05-10 10:18 ` Ingo Molnar
2013-05-10 10:22 ` Peter Zijlstra
2013-05-10 10:31 ` Ingo Molnar
2013-05-10 10:34 ` Peter Zijlstra [this message]
2013-05-10 10:55 ` Ingo Molnar
2013-05-10 11:27 ` Peter Zijlstra
2013-05-11 7:50 ` Ingo Molnar
2013-05-13 9:36 ` Peter Zijlstra
2013-05-13 19:43 ` Ingo Molnar
2013-05-14 7:22 ` Peter Zijlstra
2013-05-14 8:37 ` Ingo Molnar
2013-05-14 8:36 ` Gleb Natapov
2013-05-15 13:27 ` Stephane Eranian
2013-05-28 9:54 ` Ingo Molnar
2013-05-10 9:29 ` Peter Zijlstra
2013-05-10 9:43 ` Jiri Olsa
-- strict thread matches above, loose matches on Subject: below --
2013-01-26 17:27 Jiri Olsa
2013-01-26 18:53 ` Jiri Olsa
2013-01-27 12:41 ` Ingo Molnar
2013-01-27 12:57 ` Jiri Olsa
2013-01-27 13:02 ` Ingo Molnar
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