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From: Vince Weaver <vince@deater.net>
To: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Jiri Olsa <jolsa@kernel.org>, lkml <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>, Andi Kleen <andi@firstfloor.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>
Subject: Re: [PATCH] perf/x86: Reject non sampling events with precise_ip
Date: Tue, 3 Jan 2017 17:06:41 -0500 (EST)	[thread overview]
Message-ID: <alpine.DEB.2.11.1701031704140.3940@pianoman.cluster.toy> (raw)
In-Reply-To: <20170103142454.GA26251@krava>

On Tue, 3 Jan 2017, Jiri Olsa wrote:
> On Tue, Jan 03, 2017 at 10:40:59AM +0100, Peter Zijlstra wrote:
> > 
> > I think we should reject non sampling pebs events, as you say they make
> > no sense what so ever.
> 
> ook, attached
> 

you can use the PEBS events to gather aggregate stats though and they 
seem roughly right.  Are they truly meaningless?

I had misremembered that they might not have the determinism problems of 
regular events (turns out that's wrong).  They oddly seem to be worse in 
some limited tests I did.

So I guess nothing will be lost if they're disabled.

Vince

  reply	other threads:[~2017-01-03 22:06 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-12-28 13:31 [PATCH 0/4] perf: Fuzzer fixes Jiri Olsa
2016-12-28 13:31 ` [PATCH 1/4] perf/x86/intel: Account interrupts for PEBS errors Jiri Olsa
2017-01-14 12:29   ` [tip:perf/urgent] " tip-bot for Jiri Olsa
2016-12-28 13:31 ` [PATCH 2/4] perf/x86: Fix period for non sampling events Jiri Olsa
2017-01-03  9:40   ` Peter Zijlstra
2017-01-03 14:24     ` [PATCH] perf/x86: Reject non sampling events with precise_ip Jiri Olsa
2017-01-03 22:06       ` Vince Weaver [this message]
2017-01-14 12:29       ` [tip:perf/urgent] " tip-bot for Jiri Olsa
2017-01-03 15:09   ` [PATCH 2/4] perf/x86: Fix period for non sampling events Peter Zijlstra
2017-01-03 15:26     ` Jiri Olsa
2016-12-28 13:31 ` [PATCH 3/4] perf: Add perf_event_overflow_throttle function Jiri Olsa
2016-12-28 13:31 ` [PATCH 4/4] perf/x86/intel: Throttle PEBS events only from pmi Jiri Olsa
2017-01-03 13:45   ` Peter Zijlstra
2017-01-24 16:41   ` Peter Zijlstra
2017-01-25 13:02     ` Jiri Olsa
2017-01-25 13:02     ` Jiri Olsa

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