From: Jiri Olsa <jolsa@redhat.com>
To: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
lkml <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>,
Nageswara R Sastry <nasastry@in.ibm.com>,
Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Subject: Re: [PATCHv2 5/8] perf tools: Get precise_ip from the pmu config
Date: Thu, 7 Mar 2019 23:32:46 +0100 [thread overview]
Message-ID: <20190307223246.GA16788@krava> (raw)
In-Reply-To: <20190307165123.GE7535@tassilo.jf.intel.com>
On Thu, Mar 07, 2019 at 08:51:23AM -0800, Andi Kleen wrote:
> On Thu, Mar 07, 2019 at 04:35:00PM +0100, Jiri Olsa wrote:
> > On Tue, Mar 05, 2019 at 08:40:17AM -0800, Andi Kleen wrote:
> > > On Tue, Mar 05, 2019 at 05:28:54PM +0100, Jiri Olsa wrote:
> > > > On Tue, Mar 05, 2019 at 08:13:19AM -0800, Andi Kleen wrote:
> > > > > On Tue, Mar 05, 2019 at 04:25:33PM +0100, Jiri Olsa wrote:
> > > > > > Getting precise_ip field from the perf_pmu::max_precise
> > > > > > config read from sysfs. If it's not available falling
> > > > > > back to current detection function.
> > > > >
> > > > > max_precise depends on the event. This won't work for all
> > > > > events. For example only instructions and cycles support
> > > > > ppp
> > > >
> > > > I'm getting precise_ip=3 on mem-* events as well, that's why I
> > > > was fixing this.. now it's not working for any event
> > >
> > > I don't think it means anything for mem-*
> > >
> > > There's some support for it on Goldmont plus for other events,
> > > but it doesn't support mem-*. On big core it's only
> > > for instructions and cycles, all implemented with the same
> > > event. All other PEBS events only have two levels
> > > switching between the two IPs.
> >
> > ok, so how about this, it's the change I posted merged with the patch
>
> Still seems like a hack. Even though I don't know of a case that
> would break now. But it would be better to have the precise probing
> in the open retry loop, instead of trying to reinvent it here.
right, I guess we could just set precise_ip hard to 3 for :P
and add fallback part for the precise_ip in perf_evsel__open
jirka
next prev parent reply other threads:[~2019-03-07 22:32 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-05 15:25 [PATCH 0/8] perf tools: Assorted fixes Jiri Olsa
2019-03-05 15:25 ` [PATCH 1/8] perf c2c: Fix c2c report for empty numa node Jiri Olsa
2019-03-09 20:05 ` [tip:perf/urgent] " tip-bot for Jiri Olsa
2019-03-05 15:25 ` [PATCH 2/8] perf tools: Add error path into hist_entry__init Jiri Olsa
2019-03-09 20:06 ` [tip:perf/urgent] perf hist: " tip-bot for Jiri Olsa
2019-03-05 15:25 ` [PATCH 3/8] perf hist: Fix memory leak of srcline Jiri Olsa
2019-03-09 20:07 ` [tip:perf/urgent] " tip-bot for Jiri Olsa
2019-03-05 15:25 ` [PATCH 4/8] perf tools: Read and store caps/max_precise in perf_pmu Jiri Olsa
2019-03-09 20:07 ` [tip:perf/urgent] " tip-bot for Jiri Olsa
2019-03-05 15:25 ` [PATCH 5/8] perf tools: Get precise_ip from the pmu config Jiri Olsa
2019-03-05 16:13 ` Andi Kleen
2019-03-05 16:28 ` Jiri Olsa
2019-03-05 16:40 ` Andi Kleen
2019-03-07 15:35 ` [PATCHv2 " Jiri Olsa
2019-03-07 16:51 ` Andi Kleen
2019-03-07 22:32 ` Jiri Olsa [this message]
2019-03-14 14:01 ` Jiri Olsa
2019-03-14 15:49 ` Andi Kleen
2019-03-15 12:15 ` [PATCH] perf tools: Move precise_ip detection into perf_evsel__open Jiri Olsa
2019-03-15 14:05 ` Andi Kleen
2019-03-15 14:35 ` Arnaldo Carvalho de Melo
2019-03-15 14:52 ` Jiri Olsa
2019-03-23 15:04 ` Jiri Olsa
2019-03-25 14:53 ` Arnaldo Carvalho de Melo
2019-03-05 15:25 ` [PATCH 6/8] perf tools: Probe for precise_ip with simple attr Jiri Olsa
2019-03-09 20:08 ` [tip:perf/urgent] perf evsel: " tip-bot for Jiri Olsa
2019-03-05 15:25 ` [PATCH 7/8] perf tools: Fix double free in perf_data__close Jiri Olsa
2019-03-09 20:09 ` [tip:perf/urgent] perf session: " tip-bot for Jiri Olsa
2019-03-05 15:25 ` [PATCH 8/8] perf tools: Force perf_data__open|close zero data->file.path Jiri Olsa
2019-03-09 20:09 ` [tip:perf/urgent] perf data: " tip-bot for Jiri Olsa
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