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From: Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>
To: Jiri Olsa <jolsa@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>, Jiri Olsa <jolsa@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: [PATCH] perf tools: Move precise_ip detection into perf_evsel__open
Date: Mon, 25 Mar 2019 11:53:33 -0300
Message-ID: <20190325145333.GA1486@kernel.org> (raw)
In-Reply-To: <20190323150422.GA22122@krava>

Em Sat, Mar 23, 2019 at 04:04:22PM +0100, Jiri Olsa escreveu:
> On Fri, Mar 15, 2019 at 03:52:25PM +0100, Jiri Olsa wrote:
> > On Fri, Mar 15, 2019 at 11:35:04AM -0300, Arnaldo Carvalho de Melo wrote:
> > > The perf_evsel__open() code is already complex with that fallback
> > > mechanism, this is just one more way of fallbacking when asking the
> > > kernel for something that may fail.

> > > In fact what happens if the precise_ip that is being asked _is_
> > > supported but sys_perf_event_open() fails because some other
> > > perf_event_attr attribute that is set is not supported? 

> > it's outside the scope of standard feature fallback code,
> > so we will try it for any possible fallback variant, so:

> > we will try all possible precise_ip (3,2,1,0) and they will
> > all fail because of the unsupported attribute - so we will
> > restore the precise_ip back and continue in standard fallback
> > code that will eventualy switch that attribute off
 
> > > I see, it gets it back restored to what the user asked so that the
> > > standard fallback is tried, ok, I'll apply with just the rename for this
> > > function,
 
> ping, there's rebased version in my perf/fixes branch

Thanks, applied.

- Arnaldo

  reply index

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
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 [this message]
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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