linux-kernel - Re: [PATCH 5/8] perf tools: Get precise

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Message-ID: <20190305161319.GC17272@tassilo.jf.intel.com>
Date:   Tue, 5 Mar 2019 08:13:19 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Jonas Rabenstein <jonas.rabenstein@...dium.uni-erlangen.de>,
        Nageswara R Sastry <nasastry@...ibm.com>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Subject: Re: [PATCH 5/8] perf tools: Get precise_ip from the pmu config

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

The previous method handled it by event.

-Andi